AMPH Amphastar Pharmaceuticals, Inc.
XNAS 26.20 DelayedStock quote, options chain, IV rank, technicals, AI analysis, and institutional ownership. Iron condor setups Expected move IV rank history Fibonacci levels Insider trading
Market data may be delayed, incomplete, or inaccurate. Not a recommendation to buy, sell, or hold any security. Verify quotes with your broker before trading. See Terms §17.
AMPH
$26.20
—
Key stats
$26.20
- 52-Week Range
- $16.64 – $29.52
- YTD
- -0.98%
- IV Rank (30D)
- 42.59
- Straddle Price
- $4.57
- P/C Vol Ratio
- 0.08
- Market Cap
- $1.1B
- Open
- $25.69
- Day Range
- $25.51 – $26.35
- Volume
- 390,205
- Prev Close
- $25.94
Fair Value
MODEL: LONG
A blended fair-value estimate combining up to six valuation methods. Each method is weighted by how well it fits the company — DCF down-weights for unprofitable names; DDM only fires for steady dividend payers; comparables down-weight when peer multiples disagree.
- DCF (quality-aware) — projects free cash flow with a horizon that scales to business quality. True compounders (quality 6/6) get 10 years explicit + 10 years fade before terminal; cyclical/struggling names (quality 0-1) get a 5-year terminal cliff. Quality is scored from ROE, gross margin, growth, FCF margin, debt load, and FCF consistency — the same factors that drive market premium for compounders.
- Market-Implied Growth (in Model Inputs) — reverse-DCF that answers "what growth rate is the market pricing in?". Lets you sanity-check the deviation: if implied growth is plausible for the business, the model's bearish flag may be wrong; if implausible, the market may be over-extrapolating.
- DDM (Gordon Growth Dividend Model) — values the stream of future dividends. Only used when trailing yield ≥ 2% and dividend payments are stable — below that the dividend is a token payout and Gordon (which values only the dividend stream) systematically underprices growth names, so those route to DCF + comparables + market anchor instead.
- P/E, EV/EBITDA, P/B, P/S — applies the peer-group median multiple to this company's per-share metric. Peers come from the same set as the "Related symbols" card. Earnings/sales metrics are forward-tilted by the company's recent revenue growth (capped at 25%) so they're comparable to peers' growth-embedded multiples — mimics how analysts use NTM rather than TTM. Per-multiple weights are biased by company quality (e.g. P/B down-weighted for asset-light tech).
- Market Anchor (SMA50) — the 50-day moving average, weighted by recent trading-range stability (tighter Bollinger bands → higher weight). Captures information fundamentals miss (forward consensus, sentiment, supply/demand) — but only when recent trading is steady enough that the market has converged on a view. During wild breakouts or breakdowns the anchor's weight collapses.
- Options Expected (B-L 30d) — the risk-neutral expected stock price at 30-day options expiration, derived from the full implied-volatility surface via Breeden-Litzenberger (second derivative of call price wrt strike → implied PDF, then E[S_T]). Forward-looking, captures all options-implied information (smile, skew, term structure) in one number. Weighted by chain liquidity. SP500-only at present (pre-computed daily). Backtest evidence: adds modest alpha across most bucket × holding combos.
- Blended value — weighted average. Confidence reflects how many methods fired and how tight peer dispersion is.
- Deviation pill — green when blended FV ≥ 10% above current price (undervalued); red when ≥ 10% below; grey otherwise.
| 10-yr Treasury (rf) | 5.15% |
| Beta vs SPY | 0.71 |
| Cost of Equity (CAPM) | 8.72% (VRP-adj) |
| WACC | 7.53% |
| Volatility Risk Premium | +40.5pp (IV − HV30) |
| Effective Tax Rate | 23.0% |
| Rev. Growth (YoY, DCF input) | -4.1% |
| DCF Horizon | 10 years explicit + fade |
| Free Cash Flow (TTM) | $0.2B |
| Return on Equity (TTM) | 10.2% |
| Book / Price | 62.9% — banking bias active (P/B is primary) |
| Gross Margin (TTM) | 47.7% |
| FCF Margin (TTM) | 20.9% |
| Debt / Equity | 0.79 |
| Quality Score | 2/6 — normal (10y DCF) |
| Market-Implied Growth | -8.1% (reverse-DCF on current price) |
| SMA 50 | $24.03 (Market Anchor value) |
| SMA 20 / Bollinger Mid | $26.09 |
| Bollinger Width / SMA20 | 29.4% (drives anchor stability) |
| Net Debt | $0.4B |
| Market Cap | $1B |
Peers used for multiples: HRMY, INVA, PCRX
(filtered from 8 ETF-co-members; sector bias active)
60-Day Conviction
80%
20-Day Fair Value
≈ by Nov 20, 2026
$26.42
α +0.8%
rank 61%
conviction
51%
40-Day Fair Value
≈ by Dec 21, 2026
$26.66
α +1.8%
rank 63%
conviction
56%
60-Day Fair Value
≈ by Jan 19, 2027
$26.93
α +2.8%
rank 67%
conviction
80%
| Method | Implied Price | Weight | Detail |
|---|---|---|---|
| DCF | $35.87 | 26% | |
| DDM (Gordon) | n/a | 0% | |
| Peer P/E | $21.01 | 8% | median 12.4× · 3 peers |
| Peer EV/EBITDA | $19.69 | 8% | median 7.6× · 3 peers |
| Peer P/B | $35.57 | 8% | median 2.2× · 3 peers |
| Peer P/S | $36.78 | 8% | median 2.4× · 3 peers |
| Market Anchor (SMA50) | $24.03 | 44% | stability 85% (BB-width) |
| Options Expected (B-L 30d) | $27.26 | 0% | 7 strikes · skew -0.18 |
As of 2026-10-22 · updated
Related
About
- Industry (SIC)
- PHARMACEUTICAL PREPARATIONS (2834) · industry map
- Exchange
- XNAS
- Market Cap
- $1.1B
- Employees
- 1,976
- List Date
- 2014-06-25
- CIK
- 0001297184
- Next Earnings
- 2026-11-05 (After-Close)
- EPS Forecast
- $0.84 (1 est.)
