ALT short positioning

Twice-monthly snapshots of open short positions.

Settlement 2026-07-31

Short % of Float31.6%164,239,000 float shares

Days to Cover11.54,534,307 average daily volume

Open Short Position51,938,259Altimmune, Inc. Common Stock

Change vs Previous+3,695,917+7.7%

Short interest history

Twice-monthly snapshots of open short positions.

Settlement	Short Position	Change	Change %	Days to Cover	Short % Float
Jul 31, 2026	51,938,259	+3,695,917	+7.7%	11.5	31.6%
Jul 15, 2026	48,242,342	+608,201	+1.3%	12.5	29.4%
Jun 30, 2026	47,634,141	+5,706,713	+13.6%	8.1	29.0%

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	734,031	6,137	3,225,567	22.8%	3
Aug 20, 2026	1,304,262	8,135	2,400,323	54.3%	3
Aug 19, 2026	1,086,354	24,669	4,880,167	22.3%	3
Aug 18, 2026	457,152	4	1,202,167	38.0%	2
Aug 17, 2026	769,671	0	2,282,715	33.7%	3
Aug 14, 2026	759,790	846	1,366,137	55.6%	3
Aug 13, 2026	1,339,598	737	2,241,016	59.8%	3
Aug 12, 2026	1,209,476	23,068	2,941,640	41.1%	3
Aug 11, 2026	789,616	1,103	1,718,114	46.0%	3
Aug 10, 2026	600,815	0	2,547,859	23.6%	3
Aug 7, 2026	819,905	0	2,237,886	36.6%	3
Aug 6, 2026	713,609	0	1,406,716	50.7%	3
Aug 5, 2026	517,544	0	1,343,123	38.5%	3
Aug 4, 2026	1,211,605	0	3,551,327	34.1%	3
Aug 3, 2026	1,268,927	10	2,344,811	54.1%	3
Jul 31, 2026	1,197,374	1,451	1,699,991	70.4%	3
Jul 30, 2026	1,212,061	15,005	2,156,961	56.2%	3
Jul 29, 2026	1,713,674	47	4,074,177	42.1%	3
Jul 28, 2026	4,266,032	8,841	6,133,784	69.5%	3
Jul 27, 2026	823,807	3,952	1,827,461	45.1%	3
Jul 24, 2026	431,807	9,138	723,022	59.7%	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.