ATRA Atara Biotherapeutics, Inc

XNAS 11.55 Delayed
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ATRA $11.55 —
Key stats
$11.55
52-Week Range
$3.92 – $19.14
YTD
-35.00%
Straddle Price
$4.80
P/C Vol Ratio
0.21
Market Cap
$0.1B
Open
$8.68
Day Range
$8.10 – $8.68
Volume
35,268
Prev Close
$8.59
Fair Value

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)4.96%
Beta vs SPY1.47
Cost of Equity (CAPM)12.30%
WACC12.44%
Effective Tax Rate21.0%
Rev. Growth (YoY, DCF input)-10.0%
DCF Horizon10 years explicit + fade
Free Cash Flow (TTM)$-0.0B
Return on Equity (TTM)45.1%
Book / Price-31.2%
Gross Margin (TTM)91.4%
FCF Margin (TTM)-353.5%
Quality Score2/6 — normal (10y DCF)
SMA 50$9.25 (Market Anchor value)
SMA 20 / Bollinger Mid$9.13
Bollinger Width / SMA20225.0% (drives anchor stability)
Net Debt$-0.0B
Market Cap$0B
Blended Fair Value
—
Deviation
—
MethodImplied PriceWeightDetail
DCF n/a 0%
DDM (Gordon) n/a 0%
Peer P/E n/a 0%
Peer EV/EBITDA n/a 0%
Peer P/B n/a 0%
Peer P/S n/a 0%
Market Anchor (SMA50) $9.25 0% stability 0% (BB-width)
Options Expected (B-L 30d) n/a 0%
As of 2026-10-27 · updated
About
Industry (SIC)
BIOLOGICAL PRODUCTS, (NO DIAGNOSTIC SUBSTANCES) (2836) · industry map
Exchange
XNAS
Market Cap
$0.1B
Employees
10
List Date
2014-10-16
CIK
0001604464
Next Earnings
2026-11-11
Headquarters
Thousand Oaks, CA
Homepage
https://www.atarabio.com

Atara Biotherapeutics Inc operates in the United States healthcare sector. It focuses on developing transformative therapies for patients with serious diseases, including solid tumors, hematologic cancers, and autoimmune diseases. It operates and manages business as one operating and reportable segment which is the business of developing therapeutics. The company's product candidates comprise Tab-cel, ATA3431, and ATA3219.

Summary
—
composite
—
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
'21'22'23'24'25'26Avg
Jan-6.01%-9.06%54.57%29.94%-37.29%-70.74%-6.43%
Feb-11.05%-16.94%-21.05%-6.27%-18.90%7.54%-11.11%
Mar-16.05%-9.01%-25.83%-9.95%-15.14%-3.67%-13.28%
Apr-5.70%-33.05%-7.82%-4.83%32.95%-7.74%-4.36%
May-3.49%-25.07%-45.55%-18.06%3.17%114.49%4.25%
Jun11.31%61.28%7.33%-41.19%-3.50%11.67%7.82%
Jul-20.56%-63.49%38.99%17.58%47.69%-26.23%-1.00%
Aug15.94%40.70%-32.09%-26.92%4.33%4.09%1.01%
Sep14.09%-13.10%-4.52%19.38%16.13%-5.76%4.37%
Oct-11.54%21.04%-14.00%16.78%2.77%-1.30%*2.29%
Nov8.36%-6.21%-47.62%25.39%9.03%---2.21%
Dec-9.22%-25.45%-20.84%1.29%33.60%---4.12%
Total-34.99%-78.99%-84.33%-23.47%53.02%-52.16%-36.82%
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: $9.13
SMA 50: $9.25
SMA 200: $7.65
Current: $8.35
EMA 12: $9.05
EMA 26: $9.13
MACD: -0.0800 | Signal: -0.0834
BULLISH
ADX (14): 10.19
RANGE
+DI: 15.73
−DI: 23.91