- Headquarters
- Rancho Cucamonga, CA
- Homepage
- https://www.amphastar.com
Amphastar Pharmaceuticals Inc is a bio-pharmaceutical company focusing on developing, manufacturing, marketing, and selling technically challenging generic and proprietary injectable, inhalation, and intranasal products, as well as insulin active pharmaceutical ingredient (or insulin API products. The company's finished products are used in hospital or urgent care clinical settings and are contracted and distributed through group purchasing organizations and drug wholesalers. The company has one reportable segment: pharmaceutical products. Geographically, the business presence of the firm is s…
Summary
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composite
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No summary data available for this symbol yet.
Each spoke is this symbol's rank within its sector (0–100; the dotted ring marks the sector median at 50). Higher is more constructive for a long. One spoke — News sentiment — is an absolute reading, not a sector rank. Grayed spokes have no data. A fuller shape is a summary, not a recommendation.
Chart
Seasonality
| Month | '21 | '22 | '23 | '24 | '25 | '26 | Avg |
|---|---|---|---|---|---|---|---|
| Jan | -9.73% | 0.09% | 7.30% | -14.34% | -4.10% | 0.11% | -3.45% |
| Feb | -5.04% | 12.28% | 4.08% | -12.94% | -14.85% | -27.54% | -7.33% |
| Mar | 4.81% | 30.88% | 2.57% | -5.00% | 5.34% | -6.76% | 5.31% |
| Apr | -3.81% | -5.19% | -6.19% | -5.04% | -13.72% | 8.50% | -4.24% |
| May | 8.18% | 5.18% | 19.02% | 0.59% | 7.66% | -13.85% | 4.46% |
| Jun | 5.66% | -7.62% | 27.32% | -5.33% | -9.54% | 9.55% | 3.34% |
| Jul | 2.50% | 5.77% | 5.31% | 13.01% | -10.24% | -1.24% | 2.52% |
| Aug | -7.44% | -19.98% | -12.09% | 14.82% | 44.37% | 11.42% | 5.18% |
| Sep | -3.70% | -5.39% | -15.66% | 3.30% | -13.50% | 12.41% | -3.76% |
| Oct | -3.46% | 8.80% | -1.03% | 4.51% | -5.52% | 3.35%* | 1.11% |
| Nov | 3.60% | -5.69% | 23.94% | -10.92% | 9.49% | -- | 4.08% |
| Dec | 17.27% | -6.66% | 6.79% | -19.07% | -2.44% | -- | -0.82% |
| Total | 5.85% | 3.92% | 66.55% | -35.30% | -18.23% | -11.46% | 1.89% |
Technical Indicators
Quick-reference for reading the values below. Indicators combine to confirm a view — no single one is a trade signal on its own.
Trend Indicators
- SMA 20 / 50 / 200 — price above = uptrend, below = downtrend. SMA 50 crossing SMA 200 is the golden/death cross.
- EMA 12 / 26 — faster-reacting averages; 12 above 26 is short-term bullish.
- MACD — bullish when MACD > signal (green badge), bearish when below. Divergence from price often precedes reversals.
- ADX (14) — trend strength regardless of direction. <20 range, 20–25 weak trend, 25–50 trend, >50 strong trend.
- +DI / −DI — +DI > −DI favors bulls; the reverse favors bears. Read alongside ADX.
Momentum Oscillators
- RSI (14) — <30 oversold, >70 overbought. 40–60 is neutral; trending names can stay extreme.
- Stochastic %K / %D — <20 oversold, >80 overbought. %K crossing %D is an early momentum signal.
- Williams %R — inverted scale: <−80 oversold, >−20 overbought.
Oscillators work best in range-bound markets; in strong trends they give premature reversal signals.
Volume & Volatility
- Bollinger Bands — price at upper band = overbought, lower = oversold. Narrow bands (squeeze) often precede expansion.
- OBV — cumulative volume; rising OBV confirms uptrend, falling OBV confirms downtrend. Divergence from price is a warning.
- Vol SMA 20 / Vol ROC — today's volume vs. 20-day average. Positive ROC with price move = conviction.
- ATR / True Range — average daily $ move; sizing and stop-loss reference.
- HV 20 / 30 / 60 — realized (historical) volatility. Compare to IV on the options cards: IV > HV = rich premium.
Confluence matters: trend + momentum + volume agreeing carries far more weight than any single indicator. For how these feed the spread scanner score, see the algorithm docs →
Trend Indicators
SMA 20: $26.09
SMA 50: $24.03
SMA 200: $22.31
Current: $26.20
EMA 12: $26.02
EMA 26: $25.44
MACD: 0.5836 | Signal: -0.1402
BULLISH
ADX (14): 42.55
STRONG TREND
+DI: 24.21
−DI: 16.04
Momentum Oscillators
RSI (14): 58.00
NEUTRAL
Stoch %K: 51.37
Stoch %D: 46.65
Williams %R: -43.48
Volume & Volatility
BB Upper: $27.09
BB Lower: $25.09
NEUTRAL
OBV: -8,834,299
Vol SMA 20: 455,906
Vol ROC: -49.73%
ATR: $0.88
True Range: $0.84
HV 20: 36.8%
HV 30: 33.3%
HV 60: 31.7%
Data Summary
Data Points: 500
Last Updated:
Date Range: 2024-10-23T00:00:00 – 2026-10-21T00:00:00
AI Analysis
LLM Stock Analysis Report
Executive Summary BULLISH (Confidence Level: 7/10)
Key drivers:
- Technical indicators pointing to a short-term uptrend
- Positive recent news headlines supporting the stock's move
- Low volatility, indicating a relatively stable market condition
Primary risks:
- Potential for mean reversion if price becomes overbought
- Dependence on sector performance (healthcare/pharmaceuticals)
Investment thesis: AMPH is poised to continue its short-term uptrend, driven by positive news sentiment and technical momentum. However, caution should be exercised due to potential mean reversion risks.
Recent news sentiment impact: The stock's recent move can be attributed to a string of positive news headlines, including the White House sparing generic drugs from tariffs (Benzinga, 2025-10-09) and DelveInsight's report on the global antidote market crossing USD 4 billion by 2032.
