Yoon Ah OH
CIK 1889970 · SVP, Gen Counsel & Corp Sec · 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
$5.41M
Companies
1
Total Filings
24
Lifetime Open-Market Net
-$770.4K
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 |
|---|---|---|---|---|---|---|---|
| ONTO | SVP, Gen Counsel & Corp Sec | 21,110 | $256.37 | $5.41M | -$770.4K | 22 | 2026-05-18 |
Recent Filings · Page 2 of 3
24 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 |
|---|---|---|---|---|---|
| 2024-05-17 | ONTO | Tax (F) | −603 | -$140.9K | EDGAR |
| 2024-03-18 | ONTO | Notice (144) | −1,685 | -$303.3K | EDGAR |
| 2024-03-18 | ONTO | Sell (S) | −4,370 | -$770.4K | EDGAR |
| 2024-03-15 | ONTO | Notice (144) | −2,685 | -$467.1K | EDGAR |
| 2024-03-05 | ONTO | Grant (A) | +1,883 | $0 | EDGAR |
| 2024-02-16 | ONTO | Tax (F) | −493 | -$85.3K | EDGAR |
| 2024-02-12 | ONTO | Mixed | +1,327 | -$251.1K | EDGAR |
| 2023-10-26 | ONTO | Tax (F) | −795 | -$88.4K | EDGAR |
| 2023-05-16 | ONTO | Grant (A) | +3,746 | $0 | EDGAR |
| 2023-02-16 | ONTO | Grant (A) | +3,955 | $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.