BOLD insider buying and SEC filings, explained
Boundless Bio, Inc. · CIK 1782303
Tracked: Forms 3/4/5, 8-K, NT · All filings on sec.gov
Insider activity in the last 12 months
Bought
$1.9M
Insiders who bought
1
Sold (not marked 10b5-1)
$54K
Planned sales (10b5-1)
$0
Insider purchases and sales, last 12 months
| Traded | Type | What was filed | Source |
|---|---|---|---|
| Oct 27, 2026 | Purchase (code P) | Kevin Tang (10% owner) bought 10,707 shares indirectly at about $2.40 ($26K), reported as a purchase (code P). Indirect holdings up <1% to 3,022,456 shares. Not marked as a 10b5-1 plan trade. Filed jointly with 1 other reporting owner. | SEC filing Filed Oct 29, 2026, 6:20 PM ET |
| Oct 22–26, 2026 | Purchase (code P) | Kevin Tang (10% owner) bought 21,640 shares indirectly between Oct 22 and Oct 26 at about $2.39 ($52K), reported as a purchase (code P). Indirect holdings up 1% to 3,011,749 shares. Not marked as a 10b5-1 plan trade. Filed jointly with 1 other reporting owner. | SEC filing Filed Oct 26, 2026, 4:51 PM ET |
| Oct 16–20, 2026 | Purchase (code P) | Kevin Tang (10% owner) bought 149,474 shares indirectly between Oct 16 and Oct 20 at about $2.34 ($350K), reported as a purchase (code P). Indirect holdings up 5% to 2,990,109 shares. Not marked as a 10b5-1 plan trade. Filed jointly with 1 other reporting owner. | SEC filing Filed Oct 20, 2026, 5:49 PM ET |
| Aug 26, 2026 | Sale | Kevin Tang (10% owner) sold 18,300 shares indirectly at about $2.97 ($54K). Indirect holdings down 1% to 2,840,635 shares. Not marked as a 10b5-1 plan trade. Filed jointly with 1 other reporting owner. | SEC filing Filed Aug 28, 2026 |
| Jul 17–21, 2026 | Purchase (code P) | Kevin Tang (10% owner) bought 4,863 shares indirectly between Jul 17 and Jul 21 at about $2.44 ($12K), reported as a purchase (code P). Indirect holdings up <1% to 2,858,935 shares. Not marked as a 10b5-1 plan trade. Filed jointly with 1 other reporting owner. | SEC filing Filed Jul 21, 2026 |
| Jul 14–16, 2026 | Purchase (code P) | Kevin Tang (10% owner) bought 63,969 shares indirectly between Jul 14 and Jul 16 at about $2.43 ($156K), reported as a purchase (code P). Indirect holdings up 2% to 2,854,072 shares. Not marked as a 10b5-1 plan trade. Filed jointly with 1 other reporting owner. | SEC filing Filed Jul 16, 2026 |
| Jul 9–13, 2026 | Purchase (code P) | Kevin Tang (10% owner) bought 91,585 shares indirectly between Jul 9 and Jul 13 at about $2.42 ($222K), reported as a purchase (code P). Indirect holdings up 3% to 2,790,103 shares. Not marked as a 10b5-1 plan trade. Filed jointly with 1 other reporting owner. | SEC filing Filed Jul 13, 2026 |
| Jul 6–8, 2026 | Purchase (code P) | Kevin Tang (10% owner) bought 57,210 shares indirectly (by entity) between Jul 6 and Jul 8 at about $2.48 ($142K), reported as a purchase (code P). Holdings by entity up 2% to 2,698,518 shares. Not marked as a 10b5-1 plan trade. Filed jointly with 1 other reporting owner. | SEC filing Filed Jul 8, 2026 |
| Jun 30–Jul 2, 2026 | Purchase (code P) | Kevin Tang (10% owner) bought 107,463 shares indirectly (by entity) between Jun 30 and Jul 2 at about $2.50 ($269K), reported as a purchase (code P). Holdings by entity up 4% to 2,641,308 shares. Not marked as a 10b5-1 plan trade. Filed jointly with 1 other reporting owner. | SEC filing Filed Jul 2, 2026 |
| Jun 25–29, 2026 | Purchase (code P) | Kevin Tang (10% owner) bought 286,333 shares indirectly (by entity) between Jun 25 and Jun 29 at about $2.50 ($715K), reported as a purchase (code P). Holdings by entity up 13% to 2,533,845 shares. Not marked as a 10b5-1 plan trade. Filed jointly with 1 other reporting owner. | SEC filing Filed Jun 29, 2026 |
13 routine transactions (such as grants, option exercises or tax withholding) are not listed.
Cluster buys
No cluster buys in the last 12 months.
Red flags
No red flags in the last 12 months.
Key events
No key events in the last 12 months.
8-K filings, last 12 months
No 8-K filings in the last 12 months.
Red flags are objective triggers only: the item or form filed, never an opinion.
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