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Quest Diagnostics Inc. short interest

3.6M shares of Quest Diagnostics were sold short at the 15 October 2026 settlement, near the bottom of its range over the last year (3.3M to 5.8M). Short sellers would need 3.4 days of normal trading to buy them back.

Shares sold short3.6Mat 15 Oct 2026
Change on the settlement before+4.6%-10% over a year
Days to cover3.38at 1.1M shares a day
Of shares in issue3.25%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 (3.3M to 5.8M), and the share price moved +36% 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 20263.6M+4.6%1.1M3.38
    30 September 20263.4M-5.1%1.3M2.69
    15 September 20263.6M+4.5%976K3.69
    31 August 20263.4M+3.7%894K3.86
    14 August 20263.3M-9.8%712K4.67
    31 July 20263.7M+5.0%1.3M2.74
    15 July 20263.5M-6.0%824K4.26
    30 June 20263.7M+9.1%971K3.84
    15 June 20263.4M-0.3%803K4.26
    29 May 20263.4M-7.6%822K4.17
    15 May 20263.7M+9.6%745K4.99
    30 April 20263.4M-4.6%1.3M2.59
    15 April 20263.6M-14.9%772K4.60
    31 March 20264.2M+7.8%937K4.46
    13 March 20263.9M-0.0%745K5.20
    27 February 20263.9M-18.8%845K4.58
    13 February 20264.8M-18.1%1.5M3.27
    30 January 20265.8M+1.8%1.0M5.63
    15 January 20265.7M-2.2%969K5.90
    31 December 20255.8M+38.4%874K6.69
    15 December 20254.2M-1.7%988K4.28
    28 November 20254.3M+0.1%1.2M3.54
    14 November 20254.3M-6.9%1.1M3.87
    31 October 20254.6M+16.8%1.3M3.49
    15 October 20253.9M-8.8%980K4.03
    30 September 20254.3M-2.1%757K5.72
    15 September 20254.4M+4.1%616K7.18
    29 August 20254.2M+5.4%826K5.14
    15 August 20254.0M-14.9%845K4.77
    31 July 20254.7M+3.5%1.6M2.88
    15 July 20254.6M-8.1%968K4.73
    30 June 20255.0M+36.8%923K5.40
    13 June 20253.6M-4.8%704K5.17
    30 May 20253.8M-1.9%1.2M3.11
    15 May 20253.9M-2.9%1.2M3.35
    30 April 20254.0M+14.7%1.5M2.66
    15 April 20253.5M+22.4%1.8M1.93
    31 March 20252.9M+3.5%1.1M2.58
    14 March 20252.8M+7.7%1.3M2.06
    28 February 20252.6M-13.2%1.1M2.23
    14 February 20253.0M+14.5%981K3.01
    31 January 20252.6M+13.7%1.3M1.95
    15 January 20252.3M+11.7%717K3.17
    31 December 20242.0M+6.4%723K2.81
    13 December 20241.9M-6.3%821K2.33
    29 November 20242.0M-21.3%781K2.61
    15 November 20242.6M+8.7%980K2.64
    31 October 20242.4M+2.4%955K2.50
    15 October 20242.3M+18.0%592K3.93
    30 September 20242.0M-18.5%724K2.72
    13 September 20242.4M-5.3%755K3.20
    30 August 20242.6M-8.5%590K4.33
    15 August 20242.8M+19.5%856K3.26
    31 July 20242.3M+2.2%1.2M2.02
    15 July 20242.3M+0.6%877K2.60
    28 June 20242.3M-3.9%834K2.72
    14 June 20242.4M-11.0%663K3.57
    31 May 20242.7M-1.7%1.1M2.52
    15 May 20242.7M-3.7%708K3.81
    30 April 20242.8M-7.3%1.3M2.08
