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Stock research / United States / AON / Short interest

Aon plc short interest

3.4M shares of Aon were sold short at the 15 October 2026 settlement, near the middle of its range over the last year (1.9M to 4.9M). Short sellers would need 2.0 days of normal trading to buy them back.

Shares sold short3.4Mat 15 Oct 2026
Change on the settlement before-19.6%+68% over a year
Days to cover1.97at 1.7M shares a day
Of shares in issue1.60%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 (1.9M to 4.9M), and the share price moved -6% 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 29 Dec 2017 as a table
    SettlementShares shortChangeAverage daily volumeDays to cover
    15 October 20263.4M-19.6%1.7M1.97
    30 September 20264.2M+14.3%2.4M1.76
    15 September 20263.7M-2.2%2.1M1.75
    31 August 20263.8M+12.2%851K4.44
    14 August 20263.4M-31.5%936K3.60
    31 July 20264.9M+8.0%1.6M3.05
    15 July 20264.6M+23.2%1.1M4.04
    30 June 20263.7M+2.9%2.3M1.61
    15 June 20263.6M+20.0%1.5M2.41
    29 May 20263.0M+4.8%1.5M1.97
    15 May 20262.9M+20.4%1.6M1.83
    30 April 20262.4M-2.1%1.3M1.89
    15 April 20262.4M-2.6%1.3M1.80
    31 March 20262.5M+13.7%1.3M1.87
    13 March 20262.2M-3.7%1.5M1.47
    27 February 20262.3M+3.1%1.4M1.59
    13 February 20262.2M+8.5%2.3M1.00
    30 January 20262.0M+4.1%1.4M1.40
    15 January 20261.9M+1.3%952K2.05
    31 December 20251.9M+1.7%799K2.41
    15 December 20251.9M-7.1%998K1.90
    28 November 20252.0M+5.1%1.2M1.72
    14 November 20251.9M+2.9%1.2M1.64
    31 October 20251.9M-7.0%1.5M1.26
    15 October 20252.0M-2.6%891K2.27
    30 September 20252.1M-2.7%1.5M1.42
    15 September 20252.1M+16.1%1.0M2.07
    29 August 20251.8M-17.0%1.1M1.71
    15 August 20252.2M-26.2%1.4M1.53
    31 July 20253.0M-34.9%1.5M1.94
    15 July 20254.6M-10.9%1.1M4.12
    30 June 20255.2M+4.5%1.6M3.28
    13 June 20255.0M-0.6%1.2M4.07
    30 May 20255.0M-0.2%1.1M4.63
    15 May 20255.0M+2.6%1.3M3.99
    30 April 20254.9M+11.4%2.1M2.28
    15 April 20254.4M-9.5%1.6M2.71
    31 March 20254.8M-11.5%1.2M3.95
    14 March 20255.5M-1.2%1.4M3.80
    28 February 20255.5M+8.9%1.3M4.38
    14 February 20255.1M+13.9%880K5.76
    31 January 20254.5M-3.3%1.2M3.67
    15 January 20254.6M+0.8%989K4.65
    31 December 20244.6M+6.5%765K5.97
    13 December 20244.3M-10.5%1.3M3.38
    29 November 20244.8M+1.4%887K5.40
    15 November 20244.7M+0.7%1.2M4.02
    31 October 20244.7M-0.2%1.1M4.34
    15 October 20244.7M+3.0%879K5.35
    30 September 20244.6M+7.5%803K5.68
    13 September 20244.2M-3.6%786K5.39
    30 August 20244.4M+5.3%722K6.09
    15 August 20244.2M+3.8%1.1M3.85
    31 July 20244.0M+20.1%1.5M2.77
    15 July 20243.3M-8.2%1.0M3.24
    28 June 20243.6M+14.6%2.2M1.68
    14 June 20243.2M+5.1%1.6M1.96
    31 May 20243.0M-11.0%1.5M2.01
