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Rhythm Pharmaceuticals, Inc. short interest

11.0M shares of Rhythm Pharmaceuticals were sold short at the 15 October 2026 settlement, the most since 14 Jun 2024. Short sellers would need 13.5 days of normal trading to buy them back.

Shares sold short11.0Mat 15 Oct 2026
Change on the settlement before+2.2%+97% over a year
Days to cover13.48at 816K shares a day
Of shares in issue15.99%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 the most since 14 Jun 2024, and the share price moved -16% 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 202611.0M+2.2%816K13.48
    30 September 202610.8M+4.7%762K14.14
    15 September 202610.3M-0.1%513K20.06
    31 August 202610.3M+1.5%471K21.89
    14 August 202610.2M+7.6%830K12.24
    31 July 20269.4M-1.4%584K16.17
    15 July 20269.6M-0.9%697K13.74
    30 June 20269.7M+20.7%1.3M7.57
    15 June 20268.0M+1.2%691K11.58
    29 May 20267.9M-4.5%535K14.78
    15 May 20268.3M+2.8%1.0M8.28
    30 April 20268.1M+2.9%554K14.55
    15 April 20267.8M+2.7%611K12.81
    31 March 20267.6M+16.7%1.3M5.93
    13 March 20266.5M+3.4%861K7.59
    27 February 20266.3M+5.0%694K9.10
    13 February 20266.0M-3.4%762K7.90
    30 January 20266.2M-0.8%529K11.80
    15 January 20266.3M+1.4%637K9.87
    31 December 20256.2M+11.1%771K8.04
    15 December 20255.6M+1.1%1.1M4.98
    28 November 20255.5M+0.3%647K8.53
    14 November 20255.5M+5.2%786K7.00
    31 October 20255.2M-6.2%566K9.24
    15 October 20255.6M-0.1%528K10.56
    30 September 20255.6M+6.8%713K7.83
    15 September 20255.2M+5.1%609K8.57
    29 August 20255.0M+6.3%507K9.80
    15 August 20254.7M+3.5%627K7.45
    31 July 20254.5M-5.7%546K8.27
    15 July 20254.8M-1.3%1.4M3.48
    30 June 20254.9M+2.0%569K8.53
    13 June 20254.8M-0.4%589K8.08
    30 May 20254.8M-5.8%516K9.25
    15 May 20255.1M+4.5%727K6.97
    30 April 20254.9M-5.0%636K7.63
    15 April 20255.1M+9.7%1.2M4.14
    31 March 20254.7M-1.1%523K8.90
    14 March 20254.7M-8.5%562K8.39
    28 February 20255.1M-4.9%568K9.05
    14 February 20255.4M+5.5%399K13.55
    31 January 20255.1M-6.0%472K10.87
    15 January 20255.5M+3.6%550K9.91
    31 December 20245.3M-9.4%583K9.02
    13 December 20245.8M-8.8%470K12.36
    29 November 20246.4M-5.1%522K12.19
    15 November 20246.7M-19.7%930K7.21
    31 October 20248.4M-1.2%311K26.85
    15 October 20248.5M+2.7%300K28.16
    30 September 20248.2M-11.8%535K15.40
    13 September 20249.3M-3.1%418K22.36
    30 August 20249.6M-2.4%334K28.83
    15 August 20249.9M-3.0%403K24.51
    31 July 202410.2M+1.2%465K21.88
    15 July 202410.1M+8.9%449K22.44
    28 June 20249.2M-16.3%700K13.20
    14 June 202411.0M+1.1%562K19.65
    31 May 202410.9M+5.8%448K24.38
    15 May 202410.3M-2.5%686K15.05
    30 April 202410.6M+3.8%442K23.96
    15 April 202410.2M+4.8%518K19.68
