BOLDNasdaq

Boundless Bio, Inc.

Alert me on BOLD

Insider buys, 6 months

Congress trades, 6 months

Signals, 6 months

Six months

After each filing

Nov 6 Buy TANG KEVIN Insider

1 week

Result in4 trading days

1 month

Result in20 trading days

3 months

Result in62 trading days

6 months

Result in125 trading days

Nov 6 Buy TANG CAPITAL MANAGEMENT LLC Insider

1 week

Result in4 trading days

1 month

Result in20 trading days

3 months

Result in62 trading days

6 months

Result in125 trading days

Oct 30 Buy TANG KEVIN Insider

1 week

−0.4%S&P −2.7%

1 month

Result in15 trading days

3 months

Result in57 trading days

6 months

Result in120 trading days

Oct 30 Buy TANG CAPITAL MANAGEMENT LLC Insider

1 week

−0.4%S&P −2.7%

1 month

Result in15 trading days

3 months

Result in57 trading days

6 months

Result in120 trading days

Oct 27 Buy TANG KEVIN Insider

1 week

−1.2%S&P −2.0%

1 month

Result in12 trading days

3 months

Result in54 trading days

6 months

Result in117 trading days

Show all 35

Oct 27 Buy TANG CAPITAL MANAGEMENT LLC Insider

1 week

−1.2%S&P −2.0%

1 month

Result in12 trading days

3 months

Result in54 trading days

6 months

Result in117 trading days

Oct 21 Buy TANG KEVIN Insider

1 week

+2.5%S&P −0.1%

1 month

Result in8 trading days

3 months

Result in50 trading days

6 months

Result in113 trading days

Oct 21 Buy TANG CAPITAL MANAGEMENT LLC Insider

1 week

+2.5%S&P −0.1%

1 month

Result in8 trading days

3 months

Result in50 trading days

6 months

Result in113 trading days

Aug 29 Sale TANG KEVIN Insider

1 week

+1.8%S&P −0.1%

1 month

−10.7%S&P −0.3%

3 months

Result in14 trading days

6 months

Result in77 trading days

Aug 29 Sale TANG CAPITAL MANAGEMENT LLC Insider

1 week

+1.8%S&P −0.1%

1 month

−10.7%S&P −0.3%

3 months

Result in14 trading days

6 months

Result in77 trading days

Jul 22 Buy TANG KEVIN Insider

1 week

−1.6%S&P −2.4%

1 month

+15.1%S&P +2.0%

3 months

−3.6%S&P +3.2%

6 months

Result in49 trading days

Jul 22 Buy TANG CAPITAL MANAGEMENT LLC Insider

1 week

−1.6%S&P −2.4%

1 month

+15.1%S&P +2.0%

3 months

−3.6%S&P +3.2%

6 months

Result in49 trading days

Jul 17 Buy TANG KEVIN Insider

1 week

+3.6%S&P −0.6%

1 month

+14.1%S&P +4.0%

3 months

−5.2%S&P +4.1%

6 months

Result in46 trading days

Jul 17 Buy TANG CAPITAL MANAGEMENT LLC Insider

1 week

+3.6%S&P −0.6%

1 month

+14.1%S&P +4.0%

3 months

−5.2%S&P +4.1%

6 months

Result in46 trading days

Jul 14 Buy TANG KEVIN Insider

1 week

+0.8%S&P −0.5%

1 month

+13.0%S&P +2.7%

3 months

+3.7%S&P +3.8%

6 months

Result in43 trading days

Jul 14 Buy TANG CAPITAL MANAGEMENT LLC Insider

1 week

+0.8%S&P −0.5%

1 month

+13.0%S&P +2.7%

3 months

+3.7%S&P +3.8%

6 months

Result in43 trading days

Jul 9 Buy TANG KEVIN Insider

1 week

−0.8%S&P −0.1%

1 month

+15.1%S&P +2.9%

3 months

+5.2%S&P +3.6%

6 months

Result in40 trading days

Jul 9 Buy TANG CAPITAL MANAGEMENT LLC Insider

1 week

−0.8%S&P −0.1%

1 month

+15.1%S&P +2.9%

3 months

+5.2%S&P +3.6%

6 months

Result in40 trading days

Jul 7 Sale ARCH Venture Fund IX, L.P. Insider

1 week

−1.6%S&P +0.6%

1 month

+12.0%S&P +3.0%

3 months

+4.0%S&P +3.9%

6 months

Result in38 trading days

Jul 7 Sale ARCH Venture Fund IX Overage, L.P. Insider

1 week

−1.6%S&P +0.6%

1 month

+12.0%S&P +3.0%

3 months

+4.0%S&P +3.9%

6 months

Result in38 trading days

Jul 7 Sale ARCH Venture Fund X Overage, L.P. Insider

1 week

−1.6%S&P +0.6%

1 month

+12.0%S&P +3.0%

3 months

+4.0%S&P +3.9%

6 months

Result in38 trading days

Jul 7 Sale ARCH Venture Partners IX, L.P. Insider

1 week

−1.6%S&P +0.6%

1 month

+12.0%S&P +3.0%

3 months

+4.0%S&P +3.9%

6 months

