Skip to main content
Equibles
IONS logo

IONS · Ionis Pharmaceuticals Inc

Track IONS — free

Use IONS with AI

Ask our own analyst here, or connect this data to the AI you already use.

Free, nothing to set up — ALVIS runs on the same tools and cites every figure.

or use your own AI

The free Equibles MCP server lets any client query SEC filings, earnings calls, KPIs, holdings and prices directly — read-only, OAuth-secured, cited to the filing.

ChatGPT Claude Gemini
Server URL
https://mcp.equibles.com/mcp
All connection guides →
$52.29 -5.84 (-10.05%) At close · Sep 4
Russell 1000 member Rebalance outlook locked
Market Cap
$9.65B
Shares
166.18M

Shares sold short and not yet covered, reported twice monthly. Days to cover is the reported short position divided by average daily volume.

IONS Latest Reported Short Interest

FINRA reported 20,909,181 IONS shares sold short as of the August 14, 2026 settlement date, a decrease of 556,942 shares. Days to cover was 9.62 based on FINRA's reported average daily volume.

Official FINRA short-interest data · share counts are restated for subsequent splits of this listing

IONS Short Interest Forecast

Equibles' model estimates 21,223,616 shares sold short for the August 31, 2026 settlement, +1.5% versus the latest reported position, with a likely range of 19,371,551 to 23,109,298 shares. This model prediction uses FINRA data through August 31, 2026; FINRA's official release is expected September 10, 2026.

Model estimate

Expected Aug 31 short interest

as of Aug 31 Low confidence 56% chance it falls
21,223,616 +1.5% vs reported
Likely range 19,371,551 to 23,109,298 The latest estimate appears in the chart below. Official release expected Sep 10. Methodology
Short Squeeze Score
66/100
Short interest 12.6% of shares — P93 Days to cover 9.6 — P89 Price vs VWAP -7.7% — P28 Short-volume trend +1.9% — P58 Short interest change -2.6% — P42 Worst FTD 0.00% of shares — P33

Peer-relative percentile rank across all listed securities reporting short interest at the latest settlement date (2026-08-14). 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
Dimensions
  • Add to chart

    • Short Interest History

    Settlement Date Current Position Previous Position Change Days to Cover
    2026-09-15 Scheduled
    FINRA publishes Sep 24
    		 — — — —
    2026-08-31 Scheduled
    FINRA publishes Sep 10
    		 — — — —
    2026-08-14 20,909,181 21,466,123 -556,942 9.62
    2026-07-31 21,466,123 20,042,879 +1,423,244 6.35
    2026-07-15 20,042,879 17,425,020 +2,617,859 3.68
    2026-06-30 17,425,020 17,757,362 -332,342 7.33
    2026-06-15 17,757,362 16,986,466 +770,896 10.64
    2026-05-29 16,986,466 16,086,234 +900,232 9.98
    2026-05-15 16,086,234 16,279,706 -193,472 10.00
    2026-04-30 16,279,706 13,762,159 +2,517,547 8.04
    2026-04-15 13,762,159 14,330,826 -568,667 9.54
    2026-03-31 14,330,826 13,949,702 +381,124 5.93
    2026-03-13 13,949,702 15,323,236 -1,373,534 5.68
    2026-02-27 15,323,236 15,487,922 -164,686 6.91
    2026-02-13 15,487,922 15,537,729 -49,807 8.37
    2026-01-30 15,537,729 13,729,783 +1,807,946 5.82
    2026-01-15 13,729,783 14,885,370 -1,155,587 6.59
    2025-12-31 14,885,370 16,086,183 -1,200,813 9.49
    2025-12-15 16,086,183 15,626,208 +459,975 7.96
    2025-11-28 15,626,208 14,223,973 +1,402,235 5.95
    2025-11-14 14,223,973 12,661,274 +1,562,699 3.81
    2025-10-31 12,661,274 13,699,358 -1,038,084 6.61
    2025-10-15 13,699,358 12,278,792 +1,420,566 6.01
    2025-09-30 12,278,792 11,972,594 +306,198 6.16
    2025-09-15 11,972,594 10,502,338 +1,470,256 2.49

    Full FINRA short interest reporting calendar

    Showing 1–23 of 23 settlements
    Key facts CIK 874015 CUSIP 462222100 13F (30d) 368 filings 354 filers Visit website Investor relations