    15 May 20243.4M+43.1%1.7M1.99
    30 April 20242.4M+21.2%1.8M1.33
    15 April 20242.0M+5.8%941K2.08
    28 March 20241.9M+5.0%854K2.17
    15 March 20241.8M-1.2%721K2.45
    29 February 20241.8M-1.9%781K2.29
    15 February 20241.8M+0.1%1.3M1.45
    31 January 20241.8M+8.7%1.3M1.40
    12 January 20241.7M-7.1%1.1M1.58
    29 December 20231.8M-2.9%1.4M1.30
    15 December 20231.9M+6.4%1.2M1.49
    30 November 20231.7M-7.7%901K1.94
    15 November 20231.9M+9.4%819K2.31
    31 October 20231.7M+1.3%907K1.91
    13 October 20231.7M+7.1%655K2.60
    29 September 20231.6M-2.5%554K2.88
    15 September 20231.6M+2.1%729K2.24
    31 August 20231.6M-11.4%651K2.46
    15 August 20231.8M+0.0%833K2.17
    31 July 20231.8M-1.5%1.0M1.80
    14 July 20231.8M-4.1%558K3.29
    30 June 20231.9M-8.0%1.1M1.75
    15 June 20232.1M-0.3%684K3.04
    31 May 20232.1M+19.9%826K2.53
    15 May 20231.7M-20.3%752K2.31
    28 April 20232.2M+8.7%1.1M2.06
    14 April 20232.0M+0.4%679K2.96
    31 March 20232.0M+14.2%1.1M1.89
    15 March 20231.8M+9.6%891K1.97
    28 February 20231.6M+1.4%693K2.31
    15 February 20231.6M-5.7%882K1.79
    31 January 20231.7M+37.0%814K2.05
    13 January 20231.2M-2.7%620K1.97
    30 December 20221.3M-12.6%674K1.86
    15 December 20221.4M-19.3%923K1.55
    30 November 20221.8M+8.5%734K2.42
    15 November 20221.6M-0.7%691K2.37
    31 October 20221.6M-9.1%1.0M1.62
    14 October 20221.8M-8.4%724K2.51
    30 September 20222.0M-5.8%902K2.20
    15 September 20222.1M+1.4%731K2.88
    31 August 20222.1M+4.8%690K3.01
    15 August 20222.0M+6.0%795K2.49
    29 July 20221.9M+4.9%871K2.15
    15 July 20221.8M-9.5%909K1.96
    30 June 20222.0M-0.5%1.0M1.89
    15 June 20222.0M-17.9%824K2.40
    31 May 20222.4M-8.9%1.2M2.02
    13 May 20222.6M+2.7%1.0M2.60
    29 April 20222.6M-11.0%1.1M2.38
    14 April 20222.9M-9.2%802K3.60
    31 March 20223.2M-16.8%1.4M2.27
    15 March 20223.8M+11.4%1.6M2.39
    28 February 20223.4M-2.0%1.2M2.76
    15 February 20223.5M+14.7%1.2M2.81
    31 January 20223.1M-13.4%1.3M2.28
    14 January 20223.5M-8.3%1.3M2.81
    31 December 20213.8M-23.1%1.1M3.43
    15 December 20215.0M-9.1%1.2M4.15
    30 November 20215.5M-2.0%1.6M3.42
    15 November 20215.6M-9.2%1.4M3.93
    29 October 20216.2M-11.9%1.2M5.10
    15 October 20217.0M-12.2%1.1M6.48
    30 September 20218.0M-18.3%1.2M6.57
    15 September 20219.8M-12.5%1.3M7.53
    31 August 202111.2M-21.1%1.5M7.34
    13 August 202114.2M-27.9%2.0M6.95
    30 July 202119.6M-24.0%4.1M4.83
    15 July 202125.8M+0.0%1.3M20.66
    30 June 202125.8M-7.5%2.8M9.23
    15 June 202127.9M-0.1%1.5M19.15
    28 May 202128.0M+3.8%1.3M20.74
    14 May 202126.9M+4.1%1.4M19.22
    30 April 202125.9M+8.3%1.5M17.02
    15 April 202123.9M+4.3%1.2M19.85
    31 March 202122.9M-7.3%1.9M12.14
    15 March 202124.7M-0.4%1.4M18.10
    26 February 202124.8M+1.1%1.8M14.15