    28 March 20249.7M+5.9%603K16.16
    15 March 20249.2M+2.1%589K15.62
    29 February 20249.0M+2.8%536K16.80
    15 February 20248.8M-1.2%692K12.66
    31 January 20248.9M+5.0%667K13.30
    12 January 20248.4M+3.8%853K9.90
    29 December 20238.1M-5.8%771K10.56
    15 December 20238.6M-6.7%958K9.02
    30 November 20239.3M-1.7%572K16.17
    15 November 20239.4M-19.2%766K12.29
    31 October 202311.7M-1.2%427K27.30
    13 October 202311.8M+16.9%517K22.81
    29 September 202310.1M-15.8%520K19.40
    15 September 202312.0M+12.5%689K17.38
    31 August 202310.7M-2.8%621K17.15
    15 August 202311.0M-11.7%1.2M8.90
    31 July 202312.4M+8.0%500K24.80
    14 July 202311.5M+4.4%616K18.64
    30 June 202311.0M+10.7%1.4M7.87
    15 June 20239.9M+2.5%360K27.55
    31 May 20239.7M+8.1%648K14.95
    15 May 20239.0M+6.1%787K11.39
    28 April 20238.5M+3.5%541K15.64
    14 April 20238.2M+1.6%560K14.59
    31 March 20238.0M+8.8%713K11.27
    15 March 20237.4M-9.0%967K7.64
    28 February 20238.1M-0.4%467K17.38
    15 February 20238.1M+5.2%397K20.52
    31 January 20237.7M-2.4%591K13.09
    13 January 20237.9M+1.2%649K12.23
    30 December 20227.8M-3.1%562K13.95
    15 December 20228.1M+2.8%619K13.07
    30 November 20227.9M-6.8%501K15.69
    15 November 20228.4M+0.5%791K10.67
    31 October 20228.4M+10.2%602K13.94
    14 October 20227.6M-0.2%828K9.19
    30 September 20227.6M+26.5%1.7M4.46
    15 September 20226.0M+3.9%1.8M3.37
    31 August 20225.8M+3.7%849K6.84
    15 August 20225.6M-22.6%1.9M2.91
    29 July 20227.2M+21.7%3.9M1.85
    15 July 20225.9M+87.6%5.0M1.18
    30 June 20223.2M-13.6%3.0M1.06
    15 June 20223.7M+2.0%716K5.12
    31 May 20223.6M+16.0%519K6.92
    13 May 20223.1M-9.5%634K4.89
    29 April 20223.4M-7.2%243K14.07
    14 April 20223.7M-1.6%367K10.06
    31 March 20223.7M-22.3%721K5.20
    15 March 20224.8M+5.9%476K10.13
    28 February 20224.6M+4.2%982K4.64
    15 February 20224.4M+5.6%628K6.97
    31 January 20224.1M+5.2%350K11.85
    14 January 20223.9M+1.0%321K12.27
    31 December 20213.9M+2.0%477K8.17
    15 December 20213.8M+3.0%348K10.98
    30 November 20213.7M-1.2%364K10.19
    15 November 20213.8M-3.9%269K13.95
    29 October 20213.9M+0.2%331K11.82
    15 October 20213.9M+4.8%337K11.59
    30 September 20213.7M-0.1%243K15.32
    15 September 20213.7M-9.7%213K17.52
    31 August 20214.1M-6.2%214K19.28
    13 August 20214.4M-7.7%491K8.95
    30 July 20214.8M+9.3%274K17.36
    15 July 20214.4M+15.4%317K13.74
    30 June 20213.8M-1.7%520K7.27
    15 June 20213.8M+11.7%364K10.56
    28 May 20213.4M-2.8%264K13.02
    14 May 20213.5M-2.9%253K14.00
    30 April 20213.6M-0.5%289K12.62
    15 April 20213.7M-12.0%334K10.97
    31 March 20214.2M+54.4%580K7.18
    15 March 20212.7M-1.4%337K8.02
    26 February 20212.7M-6.9%406K6.74
    12 February 20212.9M-1.1%528K5.56
