ATLAS VENTURE ASSOCIATES X, L.P.
CIK 1742766 · last filed 2024-03-13
"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.
Loading insider history…
Disclosed Exposure
$888.55M
Companies
6
Total Filings
12
Lifetime Open-Market Net
-$382.95M
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 |
|---|---|---|---|---|---|---|---|
| KYMR | 10%+ Owner | 5,812,200 | $109.62 | $637.13M | -$184.55M | 5 | 2024-03-13 |
| IRON | 10%+ Owner | 2,347,367 | $81.21 | $190.63M | -$183.18M | 2 | 2023-12-14 |
| Generation Bio Co. (GBIO) Delisted | 10%+ Owner | 911,194 | $5.34 | $4.87M | -$14.46M | 2 | 2021-04-14 |
| Tectonic Therapeutic, Inc. (AVRO) Delisted | 10%+ Owner | 309,171 | $16.80 | $5.19M | $0 | 1 | 2020-02-18 |
| Dianthus Therapeutics, Inc. /DE/ (MGTA) Delisted | 10%+ Owner | 257,320 | $11.19 | $2.88M | -$763.2K | 1 | 2019-03-22 |
| REPL | 10%+ Owner | 4,453,386 | $13.65 | $60.79M | $0 | 1 | 2018-07-26 |
Recent Filings · Page 2 of 2
12 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 |
|---|---|---|---|---|---|
| 2019-03-22 | Dianthus Therapeutics, Inc. /DE/ (MGTA) Delisted | Mixed | −2,179,500 | -$763.2K | EDGAR |
| 2018-07-26 | REPL | Conv (C) | +13,360,158 | $0 | EDGAR |
Showing 11–12 of 12
Prev
Page 2 of 2
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.