    12 February 202124.5M+4.0%1.6M15.26
    29 January 202123.6M+4.4%1.3M17.83
    15 January 202122.6M+5.1%1.4M15.79
    31 December 202021.5M+1.4%1.4M14.96
    15 December 202021.2M+4.2%1.4M15.26
    30 November 202020.3M+7.6%1.3M15.78
    13 November 202018.9M+0.8%1.9M9.71
    30 October 202018.7M+1.0%1.1M16.72
    15 October 202018.6M+4.0%1.0M17.86
    30 September 202017.8M-1.9%1.4M12.40
    15 September 202018.2M+8.0%1.3M13.94
    31 August 202016.8M+5.7%1.3M12.78
    14 August 202015.9M+6.2%1.6M9.84
    31 July 202015.0M+10.8%1.2M12.87
    15 July 202013.6M+1.4%1.2M11.63
    30 June 202013.4M+8.7%1.6M8.33
    15 June 202012.3M+10.2%1.2M10.04
    29 May 202011.2M+0.7%1.1M10.47
    15 May 202011.1M+5.6%1.4M8.10
    30 April 202010.5M+17.2%1.2M8.66
    15 April 20209.0M+12.7%1.4M6.21
    31 March 20207.9M+98.7%2.5M3.16
    13 March 20204.0M+171.0%2.7M1.46
    28 February 20201.5M-3.9%1.3M1.14
    14 February 20201.5M+6.7%841K1.83
    31 January 20201.4M+0.4%748K1.92
    15 January 20201.4M+0.9%539K2.66
    31 December 20191.4M-15.6%876K1.62
    13 December 20191.7M+8.3%584K2.88
    29 November 20191.6M+0.8%873K1.78
    15 November 20191.5M+4.9%904K1.71
    31 October 20191.5M-18.1%960K1.53
    15 October 20191.8M+2.7%563K3.19
    30 September 20191.7M+6.4%777K2.25
    13 September 20191.6M-11.5%824K1.99
    30 August 20191.9M+14.8%633K2.93
    15 August 20191.6M+4.0%890K1.82
    31 July 20191.6M-9.3%776K2.00
    15 July 20191.7M-16.4%593K2.89
    28 June 20192.0M+16.1%838K2.44
    14 June 20191.8M+3.9%895K1.97
    31 May 20191.7M-2.2%1.1M1.57
    15 May 20191.7M+7.0%762K2.28
    30 April 20191.6M+0.8%868K1.87
    15 April 20191.6M-12.3%720K2.24
    29 March 20191.8M+18.8%827K2.22
    15 March 20191.5M-0.1%1.8M1.00
    28 February 20191.5M-24.0%982K1.58
    15 February 20192.0M+24.2%1.3M1.52
    31 January 20191.6M-0.4%1.1M1.55
    15 January 20191.6M-11.0%1.1M1.49
    31 December 20181.8M-22.7%1.2M1.51
    14 December 20182.4M+10.0%934K2.56
    30 November 20182.2M-1.2%1.0M2.12
    15 November 20182.2M-7.7%938K2.35
    31 October 20182.4M-3.2%1.2M1.97
    15 October 20182.5M+8.1%901K2.73
    28 September 20182.3M-0.3%1.1M2.13
    14 September 20182.3M+6.6%790K2.89
    31 August 20182.1M+10.0%745K2.88
    15 August 20181.9M-3.1%686K2.84
    31 July 20182.0M+7.8%853K2.36
    13 July 20181.9M+2.0%719K2.59
    29 June 20181.8M-13.4%969K1.89
    15 June 20182.1M-10.6%884K2.39
    31 May 20182.4M-5.2%879K2.69
    15 May 20182.5M-9.0%874K2.85
    30 April 20182.7M+4.5%869K3.16
    13 April 20182.6M-0.7%800K3.28
    29 March 20182.6M-21.9%1.2M2.20
    15 March 20183.4M-9.6%1.1M3.09
    28 February 20183.7M-13.9%1.3M2.99
    15 February 20184.3M+0.7%2.0M2.23
    31 January 20184.3M+8.0%1.2M3.46
    12 January 20184.0M+5.1%1.1M3.71
    29 December 20173.8M961K3.96
    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.