Result in38 trading days

Jul 7 Sale ARCH Venture Partners IX Overage, L.P. Insider

1 week

−1.6%S&P +0.6%

1 month

+12.0%S&P +3.0%

3 months

+4.0%S&P +3.9%

6 months

Result in38 trading days

Jul 7 Sale ARCH Venture Partners X Overage, L.P. Insider

1 week

−1.6%S&P +0.6%

1 month

+12.0%S&P +3.0%

3 months

+4.0%S&P +3.9%

6 months

Result in38 trading days

Jul 7 Sale ARCH Venture Partners IX, LLC Insider

1 week

−1.6%S&P +0.6%

1 month

+12.0%S&P +3.0%

3 months

+4.0%S&P +3.9%

6 months

Result in38 trading days

Jul 7 Sale ARCH Venture Partners X, LLC Insider

1 week

−1.6%S&P +0.6%

1 month

+12.0%S&P +3.0%

3 months

+4.0%S&P +3.9%

6 months

Result in38 trading days

Jul 7 Sale CRANDELL KEITH Insider

1 week

−1.6%S&P +0.6%

1 month

+12.0%S&P +3.0%

3 months

+4.0%S&P +3.9%

6 months

Result in38 trading days

Jul 7 Sale BYBEE CLINTON Insider

1 week

−1.6%S&P +0.6%

1 month

+12.0%S&P +3.0%

3 months

+4.0%S&P +3.9%

6 months

Result in38 trading days

Jul 7 Sale NELSEN ROBERT Insider

1 week

−1.6%S&P +0.6%

1 month

+12.0%S&P +3.0%

3 months

+4.0%S&P +3.9%

6 months

Result in38 trading days

Jul 7 Sale GILLIS STEVEN Insider

1 week

−1.6%S&P +0.6%

1 month

+12.0%S&P +3.0%

3 months

+4.0%S&P +3.9%

6 months

Result in38 trading days

Jul 7 Sale Burow Kristina Insider

1 week

−1.6%S&P +0.6%

1 month

+12.0%S&P +3.0%

3 months

+4.0%S&P +3.9%

6 months

Result in38 trading days

Jul 3 Buy TANG KEVIN Insider

1 week

−2.4%S&P −0.3%

1 month

+8.2%S&P +2.7%

3 months

+4.8%S&P +2.7%

6 months

Result in37 trading days

Jul 3 Buy TANG CAPITAL MANAGEMENT LLC Insider

1 week

−2.4%S&P −0.3%

1 month

+8.2%S&P +2.7%

3 months

+4.8%S&P +2.7%

6 months

Result in37 trading days

Jun 30 Buy TANG KEVIN Insider

1 week

−2.0%S&P −0.2%

1 month

0.0%S&P −0.7%

3 months

+2.4%S&P +2.6%

6 months

Result in34 trading days

Jun 30 Buy TANG CAPITAL MANAGEMENT LLC Insider

1 week

−2.0%S&P −0.2%

1 month

0.0%S&P −0.7%

3 months

+2.4%S&P +2.6%

6 months

Result in34 trading days

Every purchase and sale on this ticker reported by a member of Congress or an insider, measured from the close of the first trading day after it became public to the close 1 week, 1 month, 3 months and 6 months later, each beside the S&P over the same days.

Filings for BOLD

29 held · newest 529 held · newest 2

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See all 29 filings for BOLD

Aeon news and offers by email

New sources, new features and offers like our founding price. A few times a month at most. Stop any time.

Signal history

Oct 20 Insider

TANG KEVIN (10% owner) bought $350K

A week later+2.5%S&P −0.1%

Result in 8 trading days

Result in 50 trading days

Result in 113 trading days

Stakes

Oct 14, 2025 Schedule 13G

Zachary Hornby: 9.8%, 2,426,857 shares

Jun 30, 2026 Schedule 13G

ADAR1 Capital Management, LLC: 8.8%, 1,968,216 shares

Jun 30, 2026 Schedule 13G, amended

Citadel Securities Group LP: 0.6%, 145,118 shares

Jun 23, 2026 Schedule 13G

TANG CAPITAL MANAGEMENT, LLC: 11.3%, 2,533,845 shares

Dec 31, 2025 Schedule 13G, amended

Nextech VI GP S.a. r.l.: 0%, 0 shares

Dec 31, 2025 Schedule 13G, amended

FMR LLC: 12%, 2,684,022 shares

Nov 26, 2025 Schedule 13G

Kenneth Griffin: 6.4%, 1,433,388 shares

Schedule 13D is filed within 5 business days of crossing 5 percent by an investor who may seek to influence the company. Schedule 13G is filed by a passive holder, and a large institution has up to 45 days after the quarter end.

Government contracts, last 12 months

Awards of $10M and up, from USAspending · context, not a signal

No contracts of $10M or more in the last 12 months.

Lobbying

Last four quarters

No lobbying reports on file.