Baker Bros. Advisors LP
CIK 1263508 · View on SEC EDGAR ↗
Activist
First SEC filing: May 26, 2026 · Latest: May 26, 2026
On this page
- Institution The 13F filer entity this person is associated with.
- Insider at Companies where this person is a reporting insider.
- Insider transactions Every share this person bought or sold, from Form 4 filings.
- Derivatives Options and other derivative holdings reported by this person.
- Initial holdings The stakes this person held when they first started reporting.
Institution
Insider at
Insider transactions
0 buys (P)
0 sells (S)
Net:
$0
last 12 months, based on the transactions shown below
Price change vs current quote, split-adjusted for corporate actions since the filing — not benchmarked, not annualized, not size-weighted
| Date | Ticker | Code | Shares | Price | Value | Owned after | Δ own | A/D | vs now |
|---|---|---|---|---|---|---|---|---|---|
| March 21, 2024 | MDGL | P | 970,951 | $260.00 | $252,447,260 | 2,493,602 Indirect | +63.77% | Acquired | 106.2% (price as of 2026-08-20) |
| March 21, 2024 | MDGL | P | 86,741 | $260.00 | $22,552,660 | 212,188 Indirect | +69.15% | Acquired | 106.2% (price as of 2026-08-20) |
P = Open-market purchase · S = Sale · A = Grant/award · M = Option exercise · G = Gift · F = Tax withholding
Insider transactions are not a recommendation; sales are often driven by liquidity or tax reasons.
Derivative holdings (Form 4 Table II)
Options, RSUs and convertible securities reported on Form 4 Table II.
| Date | Ticker | Security | Underlying | Exercise price | Expiration | Shares | A/D |
|---|---|---|---|---|---|---|---|
| March 21, 2024 | MDGL | Common Stock Warrant (right to buy) | Common Stock (970,951) | $0.00 | — | 970,951 | Acquired |
| March 21, 2024 | MDGL | Common Stock Warrant (right to buy) | Common Stock (86,741) | $0.00 | — | 86,741 | Acquired |
Exercise/conversion price is blank when not applicable (e.g. RSUs).
Initial ownership (Form 3) 10 holdings
Securities held when first becoming an insider, per SEC Form 3.
| Date | Ticker | Security | Shares | Ownership |
|---|---|---|---|---|
| April 1, 2024 | KYMR | Common Stock | 478,943 | Indirect |
| April 1, 2024 | KYMR | Common Stock | 5,516,985 | Indirect |
| April 1, 2024 | KYMR | Prefunded Warrants [F5]→ Common Stock (571,429) | 571,429 | Indirect |
| April 1, 2024 | KYMR | Prefunded Warrants [F5]→ Common Stock (7,379,066) | 7,379,066 | Indirect |
| April 23, 2012 | INCY | Common Stock | 0 | Indirect |
| April 23, 2012 | INCY | 4.75% Convertible Senior Note due 2015 [F5]→ Common Stock [F2,F3,F4,F5] | — | Indirect |
| April 23, 2012 | XOMA | Common Stock | 0 | Indirect |
| April 23, 2012 | XOMA | Warrants→ Common Stock | — | Indirect |
| April 23, 2012 | BCRX | Common Stock | 0 | Indirect |
| April 23, 2012 | BCRX | Warrants→ Common Stock | — | Indirect |