    15 April 20243.0M+18.8%952K3.18
    28 March 20242.5M-3.9%730K3.49
    15 March 20242.6M-3.7%1.0M2.60
    29 February 20242.8M-7.3%1.0M2.62
    15 February 20243.0M-13.8%1.3M2.37
    31 January 20243.4M+13.3%1.1M3.04
    12 January 20243.0M+21.9%1.1M2.81
    29 December 20232.5M-2.3%594K4.20
    15 December 20232.6M+12.4%1.1M2.36
    30 November 20232.3M-15.7%847K2.68
    15 November 20232.7M+7.2%891K3.02
    31 October 20232.5M-15.4%1.3M1.97
    13 October 20233.0M+2.0%794K3.74
    29 September 20232.9M+3.8%802K3.63
    15 September 20232.8M-4.6%752K3.73
    31 August 20232.9M-9.6%727K4.04
    15 August 20233.2M+0.6%666K4.88
    31 July 20233.2M+6.5%965K3.35
    14 July 20233.0M-10.0%700K4.33
    30 June 20233.4M-10.3%1.1M3.16
    15 June 20233.8M-7.1%858K4.38
    31 May 20234.0M-0.8%978K4.14
    15 May 20234.1M-4.1%899K4.54
    28 April 20234.3M+3.2%1.3M3.33
    14 April 20234.1M+15.1%876K4.70
    31 March 20233.6M+19.3%1.3M2.71
    15 March 20233.0M-9.7%1.3M2.28
    28 February 20233.3M+8.8%1.0M3.22
    15 February 20233.1M+11.4%1.3M2.31
    31 January 20232.7M-16.9%926K2.96
    13 January 20233.3M-12.5%1.2M2.84
    30 December 20223.8M-5.8%1.1M3.49
    15 December 20224.0M-12.3%1.0M3.92
    30 November 20224.6M-13.8%1.1M4.19
    15 November 20225.3M+5.5%1.2M4.36
    31 October 20225.0M+2.6%1.4M3.58
    14 October 20224.9M-6.4%799K6.11
    30 September 20225.2M-5.7%1.0M5.08
    15 September 20225.5M+2.5%841K6.58
    31 August 20225.4M+10.4%874K6.17
    15 August 20224.9M+2.1%685K7.14
    29 July 20224.8M+2.9%955K5.01
    15 July 20224.7M+0.9%724K6.43
    30 June 20224.6M-5.5%934K4.94
    15 June 20224.9M-0.2%757K6.45
    31 May 20224.9M+3.3%1.3M3.70
    13 May 20224.7M-2.2%843K5.62
    29 April 20224.8M-8.4%1.2M3.94
    14 April 20225.3M-3.4%1.1M4.67
    31 March 20225.5M-6.2%1.3M4.28
    15 March 20225.8M+0.6%1.1M5.23
    28 February 20225.8M+16.4%1.4M4.10
    15 February 20225.0M+27.5%1.4M3.52
    31 January 20223.9M+20.2%1.4M2.87
    14 January 20223.3M+13.4%1.3M2.49
    31 December 20212.9M-18.4%982K2.92
    15 December 20213.5M-27.1%1.2M2.92
    30 November 20214.8M+4.5%1.3M3.78
    15 November 20214.6M+12.0%1.3M3.67
    29 October 20214.1M-4.2%1.3M3.23
    15 October 20214.3M-3.1%1.5M2.81
    30 September 20214.4M-10.9%1.4M3.22
    15 September 20215.0M-16.2%1.2M4.17
    31 August 20215.9M-6.6%1.0M5.79
    13 August 20216.4M-11.7%1.1M5.69
    30 July 20217.2M-11.3%1.2M6.14
    15 July 20218.1M-6.7%852K9.54
    30 June 20218.7M-6.6%1.1M8.12
    15 June 20219.3M-5.1%1.1M8.83
    28 May 20219.8M-5.3%1.2M8.24
    14 May 202110.4M-3.5%1.2M8.96
    30 April 202110.7M+197.4%1.1M9.34
    15 April 20213.6M-6.1%904K3.99
    31 March 20213.8M+0.2%1.0M3.78
    15 March 20213.8M+14.4%1.3M2.95
    26 February 20213.4M+33.6%1.3M2.65
    12 February 20212.5M-6.1%1.4M1.82