Momentum Oscillators

RSI (14): 39.59
NEUTRAL
Stoch %K: 22.98
Stoch %D: 39.66
Williams %R: -86.77

Volume & Volatility

BB Upper: $10.07
BB Lower: $8.19
NEUTRAL
OBV: 77,683,349
Vol SMA 20: 34,567
Vol ROC: 31.42%
ATR: $0.64
True Range: $0.58
HV 20: 69.1%
HV 30: 66.7%
HV 60: 63.9%

Data Summary

Data Points: 500
Last Updated:
Date Range: 2024-10-28T00:00:00 – 2026-10-26T00:00:00
AI Analysis

LLM Stock Analysis Report

SYMBOL: ATRA

Executive Summary: Overall Assessment: BEARISH (Confidence Level: 8/10) Key Drivers: Negative news sentiment, high volatility, and bearish momentum signals Primary Risks: Regulatory issues, earnings misses, and technical breakdowns Recent News Sentiment Impact: Negative headlines dominate the news landscape, driving the stock price lower

Technical Analysis:

  • Trend Direction: Short-term (1-4 weeks): Downtrend; Medium-term (1-3 months): Weak trend; Long-term (3-12 months): Uptrend
  • Support/Resistance Levels: Key price levels are:
    • Resistance: $10.15 (SMA 200)
    • Support: $7.62 (SMA 20), $6.07 (SMA 50)
  • Momentum Signals:
    • RSI interpretation: Neutral (67.00)
    • MACD signal: Bullish (1.19 / Signal: 0.12 / Histogram: 1.07) — diverging from the bearish trend
    • Bollinger Bands position: Squeeze — price near upper band, indicating potential reversal
  • Volume Analysis: Volume trends:
    • SMA 20: Increasing volume
    • On-Balance Volume (OBV): Decreasing OBV

News & Sentiment Analysis:

  • Recent Headlines Summary: Negative news headlines dominate the narrative, focusing on regulatory issues and investor lawsuits.
  • Sentiment Assessment: Negative sentiment dominates (4/5 negative headlines)
  • Catalyst Identification: No significant catalysts identified
  • Market Narrative: Negative news sentiment contradicts technical signals, indicating potential reversal

Risk & Volatility Assessment:

  • Beta Interpretation: High risk relative to market (beta 1.53 vs SPY)
  • Volatility Regime: Current volatility is higher than historical levels (HV20 253.4%, HV30 208.8%, HV60 171.2%)
  • Options Market Signals: IV rank: 0.0% (Low), put/call ratios: Bullish sentiment
  • Downside Protection: Support levels are $7.62 (SMA 20) and $6.07 (SMA 50)

Market Context & Positioning:

  • Sector Performance: Relative strength vs sector/market: Weak performance in the biotechnology sector
  • Institutional Activity: Volume patterns suggest institutional interest is decreasing
  • Correlation Analysis: Stock moves more than market (R-squared interpretation)
  • Relative Valuation: Position within trading range

Key Levels & Action Items:

  • Critical Price Levels: Support levels are $7.62 (SMA 20) and $6.07 (SMA 50); resistance is at $10.15 (SMA 200)
  • Breakout/Breakdown Levels: Technical breakdown below $7.62 could trigger a significant move
  • Time-Sensitive Catalysts: Earnings data not available; no significant catalysts identified
  • Risk Management: Stop-loss levels should be set around $8.00, with position sizing considering the high volatility

Please note that this report is based on the provided data and does not constitute buy/sell advice. The analysis aims to provide a comprehensive risk-reward assessment of the stock's performance and potential future direction.

