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The company

Boundless Bio, Inc.

BOLD · Nasdaq

Health CareBiotechnologyLeading

BOLD stood above a rising 150-day average in 28 of the last 52 weekly readings, including each of the last 27 weeks. It is 10.7% above that average now. Biotechnology: 16% of its 561 stocks in an uptrend (−15 points in four weeks); Health Care: 26% (−10 points in four weeks).

SEC filings

Statistics

Rotation: Leading
Weeks in an uptrend: 27 in a row
Industry in uptrend: 16% -15 in 4 wk
Insider buys, 12 months: $3.4M
Insider sales, 12 months: $268K
Officials’ trades on record: 0
Institutions holding: 38 (+5)

In the rotation

Each square a week: lit when it closed above a rising 150-day average. 28 of 52 weeks.

20 Apr – 19 Oct

Biotechnology: Few of its stocks are in an uptrend and the share has fallen sharply over four weeks. Health Care: A minority of its stocks are in an uptrend and the share has fallen sharply over four weeks.

Money in and out

1 Nov 2024 – 1 Oct 2026

Open-market buys above the line and sales below, in dollars.

Congress and officials

No member of Congress or official has disclosed a trade in it.

Insiders

Buy orders, 12 months21

Sale orders, 12 months6

Buyers · sellers1 · 6

Who	Did	Shares	Traded
Kevin Tang10% owner	bought	220at $2.37	20 Oct 2026filed 20 Oct 2026
Kevin Tang10% owner	bought	12,790at $2.34	19 Oct 2026filed 20 Oct 2026
Kevin Tang10% owner	bought	18,279at $2.33	19 Oct 2026filed 20 Oct 2026
Kevin Tang10% owner	bought	118,185at $2.34	16 Oct 2026filed 20 Oct 2026
Kevin Tang10% owner	sold	18,300at $2.97	26 Aug 2026filed 28 Aug 2026
Kevin Tang10% owner	bought	2,975at $2.44	21 Jul 2026filed 21 Jul 2026
Kevin Tang10% owner	bought	1,623at $2.44	20 Jul 2026filed 21 Jul 2026
Kevin Tang10% owner	bought	265at $2.44	17 Jul 2026filed 21 Jul 2026
Kevin Tang10% owner	bought	18,491at $2.44	16 Jul 2026filed 16 Jul 2026
Kevin Tang10% owner	bought	1,600at $2.44	15 Jul 2026filed 16 Jul 2026
Kevin Tang10% owner	bought	43,878at $2.43	14 Jul 2026filed 16 Jul 2026
Kevin Tang10% owner	bought	48,211at $2.42	13 Jul 2026filed 13 Jul 2026

Lines filed since 2 January 2026, newest first; every insider’s older lines are on their own page.

Institutions

Holders38+5 on the quarter

New · exited14 · 9

Reported value$37.4M

Quarter to 30 Jun 2026, against 31 Mar 2026; newest filing 31 Aug 2026.

Manager	Shares	Change
ARCH Venture Management, LLCnew · filed 14 Aug 2026	2,694,095$6.7M	+2,694,095
FMR LLCreduced · filed 13 Aug 2026	2,581,055$6.5M	-114,400−4.2%
TANG CAPITAL MANAGEMENT LLCnew · filed 14 Aug 2026	2,559,875$6.4M	+2,559,875
ADAR1 Capital Management, LLCnew · filed 14 Aug 2026	1,968,216$4.9M	+1,968,216
Cormorant Asset Management, LPnew · filed 14 Aug 2026	1,000,000$2.5M	+1,000,000
VANGUARD CAPITAL MANAGEMENT LLCadded · filed 13 Aug 2026	614,923$1.5M	+17,731+3.0%
WELLINGTON MANAGEMENT GROUP LLPunchanged · filed 14 Aug 2026	556,233$1.4M	00.0%
MILLENNIUM MANAGEMENT LLCadded · filed 14 Aug 2026	478,639$1.2M	+378,764+379.2%
RENAISSANCE TECHNOLOGIES LLCadded · filed 13 Aug 2026	471,570$1.2M	+72,570+18.2%
Alyeska Investment Group, L.P.unchanged · filed 14 Aug 2026	300,000$750K	00.0%