Technical Analysis Trend Direction: Short-term (1-4 weeks) uptrend
Support/Resistance Levels:
- Upper Bollinger Band: $20.77
- Middle Band: $19.70
- Lower Band: $18.63
- SMA 20: $19.70
- EMA 12: $19.96
Momentum Signals: RSI (14): 54.83 (neutral) MACD: 0.15 / Signal: 0.07 / Histogram: 0.08 (bullish)
Volume Analysis: Volume SMA 20: 403132.65; On-Balance Volume (OBV): -8171460.37
News & Sentiment Analysis Recent Headlines Summary:
- Teva, Viatris On Investor Watch As White House Spares Generic Drugs From Tariffs (Benzinga, 2025-10-09) — POSITIVE
- Global Antidote Market to Cross the USD 4 Billion Mark by 2032 | DelveInsight (GlobeNewswire Inc., 2025-06-05) — POSITIVE
- JP Morgan Shows Most Interest In Teva, Organon As Specialty Pharma Sector Exhibits Signs Of Stability (Benzinga, 2024-09-06) — POSITIVE
Sentiment Assessment: Aggregate news sentiment is positive, indicating a bullish outlook.
Catalyst Identification:
- Upcoming events: none
- Earnings: no earnings data available
- Product launches: none
- Regulatory changes: none
Market Narrative: The recent surge in AMPH can be attributed to the accumulation of positive news headlines, which have contributed to the stock's uptrend.
Risk & Volatility Assessment Beta Interpretation: 0.69 (vs SPY) — low volatility
Volatility Regime: Low volatility - stock moves less than market
Options Market Signals:
- IV Rank: 39.8% (Medium)
- Current IV: 113.4%
- Expected Move: $4.42 (39 DTE), 7-DTE: $2.65
- Volume Flow: 296 calls vs 95 puts
- Open Interest: 322 calls vs 80 puts
- Put/Call Volume Ratio: 0.32 (Bullish sentiment)
Downside Protection:
- Support levels: SMA 20, EMA 12
- Risk management considerations: stop-loss levels and position sizing considerations
Market Context & Positioning Sector Performance:
- Relative strength vs sector/market: healthcare/pharmaceuticals sector outperforming market
Institutional Activity:
- Volume patterns suggesting institutional interest: none
Correlation Analysis:
- How stock moves relative to market (R-squared interpretation): 0.16 — low correlation
Relative Valuation:
- Position within trading range: AMPH is currently above its 20-day SMA and 12-day EMA, indicating a relatively strong position within the trading range.
Key Levels & Action Items Critical Price Levels:
- Support levels: SMA 20, EMA 12
- Resistance levels: Upper Bollinger Band
Breakout/Breakdown Levels:
- Technical levels that could trigger significant moves: none
Time-Sensitive Catalysts:
- Earnings: no earnings data available
- Product launches: none
- Regulatory changes: none
Risk Management:
- Stop-loss levels and position sizing considerations: AMPH is relatively stable, but caution should be exercised due to potential mean reversion risks.
Please note that this analysis is based on the provided data and may not reflect real-world market conditions or actual stock performance.
Generated
News
All AMPH news →
Earnings History
10 of 19 under expected move
Avg Expected Move
13.23%
Avg Actual Move
10.21%
| Earnings Date | Timing | Expected Move | Actual Move | Ratio | Outcome |
|---|---|---|---|---|---|
| 2021-03-15 | After-Close | 8.41% | 3.71% | 0.44x | Within |
| 2022-03-10 | After-Close | 9.55% | 12.57% | 1.32x | Exceeded |
| 2022-05-09 | After-Close | 12.44% | 7.05% | 0.57x | Within |
| 2022-08-08 | After-Close | 12.58% | 15.07% | 1.20x | Exceeded |
| 2022-11-07 | After-Close | 7.31% | 9.37% | 1.28x | Exceeded |
| 2023-05-09 | After-Close | 12.98% | 13.04% | 1.00x | Exceeded |
| 2023-08-08 | After-Close | 11.74% | 4.29% | 0.37x | Within |
| 2023-11-08 | After-Close | 12.42% | 15.39% | 1.24x | Exceeded |
| 2024-02-28 | After-Close | 12.97% | 14.93% | 1.15x | Exceeded |
| 2024-05-08 | After-Close | 14.62% | 0.52% | 0.04x | Within |
| 2024-08-07 | After-Close | 14.53% | 13.29% | 0.91x | Within |
| 2024-11-06 | After-Close | 10.72% | 13.69% | 1.28x | Exceeded |
| 2025-02-27 | After-Close | 13.02% | 9.72% | 0.75x | Within |
| 2025-05-07 | After-Close | 20.47% | 0.90% | 0.04x | Within |
| 2025-08-07 | After-Close | 13.30% | 10.13% | 0.76x | Within |
| 2025-11-06 | After-Close | 14.44% | 0.83% | 0.06x | Within |
| 2026-02-26 | After-Close | 17.37% | 23.63% | 1.36x | Exceeded |
| 2026-05-07 | After-Close | 14.36% | 20.93% | 1.46x | Exceeded |
| 2026-08-06 | After-Close | 18.17% | 4.90% | 0.27x | Within |
Earnings calendar: this week’s reports with expected vs actual moves →
AMPH Options Activity & IV Rank
AMPH IV rank history, 52-week IV rank and IV percentile →
Volatility Metrics
Current IV: 69.1%
7-DTE IV: —
Expected Move: $4.57
7-DTE Move: $4.57
Days to Exp: 30 (2026-11-20)
Options Flow
Call Volume: 13
Put Volume: 1
P/C Volume: 0.077
BULLISH
Call OI: 63
Put OI: 3
P/C OI: 0.048
Total OI: 66
ATM Options Pricing
ATM Call: $2.42
ATM Put: $2.15
Call %: 9.3%
Put %: 8.2%
Chain Summary
Chain Volume: 88
Chain OI: 386
Last Updated: 10/21/2026
Spread Scanner GPU
Each spread is ranked by a composite score built in three stages. Full documentation →
Stage 1 — Base Score (GPU scanner)
score = P(profit) × (credit / spread_width)
P(profit) from short leg delta (1 − |delta|), penalised above 85%. Credit uses mid-price to handle illiquid chains fairly.
Stage 2 — Skew Adjustment (±25% cap)
RR and BF (30-delta) from the persisted per-symbol skew snapshot — wing strikes picked by real greeks.delta, not a moneyness proxy. Put skew boosts bull puts, penalises bear calls. High butterfly boosts iron condors. Calendars are skew-neutral.
