Frank Stokes - SEC Form 4 Insider Trading Activity
Summary
Updated Aug 4, 2026
Frank Stokes has filed 1 SEC Form 4 filing across 1 company in the last 90 days - selling. Lifetime open-market sales: $756K.
Profile
Frank Stokes holds the role of Director at EXAGEN INC. (XGN). Stokes's filing history also covers CASTLE BIOSCIENCES INC (CSTL). Stokes has reported 9 insider filings with the SEC since 2024. The most recent filing was in June 2026.
| Role | Director |
|---|---|
| Notability | 34/100 |
Board memberships
- EXAGEN INC.
- CASTLE BIOSCIENCES INC
Reported roles
- Director
- Chief Financial Officer
Awards & honors
- Chief Financial Officer at Castle Biosciences
- Director at Exagen Inc
Trading Pattern
InsiderAlpha's records for Frank Stokes go back to 2024: 9 primary Form 4 filings, an average of 3.0 per year. 14 recorded transactions carry a Rule 10b5-1 flag, meaning they were pre-scheduled under a written trading plan rather than discretionary.
Career & Filing History
Every role Frank Stokes 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.
- Director at EXAGEN INC. (XGN) - 2 filings, 2025 to 2026
- Chief Financial Officer at CASTLE BIOSCIENCES INC (CSTL) - 7 filings, 2024 to 2026
Recent Transactions
| Date | Ticker | Company | Code | Shares | Price | Value |
|---|---|---|---|---|---|---|
| 2026-03-09 | CSTL | CASTLE BIOSCIENCES INC | S - Open-market sale [10b5-1] | 6.0K | $27.98 | $168K |
| 2026-03-05 | CSTL | CASTLE BIOSCIENCES INC | M - Option exercise [10b5-1] | 3.8K | $3.38 | $13K |
| 2026-03-05 | CSTL | CASTLE BIOSCIENCES INC | F - Tax withholding / forfeiture [10b5-1] | 10.7K | $28.17 | $302K |
| 2026-03-05 | CSTL | CASTLE BIOSCIENCES INC | M - Option exercise [10b5-1] | 24.1K | - | |
| 2026-03-05 | CSTL | CASTLE BIOSCIENCES INC | F - Tax withholding / forfeiture [10b5-1] | 3.6K | $27.57 | $100K |
| 2026-03-05 | CSTL | CASTLE BIOSCIENCES INC | S - Open-market sale [10b5-1] | 1.7K | $27.81 | $47K |
| 2026-03-05 | CSTL | CASTLE BIOSCIENCES INC | S - Open-market sale [10b5-1] | 5.3K | $27.32 | $145K |
| 2026-01-14 | CSTL | CASTLE BIOSCIENCES INC | A - Grant or award | 8.1K | $0.00 | |
| 2025-11-13 | CSTL | CASTLE BIOSCIENCES INC | S - Open-market sale [10b5-1] | 5.4K | $35.08 | $189K |
| 2025-08-08 | CSTL | CASTLE BIOSCIENCES INC | F - Tax withholding / forfeiture | 4.4K | $19.36 | $84K |
| 2025-08-08 | CSTL | CASTLE BIOSCIENCES INC | M - Option exercise | 9.7K | $0.00 | |
| 2024-12-11 | CSTL | CASTLE BIOSCIENCES INC | F - Tax withholding / forfeiture | 2.8K | $29.63 | $82K |
| 2024-12-11 | CSTL | CASTLE BIOSCIENCES INC | M - Option exercise | 6.2K | - | |
| 2024-12-11 | CSTL | CASTLE BIOSCIENCES INC | F - Tax withholding / forfeiture | 900 | $29.63 | $27K |
| 2024-12-11 | CSTL | CASTLE BIOSCIENCES INC | M - Option exercise | 2.0K | - | |
| 2024-12-11 | CSTL | CASTLE BIOSCIENCES INC | F - Tax withholding / forfeiture | 6.6K | $30.91 | $203K |
| 2024-12-11 | CSTL | CASTLE BIOSCIENCES INC | M - Option exercise | 14.6K | - | |
| 2024-11-19 | CSTL | CASTLE BIOSCIENCES INC | S - Open-market sale [10b5-1] | 800 | $30.40 | $24K |
| 2024-11-19 | CSTL | CASTLE BIOSCIENCES INC | S - Open-market sale [10b5-1] | 6.1K | $29.87 | $183K |
Companies - Last 90 Days
- EXAGEN INC. (XGN) - 1 filing, last 2026-06-22
Other Insiders Active in the Same Stocks
Insiders who reported open-market trades at the companies Frank Stokes 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.
- John Aballi - $474K of XGN open-market activity in the last 12 months
- Jeffrey G. Black - $206K of XGN open-market activity in the last 12 months
More Notable Insiders
Other corporate insiders with significant SEC Form 4 track records on InsiderAlpha:
- Spencer Frazier
- Paul J. Fribourg
- Phillip Md Et Al Frost
- Fund 1 Investments, LLC
- Mario J. Gabelli
- Ansbert Gadicke
- Vladimir Galkin
- Rakesh Gangwal
Frequently Asked Questions
Who is Frank Stokes?
Frank Stokes holds the role of Director at EXAGEN INC. (XGN). Stokes's filing history also covers CASTLE BIOSCIENCES INC (CSTL). Stokes has reported 9 insider filings with the SEC since 2024. The most recent filing was in June 2026.…
How many SEC Form 4 filings has Frank Stokes submitted recently?
1 primary Form 4 filing in the last 90 days, covering 1 company.
Has Frank Stokes been buying or selling stock?
Recorded transactions: 0 open-market purchases and 6 open-market sales ($756K) across all tracked filings.
Where can I see all of Frank Stokes'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 Frank Stokes profile on InsiderAlpha for real-time alerts, AI-scored trade ideas, and full transaction history.