ACIU short positioning

Twice-monthly snapshots of open short positions.

Settlement 2026-07-31

Short % of Float9.1%39,185,100 float shares

Days to Cover18.2195,352 average daily volume

Open Short Position3,551,322AC Immune SA Common Stock

Change vs Previous+155,373+4.6%

Short interest history

Twice-monthly snapshots of open short positions.

Settlement	Short Position	Change	Change %	Days to Cover	Short % Float
Jul 31, 2026	3,551,322	+155,373	+4.6%	18.2	9.1%
Jul 15, 2026	3,395,949	+19,017	+0.6%	13.3	8.7%
Jun 30, 2026	3,376,932	-139,260	-4.0%	13.0	8.6%

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	97,180	2,236	232,187	41.9%	3
Aug 20, 2026	41,092	0	110,606	37.2%	3
Aug 19, 2026	36,592	0	132,445	27.6%	2
Aug 18, 2026	25,870	0	33,373	77.5%	2
Aug 17, 2026	42,891	0	54,029	79.4%	2
Aug 14, 2026	36,611	0	74,508	49.1%	2
Aug 13, 2026	30,482	1	63,895	47.7%	2
Aug 12, 2026	58,299	1,200	270,391	21.6%	2
Aug 11, 2026	139,102	110	279,855	49.7%	3
Aug 10, 2026	41,838	0	60,143	69.6%	3
Aug 7, 2026	12,441	0	30,080	41.4%	2
Aug 6, 2026	14,160	71	25,604	55.3%	2
Aug 5, 2026	20,807	0	40,139	51.8%	2
Aug 4, 2026	24,091	0	38,576	62.5%	2
Aug 3, 2026	13,047	0	42,298	30.8%	2
Jul 31, 2026	42,312	0	59,547	71.1%	3
Jul 30, 2026	22,698	0	52,910	42.9%	3
Jul 29, 2026	13,728	0	20,900	65.7%	2
Jul 28, 2026	25,824	0	41,570	62.1%	3
Jul 27, 2026	15,765	200	32,422	48.6%	2
Jul 24, 2026	111,897	0	142,602	78.5%	2

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