Boundless Bio BOLD Insider Ownership

NASDAQ BOLD
$2.85 -0.01 (-0.35%)
At close: Sep 9, 2026 · 4:00 PM EDT

Insider Holdings by Owner

9.08Mn Shares

Insider Ownership Statistics

as of 30 Sep, 2026
Insider Ownership
5.28%
■0% pp QoQ
Shares Held by Insiders
1.18Mn
filed for Sep 2026
■0.00% QoQ
Shares Outstanding
22.39Mn
22,386,000 shares
Direct Holdings
0
Indirect: 1.18Mn
Net Shares Traded (QoQ)
0
no net change in Sep 2026
Insiders Holding Shares
4
with Form 4 holdings on file

Shares Owned by Insiders

Shares held % of outstanding
Latest —
Average ownership —
Peak ownership —

Shares Purchased/Sold by Insiders

Bought Sold
Latest quarter —
Net over range —
Buying quarters —

Insider Ownership Summary

Quarter ending 30 Sep, 2026

As of September 09, 2026, Boundless Bio's top three insider holders are Kevin Tang (TenPercentOwner, 5.54Mn shares), Kristina Burow (Director, 1.18Mn shares), Venture Fund Ix, L.P. Arch (TenPercentOwner, 1.18Mn shares).

Form 4 Holdings

Insiders Holding BOLD

Insiders 4
Shares held 9.08Mn
Of outstanding 40.58%
# Insider Position Direct Indirect Total Share of Insiders Last Filed
1 Kevin Tang TenPercentOwner 0 5,539,153 5,539,153 61.0% 28 Aug, 2026
2 Keith Crandell TenPercentOwner 0 1,181,766 1,181,766 13.0% 04 Apr, 2024
3 Kristina Burow Director, TenPercentOwner 0 1,181,766 1,181,766 13.0% 04 Apr, 2024
4 Venture Fund Ix, L.P. Arch TenPercentOwner 0 1,181,766 1,181,766 13.0% 04 Apr, 2024

Each row is that insider’s most recently reported position, from Form 4 filings over the last 60 months — which is why this total does not tie to the quarterly series above, where a quarter counts only the insiders who filed in it. Shares held through a fund or institutional portfolio are counted on the institutional ownership page instead.

Form 4 Filings

350 Insider Transactions

Source SEC Form 4
Latest quarter Sep 2026
Download Data
Date Insider Position Transaction Shares Price Value Shares Held After Ownership
26 Aug, 2026 Kevin Tang TenPercentOwner Disposed S 18,300 $2.97 $54.35K 2,840,635 Indirect
17 Jul, 2026 Kevin Tang TenPercentOwner Acquired P 265 $2.44 $647 2,854,337 Indirect
20 Jul, 2026 Kevin Tang TenPercentOwner Acquired P 1,623 $2.44 $3.96K 2,855,960 Indirect
21 Jul, 2026 Kevin Tang TenPercentOwner Acquired P 2,975 $2.44 $7.26K 2,858,935 Indirect
14 Jul, 2026 Kevin Tang TenPercentOwner Acquired P 43,878 $2.43 $106.62K 2,833,981 Indirect
15 Jul, 2026 Kevin Tang TenPercentOwner Acquired P 1,600 $2.44 $3.90K 2,835,581 Indirect
16 Jul, 2026 Kevin Tang TenPercentOwner Acquired P 18,491 $2.44 $45.12K 2,854,072 Indirect
09 Jul, 2026 Kevin Tang TenPercentOwner Acquired P 7 $2.48 $17 2,698,525 Indirect
10 Jul, 2026 Kevin Tang TenPercentOwner Acquired P 43,367 $2.43 $105.38K 2,741,892 Indirect
13 Jul, 2026 Kevin Tang TenPercentOwner Acquired P 48,211 $2.42 $116.67K 2,790,103 Indirect
06 Jul, 2026 Kevin Tang TenPercentOwner Acquired P 27,062 $2.49 $67.38K 2,668,370 Indirect
07 Jul, 2026 Kevin Tang TenPercentOwner Acquired P 15,810 $2.48 $39.21K 2,684,180 Indirect
08 Jul, 2026 Kevin Tang TenPercentOwner Acquired P 14,338 $2.46 $35.27K 2,698,518 Indirect
01 Jul, 2026 Venture Fund Ix, L.P. Arch TenPercentOwner Acquired M 16,000 $1.03 $16.48K 16,000 Indirect
01 Jul, 2026 Venture Fund Ix, L.P. Arch TenPercentOwner Disposed S 16,000 $2.49 $39.84K 0 Indirect
01 Jul, 2026 Venture Fund Ix, L.P. Arch TenPercentOwner Disposed M 16,000 $0.00 $0 0 Indirect
30 Jun, 2026 Kevin Tang TenPercentOwner Acquired P 25,930 $2.54 $65.86K 2,559,775 Indirect
30 Jun, 2026 Kevin Tang TenPercentOwner Acquired P 100 $2.50 $250 2,559,875 Indirect
01 Jul, 2026 Kevin Tang TenPercentOwner Acquired P 71,612 $2.49 $178.31K 2,631,487 Indirect
02 Jul, 2026 Kevin Tang TenPercentOwner Acquired P 9,821 $2.49 $24.45K 2,641,308 Indirect