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Stock research / United States / INSM / Short interest

Insmed Inc. short interest

13.5M shares of Insmed were sold short at the 15 October 2026 settlement, near the middle of its range over the last year (8.0M to 19.1M). Short sellers would need 4.1 days of normal trading to buy them back.

Shares sold short13.5Mat 15 Oct 2026
Change on the settlement before-2.3%+42% over a year
Days to cover4.13at 3.3M shares a day
Of shares in issue6.17%shares short over shares outstanding
New to this? How to read this page
  1. Short interest is the number of shares investors have borrowed and sold, betting the price will fall, and not yet bought back.
  2. Days to cover is shares short over an average day's trading: how many days it would take short sellers to buy them all back. Above 5 or so is high.
  3. Rising short interest says more investors are betting against the stock. A crowded short can also rise fast if shorts rush to buy back.
  4. Brokers report it twice a month to FINRA, about ten days after each settlement date.
  5. What is short interest?

Short interest, days to cover and the price

Short interest is near the middle of its range over the last year (8.0M to 19.1M), and the share price moved -42% over the last year.

Shares sold shortDays to coverShare price

Three charts on one timeline. Top: shares sold short at each settlement. Middle: days to cover, taller meaning shorts would need longer to buy back. Bottom: the share price, so you can see whether shorts added as the price fell or rose.

How it compares

every company on the site

    The bar ranks every company on the site from the lowest on the left to the highest on the right, in three equal thirds; the small figures under it are the values where each third starts, and the black tick is the middle company. The orange dot is this company; the grey ticks are the other companies in its industry (hover or tap for names). A hatched block is companies tied at none.