Generated
News
All ATRA news →
Showing 1–10 of 50
Page 1 of 5
Earnings History
5 of 7 under expected move
Avg Expected Move
49.03%
Avg Actual Move
13.74%
Each row pairs the pre-earnings straddle-implied expected move with the realized close-to-close move. Sorted oldest first.
Earnings Date Timing Expected Move Actual Move Ratio Outcome
2022-01-26 Pre-Market 0.98% 0.99% 1.01x Exceeded
2022-08-08 After-Close 1.98% 29.20% 14.75x Exceeded
2023-05-08 unknown 19.14% 17.85% 0.93x Within
2023-08-08 unknown 27.08% 17.18% 0.63x Within
2023-11-01 unknown 127.34% 5.56% 0.04x Within
2024-08-12 unknown 95.24% 3.22% 0.03x Within
2024-11-12 unknown 71.43% 22.19% 0.31x Within

Earnings calendar: this week’s reports with expected vs actual moves →

ATRA Options Activity & IV Rank

Volatility Metrics

Current IV: —
7-DTE IV: —
Expected Move: $4.80
7-DTE Move: $4.80
Days to Exp: — (2024-12-20)

Options Flow

Call Volume: 14
Put Volume: 3
P/C Volume: 0.214
BULLISH
Call OI: 17
Put OI: 25
P/C OI: 1.471
Total OI: 42

ATM Options Pricing

ATM Call: $0.20
ATM Put: $4.60
Call %: 1.7%
Put %: 39.8%

Chain Summary

Chain Volume: 17
Chain OI: 42
Last Updated: 12/20/2024
Spread Scanner GPU
Full Algorithm Docs ↗

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.

Skew (Wing IV − ATM IV)
DTE:
Wing Δ:
Metric:
Wing vs ATM
IV(put wing) − IV(ATM), in vol points

How 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 side

Which 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 Dec 13 · No data
30 DTE / 10d —
— pts EXTREME
as of Dec 13 · No data

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)
Straddle Price (30 DTE)$4.80Dec 20
Beta Analysis

Risk Metrics

Beta: 1.1090
Alpha: 28.09%
Correlation: 0.0986
R-Squared: 1.0%
Stock Volatility: 143.4%
Market Volatility: 12.7%

Analysis Details

Benchmark: SPY
Data Points: 251
Period: 252 trading days
Interpretation:
Above average volatility - stock moves with market amplification
Beta & Alpha Over Time
Notable investors who own ATRA
4 of 37 tracked investors
InvestorValueShare of their portfolioRankQ/Q sharesSource
Point72 Hedge fund
Steve Cohen
$7.9M
0.01%
#834 of 1945+254.0%13F
Millennium Management Hedge fund
Izzy Englander
$146K
0.00%
#3553 of 3716-73.4%13F
Citadel Hedge fund
Ken Griffin
$117K
0.00%
#5726 of 6285new13F
Rockefeller Capital Management Family office
Rockefeller family
$0K
0.00%
#4689 of 47290.0%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

ATRA Institutional Ownership (13F)

Latest filings — 2026-09-30
Diluted shares outstanding: 14,206,250 (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.

