Wednesday, October 28, 2026
Data from SEC filings, checked daily
Public filings, plainly told
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StockCIK 1782303

Boundless Bio, Inc. (BOLD): Insider Trades and Fund Holdings

In the past 12 months, Boundless Bio, Inc. insiders reported 6 open-market purchases worth $401K and 1 sale worth $54K; 0 of the sales were reported as made under a 10b5-1 trading plan.

6Insider buys, 12 months
$401KBought by insiders, 12 months
$54KSold by insiders, 12 months
1Tracked funds holding

Timeline: news and trades

Company filings (8-K), insider trades, notices of planned sales (Form 144) and fund moves in the past year, newest first.

  1. Oct 26, 2026Insider buy10% owner Kevin Tang bought $22,862
  2. Oct 23, 2026Insider buy10% owner Kevin Tang bought $14,837
  3. Oct 22, 2026Insider buy10% owner Kevin Tang bought $13,920
  4. Oct 20, 2026Insider buy10% owner Kevin Tang bought $521
  5. Oct 19, 2026Insider buy10% owner Kevin Tang bought $72,519
  6. Oct 16, 2026Insider buy10% owner Kevin Tang bought $276,553
  7. Aug 26, 2026Insider sale10% owner Kevin Tang sold $54,351
  8. Jun 30, 2026FundRenaissance Technologies added 18% in Q2 2026 (13F filed Aug 13, 2026)

Recent insider trades

Open-market purchases (code P) and sales (code S) from Form 4. Grants, option exercises and gifts are not shown. Latest filing: Oct 26, 2026.

Recent BOLD insider trades
FiledTradedInsiderRoleTypeSharesPrice ($)ValueHoldingFiling
Oct 26Oct 26Kevin Tang10% owner10% owner (ind.)▲ BUY9,6062.38$23K+0.3%Form 4 ↗
Oct 26Oct 23Kevin Tang10% owner10% owner (ind.)▲ BUY6,2342.38$15K+0.2%Form 4 ↗
Oct 26Oct 22Kevin Tang10% owner10% owner (ind.)▲ BUY5,8002.40$14K+0.2%Form 4 ↗
Oct 20Oct 16Kevin Tang10% owner10% owner (ind.)▲ BUY118,1852.34$277K+4.2%Form 4 ↗
Oct 20Oct 19Kevin Tang10% owner10% owner (ind.)▲ BUY31,0692.33$73K+1.1%Form 4 ↗
Oct 20Oct 20Kevin Tang10% owner10% owner (ind.)▲ BUY2202.37$521+0.0%Form 4 ↗
Aug 28Aug 26Kevin Tang10% owner10% owner (ind.)▼ SELL18,3002.97$54K−0.6%Form 4 ↗
Source: SEC Form 4 filings, retrieved Oct 28, 2026. How we read filings

Insiders who traded in the past year

InsiderRoleBuysBoughtSellsSoldLatest
Kevin Tang10% owner6$401K1$54KOct 26, 2026

Tracked funds that report BOLD

From each fund's latest 13F. Holdings are as of quarter end and are filed up to 45 days later.

FundQuarterSharesValue% of portfolioChange
Renaissance TechnologiesQ2 2026471,570$1.18M0.00%▲ +18.2%
Source: SEC Form 13F-HR filings, retrieved Oct 28, 2026. How we read filings

Reading these numbers

Insiders sell for many reasons: taxes, diversification, a house. Purchases with their own money are rarer and are usually read as more informative. A Form 4 is due within two business days of the trade. How to read a Form 4 →