    Every settlement since 29 Dec 2017 as a table
    SettlementShares shortChangeAverage daily volumeDays to cover
    15 October 202613.5M-2.3%3.3M4.13
    30 September 202613.8M+27.8%2.1M6.50
    15 September 202610.8M-5.6%2.0M5.27
    31 August 202611.4M+5.0%1.7M6.86
    14 August 202610.9M-4.0%4.1M2.66
    31 July 202611.4M-2.4%2.2M5.14
    15 July 202611.6M-27.5%2.4M4.76
    30 June 202616.0M-14.0%5.8M2.76
    15 June 202618.6M-2.5%4.2M4.48
    29 May 202619.1M+8.7%3.1M6.11
    15 May 202617.6M+19.7%5.2M3.38
    30 April 202614.7M+6.2%1.6M9.30
    15 April 202613.9M+0.7%2.0M6.97
    31 March 202613.8M+37.0%3.0M4.66
    13 March 202610.0M-11.0%1.9M5.28
    27 February 202611.3M-1.8%2.6M4.40
    13 February 202611.5M-1.8%2.2M5.28
    30 January 202611.7M-1.6%2.5M4.76
    15 January 202611.9M+7.9%2.8M4.22
    31 December 202511.0M+23.4%4.7M2.33
    15 December 20258.9M-9.5%2.4M3.75
    28 November 20259.9M+10.5%3.5M2.82
    14 November 20258.9M+11.1%2.1M4.30
    31 October 20258.0M-15.3%2.3M3.52
    15 October 20259.5M-11.6%1.9M4.95
    30 September 202510.7M+1.4%2.3M4.69
    15 September 202510.6M+0.1%2.2M4.86
    29 August 202510.6M+0.6%2.2M4.75
    15 August 202510.5M+10.1%3.7M2.84
    31 July 20259.5M-1.6%2.2M4.32
    15 July 20259.7M-1.1%2.8M3.41
    30 June 20259.8M-15.9%6.8M1.45
    13 June 202511.7M-33.3%5.3M2.18
    30 May 202517.5M+6.0%2.4M7.27
    15 May 202516.5M+4.4%2.1M7.72
    30 April 202515.8M+4.4%3.1M5.09
    15 April 202515.1M+4.3%2.8M5.44
    31 March 202514.5M+0.3%1.4M10.50
    14 March 202514.5M-1.0%1.9M7.65
    28 February 202514.6M+1.0%2.1M6.85
    14 February 202514.5M-0.5%1.6M8.98
    31 January 202514.5M-3.6%1.9M7.75
    15 January 202515.1M-2.3%2.1M7.19
    31 December 202415.4M+18.7%1.8M8.63
    13 December 202413.0M+3.1%1.7M7.67
    29 November 202412.6M+4.3%1.5M8.29
    15 November 202412.1M-12.6%1.7M7.22
    31 October 202413.9M+1.1%1.1M12.56
    15 October 202413.7M+3.7%1.2M11.79
    30 September 202413.2M+8.1%2.0M6.52
    13 September 202412.2M-0.1%1.6M7.47
    30 August 202412.2M-9.4%2.5M4.84
    15 August 202413.5M-1.4%1.8M7.51
    31 July 202413.7M-7.9%1.7M8.30
    15 July 202414.9M+15.9%3.1M4.79
    28 June 202412.8M+10.9%3.3M3.84
    14 June 202411.6M+6.6%3.8M3.08
    31 May 202410.9M+9.3%7.4M1.46
    15 May 20249.9M+16.4%1.7M5.77
    30 April 20248.5M-9.3%2.2M3.82
    15 April 20249.4M+4.0%1.9M5.01
    28 March 20249.0M+2.3%1.2M7.37
    15 March 20248.8M+3.1%1.6M5.56
    29 February 20248.6M-7.1%1.7M4.92
    15 February 20249.2M-11.2%1.6M5.70
    31 January 202410.4M+9.2%1.7M6.17
    12 January 20249.5M-7.8%1.9M4.93
    29 December 202310.3M-14.9%1.2M8.61
    15 December 202312.1M+0.0%2.0M5.92
    30 November 202312.1M-14.4%1.4M8.88
    15 November 202314.2M-8.3%1.2M12.04
    31 October 202315.4M+13.4%1.4M10.74
    13 October 202313.6M+6.4%1.0M12.97
    29 September 202312.8M-6.5%1.2M10.81
    15 September 202313.7M+10.0%2.4M5.60
    31 August 202312.4M+11.9%1.0M12.04
    15 August 202311.1M+9.1%1.4M7.68
    31 July 202310.2M+5.6%1.0M9.83
    14 July 20239.6M+7.7%903K10.68
    30 June 20239.0M-4.5%984K9.11
    15 June 20239.4M+4.1%934K10.05
    31 May 20239.0M-2.7%1.0M8.79
    15 May 20239.3M+1.7%993K9.33
    28 April 20239.1M-8.1%1.2M7.62
    14 April 20239.9M-6.7%928K10.69
    31 March 202310.6M-3.7%1.3M8.14
    15 March 202311.0M+5.9%1.2M9.17
    28 February 202310.4M-2.4%1.5M7.04
    15 February 202310.7M-6.4%1.1M9.97
    31 January 202311.4M+6.0%1.2M9.20
    13 January 202310.8M+0.8%1.8M6.04
    30 December 202210.7M+16.0%1.3M7.99
    15 December 20229.2M+16.9%1.2M7.57
    30 November 20227.9M+6.0%1.2M6.74
    15 November 20227.4M-4.2%1.5M4.81
    31 October 20227.8M-10.3%2.6M2.96
    14 October 20228.7M+0.4%781K11.07
    30 September 20228.6M+7.2%939K9.17
    15 September 20228.0M+22.6%981K8.19
    31 August 20226.6M-3.2%1.2M5.41
    15 August 20226.8M-5.9%1.7M3.97
    29 July 20227.2M-20.6%799K9.01
    15 July 20229.1M-17.4%1.2M7.49
    30 June 202211.0M-4.1%1.2M9.40
    15 June 202211.4M+4.9%793K14.42
    31 May 202210.9M-0.9%1.2M8.74
    13 May 202211.0M-2.6%1.7M6.37
    29 April 202211.3M+0.8%922K12.25
