Len Blavatnik
CIK 1326628 · last filed 2026-04-20
Len Blavatnik is a corporate insider who has filed 15 SEC Form 4 insider transactions across 6 companies since 2014. The most recent filing, for WMG, was dated Apr 20, 2026. Across all open-market trades the lifetime net is −$2.13B, making them a net seller over the disclosed history. Current disclosed insider exposure totals $1.21B across reported positions. 100 SEC filings were submitted jointly with ACCESS INDUSTRIES MANAGEMENT, LLC.
"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.
$1.21B
6
15
-$2.13B
Filer Profile
730 FIFTH AVENUE
NEW YORK, NY 10019
Holdings By Company
| Symbol | Role | Shares | Price | Disclosed Exposure | Lifetime OM Net | Filings | Latest Filed |
|---|---|---|---|---|---|---|---|
| WMG | 10%+ Owner | — | $27.14 | — | $0 | 1 | 2026-04-20 |
| IRON | 10%+ Owner | 3,558,426 | $65.24 | $232.15M | $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 | $58.14 | $974.81M | -$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
15 filings| Filed | Symbol | Action | Net Shares | Net $ | Link |
|---|---|---|---|---|---|
| 2026-04-20 | WMG | Other (J) | — | $0 | EDGAR |
| 2024-06-20 | IRON | Grant (A) | +1,666,668 | $60.00M | EDGAR |
| 2023-06-12 | Day One Biopharmaceuticals, Inc. (DAWN) Delisted | Buy (P) | +3,076,920 | $40.00M | EDGAR |
| 2023-02-17 | IRON | Buy (P) | +1,739,132 | $40.00M | EDGAR |
| 2022-12-05 | LYB | Sell (S) | −7,141,490 | -$606.51M | EDGAR |
| 2022-11-18 | LYB | Sell (S) | −135 | -$11.7K | EDGAR |
| 2021-05-06 | LYB | Sell (S) | −4,635,000 | -$501.07M | EDGAR |
| 2021-03-09 | LYB | Other (J) | — | $0 | EDGAR |
| 2021-03-03 | LYB | Mixed | −4,876,465 | -$503.82M | EDGAR |
| 2021-02-24 | LYB | Sell (S) | −1,750,000 | -$180.91M | EDGAR |
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.