Caley Castelein - SEC Form 4 Insider Trading Activity
Summary
Updated Aug 3, 2026
Caley Castelein has filed 2 SEC Form 4 filings across 1 company in the last 90 days.
Profile
Caley Castelein is a corporate insider at Whitehawk Therapeutics, Inc. (WHWK). Castelein has also held reporting roles at Tourmaline Bio, Inc. (TRML). Castelein has reported 4 insider filings with the SEC since 2025. The most recent filing was in June 2026.
| Role | Insider |
|---|---|
| Notability | 20/100 |
Board memberships
- Whitehawk Therapeutics, Inc.
- Tourmaline Bio, Inc.
Trading Pattern
InsiderAlpha's records for Caley Castelein go back to 2025: 4 primary Form 4 filings, an average of 2.0 per year. No transaction on record carries a Rule 10b5-1 flag - the filings look discretionary rather than pre-scheduled, which makes their timing more informative as a signal.
Career & Filing History
Every role Caley Castelein has reported on a Form 4, reconstructed from the filings themselves - reporting insiders must state their relationship to the issuer (officer title, director seat, or 10% ownership) on every filing.
- Insider at Whitehawk Therapeutics, Inc. (WHWK) - 2 filings, 2026
- Insider at Tourmaline Bio, Inc. (TRML) - 2 filings, 2025
Recent Transactions
| Date | Ticker | Company | Code | Shares | Price | Value |
|---|---|---|---|---|---|---|
| 2026-05-18 | WHWK | Whitehawk Therapeutics, Inc. | A - Grant or award | 255.1K | $3.92 | $1000K |
| 2025-10-28 | TRML | Tourmaline Bio, Inc. | J - Other acquisition / disposition | 431.9K | - | |
| 2025-10-28 | TRML | Tourmaline Bio, Inc. | J - Other acquisition / disposition | 516.0K | - | |
| 2025-10-15 | TRML | Tourmaline Bio, Inc. | G - Bona-fide gift | 522 | $0.00 |
Companies - Last 90 Days
- Whitehawk Therapeutics, Inc. (WHWK) - 2 filings, last 2026-06-15
Other Insiders Active in the Same Stocks
Insiders who reported open-market trades at the companies Caley Castelein has recently filed at. Multiple unrelated insiders buying the same stock within a short window - cluster buying - has historically been one of the strongest Form 4 signals.
- David James Lennon - $1.06M of WHWK open-market activity in the last 12 months
- Scott M. Giacobello - $891K of WHWK open-market activity in the last 12 months
- Bryan Ball - $635K of WHWK open-market activity in the last 12 months
More Notable Insiders
Other corporate insiders with significant SEC Form 4 track records on InsiderAlpha:
- Kevin T. Callahan
- Michael Cannon-Brookes
- CANTOR FITZGERALD & CO.
- Fitzgerald, L. P. Cantor
- Sabas D. Carrillo
- Jonathan P. Carroll
- CASCADE INVESTMENT, L.L.C.
- Casdin Capital, LLC
Frequently Asked Questions
Who is Caley Castelein?
Caley Castelein is a corporate insider at Whitehawk Therapeutics, Inc. (WHWK). Castelein has also held reporting roles at Tourmaline Bio, Inc. (TRML). Castelein has reported 4 insider filings with the SEC since 2025. The most recent filing was in June 2026.…
How many SEC Form 4 filings has Caley Castelein submitted recently?
2 primary Form 4 filings in the last 90 days, covering 1 company.
Where can I see all of Caley Castelein's SEC filings?
All Form 4 filings, transaction values, and 10b5-1 plan flags are listed on this page and updated in real time as new SEC EDGAR filings are processed.
Learn More
Open the live Caley Castelein profile on InsiderAlpha for real-time alerts, AI-scored trade ideas, and full transaction history.