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White Mountains Insurance Group Ltd. short interest

147K shares of White Mountains Insurance Group were sold short at the 15 October 2026 settlement, the most at any settlement since 29 Dec 2017, when our record starts. Short sellers would need 7.3 days of normal trading to buy them back.

Shares sold short147Kat 15 Oct 2026
Change on the settlement before+5.2%+55% over a year
Days to cover7.30at 20K shares a day
Of shares in issue6.15%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 at any settlement since 29 Dec 2017, when our record starts, and the share price moved +17% 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 2026147K+5.2%20K7.30
    30 September 2026140K+3.1%19K7.43
    15 September 2026135K+2.8%22K6.17
    31 August 2026132K-3.4%20K6.47
    14 August 2026136K-0.5%24K5.67
    31 July 2026137K-1.0%16K8.53
    15 July 2026138K+10.9%19K7.38
    30 June 2026125K+4.6%18K6.87
    15 June 2026119K+31.1%26K4.52
    29 May 202691K+3.4%22K4.13
    15 May 202688K+12.7%24K3.69
    30 April 202678K+8.8%13K5.92
    15 April 202672K-12.8%19K3.84
    31 March 202682K-6.1%18K4.59
    13 March 202688K+16.6%21K4.13
    27 February 202675K+8.2%16K4.61
    13 February 202669K-14.7%18K3.90
    30 January 202681K+12.9%16K5.12
    15 January 202672K+11.3%19K3.86
    31 December 202565K-25.6%18K3.55
    15 December 202587K-20.7%22K3.97
    28 November 2025110K+15.1%19K5.80
    14 November 202595K-11.5%23K4.19
    31 October 2025108K+14.0%26K4.19
    15 October 202595K+16.8%38K2.49
    30 September 202581K+23.6%35K2.30
    15 September 202566K+1.6%36K1.84
    29 August 202565K-9.1%27K2.43
    15 August 202571K+23.7%30K2.38
    31 July 202557K-5.4%19K3.03
    15 July 202561K+3.7%32K1.91
    30 June 202558K+8.7%22K2.63
    13 June 202554K+0.9%23K2.31
    30 May 202553K-2.9%20K2.71
    15 May 202555K+2.9%12K4.66
    30 April 202553K+0.2%13K4.08
    15 April 202553K-0.8%24K2.23
    31 March 202554K-22.1%15K3.64
    14 March 202569K+17.0%18K3.79
    28 February 202559K+13.6%12K4.71
    14 February 202552K-1.1%13K4.12
    31 January 202552K+24.9%15K3.45
    15 January 202542K-10.3%15K2.75
    31 December 202447K+30.1%14K3.35
    13 December 202436K+5.8%12K3.10
    29 November 202434K-13.8%8K4.20
    15 November 202439K-9.0%15K2.54
    31 October 202443K+3.7%12K3.73
    15 October 202442K+2.2%9K4.88
    30 September 202441K+9.1%11K3.57
    13 September 202437K-2.7%11K3.55
    30 August 202439K-6.9%11K3.46
    15 August 202441K+6.6%9K4.55
    31 July 202439K-13.6%10K3.87
    15 July 202445K+15.8%15K3.09
    28 June 202439K+14.4%32K1.23
    14 June 202434K-6.2%13K2.63
    31 May 202436K+15.4%11K3.38
    15 May 202431K-16.7%11K2.77
    30 April 202438K+1.9%8K4.53
    15 April 202437K+11.0%8K4.71
    28 March 202433K+9.9%8K4.38
    15 March 202430K-9.9%8K3.76
    29 February 202434K-1.0%9K3.91
    15 February 202434K+22.4%10K3.51
    31 January 202428K-6.7%9K3.24
    12 January 202430K-7.4%7K4.36
    29 December 202332K-15.0%11K3.01
    15 December 202338K+5.4%9K4.17
    30 November 202336K+0.4%9K4.12
    15 November 202336K-0.6%9K3.76
    31 October 202336K-4.2%10K3.59
    13 October 202337K+7.3%11K3.37
    29 September 202335K+7.0%10K3.49
    15 September 202333K+2.6%8K4.23
    31 August 202332K+11.0%8K4.11
    15 August 202329K-2.1%9K3.25
    31 July 202329K+13.6%7K4.01
    14 July 202326K+9.9%10K2.68
    30 June 202323K+19.1%9K2.64
    15 June 202320K-0.7%8K2.32
    31 May 202320K-1.7%11K1.86
    15 May 202320K-22.3%8K2.37
    28 April 202326K-0.1%13K2.00
    14 April 202326K-13.0%10K2.57
    31 March 202330K+2.6%13K2.26
    15 March 202329K-15.1%11K2.55
    28 February 202334K-4.1%11K3.11
    15 February 202336K+4.1%11K3.21
    31 January 202334K-9.4%11K3.18
    13 January 202338K-1.9%8K4.69
    30 December 202239K+4.5%14K2.72
    15 December 202237K+0.0%11K3.26
    30 November 202237K-18.1%12K3.09
    15 November 202245K-7.7%9K5.22
    31 October 202249K-10.4%10K4.69
    14 October 202255K+1.5%9K5.89
