FWONA (Liberty Media Corporation Series A Liberty Formula One Common Stock)
Insider Trading Activity
Every open-market purchase and sale reported by FWONA officers, directors and 10%+ beneficial owners on SEC Form 4, which must be filed within two business days of the transaction. Sales often reflect scheduled 10b5-1 plans or tax withholding rather than a directional view, so read counts alongside the size and the filer.
Market data may be delayed, incomplete, or inaccurate. Not a recommendation to buy, sell, or hold any security. Verify quotes with your broker before trading. See Terms §17.
| Filed | Insider | Role | Type | Shares | Value |
|---|---|---|---|---|---|
| 2026-03-31 | JOHN C MALONE | 10%+ Owner | Sell | — | — |
| 2024-09-12 | BERKSHIRE HATHAWAY INC | 10%+ Owner | J | — | — |
| 2024-09-12 | BERKSHIRE HATHAWAY INC | 10%+ Owner | J | — | — |
| 2024-06-17 | BERKSHIRE HATHAWAY INC | 10%+ Owner | Sell | — | — |
| 2024-05-01 | BERKSHIRE HATHAWAY INC | 10%+ Owner | Buy | — | — |
| 2024-04-26 | BERKSHIRE HATHAWAY INC | 10%+ Owner | Buy | — | — |
| 2024-04-26 | BERKSHIRE HATHAWAY INC | 10%+ Owner | Buy | — | — |
| 2024-04-12 | BERKSHIRE HATHAWAY INC | 10%+ Owner | Buy | — | — |
| 2024-04-12 | BERKSHIRE HATHAWAY INC | 10%+ Owner | Buy | — | — |
| 2024-04-08 | BERKSHIRE HATHAWAY INC | 10%+ Owner | Buy | — | — |
| 2024-04-08 | BERKSHIRE HATHAWAY INC | 10%+ Owner | Buy | — | — |
| 2024-03-28 | BERKSHIRE HATHAWAY INC | 10%+ Owner | Buy | — | — |
| 2024-03-28 | BERKSHIRE HATHAWAY INC | 10%+ Owner | Buy | — | — |
| 2024-03-25 | BERKSHIRE HATHAWAY INC | 10%+ Owner | Buy | — | — |
| 2024-03-25 | BERKSHIRE HATHAWAY INC | 10%+ Owner | Buy | — | — |
| 2024-03-12 | BERKSHIRE HATHAWAY INC | 10%+ Owner | Buy | — | — |
| 2024-03-12 | BERKSHIRE HATHAWAY INC | 10%+ Owner | Buy | — | — |
| 2024-03-06 | BERKSHIRE HATHAWAY INC | 10%+ Owner | Buy | — | — |
| 2024-03-06 | BERKSHIRE HATHAWAY INC | 10%+ Owner | Buy | — | — |
| 2024-02-01 | BERKSHIRE HATHAWAY INC | 10%+ Owner | Buy | — | — |
| 2024-02-01 | BERKSHIRE HATHAWAY INC | 10%+ Owner | Buy | — | — |
| 2024-01-25 | BERKSHIRE HATHAWAY INC | 10%+ Owner | Buy | — | — |
| 2024-01-25 | BERKSHIRE HATHAWAY INC | 10%+ Owner | Buy | — | — |
| 2024-01-17 | BERKSHIRE HATHAWAY INC | 10%+ Owner | Buy | — | — |
| 2024-01-17 | BERKSHIRE HATHAWAY INC | 10%+ Owner | Buy | — | — |
| 2021-11-03 | BERKSHIRE HATHAWAY INC | 10%+ Owner | Buy | — | — |
| 2020-06-19 | BERKSHIRE HATHAWAY INC | 10%+ Owner | J | — | — |
| 2020-06-09 | BERKSHIRE HATHAWAY INC | 10%+ Owner | X | — | — |
| 2020-06-03 | BERKSHIRE HATHAWAY INC | 10%+ Owner | Buy | — | — |
| 2020-05-29 | BERKSHIRE HATHAWAY INC | 10%+ Owner | Buy | — | — |
| 2020-05-26 | BERKSHIRE HATHAWAY INC | 10%+ Owner | MIXED | — | — |
Form 4 reports a change in beneficial ownership by an officer, director or 10%+ holder, and must be filed within two business days of the transaction — so this is close to real time, unlike the 45-day-lagged 13F institutional data.
Transaction codes matter more than the raw buy/sell count. Code P is an open-market purchase — an insider choosing to buy with their own money, which is the signal most research treats as informative. Code S is a sale, but sales are frequently pre-scheduled under a 10b5-1 plan or cover tax withholding on vesting equity, so a run of sales often says nothing directional. Codes A and M are grants and option exercises rather than open-market decisions.
Full filing history and per-insider positions are on the FWONA quote page; the site-wide leaderboard is on the insider transactions hub.