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 −$422.6M, making them a net seller over the disclosed history. Current disclosed insider exposure totals $335.0M 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.
Charts
Trading activity, where the exposure sits, and each trade against the stock price.
LYB price and trades
Daily close with each Form 4 filing on this company marked: green = open-market buy, red = open-market sale, purple = grants, exercises, gifts and other non-market transactions. Marker size scales with the dollar value.
Shares held
Shares owned after each reported transaction on this company (direct holdings as reported).
Open-market buying and selling
by monthDollar value of open-market purchases (code P, up) and sales (code S, down) across all companies, by filing month. Grants, exercises and gifts are excluded.
Exposure by company
latestMost recently reported shares × current price. Faded bars (*) have had no filing in 3 years, so the person may no longer hold them. Click a bar to chart that company.
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 | — | $31.79 | — | $0 | 1 | 2026-04-20 |
| IRON | 10%+ Owner | 3,558,426 | $81.26 | $289.16M | $10.00M | 2 | 2024-06-20 |
| Day One Biopharmaceuticals, Inc. (DAWN) Delisted | 11,453,868 | $21.53 | $246.60M | $10.00M | 1 | 2023-06-12 | |
| LYB | 10%+ Owner | 770,038 | $59.50 | $45.82M | -$442.06M | 8 | 2022-12-05 |
| Neon Therapeutics, Inc. (NTGN) Delisted | 2,752,480 | — | — | -$552.8K | 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) | +416,667 | $15.00M | EDGAR |
| 2023-06-12 | Day One Biopharmaceuticals, Inc. (DAWN) Delisted | Buy (P) | +769,230 | $10.00M | EDGAR |
| 2023-02-17 | IRON | Buy (P) | +434,783 | $10.00M | EDGAR |
| 2022-12-05 | LYB | Sell (S) | −1,428,298 | -$121.30M | EDGAR |
| 2022-11-18 | LYB | Sell (S) | −27 | -$2.3K | EDGAR |
| 2021-05-06 | LYB | Sell (S) | −927,000 | -$100.21M | EDGAR |
| 2021-03-09 | LYB | Other (J) | — | $0 | EDGAR |
| 2021-03-03 | LYB | Mixed | −975,293 | -$100.76M | EDGAR |
| 2021-02-24 | LYB | Sell (S) | −350,000 | -$36.18M | 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.