    30 September 202254K+7.3%27K1.96
    15 September 202250K-2.0%19K2.60
    31 August 202251K+13.7%14K3.56
    15 August 202245K-9.3%11K4.17
    29 July 202250K+12.6%12K4.16
    15 July 202244K-10.9%17K2.66
    30 June 202249K+12.2%23K2.16
    15 June 202244K-11.0%14K3.14
    31 May 202249K+14.8%15K3.36
    13 May 202243K+5.7%17K2.56
    29 April 202241K-7.7%14K2.87
    14 April 202244K-1.0%20K2.18
    31 March 202245K-19.2%14K3.29
    15 March 202255K+44.3%14K3.89
    28 February 202238K+2.1%18K2.15
    15 February 202237K+30.7%14K2.75
    31 January 202229K+19.5%16K1.83
    14 January 202224K+22.5%18K1.34
    31 December 202120K-20.8%17K1.16
    15 December 202125K+5.2%20K1.27
    30 November 202124K-12.7%13K1.76
    15 November 202127K-18.0%10K2.68
    29 October 202133K-4.6%9K3.86
    15 October 202134K+0.2%15K2.36
    30 September 202134K+30.0%18K1.88
    15 September 202126K+25.3%18K1.50
    31 August 202121K-21.3%14K1.50
    13 August 202127K-3.6%13K2.09
    30 July 202128K-8.4%14K1.97
    15 July 202130K-1.8%13K2.33
    30 June 202131K-0.1%18K1.74
    15 June 202131K-2.2%20K1.58
    28 May 202132K-14.1%19K1.71
    14 May 202137K+2.4%21K1.78
    30 April 202136K+10.1%17K2.08
    15 April 202133K-8.1%22K1.48
    31 March 202136K+34.7%24K1.47
    15 March 202126K+27.5%81K1.00
    26 February 202121K-28.7%17K1.21
    12 February 202129K+34.3%17K1.69
    29 January 202122K+18.0%18K1.21
    15 January 202118K-8.5%17K1.10
    31 December 202020K-0.6%11K1.77
    15 December 202020K-13.9%9K2.26
    30 November 202023K-0.7%14K1.70
    13 November 202024K-13.4%12K1.92
    30 October 202027K-5.2%17K1.59
    15 October 202029K+12.1%19K1.53
    30 September 202026K-13.0%19K1.37
    15 September 202029K+34.0%12K2.55
    31 August 202022K-40.5%10K2.16
    14 August 202037K-4.0%10K3.88
    31 July 202038K+5.4%9K4.50
    15 July 202037K+8.5%18K2.00
    30 June 202034K+11.6%25K1.36
    15 June 202030K+16.6%17K1.73
    29 May 202026K+1.3%12K2.20
    15 May 202026K+11.7%13K2.00
    30 April 202023K-21.2%18K1.28
    15 April 202029K-1.8%22K1.32
    31 March 202030K-2.8%37K1.00
    13 March 202030K+90.2%16K1.87
    28 February 202016K-23.3%11K1.47
    14 February 202021K-28.9%8K2.57
    31 January 202029K-11.5%8K3.65
    15 January 202033K-6.5%8K4.03
    31 December 201935K+35.2%9K3.91
    13 December 201926K-29.5%7K3.74
    29 November 201937K+3.3%10K3.64
    15 November 201936K-12.2%9K3.82
    31 October 201941K+33.9%15K2.68
    15 October 201931K-26.0%23K1.33
    30 September 201941K-8.2%23K1.78
    13 September 201945K+7.0%22K2.06
    30 August 201942K-7.8%20K2.11
    15 August 201946K+14.3%16K2.79
    31 July 201940K-22.0%14K2.78
    15 July 201951K-19.3%17K2.96
    28 June 201963K-0.1%25K2.50
    14 June 201963K-6.5%15K4.19
    31 May 201968K-2.8%12K5.46
    15 May 201970K+0.8%15K4.55
    30 April 201969K+2.3%10K7.15
    15 April 201968K+2.4%9K7.74
    29 March 201966K-5.9%12K5.70
    15 March 201970K+53.4%12K6.02
    28 February 201946K+40.7%8K5.42
    15 February 201933K-4.0%14K2.41
    31 January 201934K+2.9%11K2.98
    15 January 201933K-31.4%15K2.13
    31 December 201848K+62.9%16K2.92
    14 December 201830K-10.5%18K1.66
    30 November 201833K-24.3%10K3.36
    15 November 201844K+15.5%13K3.27
    31 October 201838K-2.9%12K3.10
    15 October 201839K-10.1%10K3.86
    28 September 201843K-10.5%20K2.13
    14 September 201848K+2.3%10K4.90
    31 August 201847K-4.0%13K3.53
    15 August 201849K+12.3%16K3.00
    31 July 201844K+33.5%10K4.26
    13 July 201833K-19.8%13K2.47
    29 June 201841K+5.6%35K1.16
    15 June 201839K-2.3%30K1.27
    31 May 201840K-37.0%38K1.03
    15 May 201863K+64.3%69K1.00
    30 April 201838K-10.9%46K1.00
    13 April 201843K-12.7%48K1.00
    29 March 201849K-9.2%37K1.34
    15 March 201854K+3.2%23K2.37
    28 February 201853K-3.3%20K2.68
    15 February 201854K+16.8%28K1.92
    31 January 201846K-1.4%16K2.84
    12 January 201847K+52.4%18K2.69
    29 December 201731K18K1.75
    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.