Stage 3 — Technical Overlay (±50% cap, 5 groups)
Group 1 · Directional Bias (±0.25)
- RSI <40 bullish / >60 bearish
- MACD crossover + histogram trend
- Price vs SMA 50 & SMA 200
Group 2 · Momentum (±0.10)
- Stochastic %K <20 / >80
- Williams %R <−80 / >−20
Group 3 · Volatility (up to −0.25 / +0.15)
- Blended ATR + straddle expected-move penalty
- Bollinger Band signal (+ counter-trend penalty)
- BB width — vol contraction boost for ICs
Group 4 · IV Regime (±0.15)
- IV rank ≥ 75 → strong boost for credit spreads
- IV rank < 25 → penalty (selling cheap vol)
Group 5 · Liquidity (penalty up to −0.10)
- Min open interest across all legs
- OI < 100 → −0.10 · OI < 500 → −0.05
score = base_score × skew_multiplier × tech_multiplier
Both multipliers are shown per spread. Beta is informational only — ATR already captures realized vol. Full algorithm documentation →
Enter a ticker to scan for optimal spread opportunities.
Evaluates all bull put, bear call, iron condor, and calendar spread combinations using GPU-accelerated analysis.
Dealer Positioning
TYPICAL γ
Estimated net dealer gamma is at the 63rd percentile of this name's own daily history, within its typical range. This describes current positioning; it is not a forecast or a trading signal.
Gamma percentile
63%
vs own history
GEX tilt
+1.00
OI-weighted, today
Vanna tilt
+0.68
δ-sensitivity to IV
Charm tilt
-0.79
δ-decay vs time
Vanna tilt +0.68: the estimated dealer exposure leans positive, so the modeled hedge would shift noticeably if implied volatility changed.
Charm tilt -0.79: the estimated dealer exposure leans negative, so the modeled hedge would shift noticeably as time passes and options approach expiry.
? What is this?
· 3 ATM contracts, 0k total OI
Net dealer gamma is an estimate of the aggregate gamma held by options market makers across this name's option chain, weighted by open interest. Dealer positions aren't public, so it uses a standard simplifying assumption: dealers are treated as long the calls and short the puts that are open. Actual dealer books can differ.
Gamma percentile ranks today's estimate against this name's own daily history, from 0% (the lowest reading on record) to 100% (the highest). Raw gamma scales with how much open interest a chain carries, so it isn't comparable across names; the percentile is. The badge marks the bottom 20% as low and the top 20% as high.
Tilts run from −1 to +1 and show how lopsided the estimated dealer exposure is. GEX tilt compares call gamma with put gamma. Vanna tilt describes how the hedge would shift if implied volatility changed, and charm tilt how it would shift with the passage of time.
This card describes estimated positioning and where it sits historically. It is not a forecast of price direction or volatility and not a trading signal. Market-wide view: Dealer positioning screener.
Skew (Wing IV − ATM IV)
DTE:
Wing Δ:
Wing vs ATM
IV(put wing) − IV(ATM), in vol pointsHow much the OTM put trades above (or below) the at-the-money strike. Measures the height of the put-side tail relative to ATM — i.e. how expensive crash insurance is on this name.
- Positive (typical) — wing IV > ATM IV. Standard equity put skew: portfolios bid up crash protection, so OTM puts trade richer than ATM.
- Near zero or negative (unusual) — wing IV ≤ ATM IV. Flat or inverted put side. Common when there's no fear demand, in tightly mean-reverting names, or right after an earnings catalyst clears.
- Percentile vs own 3-yr history: high = wings rich (good time to sell wing premium); low = wings cheap (good time to buy protection).
- Not directional — high or low wings don't predict up or down moves. It's a price tag on tail insurance, not a forecast.
Risk Reversal
IV(call wing) − IV(put wing), equal delta on each sideWhich side of the smile is the market paying up for? Measures the tilt of the surface — call skew vs put skew at matched deltas.
- Negative (typical) — puts richer than calls. Standard equity behavior: hedging demand makes puts carry a premium. Most large-caps sit in the −1 to −5 vol-point range.
- Strongly negative (< −5 pts) — heavy downside hedging, elevated fear, or an upcoming catalyst (earnings, FDA, macro event). Worth flagging.
- Positive — calls richer than puts. Unusual for equities; signals bullish momentum, short-squeeze positioning, or takeover/M&A speculation.
- Near zero — symmetric surface. Market sees roughly equal up/down risk. Rare for large-caps; more common in commodities and FX.
Reading them together
Wing-vs-ATM tells you how expensive the tails are. Risk Reversal tells you which side is favored. Combined:
- High wing percentile + deeply negative RR → strong put bid; stress or major event priced in. Owning protection costs a premium; selling put premium is dangerous.
- Low wing percentile + near-zero RR → complacency; insurance cheap and balanced. Good environment to add cheap downside hedges.
- Positive RR + elevated wings → call-side fear-of-missing-out; common in squeeze setups. Upside calls expensive, downside puts not bid.
14 DTE / 10d
—
—
pts
EXTREME
as of Oct 21 · No data
30 DTE / 10d
—
—
pts
EXTREME
as of Oct 21 · ATM 58.1% / Wing —
Extreme reading.
Historically these have been contrarian — on the small set of observed earnings-day cases, large negative wing-vs-ATM gaps (calls pricing much richer than puts at the same delta) preceded sharp drops in the underlying within 1-12 days. Not financial advice and the dataset is small.
Percentile is the rank of today's reading within ~3 years of this symbol's own history. High percentile = wings are rich relative to history; not a directional signal. Skew is read off the chain in real time, not from CBOE SKEW.
Volatility Surface
Enter a ticker to render the implied volatility surface.
Volatility Smile
Enter a ticker to render the implied volatility smile.