38 filers4,693,923 shares$55.37M value33.04% of float
# Filer Shares Value % of Total % of Float Period
1 EcoR1 Capital, LLC 1,552,000 $17.82M 32.18% 10.92% 2026-06-30
2 ADAGE CAPITAL PARTNERS GP, L.L.C. 850,000 $9.76M 17.62% 5.98% 2026-06-30
3 Point72 Asset Management, L.P. 687,718 $7.90M 14.26% 4.84% 2026-06-30
4 Redmile Group, LLC 441,701 $5.07M 9.16% 3.11% 2026-06-30
5 Vanguard Group Inc Custodian 225,940 $4.09M 7.38% 1.59% 2025-12-31
6 Vanguard Capital Management LLC 247,047 $2.84M 5.12% 1.74% 2026-06-30
7 MACKENZIE FINANCIAL CORP 233,249 $2.68M 4.84% 1.64% 2026-06-30
8 BlackRock, Inc. Custodian 84,455 $969.54K 1.75% 0.59% 2026-06-30
9 Geode Capital Management, LLC Custodian 75,128 $862.92K 1.56% 0.53% 2026-06-30
10 STALEY CAPITAL ADVISERS INC 50,000 $574.00K 1.04% 0.35% 2026-06-30
11 Vanguard Fiduciary Trust Co 43,036 $494.05K 0.89% 0.30% 2026-06-30
12 ACADIAN ASSET MANAGEMENT LLC 38,845 $444.00K 0.80% 0.27% 2026-06-30
13 Jane Street Group, LLC Custodian 30,345 $348.36K 0.63% 0.21% 2026-06-30
14 State Street Corp 26,453 $303.68K 0.55% 0.19% 2026-06-30
15 Northern Trust Corp Custodian 16,591 $190.47K 0.34% 0.12% 2026-06-30
16 FMR LLC Custodian 16,238 $186.41K 0.34% 0.11% 2026-06-30
17 XTX Topco Ltd 15,303 $175.68K 0.32% 0.11% 2026-06-30
18 BRIDGEWAY CAPITAL MANAGEMENT, LLC 14,000 $160.72K 0.29% 0.10% 2026-06-30
19 Millennium Management LLC Custodian 12,680 $145.57K 0.26% 0.09% 2026-06-30
20 Citadel Advisors LLC Custodian 10,159 $116.62K 0.21% 0.07% 2026-06-30
21 Morgan Stanley Custodian 9,178 $105.37K 0.19% 0.06% 2026-06-30
22 Royal Bank of Canada Custodian 4,743 $55.00K 0.10% 0.03% 2026-06-30
23 UBS Group AG Custodian 3,979 $45.68K 0.08% 0.03% 2026-06-30
24 Vanguard Global Advisers, LLC 1,456 $16.71K 0.03% 0.01% 2026-06-30
25 SBI Securities Co., Ltd. 1,404 $11.93K 0.02% <0.01% 2026-09-30
1 filers$2.30K notional
# Filer Notional Value % of Total Period
1 Raiffeisen Bank International AG $2.30K 100.00% 2026-06-30
# Filer Notional Value % of Total Period

ATRA Insider Trading (Form 4)

Latest: 2026-09-04
Form 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
2026-09-04 Brian N Cherry Director Buy (P) +104,166 $9.60 $1000.0K EDGAR
2026-08-26 AnhCo Nguyen President and CEO Sell (S) −5,062 $8.08 -$40.9K EDGAR
2026-07-24 Redmile Group, LLC Director Mixed +390,302 — EDGAR
2026-06-15 Brian N Cherry Director Award (A) +24,000 — EDGAR
2026-06-11 William K Heiden Director Award (A) +12,000 — EDGAR
2026-06-11 Gregory Austin Ciongoli Director Award (A) +12,000 — EDGAR
2026-06-11 Matthew K Fust Director Award (A) +12,000 — EDGAR
2026-05-20 Yanina Grant-Huerta Chief Accounting Officer Sell (S) −2,414 $9.13 -$22.0K EDGAR
2026-05-20 AnhCo Nguyen President and CEO Sell (S) −5,241 $9.13 -$47.8K EDGAR
2026-05-11 James Huang Director Sell (S) −626,892 $10.10 -$6.33M EDGAR
2026-05-11 EcoR1 Capital, LLC 10%+ Owner Buy (P) +507,407 $9.35 $4.74M EDGAR
2026-03-19 Panacea Innovation Ltd 10%+ Owner Mixed +518,316 $0.00 -$0 EDGAR
2026-03-11 Yanina Grant-Huerta Chief Accounting Officer Award (A) +20,300 — EDGAR
2026-03-11 AnhCo Nguyen President and CEO Award (A) +81,100 — EDGAR
2026-03-04 Yanina Grant-Huerta Chief Accounting Officer Sell (S) −2,104 $5.08 -$10.7K 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.

ATRA Insider Holdings

17 insiders · @ $8.35
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 EcoR1 Capital, LLC 10%+ Owner 1,552,000 $12.96M $4.74M 1 2026-05-11
2 Gregory Austin Ciongoli Director 1,221,395 $10.20M $0 1 2026-06-11
3 Adiumentum Capital Fund I LP Director 1,209,395 $10.10M $0 1 2025-05-16
4 Redmile Group, LLC Director 636,852 $5.32M $0 1 2026-07-24
5 Panacea Innovation Ltd 10%+ Owner 307,899 $2.57M -$605.3K 3 2026-03-19
6 James Huang Director 307,894 $2.57M -$4.99M 3 2026-05-11
7 Brian N Cherry Director 166,486 $1.39M $1000.0K 2 2026-09-04
8 AnhCo Nguyen President and CEO 132,775 $1.11M -$315.6K 16 2026-08-26
9 Pascal Touchon President and CEO 77,955 $650.9K -$1.72M 30 2025-06-12
10 Eric J Hyllengren EVP, CFO and COO 56,231 $469.5K -$87.6K 11 2025-04-02
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.

