Len Blavatnik
CIK 1326628 · last filed 2026-04-20
"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
$1.32B
Companies
6
Total Filings
15
Lifetime Open-Market Net
-$2.13B
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 |
|---|---|---|---|---|---|---|---|
| WMG | 10%+ Owner | — | $28.46 | — | $0 | 1 | 2026-04-20 |
| IRON | 10%+ Owner | 3,558,426 | $67.99 | $241.94M | $40.00M | 2 | 2024-06-20 |
| Day One Biopharmaceuticals, Inc. (DAWN) Delisted | 11,453,868 | $21.53 | $246.60M | $40.00M | 1 | 2023-06-12 | |
| LYB | 10%+ Owner | 16,766,672 | $64.58 | $1.08B | -$2.21B | 8 | 2022-12-05 |
| Neon Therapeutics, Inc. (NTGN) Delisted | 2,752,480 | — | — | -$2.76M | 1 | 2020-03-25 | |
| Loxo Oncology, Inc. (LOXO) Delisted | 10%+ Owner | 1,368,339 | — | — | $0 | 1 | 2014-08-06 |
Recent Filings · Page 2 of 2
15 filingsForm 4 transactions across all companies, newest first.
| Filed | Symbol | Action | Net Shares | Net $ | Link |
|---|---|---|---|---|---|
| 2021-02-17 | LYB | Sell (S) | −1,968,900 | -$188.25M | EDGAR |
| 2020-12-08 | LYB | Sell (S) | −2,593,455 | -$229.74M | EDGAR |
| 2020-03-25 | Neon Therapeutics, Inc. (NTGN) Delisted | Sell (S) | −1,260,220 | -$2.76M | EDGAR |
| 2014-08-06 | Loxo Oncology, Inc. (LOXO) Delisted | Conv (C) | +5,473,356 | $0 | EDGAR |
| 2007-05-08 | — | Other (J) | +3,531,089 | $0 |
Showing 11–15 of 15
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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.