IV Rank (7 DTE)
IV Rank (30 DTE)42.6MediumOct 21
Straddle Price (30 DTE)$4.57Oct 21
Beta Analysis
Risk Metrics
Beta: 0.5282
Alpha: 13.82%
Correlation: 0.1306
R-Squared: 1.7%
Stock Volatility: 51.4%
Market Volatility: 12.7%
Analysis Details
Benchmark: SPY
Data Points: 251
Period: 252 trading days
Data Points: 251
Period: 252 trading days
Interpretation:
Low volatility - stock moves less than market
Low volatility - stock moves less than market
Beta & Alpha Over Time
Notable investors who own AMPH
6 of 37 tracked investors
| Investor | Value | Share of their portfolio | Rank | Q/Q shares | Source |
|---|---|---|---|---|---|
| Oaktree Capital Asset manager Howard Marks | $37.2M | #44 of 130 | +7.5% | 13F | |
| Millennium Management Hedge fund Izzy Englander | $31.6M | #861 of 3716 | +9063.8% | 13F | |
| Renaissance Technologies Hedge fund Jim Simons | $10.6M | #1031 of 3138 | -5.2% | 13F | |
| Point72 Hedge fund Steve Cohen | $1.1M | #1455 of 1945 | new | 13F | |
| Citadel Hedge fund Ken Griffin | $328K | #4972 of 6285 | -75.2% | 13F | |
| Rockefeller Capital Management Family office Rockefeller family | $0K | #4675 of 4729 | -94.4% | 13F |
Hedge funds, activists, holding companies and family offices we track, from their latest 13F (quarter-end value) and Form 4 filings in the last 3 years. Family offices · all institutions
AMPH Institutional Ownership (13F)
Latest filings — 2026-09-30
? 13F Guide
Diluted shares outstanding: 46,643,750 (as of 2026-06-30)
Institutional managers with $100M+ AUM file Form 13F-HR quarterly, due 45 days after quarter end. Holdings are reported gross at quarter-end market value — they are a snapshot, not a real-time position.
- Shares — long equity positions in this name, aggregated across share classes.
- Calls / Puts — notional value of long call / put exposure where this ticker is the underlying.
- % of Float — holder's reported shares divided by the latest diluted shares outstanding. Sums above 100% indicate large custodian / prime broker positions where the same shares are reported by multiple filers.
- Custodian badge — filers with more than 5,000 holdings are typically broker-dealers / custodians reporting customer-held shares, not active managers.
Each filer is counted once at its latest 13F-HR filing. New filings are ingested on a weekly cadence.
4 filers$561.00K notional
| # | Filer | Notional Value | % of Total | Period |
|---|---|---|---|---|
| 1 | Susquehanna International Group, LLP Custodian | $226.02K | 40.29% | 2026-06-30 |
| 2 | Citadel Advisors LLC Custodian | $221.98K | 39.57% | 2026-06-30 |
| 3 | GROUP ONE TRADING LLC Custodian | $102.92K | 18.35% | 2026-06-30 |
| 4 | Simplex Trading, LLC Custodian | $10.09K | 1.80% | 2026-06-30 |
1 filers$209.87K notional
| # | Filer | Notional Value | % of Total | Period |
|---|---|---|---|---|
| 1 | Citadel Advisors LLC Custodian | $209.87K | 100.00% | 2026-06-30 |
AMPH Insider Trading (Form 4)
Latest: 2026-09-23Form 4 filings — insider beneficial-ownership changes by officers, directors, and 10%+ holders. Filed within 2 business days of transaction.
| Filed | Reporter | Role | Action | Shares | Avg Price | Net $ | Link |
|---|---|---|---|---|---|---|---|
| 2026-09-23 | William J Peters | CFO, EVP & TREASURER | Sell (S) | −4,139 | $25.00 | -$103.5K | EDGAR |
| 2026-09-17 | Rong Zhou | SENIOR EVP, PRODUCTION CENTER | Mixed | — | $18.65 | -$105.9K | EDGAR |
| 2026-09-03 | Rong Zhou | SENIOR EVP, PRODUCTION CENTER | Sell (S) | −3,187 | $23.63 | -$75.3K | EDGAR |
| 2026-08-12 | Richard K Prins | Director | Sell (S) | −7,973 | $20.30 | -$161.9K | EDGAR |
| 2026-08-11 | William J Peters | CFO, EVP & TREASURER | Mixed | −3,127 | $21.45 | -$83.9K | EDGAR |
| 2026-07-13 | Anthony T Pierce | Director | Award (A) | +7,886 | — | EDGAR | |
| 2026-06-03 | Michael A Zasloff | Director | Award (A) | +8,143 | — | EDGAR | |
| 2026-06-03 | Richard K Prins | Director | Mixed | +6,643 | — | EDGAR | |
| 2026-06-03 | Howard Lee | Director | Mixed | +7,374 | $18.45 | -$14.2K | EDGAR |
| 2026-06-03 | Gayle Deflin | Director | Award (A) | +8,143 | — | EDGAR | |
| 2026-06-03 | David Russell Gaugh | Director | Award (A) | +8,143 | — | EDGAR | |
| 2026-06-03 | Diane G. Gerst | Director | Award (A) | +8,143 | — | EDGAR | |
| 2026-03-17 | Rong Zhou | SENIOR EVP, PRODUCTION CENTER | Tax (F) | −1,225 | $18.18 | -$22.3K | EDGAR |
| 2026-03-17 | Yakob Liawatidewi | EVP CORP ADMIN CENTER | Tax (F) | −1,033 | $18.18 | -$18.8K | EDGAR |
| 2026-03-17 | Jack Y. Zhang | CEO & CHIEF SCIENTIFIC OFFICER | Tax (F) | −25,384 | $18.18 | -$461.5K | EDGAR |
Codes: P = open-market purchase · S = open-market sale · A = grant/award · M = option exercise · F = tax withholding at vest · G = bona-fide gift · D = disposition to issuer · J = other (described in filing footnote — typically 401(k), trust, inheritance) · W = will/inheritance. Only P / S codes carry directional signal.
AMPH Insider Holdings
13 insiders · @ $26.20
Officers, directors, and 10%+ owners who have filed a Form 4 in the past two years, ranked by current disclosed exposure (shares × today's price). Shares are direct + indirect (via trusts / LLCs / spouse). Excludes unvested RSU and option grants — those aren't beneficially owned until vest.