ATRA Board & Officers

As of SEC filings through Sep 4, 2026

Directors 12

Officers 3

10% owners 6

Changes in the last 10 years (63)
Jun 26, 2026Kevin G Sarney became Interim CFO
Jun 11, 2026Brian N Cherry became a director
May 7, 2026EcoR1 Capital, LLC became a 10% owner
Sep 2, 2025The company announced the departure of Pascal Touchon from the board in an SEC filing
Sep 2, 2025The company announced the departure of Maria Grazia Roncarolo from the board in an SEC filing
Sep 2, 2025The company announced the departure of Ameet Mallik from the board in an SEC filing
May 16, 2025Redmile Group, LLC became a director
May 16, 2025Panacea Innovation Ltd became a 10% owner
May 16, 2025Nachiappan Subramanian became a director
May 16, 2025Jeremy Green became a director
May 16, 2025James Huang became a director
May 16, 2025James Huang became a 10% owner
Apr 2, 2025Eric J Hyllengren reported in an SEC filing no longer being EVP, CFO and COO
Mar 31, 2025Yanina Grant-Huerta became Chief Accounting Officer
Nov 20, 2024Jill Henrich listed as EVP, Chief Regulatory Officer (previously EVP, Global Head RA & Quality) in SEC filings
Nov 20, 2024Eric J Hyllengren listed as EVP, CFO and COO (previously EVP, CFO) in SEC filings
Sep 11, 2024AnhCo Nguyen listed as President and CEO (previously EVP, Chief Sci. & Tech Officer) in SEC filings
Sep 11, 2024AnhCo Nguyen first listed as a director in an SEC filing
Sep 3, 2024Gregory Austin Ciongoli became a director
Sep 3, 2024Gregory Austin Ciongoli became a 10% owner
Not reported recently (11)
  • Jill Henrich · Last reported as EVP, Chief Regulatory Officer in an SEC filing dated Mar 5, 2025
  • Amar Murugan · Last reported as EVP, Chief Legal Officer in an SEC filing dated Aug 20, 2024
  • Isaac E. Ciechanover · Last reported as a director in an SEC filing dated May 31, 2019
  • Dietmar Berger · Last reported as Global Head of R&D in an SEC filing dated May 8, 2019
  • Mina Kim · Last reported as Senior VP & General Counsel in an SEC filing dated Apr 10, 2019
  • Derrell Porter · Last reported as SVP, Head of Global Commercial in an SEC filing dated Mar 27, 2019
  • Joel S Marcus · Last reported as a director in an SEC filing dated Mar 19, 2019
  • Christopher Haqq · Last reported as EVP, R&D & Chief Scientific Of in an SEC filing dated Feb 19, 2019
  • Gad Soffer · Last reported as EVP & Chief Strategy Officer in an SEC filing dated Sep 25, 2018
  • Mitchall G. Clark · Last reported as EVP & Chief R & QA Officer in an SEC filing dated May 21, 2018
  • John McGrath · Last reported as EVP & Chief Financial Officer in an SEC filing dated Mar 20, 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.