    14 April 202211.2M+10.1%956K11.72
    31 March 202210.2M+1.3%836K12.18
    15 March 202210.0M-2.1%838K11.98
    28 February 202210.3M+2.9%1.0M10.04
    15 February 202210.0M+8.9%997K10.00
    31 January 20229.2M+29.8%1.1M8.67
    14 January 20227.1M-0.3%788K8.95
    31 December 20217.1M-4.6%621K11.39
    15 December 20217.4M+3.6%729K10.17
    30 November 20217.2M-0.3%698K10.24
    15 November 20217.2M-3.8%686K10.46
    29 October 20217.5M-18.8%1.1M6.85
    15 October 20219.2M+4.1%852K10.78
    30 September 20218.8M+1.5%901K9.80
    15 September 20218.7M-15.8%712K12.20
    31 August 202110.3M+7.0%644K16.03
    13 August 20219.6M+5.5%722K13.35
    30 July 20219.1M+12.7%860K10.63
    15 July 20218.1M-1.4%506K16.02
    30 June 20218.2M+0.8%965K8.52
    15 June 20218.2M+5.5%968K8.44
    28 May 20217.7M-5.9%1.1M7.21
    14 May 20218.2M+7.1%2.7M3.09
    30 April 20217.7M-12.2%561K13.69
    15 April 20218.7M-0.6%738K11.85
    31 March 20218.8M+2.5%885K9.94
    15 March 20218.6M+6.8%1.2M6.93
    26 February 20218.0M+0.2%721K11.15
    12 February 20218.0M-5.1%633K12.66
    29 January 20218.4M-6.9%849K9.96
    15 January 20219.1M-1.0%810K11.20
    31 December 20209.2M-4.4%828K11.08
    15 December 20209.6M-7.7%766K12.51
    30 November 202010.4M-9.7%664K15.64
    13 November 202011.5M+5.8%850K13.53
    30 October 202010.9M-7.3%804K13.53
    15 October 202011.7M+3.9%659K17.80
    30 September 202011.3M-2.7%1.0M10.77
    15 September 202011.6M-0.1%691K16.79
    31 August 202011.6M-6.5%436K26.64
    14 August 202012.4M-5.6%827K15.03
    31 July 202013.2M-3.7%444K29.66
    15 July 202013.7M-2.7%746K18.32
    30 June 202014.1M+3.1%1.1M12.93
    15 June 202013.6M+0.7%1.0M13.52
    29 May 202013.5M+2.6%827K16.37
    15 May 202013.2M-6.5%1.7M7.83
    30 April 202014.1M+4.7%994K14.20
    15 April 202013.5M+12.2%1.1M12.59
    31 March 202012.0M+9.5%1.6M7.72
    13 March 202011.0M-3.9%1.2M9.44
    28 February 202011.4M-1.9%1.3M8.78
    14 February 202011.6M-1.0%2.3M5.13
    31 January 202011.8M-9.2%829K14.18
    15 January 202012.9M-8.6%912K14.19
    31 December 201914.1M-8.9%649K21.81
    13 December 201915.5M-6.1%746K20.83
    29 November 201916.5M+3.8%896K18.47
    15 November 201916.0M-2.3%834K19.11
    31 October 201916.3M-4.2%1.4M12.05
    15 October 201917.0M-0.8%806K21.12
    30 September 201917.2M+18.0%1.6M10.97
    13 September 201914.5M+2.0%1.1M13.50
    30 August 201914.3M+4.2%863K16.52
    15 August 201913.7M+18.7%1.9M7.26
    31 July 201911.5M+1.7%1.1M10.52
    15 July 201911.3M-7.0%964K11.76
    28 June 201912.2M+5.8%1.2M10.30
    14 June 201911.5M+0.9%945K12.20
    31 May 201911.4M+3.8%1.5M7.45
    15 May 201911.0M+9.1%712K15.46
    30 April 201910.1M+0.7%645K15.64
    15 April 201910.0M+3.1%764K13.11
    29 March 20199.7M-5.4%584K16.64
    15 March 201910.3M-0.3%725K14.19
    28 February 201910.3M-4.9%1.4M7.39
    15 February 201910.8M+2.5%708K15.31
    31 January 201910.6M-7.0%972K10.89
    15 January 201911.4M-2.7%1.8M6.40
    31 December 201811.7M-4.8%1.1M10.93
    14 December 201812.3M+1.0%707K17.37
    30 November 201812.2M-5.2%706K17.22
    15 November 201812.8M+2.9%981K13.08
    31 October 201812.5M-0.4%811K15.38
    15 October 201812.5M+18.3%2.0M6.15
    28 September 201810.6M+4.6%1.2M9.06
    14 September 201810.1M-2.1%467K21.66
    31 August 201810.3M-2.1%616K16.79
    15 August 201810.6M-0.0%1.8M5.76
    31 July 201810.6M-0.0%585K18.05
    13 July 201810.6M-0.4%491K21.51
    29 June 201810.6M-10.7%743K14.27
    15 June 201811.9M+5.7%580K20.49
    31 May 201811.2M+0.3%666K16.87
    15 May 201811.2M+6.1%662K16.93
    30 April 201810.6M+8.2%686K15.41
    13 April 20189.8M+2.8%910K10.73
    29 March 20189.5M+8.5%786K12.09
    15 March 20188.8M+2.0%628K13.95
    28 February 20188.6M+12.2%1.1M7.70
    15 February 20187.7M+18.7%836K9.15
    31 January 20186.4M+10.3%1.2M5.24
    12 January 20185.8M+8.0%712K8.21
    29 December 20175.4M608K8.90
    Shares in millions (M) or thousands (K); hold the pointer on a figure for the exact count. FINRA publishes consolidated short interest twice a month, about ten days after each settlement.