David Y. Ma - SEC Form 4 Insider Trading Activity
Summary
Updated Aug 3, 2026
David Y. Ma is a corporate insider tracked by InsiderAlpha. No SEC Form 4 filings recorded in the last 90 days. Lifetime open-market sales: $117.18M.
Profile
David Y. Ma is a corporate insider at Sea Ltd (SE). Ma has reported 6 insider filings with the SEC since 2026. The most recent filing was in April 2026.
| Role | Insider |
|---|---|
| Notability | 20/100 |
Board memberships
- Sea Ltd
Trading Pattern
InsiderAlpha's records for David Y. Ma go back to 2026: 6 primary Form 4 filings, an average of 6.0 per year. 40 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 David Y. Ma 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 Sea Ltd (SE) - 6 filings, 2026
Recent Transactions
| Date | Ticker | Company | Code | Shares | Price | Value |
|---|---|---|---|---|---|---|
| 2026-04-22 | SE | Sea Ltd | S - Open-market sale [10b5-1] | 1.4K | $89.74 | $127K |
| 2026-04-22 | SE | Sea Ltd | S - Open-market sale [10b5-1] | 24.6K | $89.13 | $2.19M |
| 2026-04-22 | SE | Sea Ltd | S - Open-market sale [10b5-1] | 49.7K | $88.09 | $4.38M |
| 2026-04-22 | SE | Sea Ltd | S - Open-market sale [10b5-1] | 28.3K | $87.16 | $2.47M |
| 2026-04-22 | SE | Sea Ltd | S - Open-market sale [10b5-1] | 40.2K | $89.93 | $3.61M |
| 2026-04-22 | SE | Sea Ltd | S - Open-market sale [10b5-1] | 128.2K | $89.28 | $11.45M |
| 2026-04-20 | SE | Sea Ltd | S - Open-market sale [10b5-1] | 20.7K | $93.04 | $1.93M |
| 2026-04-20 | SE | Sea Ltd | S - Open-market sale [10b5-1] | 76.3K | $92.34 | $7.04M |
| 2026-04-20 | SE | Sea Ltd | S - Open-market sale [10b5-1] | 40.1K | $91.47 | $3.67M |
| 2026-04-20 | SE | Sea Ltd | S - Open-market sale [10b5-1] | 8.0K | $90.57 | $726K |
| 2026-04-20 | SE | Sea Ltd | S - Open-market sale [10b5-1] | 1.0K | $93.05 | $97K |
| 2026-04-20 | SE | Sea Ltd | S - Open-market sale [10b5-1] | 6.3K | $92.30 | $581K |
| 2026-04-20 | SE | Sea Ltd | S - Open-market sale [10b5-1] | 23.7K | $91.33 | $2.16M |
| 2026-04-20 | SE | Sea Ltd | S - Open-market sale [10b5-1] | 83.1K | $90.40 | $7.51M |
| 2026-04-16 | SE | Sea Ltd | S - Open-market sale [10b5-1] | 2.0K | $90.97 | $185K |
| 2026-04-16 | SE | Sea Ltd | S - Open-market sale [10b5-1] | 53.2K | $90.44 | $4.81M |
| 2026-04-16 | SE | Sea Ltd | S - Open-market sale [10b5-1] | 55.2K | $89.52 | $4.94M |
| 2026-04-16 | SE | Sea Ltd | S - Open-market sale [10b5-1] | 30.7K | $88.10 | $2.71M |
| 2026-04-16 | SE | Sea Ltd | S - Open-market sale [10b5-1] | 19.7K | $87.73 | $1.73M |
| 2026-04-16 | SE | Sea Ltd | S - Open-market sale [10b5-1] | 3.2K | $86.05 | $275K |
Most Active Insiders Right Now
David Y. Ma has no recent co-filers at the same companies, so here are the insiders with the largest open-market activity across the market in the last 90 days.
- MetLife Investment Management, LLC - $1600000.00B of FINS open-market activity in the last 90 days
- Magnetar Financial LLC - $16357.48B of CRWV open-market activity in the last 90 days
- Marianne Okland - $18.46B of STNG open-market activity in the last 90 days
- VisionWave Holdings, Inc. - $14.13B of SVRE open-market activity in the last 90 days
- Vanessa Allen Sutherland - $7.44B of PSX open-market activity in the last 90 days
- AI Alpine (Luxembourg) S.a.r.l. - $2.69B of INIO open-market activity in the last 90 days
More Notable Insiders
Other corporate insiders with significant SEC Form 4 track records on InsiderAlpha:
- Charles A. Davis
- Deep Track Biotechnology Master Fund, Ltd.
- Robert E. Dixon
- Romeo R. Dizon
- Kevin Michael Donahue
- DONEGAL MUTUAL INSURANCE CO
- DORCHESTER MINERALS OPERATING LP
- Robert W. Duggan
Frequently Asked Questions
Who is David Y. Ma?
David Y. Ma is a corporate insider at Sea Ltd (SE). Ma has reported 6 insider filings with the SEC since 2026. The most recent filing was in April 2026.…
Has David Y. Ma been buying or selling stock?
Recorded transactions: 0 open-market purchases and 40 open-market sales ($117.18M) across all tracked filings.
Where can I see all of David Y. Ma'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 David Y. Ma profile on InsiderAlpha for real-time alerts, AI-scored trade ideas, and full transaction history.