| # | Insider | Role | Shares | Disclosed Exposure | Lifetime OM Net | Filings | Last Filed |
|---|---|---|---|---|---|---|---|
| 1 | Mary Z. Luo | COO, Chief Scientist, Chairman | 9,669,569 | $253.34M | -$46.15M | 26 | 2026-03-06 |
| 2 | Jack Y. Zhang | CEO & CHIEF SCIENTIFIC OFFICER | 4,235,177 | $110.96M | -$63.66M | 32 | 2026-03-17 |
| 3 | Rong Zhou | SENIOR EVP, PRODUCTION CENTER | 184,203 | $4.83M | -$6.58M | 65 | 2026-09-17 |
| 4 | William J Peters | CFO, EVP & TREASURER | 168,707 | $4.42M | -$23.22M | 85 | 2026-09-23 |
| 5 | Howard Lee | Director | 160,119 | $4.20M | -$4.97M | 28 | 2026-06-03 |
| 6 | Yakob Liawatidewi | EVP CORP ADMIN CENTER | 124,351 | $3.26M | -$7.14M | 55 | 2026-03-17 |
| 7 | Floyd F. Petersen | Director | 73,794 | $1.93M | -$4.77M | 79 | 2025-12-15 |
| 8 | Michael A Zasloff | Director | 37,667 | $986.9K | -$7.38M | 28 | 2026-06-03 |
| 9 | Diane G. Gerst | Director | 31,899 | $835.8K | -$1.57M | 36 | 2026-06-03 |
| 10 | Richard K Prins | Director | 29,625 | $776.2K | -$7.62M | 48 | 2026-08-12 |
Lifetime OM Net = signed sum of open-market buys (P) and sells (S) over their career; excludes grants, tax withholdings, and dispositions to issuer. A large negative number is normal for long-tenured executives — they've sold compensation grants over many years.
AMPH Board & Officers
As of SEC filings through Sep 23, 2026Directors 12
- Floyd F. Petersen · since Jun 24, 2014
- Howard Lee · since Jun 24, 2014
- Jack Y. Zhang · since Jun 24, 2014
- Mary Z. Luo · since Jun 24, 2014
- Michael A Zasloff · since Jun 24, 2014
- Richard K Prins · since Jun 24, 2014
- Diane G. Gerst · listed since Jun 2019
- Gayle Deflin · since Jun 7, 2021
- William J Peters · listed since Apr 2023
- Yakob Liawatidewi · listed since Apr 2023
- David Russell Gaugh · since Jul 18, 2025
- Anthony T Pierce · since Jul 9, 2026
Officers 5
- Jack Y. Zhang · CEO & Chief Scientific Officer · listed since Mar 2017
- William J Peters · CFO, EVP & Treasurer · listed since May 2021
- Mary Z. Luo · COO, Chief Scientist, Chairman · listed since Mar 2023
- Yakob Liawatidewi · EVP Corp Admin Center · listed since Jun 2020
- Rong Zhou · Senior EVP, Production Center · listed since Dec 2023
10% owners 2
- Jack Y. Zhang · since Jun 24, 2014
- Mary Z. Luo · since Jun 24, 2014
Changes in the last 10 years (16)
| Jul 9, 2026 | Anthony T Pierce became a director |
| Jul 18, 2025 | David Russell Gaugh became a director |
| Dec 5, 2023 | Rong Zhou listed as Senior EVP, Production Center (previously EVP, Production Center) in SEC filings |
| Apr 12, 2023 | Yakob Liawatidewi first listed as a director in an SEC filing |
| Apr 12, 2023 | William J Peters first listed as a director in an SEC filing |
| Mar 20, 2023 | Mary Z. Luo listed as COO, Chief Scientist, Chairman (previously CEO & Chief Scientific Officer) in SEC filings |
| Mar 17, 2022 | Mary Z. Luo listed as CEO & Chief Scientific Officer (previously COO, Chief Scientist & Chairma) in SEC filings |
| Jun 7, 2021 | Gayle Deflin became a director |
| May 20, 2021 | William J Peters listed as CFO, EVP & Treasurer (previously CFO, SVP & Treasurer) in SEC filings |
| Feb 9, 2021 | Mary Z. Luo listed as COO, Chief Scientist & Chairma (previously COO,Chief Scientist & Chairman) in SEC filings |
| Jun 10, 2020 | Yakob Liawatidewi listed as EVP Corp Admin Center (previously SVP Corp Admin Center) in SEC filings |
| Jun 8, 2020 | David Maris became a director |
| Jun 13, 2019 | Diane G. Gerst no longer listed as EVP, QA & Regulatory Affairs in SEC filings |
| Jun 13, 2019 | Diane G. Gerst first listed as a director in an SEC filing |
| Jun 7, 2018 | Yakob Liawatidewi became SVP Corp Admin Center |
| Mar 20, 2017 | Jack Y. Zhang listed as CEO & Chief Scientific Officer (previously CEO & Chief Science Officer) in SEC filings |
Not reported recently (5)
- Richard Koo · Last reported as a director in an SEC filing dated Jun 8, 2021
- David Maris · Last reported as a director in an SEC filing dated Jun 8, 2021
- Applied Physics & Chemistry Laboratories, Inc. · Last reported as a 10% owner in an SEC filing dated Feb 18, 2021
- Jason B. Shandell · Last reported as a director in an SEC filing dated Mar 18, 2020
- Stephen B. Shohet · Last reported as a director in an SEC filing dated Dec 12, 2018
Compiled from SEC filings by the company and its directors and officers. Dates are as stated in those filings. Where no filing says when someone left, we show the last filing that listed them.
AMPH Proposed Insider Sales (Form 144)
Latest: 2026-09-21
? Form 144 Guide
Last 30d:
1 filing
· $103K notice value
· Last 90d:
5 filings
· $1.7M notice value
· 4 unique filers
· 40% under 10b5-1 plans
What is Form 144? A notice of intent to sell restricted or control stock under Rule 144. Affiliates (officers, directors, 10%+ owners) and holders of restricted shares must file Form 144 when planning to sell more than 5,000 shares or $50,000 in any 3-month rolling window.
How it relates to Form 4: Form 144 is filed before the trade (up to 90 days in advance); Form 4 is filed within 2 business days after the trade executes. Not every Form 144 results in a sale — the filer may cancel or delay. Look for the corresponding Form 4 on the Insider Activity card to confirm a sale actually happened.
10b5-1 plans: Trades made under a pre-scheduled Rule 10b5-1 plan are not discretionary — they execute automatically on dates set months earlier, regardless of news. High 10b5-1 percentages mean less per-filing signal value, though cumulative selling volume still matters.
"Notice value": Aggregate market value the filer wrote into the Form 144 — i.e. the size of the planned sale, not necessarily the executed dollars. An amended notice (Form 144/A) replaces the original it amends, and cancelled notices are dropped, so neither is double-counted above. A filed value that is clearly inconsistent with the share count at the stock's price (a filer typo) shows as a dash and is left out of the totals.
Source & freshness: Sourced from public Form 144 filings. Refreshed daily; new filings typically appear here the morning after they are filed.
