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IONS · Ionis Pharmaceuticals Inc · Short Volume

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$45.20 +0.82 (+1.85%)
Russell 1000 member Rebalance outlook locked
Market Cap
$7.38B
Shares
166.18M
Volume · Oct 20 2.49M Avg daily vol (3M) 3.28M

Daily short-sale volume published by FINRA from its trade-reporting facilities. It measures how many shares were sold short each day as a share of total volume — a daily flow, not the total outstanding short position.

Pull daily short volume through the short interest API or MCP →
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    • Short Volume

    Date Short Volume Short Exempt Total Volume Short %
    2026-10-20 449,043 2,641 910,642 49.3%
    2026-10-19 416,695 35,800 817,226 51.0%
    2026-10-16 233,848 2,306 566,748 41.3%
    2026-10-15 344,627 40 829,039 41.6%
    2026-10-14 384,551 0 680,213 56.5%
    2026-10-13 283,605 8 767,571 36.9%
    2026-10-12 251,034 51 688,926 36.4%
    2026-10-09 817,352 271 3,425,892 23.9%
    2026-10-08 278,815 0 1,128,198 24.7%
    2026-10-07 335,196 16,200 820,412 40.9%
    2026-10-06 405,782 50,160 944,473 43.0%
    2026-10-05 258,463 58 1,033,641 25.0%
    2026-10-02 286,487 0 862,139 33.2%
    2026-10-01 227,226 330 923,050 24.6%
    2026-09-30 338,367 4,478 915,639 37.0%
    2026-09-29 415,027 42 2,088,310 19.9%
    2026-09-28 455,661 500 1,410,646 32.3%
    2026-09-25 254,487 0 2,885,438 8.8%
    2026-09-24 388,761 5 1,540,498 25.2%
    2026-09-23 434,981 150 1,476,614 29.5%
    2026-09-22 824,598 15,140 2,195,671 37.6%
    2026-09-21 972,600 15 2,060,528 47.2%
    2026-09-18 326,655 300 1,767,607 18.5%
    2026-09-17 422,974 1,217 1,632,707 25.9%
    2026-09-16 594,346 1,474 3,058,519 19.4%
    2026-09-15 862,680 2,384 2,831,996 30.5%
    2026-09-14 719,225 115,928 2,552,780 28.2%
    2026-09-11 355,426 5,954 846,176 42.0%
    2026-09-10 308,457 267 1,007,491 30.6%
    2026-09-09 248,351 2,257 1,229,503 20.2%
    2026-09-08 1,288,807 32,618 4,356,518 29.6%
    2026-09-04 350,510 30,784 913,881 38.4%
    2026-09-03 552,941 17,226 2,028,657 27.3%
    2026-09-02 340,306 124 741,210 45.9%
    2026-09-01 305,822 778 633,248 48.3%
    2026-08-31 379,802 2,602 649,419 58.5%
    2026-08-28 444,360 57,284 715,275 62.1%
    2026-08-27 383,770 976 574,040 66.9%
    2026-08-26 756,131 1,158 1,005,380 75.2%
    2026-08-25 624,356 12,662 1,016,660 61.4%
    2026-08-24 521,314 14,210 863,647 60.4%
    2026-08-21 589,350 430 1,274,304 46.2%
    2026-08-20 352,304 449 861,830 40.9%
    2026-08-19 640,463 5,448 1,307,971 49.0%
    2026-08-18 551,874 3,729 1,023,305 53.9%
    2026-08-17 356,672 3,836 656,135 54.4%
    2026-08-14 197,653 6,000 589,890 33.5%
    2026-08-13 268,039 2,103 444,957 60.2%
    2026-08-12 368,060 1,177 997,824 36.9%
    2026-08-11 374,506 3,147 1,170,616 32.0%
    Showing 1–50 of 66 days
    Key facts CIK 874015 CUSIP 462222100 13F (30d) 41 filings 40 filers Visit website Investor relations