    29 January 20212.7M-4.1%1.1M2.48
    15 January 20212.8M-1.2%1.3M2.09
    31 December 20202.8M+10.9%1.1M2.61
    15 December 20202.5M+8.0%981K2.60
    30 November 20202.4M-4.8%953K2.48
    13 November 20202.5M+23.1%1.1M2.26
    30 October 20202.0M-0.3%1.3M1.56
    15 October 20202.0M+1.1%669K3.02
    30 September 20202.0M-27.1%1.0M1.91
    15 September 20202.7M-4.8%1.6M1.66
    31 August 20202.9M+0.1%1.5M1.93
    14 August 20202.9M+3.9%951K3.02
    31 July 20202.8M-13.3%1.3M2.13
    15 July 20203.2M-6.1%1.2M2.61
    30 June 20203.4M+3.4%1.3M2.55
    15 June 20203.3M-16.1%1.4M2.28
    29 May 20203.9M-15.8%1.2M3.20
    15 May 20204.7M-16.7%1.4M3.42
    30 April 20205.6M-2.9%2.8M2.02
    15 April 20205.8M-3.8%1.7M3.41
    31 March 20206.0M+7.2%2.4M2.44
    13 March 20205.6M+57.2%2.5M2.24
    28 February 20203.5M-4.4%1.2M2.90
    14 February 20203.7M-1.3%787K4.71
    31 January 20203.8M-2.5%942K3.99
    15 January 20203.9M-2.8%606K6.36
    31 December 20194.0M+14.4%689K5.76
    13 December 20193.5M-3.5%664K5.23
    29 November 20193.6M-5.8%844K4.26
    15 November 20193.8M+0.7%783K4.87
    31 October 20193.8M+6.0%1.2M3.26
    15 October 20193.6M-9.3%765K4.68
    30 September 20193.9M+9.2%746K5.28
    13 September 20193.6M-7.9%1.0M3.54
    30 August 20193.9M+0.6%997K3.93
    15 August 20193.9M-2.4%804K4.84
    31 July 20194.0M-11.9%1.2M3.23
    15 July 20194.5M-0.1%664K6.82
    28 June 20194.5M+5.8%818K5.54
    14 June 20194.3M-5.6%821K5.21
    31 May 20194.5M-9.0%1.1M4.25
    15 May 20195.0M-1.5%1.1M4.73
    30 April 20195.1M+0.6%1.7M2.96
    15 April 20195.0M-0.4%934K5.38
    29 March 20195.0M+19.8%1.1M4.53
    15 March 20194.2M+12.8%1.5M2.83
    28 February 20193.7M-5.1%1.5M2.49
    15 February 20193.9M-7.3%1.5M2.64
    31 January 20194.2M+13.9%1.1M3.79
    15 January 20193.7M+0.9%1.3M2.87
    31 December 20183.7M+8.8%1.3M2.78
    14 December 20183.4M+24.4%1.7M2.04
    30 November 20182.7M-6.6%1.4M1.90
    15 November 20182.9M-8.1%977K2.99
    31 October 20183.2M+10.2%1.7M1.85
    15 October 20182.9M+27.7%1.1M2.69
    28 September 20182.3M-5.6%1.0M2.25
    14 September 20182.4M-18.2%830K2.88
    31 August 20182.9M-28.3%759K3.86
    15 August 20184.1M-8.8%630K6.47
    31 July 20184.5M+9.9%1.1M4.10
    13 July 20184.1M-1.7%737K5.53
    29 June 20184.1M-10.3%1.0M4.09
    15 June 20184.6M+10.1%854K5.41
    31 May 20184.2M+0.7%1.2M3.53
    15 May 20184.2M+4.7%758K5.49
    30 April 20184.0M-13.0%1.3M3.17
    13 April 20184.6M-10.4%988K4.63
    29 March 20185.1M-5.1%872K5.85
    15 March 20185.4M-8.6%904K5.95
    28 February 20185.9M+4.4%1.1M5.38
    15 February 20185.6M-4.2%1.4M3.91
    31 January 20185.9M+1.0%875K6.72
    12 January 20185.8M+10.8%861K6.77
    29 December 20175.3M765K6.87
    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.