PETER Y CHUNG
CIK 1239366 · last filed 2026-05-18
"Disclosed insider exposure" sums this person's most-recently-reported share counts across each company they're an insider in, multiplied by the current underlying price. It is not net worth — it misses retail holdings, private investments, real estate, index funds, and any company where the person isn't an SEC-reporting insider. For informational purposes only.
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Disclosed Exposure
$7.52M
Companies
8
Total Filings
75
Lifetime Open-Market Net
-$1.62B
Holdings By Company
Latest on-record share count from this person's most recent non-derivative Form 4 transaction in each company. Disclosed exposure = shares × current underlying price.
| Symbol | Role | Shares | Price | Disclosed Exposure | Lifetime OM Net | Filings | Latest Filed |
|---|---|---|---|---|---|---|---|
| MTSI | Director | 6,781 | $228.71 | $1.55M | -$395.70M | 27 | 2026-05-18 |
| ATEN | Director | 207,298 | $28.78 | $5.97M | -$88.78M | 19 | 2026-04-24 |
| Acacia Communications, Inc. (ACIA) Delisted | Director | 14,600 | — | — | -$164.15M | 7 | 2019-05-17 |
| Casa Systems Inc (CASA) Delisted | Director | 34,124,480 | $0.04 | $1.19M | -$235.88M | 1 | 2018-04-30 |
| Ubiquiti Inc. (UBNT) Delisted | Director | 4,822,815 | — | — | -$738.25M | 10 | 2013-09-16 |
| NightHawk Radiology Holdings Inc (NHWK) Delisted | Director | 0 | $0.41 | $0 | $0 | 7 | 2010-12-23 |
| SeaBright Holdings, Inc. (SBX) Delisted | Director | 23,096 | — | — | $0 | 1 | 2009-05-21 |
| SeaBright Holdings, Inc. (SEAB) Delisted | Director | 18,611 | — | — | $0 | 1 | 2008-05-22 |
Recent Filings · Page 2 of 8
75 filingsInsider activity across all companies, newest first. Form 4 rows are post-trade confirmations (buys, sells, grants, exercises). Notice (144) rows are pre-trade notices of intent to sell restricted or control stock under Rule 144 — they may not all execute. Compare adjacent dates to see which notices became actual sales.
| Filed | Symbol | Action | Net Shares | Net $ | Link |
|---|---|---|---|---|---|
| 2024-03-11 | MTSI | Grant (A) | +2,138 | $0 | EDGAR |
| 2023-05-18 | ATEN | Grant (A) | +14,104 | $0 | EDGAR |
| 2023-03-07 | MTSI | Grant (A) | +2,244 | $0 | EDGAR |
| 2022-11-17 | ATEN | Sell (S) | −1,500,000 | -$25.80M | EDGAR |
| 2022-09-09 | ATEN | Disp (D) | −3,500,000 | -$44.62M | EDGAR |
| 2022-08-10 | MTSI | Sell (S) | −850,311 | -$50.17M | EDGAR |
| 2022-06-28 | ATEN | Grant (A) | +10,316 | $0 | EDGAR |
| 2022-03-07 | MTSI | Grant (A) | +2,768 | $0 | EDGAR |
| 2021-12-10 | ATEN | Sell (S) | −700,000 | -$10.54M | EDGAR |
| 2021-05-03 | ATEN | Grant (A) | +16,949 | $0 | EDGAR |
Form 4 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 (see filing footnote). Only P / S codes carry directional signal.
Notice (144 / 144/A): Form 144 is a notice of intent to sell restricted/control stock under Rule 144, filed before the sale; 144/A is an amendment. Many notices are pre-scheduled under Rule 10b5-1 plans. A Form 4 with code S typically follows within a few days when the planned sale executes; missing follow-up Form 4s suggest the notice was cancelled or modified.
Notice (144 / 144/A): Form 144 is a notice of intent to sell restricted/control stock under Rule 144, filed before the sale; 144/A is an amendment. Many notices are pre-scheduled under Rule 10b5-1 plans. A Form 4 with code S typically follows within a few days when the planned sale executes; missing follow-up Form 4s suggest the notice was cancelled or modified.