greeksoup/ stock research
Stock research / United States / MLM / Short interest

Martin Marietta Materials Inc. short interest

3.2M shares of Martin Marietta Materials were sold short at the 15 October 2026 settlement, the most since 31 May 2019. Short sellers would need 4.6 days of normal trading to buy them back.

Shares sold short3.2Mat 15 Oct 2026
Change on the settlement before+0.7%+80% over a year
Days to cover4.56at 703K shares a day
Of shares in issue4.51%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 31 May 2019, and the share price moved -19% 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 20263.2M+0.7%703K4.56
    30 September 20263.2M+9.7%966K3.30
    15 September 20262.9M+7.4%839K3.46
    31 August 20262.7M+19.6%620K4.36
    14 August 20262.3M-5.0%480K4.71
    31 July 20262.4M-2.7%649K3.67
    15 July 20262.4M+9.7%579K4.22
    30 June 20262.2M+3.2%738K3.02
    15 June 20262.2M-2.5%506K4.27
    29 May 20262.2M+33.1%659K3.36
    15 May 20261.7M+15.6%479K3.47
    30 April 20261.4M-14.2%521K2.76
    15 April 20261.7M-11.3%338K4.96
    31 March 20261.9M+9.7%562K3.37
    13 March 20261.7M-3.6%655K2.63
    27 February 20261.8M+9.6%598K2.99
    13 February 20261.6M-22.8%595K2.74
    30 January 20262.1M+5.6%360K5.88
    15 January 20262.0M+0.6%467K4.29
    31 December 20252.0M+14.2%415K4.80
    15 December 20251.7M+7.2%363K4.80
    28 November 20251.6M+1.8%442K3.68
    14 November 20251.6M-0.1%472K3.38
    31 October 20251.6M-10.2%306K5.22
    15 October 20251.8M+7.2%327K5.44
    30 September 20251.7M+0.4%363K4.58
    15 September 20251.7M-1.9%365K4.53
    29 August 20251.7M-14.7%391K4.31
    15 August 20252.0M-8.9%500K3.95
    31 July 20252.2M-0.4%355K6.10
    15 July 20252.2M+9.0%338K6.44
    30 June 20252.0M-10.1%473K4.22
    13 June 20252.2M-4.4%332K6.68
    30 May 20252.3M+11.5%500K4.65
    15 May 20252.1M+1.7%389K5.36
    30 April 20252.0M-6.6%448K4.58
    15 April 20252.2M+18.1%593K3.70
    31 March 20251.9M+5.4%518K3.58
    14 March 20251.8M+7.3%896K1.97
    28 February 20251.6M+20.0%648K2.54
    14 February 20251.4M+4.0%574K2.39
    31 January 20251.3M-3.3%338K3.89
    15 January 20251.4M-5.5%379K3.59
    31 December 20241.4M+1.7%432K3.34
    13 December 20241.4M-8.9%387K3.67
    29 November 20241.6M+6.1%417K3.73
    15 November 20241.5M-6.0%504K2.91
    31 October 20241.6M-6.6%456K3.43
    15 October 20241.7M-0.2%371K4.51
    30 September 20241.7M+20.1%474K3.54
    13 September 20241.4M+1.8%461K3.02
    30 August 20241.4M+32.9%456K3.00
    15 August 20241.0M-9.5%542K1.90
    31 July 20241.1M-11.5%523K2.18
    15 July 20241.3M+1.5%530K2.43
    28 June 20241.3M+13.7%539K2.35
    14 June 20241.1M-2.0%400K2.79
    31 May 20241.1M+25.6%436K2.61
    15 May 2024906K-5.9%394K2.30
    30 April 2024963K-2.5%505K1.91
    15 April 2024987K+13.7%375K2.63
    28 March 2024869K-6.8%375K2.32
    15 March 2024932K+68.5%628K1.48
    29 February 2024553K+3.3%435K1.27
    15 February 2024536K+4.1%449K1.19
    31 January 2024515K-24.2%247K2.08
    12 January 2024679K-6.5%286K2.37
    29 December 2023726K-6.8%208K3.48
    15 December 2023779K+14.8%384K2.03
    30 November 2023678K-1.0%325K2.09
    15 November 2023685K+1.5%389K1.76
    31 October 2023675K-2.1%360K1.87
    13 October 2023689K-7.8%410K1.68
    29 September 2023748K+37.7%450K1.66
    15 September 2023543K-23.4%395K1.37
    31 August 2023709K+27.5%324K2.19
    15 August 2023556K-0.3%426K1.31
    31 July 2023558K-11.4%404K1.38
    14 July 2023630K+1.8%432K1.46
    30 June 2023619K-15.6%407K1.52
    15 June 2023734K-1.5%378K1.94
    31 May 2023745K+22.0%320K2.33
    15 May 2023611K-24.0%427K1.43
    28 April 2023804K-10.0%259K3.10
    14 April 2023893K-3.6%332K2.69
    31 March 2023927K+20.3%422K2.20
    15 March 2023770K-11.3%376K2.05
    28 February 2023868K-23.4%446K1.95
    15 February 20231.1M-18.9%400K2.83
    31 January 20231.4M-3.5%321K4.35
    13 January 20231.4M+3.6%358K4.04
