BOLD short positioning

Twice-monthly snapshots of open short positions.

Settlement 2026-07-31

Short % of Float1.3%16,710,500 float shares

Days to Cover1.5147,209 average daily volume

Open Short Position223,819Boundless Bio, Inc. Common Sto

Change vs Previous-16,604-6.9%

Short interest history

Twice-monthly snapshots of open short positions.

Settlement	Short Position	Change	Change %	Days to Cover	Short % Float
Jul 31, 2026	223,819	-16,604	-6.9%	1.5	1.3%
Jul 15, 2026	240,423	+51,475	+27.2%	1.0	1.4%
Jun 30, 2026	188,948	+163,325	+637.4%	1.0	1.1%

Short interest is an open-position snapshot published twice monthly. It is not daily short-sale volume.

Daily off-exchange short volume

FINRA-reported short-sale transaction flow for the last 30 calendar days.

Trade Date	Short Volume	Short Exempt	FINRA Total	Short Volume %	Facilities
Aug 21, 2026	33,399	2,000	49,629	67.3%	3
Aug 20, 2026	61,521	4,430	74,749	82.3%	3
Aug 19, 2026	16,345	0	25,250	64.7%	2
Aug 18, 2026	21,560	0	49,765	43.3%	3
Aug 17, 2026	19,216	0	43,394	44.3%	3
Aug 14, 2026	10,065	0	23,544	42.7%	3
Aug 13, 2026	15,352	0	55,551	27.6%	3
Aug 12, 2026	13,019	0	58,535	22.2%	2
Aug 11, 2026	21,547	0	157,596	13.7%	2
Aug 10, 2026	152,830	1,813	221,432	69.0%	2
Aug 7, 2026	350,024	0	502,509	69.7%	3
Aug 6, 2026	89,315	4,100	139,393	64.1%	3
Aug 5, 2026	89,849	542	232,854	38.6%	3
Aug 4, 2026	41,390	900	122,023	33.9%	3
Aug 3, 2026	57,700	0	113,691	50.8%	3
Jul 31, 2026	14,438	0	31,714	45.5%	3
Jul 30, 2026	2,401	100	17,053	14.1%	2
Jul 29, 2026	22,617	0	29,289	77.2%	2
Jul 28, 2026	15,618	0	33,165	47.1%	3
Jul 27, 2026	23,221	0	70,019	33.2%	2
Jul 24, 2026	21,557	0	69,534	31.0%	3

Daily short volume is transaction flow reported through FINRA facilities. It does not measure open short positions and is not consolidated exchange-wide volume.