Summary
Updated Aug 31, 2026
Kevin Tang is 10% Owner of Boundless Bio, Inc. (BOLD). 13 SEC Form 4 filings on record going back to 2024, most recently on 28 August 2026. Most recent open-market trade: sold $54K of BOLD on 28 August 2026. Lifetime open-market purchases: $52.56M. Lifetime open-market sales: $54K. Historical track record: 3/5 stars across 12 tracked purchases.
Recent Transactions
20Every recent SEC Form 4 transaction Kevin Tang has reported, most recent first.
Track Record
InsiderAlpha computes a forward-return-based score for every insider with enough Form 4 purchase history. The metrics below reflect realized performance after each tracked open-market purchase.
| Metric | Value |
|---|---|
| InsiderAlpha rating | ★★★☆☆ (3/5) |
| Total purchases tracked | 12 |
| Purchases with forward-return data | 12 |
| 30-day win rate | 50% |
| 90-day win rate | 75% |
| Avg 5-day return | +5.56% |
| Avg 30-day return | +2.24% |
| Avg 90-day return | +5.89% |
| Best 30-day return | +11.34% |
Trading Pattern
InsiderAlpha's records for Kevin Tang go back to 2024: 13 primary Form 4 filings, an average of 4.3 per year. The typical open-market purchase is $1.17M (45 buys totaling $52.56M). The largest single buy on record is $10.12M of AUPH in 2025. Sales side: 1 recorded sale totaling $54K, so the filing history runs buy-heavy by dollar value. 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.
Other Insiders Active in the Same Stocks
Insiders who reported open-market trades in the last 12 months at the companies Kevin Tang files at. Multiple unrelated insiders buying the same stock within a short window, cluster buying, has historically been one of the strongest Form 4 signals.
- Robert J. Gould - $507K of FULC open-market activity in the last 12 months
- Stephen P. Robertson - $356K of AUPH open-market activity in the last 12 months
- Alan Ezekowitz - $66K of FULC open-market activity in the last 12 months
- Curtis Gale Oltmans - $45K of FULC open-market activity in the last 12 months
- Keith Crandell - $40K of BOLD open-market activity in the last 12 months
- ARCH Venture Fund IX, L.P. - $40K of BOLD open-market activity in the last 12 months
More Notable Insiders
Other corporate insiders with significant SEC Form 4 track records on InsiderAlpha:
Frequently Asked Questions
Who is Kevin Tang?
Kevin Tang is a corporate insider, tracked as 10% Owner of Boundless Bio, Inc. (BOLD). InsiderAlpha holds 13 primary Form 4 filings for them, the earliest from 2024, updated as new SEC EDGAR filings are processed.
How many SEC Form 4 filings has Kevin Tang submitted recently?
10 primary Form 4 filings in the last 90 days, covering 3 companies.
Has Kevin Tang been buying or selling stock?
Recorded transactions: 45 open-market purchases ($52.56M) and 1 open-market sale ($54K) across all tracked filings.
How accurate is Kevin Tang's historical track record?
Across 12 tracked purchases, Kevin Tang averaged +2.2% avg 30-day return with a 50% 30-day win rate. InsiderAlpha rates the track record at 3/5 stars.
Where can I see all of Kevin Tang'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.
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