ATRA Proposed Insider Sales (Form 144)

Latest: 2026-08-26
Last 30d: 0 filings  ·  Last 90d: 1 filing · $42K notice value · 1 unique filer

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: Nguyen AnhCo (1, $42K)
Filed Filer Role Shares Notice Value Planned Sale Broker Plan Link
2026-08-26 Nguyen AnhCo Director, Officer 5,062 $42.3K 2026-08-17 Morgan Stanley Smith Barney LLC — EDGAR
2026-05-18 Nguyen AnhCo Director, Officer 5,981 $62.7K 2026-05-18 Morgan Stanley Smith Barney LLC — EDGAR
2026-05-18 Grant-Huerta Yanina Officer 2,754 $28.9K 2026-05-18 Morgan Stanley Smith Barney LLC — EDGAR
2026-05-07 Panacea Innovation Ltd 10% Stockholder 313,446 $3.17M 2026-05-07 Cantor Fitzgerald — EDGAR
2026-03-02 Nguyen AnhCo Director, Officer 3,355 $18.2K 2026-03-02 Morgan Stanley Smith Barney LLC — EDGAR
2026-03-02 Grant-Huerta Yanina Officer 2,355 $12.8K 2026-03-02 Morgan Stanley Smith Barney LLC — EDGAR
2026-01-12 Panacea Innovation Ltd 10% Stockholder 40,000 $235.2K 2026-01-12 Cantor Fitzgerald — EDGAR
2025-11-17 Nguyen AnhCo Director, Officer 3,346 $46.0K 2025-11-17 Morgan Stanley Smith Barney LLC — EDGAR
2025-11-17 Grant-Huerta Yanina Officer 2,069 $28.5K 2025-11-17 Morgan Stanley Smith Barney LLC — EDGAR
2025-08-18 Nguyen AnhCo Director, Officer 3,346 $41.1K 2025-08-18 Morgan Stanley Smith Barney LLC — 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
4 ETFs hold ATRA
4 shown · $2.21M total exposure · 0.01% AUM-weighted avg weight
# ETF Provider Weight $ Exposure ETF AUM As Of
1 VTI Vanguard Morningstar Total Stock Market ETF Vanguard 0.00% $1.3M — 2026-09-30
2 VXF Vanguard Extended Market ETF Vanguard 0.00% $703,443 — 2026-09-30
3 IWC iShares Micro-Cap ETF iShares (BlackRock) 0.01% $160,143 $1.2B 2026-10-23
4 DFAS Dimensional US Small Cap ETF Dimensional 0.00% $1,160 — 2026-10-23
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
—
TTM Diluted EPS
$-1.17
TTM Revenue
$6.19M
TTM Net Income
$-16.69M
TTM Op. Cash Flow
$-21.89M
Quarterly figures (12 quarters)
QuarterPeriod EndRevenueNet IncomeDiluted EPSOp. Cash Flow
Q2 '262026-06-30$630.00K$-4.83M$-0.32$-3.34M
Q1 '262026-03-31$516.00K$-4.14M$-0.29$-3.07M
Q4 '252025-12-31$1.59M$-3.41M$-0.36$-5.70M
Q3 '252025-09-30$3.45M$-4.30M$-0.32$-9.79M
Q2 '252025-06-30$17.57M$2.39M$0.19$-7.32M
Q1 '252025-03-31$98.15M$38.01M$3.50$-28.14M
Q4 '242024-12-31$32.75M$-12.69M$-0.07$-24.47M
Q3 '242024-09-30$40.19M$-21.91M$-2.93$-3.99M
Q2 '242024-06-30$28.64M$-19.05M$-3.10$-10.64M
Q1 '242024-03-31$27.36M$-31.75M$-5.65$-29.61M
Q4 '232023-12-31$4.25M$-60.45M$-13.92$-50.41M
Q3 '232023-09-30$2.14M$-69.80M$-16.40$-51.35M
Q2 2026 • period ending 2026-06-30 • filed 2026-08-12
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
—
P/B
—
P/S
19.15
EV/EBITDA
—
EV/Sales
18.63
ROE
—
ROA
-79.4%
Div Yield
0.00%
FCF Yield
-18.46%
Debt/Equity
—
Current Ratio
—
Market Cap
$118.62M
as of 2026-10-26
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
321.79K
SI % of Float
10.30%
Days to Cover
8.11
Short Vol Ratio
51.0%
Free Float
3.12M
Float %
34.7%
Short interest 2026-09-30 • Short volume 2026-10-26 • Float 2026-08-14