IONS

Ionis Pharmaceuticals Inc

$54.73 -0.20 (-0.36%) At close · Jul 15

Market Cap

$9.04B

165,262,556

Total shares sold short and not yet covered, reported to FINRA by broker-dealers and published twice a month (bi-monthly). Days to cover divides the short position by average daily volume; a high value (above 5) can signal short-squeeze potential.

Short Squeeze Score

69/100

Short interest 10.5% of shares — P90 Days to cover 7.3 — P91 Price vs VWAP -23.0% — P13 Short-volume trend +10.0% — P82 Short interest change -1.9% — P39 Worst FTD 0.03% of shares — P56

Peer-relative percentile rank across all stocks reporting short interest at the latest settlement date (2026-06-30). Weighted mean of the available factors (short interest 30%, days to cover 20%, price vs VWAP 15%, short-volume trend 15%, short-interest change 10%, fails-to-deliver 10%) plus catalyst boosts (price spike, volume surge, earnings within days), capped at +20 and clamped to 100.

1M 3M 6M 1Y 5Y All

Short Interest History

Settlement Date	Current Position	Previous Position	Change	Avg Daily Volume	Days to Cover
2026-06-30	17,425,020	17,757,362	-332,342	2,377,735	7.33
2026-06-15	17,757,362	16,986,466	+770,896	1,668,579	10.64
2026-05-29	16,986,466	16,086,234	+900,232	1,702,170	9.98
2026-05-15	16,086,234	16,279,706	-193,472	1,608,774	10.00
2026-04-30	16,279,706	13,762,159	+2,517,547	2,023,751	8.04
2026-04-15	13,762,159	14,330,826	-568,667	1,443,237	9.54
2026-03-31	14,330,826	13,949,702	+381,124	2,418,365	5.93
2026-03-13	13,949,702	15,323,236	-1,373,534	2,453,957	5.68
2026-02-27	15,323,236	15,487,922	-164,686	2,217,431	6.91
2026-02-13	15,487,922	15,537,729	-49,807	1,851,249	8.37
2026-01-30	15,537,729	13,729,783	+1,807,946	2,668,640	5.82
2026-01-15	13,729,783	14,885,370	-1,155,587	2,082,127	6.59
2025-12-31	14,885,370	16,086,183	-1,200,813	1,568,746	9.49
2025-12-15	16,086,183	15,626,208	+459,975	2,020,355	7.96
2025-11-28	15,626,208	14,223,973	+1,402,235	2,624,122	5.95
2025-11-14	14,223,973	12,661,274	+1,562,699	3,736,097	3.81
2025-10-31	12,661,274	13,699,358	-1,038,084	1,914,799	6.61
2025-10-15	13,699,358	12,278,792	+1,420,566	2,279,250	6.01
2025-09-30	12,278,792	11,972,594	+306,198	1,991,945	6.16
2025-09-15	11,972,594	10,502,338	+1,470,256	4,802,271	2.49
2025-08-29	10,502,338	10,785,168	-282,830	1,766,631	5.94
2025-08-15	10,785,168	11,580,340	-795,172	2,150,609	5.01
2025-07-31	11,580,340	12,889,193	-1,308,853	1,778,123	6.51

Showing 1–23 of 23 settlements

Key facts CIK 874015 CUSIP 462222100 13F (30d) 59 filings 39 filers Visit website Investor relations