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Mirum Pharmaceuticals, Inc. short interest

6.7M shares of Mirum Pharmaceuticals were sold short at the 15 October 2026 settlement, near the bottom of its range over the last year (6.2M to 8.4M). Short sellers would need 7.3 days of normal trading to buy them back.

Shares sold short6.7Mat 15 Oct 2026
Change on the settlement before-4.6%-10% over a year
Days to cover7.30at 913K shares a day
Of shares in issue10.29%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 bottom of its range over the last year (6.2M to 8.4M), and the share price moved +12% 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

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    Every settlement since 31 Jul 2019 as a table
    SettlementShares shortChangeAverage daily volumeDays to cover
    15 October 20266.7M-4.6%913K7.30
    30 September 20267.0M+11.2%911K7.67
    15 September 20266.3M+1.8%524K11.99
    31 August 20266.2M-4.9%467K13.21
    14 August 20266.5M-4.9%893K7.27
    31 July 20266.8M-6.2%566K12.05
    15 July 20267.3M-2.8%686K10.59
    30 June 20267.5M+8.3%1.5M5.02
    15 June 20266.9M+5.3%615K11.24
    29 May 20266.6M-20.0%828K7.92
    15 May 20268.2M-2.6%1.7M4.83
    30 April 20268.4M+2.4%574K14.67
    15 April 20268.2M+2.0%655K12.54
    31 March 20268.1M+7.9%1.2M6.84
    13 March 20267.5M-2.1%824K9.06
    27 February 20267.6M-5.2%782K9.75
    13 February 20268.0M+3.2%632K12.73
    30 January 20267.8M+2.7%816K9.55
    15 January 20267.6M-9.2%898K8.46
    31 December 20258.4M+13.4%920K9.09
    15 December 20257.4M-1.2%691K10.67
    28 November 20257.5M-2.6%410K18.19
    14 November 20257.7M+9.0%773K9.91
    31 October 20257.0M-4.9%419K16.75
    15 October 20257.4M+0.3%739K10.00
    30 September 20257.4M-1.8%884K8.33
    15 September 20257.5M+9.3%531K14.13
    29 August 20256.9M-0.9%903K7.60
    15 August 20256.9M+4.4%952K7.27
    31 July 20256.6M+0.8%308K21.51
    15 July 20256.6M+1.0%467K14.08
    30 June 20256.5M+4.7%474K13.73
    13 June 20256.2M+2.6%441K14.09
    30 May 20256.1M-3.6%305K19.90
    15 May 20256.3M+1.0%476K13.20
    30 April 20256.2M-0.9%359K17.35
    15 April 20256.3M-4.5%512K12.27
    31 March 20256.6M+4.7%438K15.02
    14 March 20256.3M-5.2%536K11.71
    28 February 20256.6M+0.3%666K9.95
    14 February 20256.6M+0.5%450K14.69
    31 January 20256.6M-1.1%531K12.37
    15 January 20256.6M+3.4%493K13.50
    31 December 20246.4M-6.0%376K17.12
    13 December 20246.8M+1.9%377K18.13
    29 November 20246.7M-3.7%381K17.64
    15 November 20247.0M+1.9%460K15.16
    31 October 20246.8M-2.2%271K25.30
    15 October 20247.0M-2.2%326K21.46
    30 September 20247.2M+1.6%491K14.57
    13 September 20247.1M-1.0%283K24.91
    30 August 20247.1M+3.7%412K17.29
    15 August 20246.9M-5.7%485K14.17
    31 July 20247.3M-10.8%796K9.15
    15 July 20248.2M+14.4%638K12.81
    28 June 20247.1M-8.4%1.7M4.09
    14 June 20247.8M-12.3%652K11.97
    31 May 20248.9M+0.9%432K20.61
    15 May 20248.8M+3.6%400K22.02
    30 April 20248.5M-0.8%393K21.66
    15 April 20248.6M+5.1%470K18.23
    28 March 20248.2M+0.3%538K15.18
    15 March 20248.1M+6.2%640K12.71
    29 February 20247.7M-1.5%415K18.44
    15 February 20247.8M-0.9%479K16.25
    31 January 20247.9M+8.1%635K12.37
    12 January 20247.3M+0.5%842K8.63
    29 December 20237.2M+4.2%938K7.71
    15 December 20236.9M+12.5%715K9.70
    30 November 20236.2M-3.0%502K12.30
    15 November 20236.4M+4.6%617K10.30
    31 October 20236.1M-2.5%324K18.75
    13 October 20236.2M+4.8%357K17.50
    29 September 20236.0M+8.2%463K12.85
    15 September 20235.5M+8.2%1.1M5.16
    31 August 20235.1M+0.6%291K17.47