Top 90-day filers:
Floyd Petersen (1, $989K) · Rong Zhou (1, $290K) · PETERS WILLIAM J (2, $287K) · Richard Prins (1, $162K)
| Filed | Filer | Role | Shares | Notice Value | Planned Sale | Broker | Plan | Link |
|---|---|---|---|---|---|---|---|---|
| 2026-09-21 | PETERS WILLIAM J | Officer | 4,139 | $103.5K | 2026-09-21 | UBS Financial Services, Inc. | 10b5-1 | EDGAR |
| 2026-09-01 | Rong Zhou | Vice President | 13,187 | $290.1K | 2026-09-01 | UBS Financial Services Inc | — | EDGAR |
| 2026-08-18 | Floyd Petersen | Director | 47,101 | $989.1K | 2026-08-18 | UBS Financial Services Inc | — | EDGAR |
| 2026-08-11 | Richard Prins | Director | 7,973 | $161.9K | 2026-08-11 | UBS Financial Services Inc | — | EDGAR |
| 2026-08-07 | PETERS WILLIAM J | Officer | 8,180 | $183.9K | 2026-08-07 | UBS Financial Services, Inc. | 10b5-1 | EDGAR |
| 2025-12-11 | Floyd Petersen | Director | 4,163 | $333.0K | 2025-12-11 | UBS Financial Services Inc | — | EDGAR |
| 2025-12-10 | Floyd Petersen | Director | 1,737 | $43.4K | 2025-12-10 | UBS Financial Services Inc | — | EDGAR |
| 2025-11-28 | Rong Zhou | Officer | 20,000 | $500.0K | 2025-11-28 | UBS Financial Services Inc | — | EDGAR |
| 2025-11-25 | Richard Prins | Director | 4,179 | $104.5K | 2025-11-25 | UBS Financial Services Inc | — | EDGAR |
| 2025-11-13 | Floyd Petersen | Director | 16,679 | $441.8K | 2025-11-13 | UBS Financial Services Inc | — | EDGAR |
Notice value is the aggregate market value the filer states they intend to sell — not a confirmed transaction. Compare to Insider Activity (Form 4) to see which planned sales actually executed. Market-wide feed: Planned sales (Form 144).
ETF Holders
93 ETFs hold AMPH
25 shown · $250.79M total exposure · 0.05% AUM-weighted avg weight
| # | ETF | Provider | Weight | $ Exposure | ETF AUM | As Of |
|---|---|---|---|---|---|---|
| 1 | IJR iShares Core S&P Small-Cap ETF | iShares (BlackRock) | 0.05% | $48.6M | $103.1B | 2026-10-20 |
| 2 | AVUV Avantis U.S. Small Cap Value ETF | Avantis | 0.11% | $35.6M | $31.4B | 2026-10-20 |
| 3 | DFSV Dimensional US Small Cap Value ETF | Dimensional | 0.08% | $22.3M | — | 2026-10-20 |
| 4 | VTI Vanguard Morningstar Total Stock Market ETF | Vanguard | 0.00% | $21.9M | — | 2026-09-30 |
| 5 | IWM iShares Russell 2000 ETF | iShares (BlackRock) | 0.03% | $21.3M | $75.1B | 2026-10-20 |
| 6 | DFAT Dimensional US Targeted Value ETF | Dimensional | 0.04% | $13.8M | — | 2026-10-20 |
| 7 | VXF Vanguard Extended Market ETF | Vanguard | 0.01% | $9.2M | — | 2026-09-30 |
| 8 | DFAS Dimensional US Small Cap ETF | Dimensional | 0.03% | $8.7M | — | 2026-10-20 |
| 9 | IWN iShares Russell 2000 Value ETF | iShares (BlackRock) | 0.06% | $7.8M | $13.7B | 2026-10-20 |
| 10 | SPSM State Street® SPDR® Portfolio S&P 600™ Small Cap ETF | SPDR (State Street) | 0.05% | $7.4M | $15.7B | 2026-10-20 |
| 11 | XPH State Street® SPDR® S&P® Pharmaceuticals ETF | SPDR (State Street) | 1.58% | $7.1M | $452.3M | 2026-10-20 |
| 12 | CALF Pacer US Small Cap Cash Cows 100 ETF | Nport | 0.16% | $5.6M | — | 2026-04-30 |
| 13 | DFMC Dimensional US Micro Cap ETF | Dimensional | 0.07% | $5.0M | — | 2026-10-20 |
| 14 | VTWO Vanguard Russell 2000 ETF | Vanguard | 0.03% | $4.8M | — | 2026-09-30 |
| 15 | IJT iShares S&P Small-Cap 600 Growth ETF | iShares (BlackRock) | 0.05% | $3.9M | $7.6B | 2026-10-20 |
| 16 | BSVO EA Bridgeway Omni Small-Cap Value ETF | Nport | 0.14% | $3.3M | — | 2026-06-30 |
| 17 | IJS iShares S&P Small-Cap 600 Value ETF | iShares (BlackRock) | 0.04% | $3.2M | $7.6B | 2026-10-20 |
| 18 | SCHA Schwab U.S. Small-Cap ETF | Nport | 0.01% | $3.2M | — | 2026-05-31 |
| 19 | FSMD Fidelity Small-Mid Multifactor ETF | Fidelity | 0.12% | $3.0M | $2.5B | 2026-10-20 |
| 20 | VIOO Vanguard S&P Small-Cap 600 ETF | Vanguard | 0.05% | $2.9M | — | 2026-09-30 |
| 21 | IHE iShares U.S. Pharmaceuticals ETF | iShares (BlackRock) | 0.18% | $2.7M | $1.5B | 2026-10-20 |
| 22 | VHT Vanguard Health Care ETF | Vanguard | 0.01% | $2.5M | — | 2026-09-30 |
| 23 | DFAC Dimensional US Core Equity 2 ETF | Dimensional | 0.00% | $2.4M | — | 2026-10-20 |
| 24 | SLYG State Street® SPDR® S&P 600™ Small Cap Growth ETF | SPDR (State Street) | 0.05% | $2.3M | $4.6B | 2026-10-20 |
| 25 | SLYV State Street® SPDR® S&P 600™ Small Cap Value ETF | SPDR (State Street) | 0.04% | $2.0M | $4.7B | 2026-10-20 |
Fundamentals
Quarterly filings sourced from SEC 10-Q / 10-K reports. TTM tiles aggregate the most recent four quarters; bars show the last ~12 quarters oldest → newest.