    29 January 20213.0M-15.5%559K5.32
    15 January 20213.5M+27.3%345K10.19
    31 December 20202.8M+56.2%440K6.28
    15 December 20201.8M-14.5%423K4.18
    30 November 20202.1M+8.6%369K5.60
    13 November 20201.9M+6.5%187K10.17
    30 October 20201.8M-12.1%172K10.41
    15 October 20202.0M+1.0%221K9.22
    30 September 20202.0M-2.5%272K7.40
    15 September 20202.1M+8.5%427K4.84
    31 August 20201.9M-0.8%319K5.97
    14 August 20201.9M-2.1%137K13.96
    31 July 20202.0M+2.3%133K14.74
    15 July 20201.9M+9.2%145K13.27
    30 June 20201.8M+4.2%308K5.70
    15 June 20201.7M+7.6%149K11.28
    29 May 20201.6M-13.3%146K10.70
    15 May 20201.8M+25.8%170K10.63
    30 April 20201.4M-16.3%202K7.12
    15 April 20201.7M-12.6%269K6.38
    31 March 20202.0M+23.0%301K6.52
    13 March 20201.6M-30.9%240K6.66
    28 February 20202.3M+33.9%200K11.56
    14 February 20201.7M-12.7%138K12.51
    31 January 20202.0M-7.2%232K8.50
    15 January 20202.1M-28.0%197K10.83
    31 December 20193.0M+15.5%274K10.81
    13 December 20192.6M-2.3%276K9.26
    29 November 20192.6M+3.3%319K8.21
    15 November 20192.5M-12.0%215K11.80
    31 October 20192.9M-14.1%429K6.71
    15 October 20193.4M+1.3%176K19.00
    30 September 20193.3M+30.2%199K16.66
    13 September 20192.5M-1.7%234K10.86
    30 August 20192.6M-14.2%156K16.55
    15 August 20193.0M+106.9%505K5.97
    31 July 20191.5M-14.4%168K8.67
    15 July 20191.7M+41.4%235K7.25
    28 June 20191.2M-17.8%270K4.46
    14 June 20191.5M-6.2%123K11.93
    31 May 20191.6M+9.3%143K10.88
    15 May 20191.4M+2.9%94K15.15
    30 April 20191.4M-2.8%82K16.92
    15 April 20191.4M+6.8%70K20.41
    29 March 20191.3M+4.9%103K12.98
    15 March 20191.3M-14.1%87K14.71
    28 February 20191.5M-0.4%63K23.61
    15 February 20191.5M-3.8%58K25.49
    31 January 20191.5M+14.5%85K18.26
    15 January 20191.4M-2.3%123K11.01
    31 December 20181.4M+8.7%222K6.22
    14 December 20181.3M-14.6%122K10.42
    30 November 20181.5M+18.9%103K14.51
    15 November 20181.3M-0.9%126K9.97
    31 October 20181.3M+39.4%126K10.00
    15 October 2018906K-33.0%179K5.07
    28 September 20181.4M+44.2%367K3.69
    14 September 2018937K+19.7%115K8.17
    31 August 2018783K-12.4%138K5.69
    15 August 2018894K+36.0%119K7.51
    31 July 2018658K-13.1%138K4.77
    13 July 2018756K-36.0%308K2.45
    29 June 20181.2M+127.4%824K1.44
    15 June 2018520K-31.8%164K3.17
    31 May 2018763K-2.5%200K3.82
    15 May 2018782K+9.7%156K5.02
    30 April 2018713K-12.3%61K11.71
    13 April 2018814K+5.8%133K6.10
    29 March 2018769K-27.3%101K7.61
    15 March 20181.1M+26.3%98K10.76
    28 February 2018838K-0.5%42K19.81
    15 February 2018842K+56.7%73K11.53
    31 January 2018537K-20.1%85K6.30
    12 January 2018673K-12.5%76K8.86
    29 December 2017769K136K5.67
    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.