    15 August 20235.1M+24.6%480K10.52
    31 July 20234.1M+35.3%850K4.77
    14 July 20233.0M-8.1%345K8.69
    30 June 20233.3M+10.0%639K5.10
    15 June 20233.0M+0.7%536K5.53
    31 May 20232.9M-7.2%379K7.76
    15 May 20233.2M+1.5%409K7.76
    28 April 20233.1M+4.6%564K5.54
    14 April 20233.0M+69.5%1.3M2.27
    31 March 20231.8M-10.0%256K6.88
    15 March 20232.0M+6.8%293K6.69
    28 February 20231.8M-2.3%240K7.65
    15 February 20231.9M+14.3%256K7.32
    31 January 20231.6M+43.3%396K4.15
    13 January 20231.1M+8.8%387K2.96
    30 December 20221.1M-12.7%323K3.26
    15 December 20221.2M-19.2%383K3.15
    30 November 20221.5M-11.7%258K5.79
    15 November 20221.7M-7.8%403K4.20
    31 October 20221.8M-10.3%310K5.92
    14 October 20222.0M-18.4%622K3.29
    30 September 20222.5M+6.2%463K5.42
    15 September 20222.4M+1.2%355K6.66
    31 August 20222.3M+8.1%226K10.35
    15 August 20222.2M+1.8%569K3.80
    29 July 20222.1M+0.5%135K15.76
    15 July 20222.1M+4.9%146K14.47
    30 June 20222.0M+22.2%394K5.10
    15 June 20221.6M+16.4%211K7.79
    31 May 20221.4M+67.4%284K4.98
    13 May 2022846K+13.7%233K3.63
    29 April 2022744K+14.0%117K6.38
    14 April 2022653K+19.8%149K4.37
    31 March 2022545K-27.2%139K3.91
    15 March 2022749K+55.7%207K3.61
    28 February 2022481K+2.7%190K2.54
    15 February 2022468K-18.1%189K2.47
    31 January 2022572K+20.3%242K2.36
    14 January 2022476K+5.2%120K3.95
    31 December 2021452K-0.5%121K3.75
    15 December 2021454K+10.4%129K3.52
    30 November 2021412K+13.6%174K2.36
    15 November 2021363K-19.9%121K3.00
    29 October 2021452K-3.6%179K2.52
    15 October 2021469K-2.1%263K1.79
    30 September 2021479K+17.3%515K1.00
    15 September 2021408K-11.6%122K3.35
    31 August 2021462K+5.1%61K7.58
    13 August 2021439K+10.8%75K5.83
    30 July 2021396K-43.4%79K5.00
    15 July 2021700K+3.8%63K11.07
    30 June 2021674K-10.4%99K6.79
    15 June 2021752K+5.8%106K7.12
    28 May 2021711K-4.1%71K10.00
    14 May 2021741K-1.6%58K12.67
    30 April 2021753K-2.1%53K14.11
    15 April 2021769K-1.9%88K8.73
    31 March 2021784K+9.4%139K5.64
    15 March 2021717K+6.3%162K4.43
    26 February 2021674K+5.7%119K5.68
    12 February 2021638K-0.2%109K5.86
    29 January 2021639K-35.8%94K6.81
    15 January 2021996K-2.1%192K5.19
    31 December 20201.0M+26.3%333K3.06
    15 December 2020806K+13.7%91K8.87
    30 November 2020709K+7.0%53K13.40
    13 November 2020663K+1.8%46K14.37
    30 October 2020651K+5.4%50K13.01
    15 October 2020618K-1.4%40K15.26
    30 September 2020626K+5.0%59K10.54
    15 September 2020597K-1.6%99K6.04
    31 August 2020606K+4.3%44K13.70
    14 August 2020582K-4.2%96K6.04
    31 July 2020607K-6.7%42K14.49
    15 July 2020651K+2.0%41K15.75
    30 June 2020638K+17.3%108K5.90
    15 June 2020544K+0.7%148K3.66
    29 May 2020540K-0.9%101K5.36
    15 May 2020545K+1.8%50K11.00
    30 April 2020535K+3.2%30K17.74
    15 April 2020519K-1.2%32K16.39
    31 March 2020525K-15.0%82K6.42
    13 March 2020618K-4.3%65K9.54
    28 February 2020645K+5.7%88K7.33
    14 February 2020610K+27.2%85K7.22
    31 January 2020480K+20.1%125K3.83
    15 January 2020400K+48.7%266K1.50
    31 December 2019269K+139.5%1.5M1.00
    13 December 2019112K+15.6%87K1.28
    29 November 201997K-2.2%118K1.00
    15 November 201999K-2.3%36K2.74
    31 October 2019102K+62.0%30K3.39
    15 October 201963K+65.4%19K3.38
    30 September 201938K-32.5%57K1.00
    13 September 201956K-56.0%45K1.24
    30 August 2019128K-3.1%41K3.14
    15 August 2019132K+124.4%67K1.96
    31 July 201959K189K1.00
    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.