Metrics
- Revenue — top-line sales. Look for consistent YoY growth; seasonal businesses need same-quarter comparisons (Q4 '24 vs Q4 '23).
- Net Income — bottom-line profit after all expenses. Can be volatile from one-time items; red bars = net loss.
- Diluted EPS — net income per share assuming options/converts are exercised. Direct input to the P/E ratio.
- Operating Cash Flow — cash generated from core operations, before capex and financing. Harder to manipulate than net income; growing OCF is a quality signal.
How to read the bars
- Sequential growth — quarter-over-quarter trend. Accelerating bars are a momentum signal.
- YoY growth — compare to the same quarter a year earlier to remove seasonality.
- Quality — OCF should roughly track Net Income over time. Large divergence (net income ≫ OCF) flags accruals risk.
- Margins — scan the bar ratios: Net Income / Revenue tells you margin trend without needing a separate chart.
TTM (trailing-twelve-month) smooths seasonality and is used for the P/E calculation. Filings appear 30–90 days after the period closes.
Trailing P/E
15.50
TTM Diluted EPS
$1.69
TTM Revenue
$730.02M
TTM Net Income
$78.55M
TTM Op. Cash Flow
$184.61M
Quarterly figures (12 quarters)
| Quarter | Period End | Revenue | Net Income | Diluted EPS | Op. Cash Flow |
|---|---|---|---|---|---|
| Q2 '26 | 2026-06-30 | $183.90M | $30.35M | $0.67 | $51.32M |
| Q1 '26 | 2026-03-31 | $171.17M | $6.42M | $0.14 | $47.84M |
| Q4 '25 | 2025-12-31 | $183.10M | $24.43M | $0.51 | $32.86M |
| Q3 '25 | 2025-09-30 | $191.84M | $17.35M | $0.37 | $52.58M |
| Q2 '25 | 2025-06-30 | $174.41M | $31.03M | $0.64 | $35.59M |
| Q1 '25 | 2025-03-31 | $170.53M | $25.29M | $0.51 | $35.08M |
| Q4 '24 | 2024-12-31 | $186.52M | $37.96M | $0.74 | $29.02M |
| Q3 '24 | 2024-09-30 | $191.21M | $40.43M | $0.78 | $59.96M |
| Q2 '24 | 2024-06-30 | $182.39M | $37.95M | $0.73 | $69.11M |
| Q1 '24 | 2024-03-31 | $171.84M | $43.18M | $0.81 | $55.29M |
| Q4 '23 | 2023-12-31 | $178.10M | $36.17M | $0.69 | $23.86M |
| Q3 '23 | 2023-09-30 | $180.56M | $49.22M | $0.91 | $64.33M |
Q2 2026 • period ending 2026-06-30 • filed 2026-08-06
Valuation
Ratios derived from TTM financials and the current market price, sampled daily. History chart shows how expensive the stock is today relative to its own recent past.
Price Multiples
- P/E — price / TTM earnings. Rough market rule: 10–15 value, 15–25 market, >30 growth/premium. Negative when earnings are negative.
- P/B — price / book value. Useful for financials and asset-heavy names; meaningless for asset-light software.
- P/S — price / TTM revenue. Useful when earnings are negative or noisy (early-stage growth).
- EV/EBITDA — capital-structure-neutral. <10 cheap, 10–15 reasonable, >20 rich. Good for comparing across leverage profiles.
- EV/Sales — like P/S but accounts for debt + cash. Compare within sector.
Profitability & Yields
- ROE — return on equity. >15% strong, >25% exceptional. Caution: high leverage inflates ROE.
- ROA — return on assets. Leverage-neutral; >5% solid, >10% exceptional.
- Div Yield — annual dividend / price. Compare to 10Y Treasury; sustained yield >6% often signals distress.
- FCF Yield — free cash flow / market cap. >5% is attractive; negative means burning cash.
Balance Sheet
- Debt/Equity — leverage. <1 conservative, >2 aggressive. Sector-dependent (utilities naturally high, tech low).
- Current Ratio — short-term liquidity. >1.5 comfortable, <1 raises short-term solvency flags.
Reading the history chart
- Compare current level to the 3-year band: near the high end = relatively expensive; near the low = relatively cheap.
- Multiples expanding while earnings are flat = sentiment-driven rally.
- Multiples compressing while earnings grow = value coming from fundamentals.
P/E
15.50
P/B
1.59
P/S
1.67
EV/EBITDA
9.38
EV/Sales
2.20
ROE
10.2%
ROA
4.5%
Div Yield
0.00%
FCF Yield
15.11%
Debt/Equity
0.79
Current Ratio
—
Market Cap
$1.22B
as of 2026-10-21
Short Interest & Float
Regulatory short-interest reports publish on a bi-weekly settlement cadence; short-volume is reported daily by the trade-reporting facilities. Float is derived from insider-ownership filings.
Metric definitions
- Short Interest — total shares currently sold short as of the settlement date. Lags real time by ~8 business days.
- SI % of Float — short interest / free float. The key crowding metric.
- Days to Cover — short interest / avg daily volume. How many full trading days it would take shorts to buy back. High DTC + catalyst = squeeze fuel.
- Short Vol Ratio — today's short-sale volume / total volume. Intraday selling pressure proxy (not the same as short interest).
- Free Float — shares available for public trading (total shares minus insider / restricted).
- Float % — free float / shares outstanding. <50% = tightly held, more prone to squeezes.
How to read the signals
- SI % of Float < 5% — typical, no particular signal.
- 5–15% — elevated; watch for catalysts (earnings, guidance, macro).
- 15–30% — heavily shorted; tight-float names in this range have produced notable squeezes historically.
- >30% — extreme; borrow is likely expensive and squeeze risk is material.
- Days to Cover > 5 combined with high SI% amplifies squeeze potential.
History chart
- Trend matters more than level. Rapidly rising short interest often precedes negative catalysts or heavy hedging.
- A sudden drop in SI after a rally may indicate a squeeze in progress.
Short interest is reported mid-month and end-of-month; short volume is daily.
Short Interest
4.41M
SI % of Float
15.12%
Days to Cover
7.10
Short Vol Ratio
74.7%
Free Float
29.13M
Float %
68.5%
Short interest 2026-09-30 • Short volume 2026-10-21 • Float 2026-08-07