Atlas Venture Opportunity Fund II, L.P.
CIK 1885327 · last filed 2025-02-10
"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
$219.22M
Companies
2
Total Filings
48
Lifetime Open-Market Net
-$95.58M
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.
Recent Filings · Page 5 of 5
48 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 |
|---|---|---|---|---|---|
| 2025-10-01 | SION | Notice (144) | −35 | -$1.0K | EDGAR |
| 2025-09-30 | SION | Notice (144) | −2,149 | -$63.4K | EDGAR |
| 2025-09-29 | SION | Notice (144) | −11,468 | -$331.9K | EDGAR |
| 2025-02-10 | SION | Mixed | +22,164,120 | $6.48M | EDGAR |
| 2024-03-01 | DYN | Notice (144) | −50,000 | -$1.34M | EDGAR |
| 2024-02-23 | DYN | Notice (144) | −100,000 | -$2.24M | EDGAR |
| 2024-02-23 | DYN | Sell (S) | −4,507,101 | -$102.06M | EDGAR |
| 2024-01-23 | IRON | Notice (144) | −20,000 | -$1.36M | EDGAR |
Showing 41–48 of 48
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Page 5 of 5
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.