    30 December 20221.4M+5.4%315K4.43
    15 December 20221.3M+7.4%400K3.31
    30 November 20221.2M-6.1%293K4.20
    15 November 20221.3M+2.9%444K2.96
    31 October 20221.3M-11.7%368K3.47
    14 October 20221.4M-0.3%369K3.91
    30 September 20221.5M+8.6%484K3.00
    15 September 20221.3M+21.4%363K3.68
    31 August 20221.1M-6.6%354K3.11
    15 August 20221.2M-11.4%418K2.82
    29 July 20221.3M-21.0%400K3.32
    15 July 20221.7M+27.5%453K3.71
    30 June 20221.3M+10.2%492K2.68
    15 June 20221.2M-24.3%415K2.89
    31 May 20221.6M+2.8%563K2.81
    13 May 20221.5M+30.9%573K2.68
    29 April 20221.2M+9.8%385K3.06
    14 April 20221.1M-14.5%350K3.06
    31 March 20221.3M+28.8%405K3.09
    15 March 2022972K-11.0%407K2.39
    28 February 20221.1M+46.5%546K2.00
    15 February 2022746K+7.9%564K1.32
    31 January 2022692K+29.2%682K1.01
    14 January 2022535K-19.7%395K1.35
    31 December 2021666K-5.3%285K2.34
    15 December 2021704K-0.5%326K2.16
    30 November 2021707K+21.9%247K2.86
    15 November 2021580K-4.0%406K1.43
    29 October 2021604K+8.0%278K2.17
    15 October 2021560K+4.2%320K1.75
    30 September 2021537K+8.1%456K1.18
    15 September 2021497K-32.3%253K1.96
    31 August 2021734K+15.5%218K3.37
    13 August 2021635K+15.6%310K2.05
    30 July 2021550K-8.7%360K1.53
    15 July 2021602K-6.3%322K1.87
    30 June 2021642K+20.1%412K1.56
    15 June 2021534K+3.4%402K1.33
    28 May 2021517K-1.3%388K1.33
    14 May 2021524K+30.3%314K1.67
    30 April 2021402K-10.9%265K1.52
    15 April 2021451K-21.0%400K1.13
    31 March 2021571K-8.7%505K1.13
    15 March 2021626K-33.3%454K1.38
    26 February 2021938K+22.4%414K2.27
    12 February 2021767K+4.5%426K1.80
    29 January 2021734K-1.2%577K1.27
    15 January 2021743K-31.2%726K1.02
    31 December 20201.1M-15.9%416K2.60
    15 December 20201.3M-11.2%472K2.72
    30 November 20201.4M+0.8%309K4.68
    13 November 20201.4M-19.9%682K2.10
    30 October 20201.8M-25.1%430K4.16
    15 October 20202.4M-23.5%805K2.97
    30 September 20203.1M+17.4%622K5.03
    15 September 20202.7M+18.9%584K4.56
    31 August 20202.2M+3.1%418K5.36
    14 August 20202.2M-0.3%443K4.91
    31 July 20202.2M-13.2%580K3.76
    15 July 20202.5M-2.5%490K5.12
    30 June 20202.6M+15.6%589K4.38
    15 June 20202.2M-7.7%666K3.35
    29 May 20202.4M+12.2%567K4.26
    15 May 20202.2M+7.0%695K3.10
    30 April 20202.0M-0.6%654K3.08
    15 April 20202.0M+2.1%904K2.24
    31 March 20202.0M+91.1%1.0M1.91
    13 March 20201.0M+10.3%753K1.38
    28 February 2020940K-1.7%811K1.16
    14 February 2020957K-14.9%539K1.77
    31 January 20201.1M-12.3%471K2.39
    15 January 20201.3M-4.0%515K2.49
    31 December 20191.3M-2.7%434K3.07
    13 December 20191.4M-19.9%441K3.11
    29 November 20191.7M+11.7%565K3.03
    15 November 20191.5M+26.9%763K2.01
    31 October 20191.2M+0.7%603K2.00
    15 October 20191.2M-16.3%574K2.09
    30 September 20191.4M+12.4%444K3.23
    13 September 20191.3M-3.4%515K2.48
    30 August 20191.3M-22.9%515K2.57
    15 August 20191.7M-11.0%569K3.01
    31 July 20191.9M-15.3%788K2.44
    15 July 20192.3M-14.3%405K5.61
    28 June 20192.7M-9.4%506K5.24
    14 June 20192.9M-13.8%632K4.63
    31 May 20193.4M+18.7%512K6.63
    15 May 20192.9M-5.8%616K4.64
    30 April 20193.0M-10.1%614K4.95
    15 April 20193.4M+2.0%543K6.22
    29 March 20193.3M+4.0%584K5.67
    15 March 20193.2M-2.2%633K5.03
    28 February 20193.3M+2.2%612K5.32
    15 February 20193.2M-16.8%1.1M2.83
    31 January 20193.8M+2.0%756K5.07
    15 January 20193.8M-8.4%628K5.98
    31 December 20184.1M-2.0%830K4.95
    14 December 20184.2M-31.6%952K4.40
    30 November 20186.1M+39.7%786K7.79
    15 November 20184.4M+14.1%1.2M3.57
    31 October 20183.8M+6.3%1.7M2.33
    15 October 20183.6M+12.3%838K4.31
    28 September 20183.2M-8.3%699K4.60
    14 September 20183.5M-1.7%644K5.44
    31 August 20183.6M+5.0%530K6.73
    15 August 20183.4M+15.6%760K4.47
    31 July 20182.9M+5.9%875K3.36
    13 July 20182.8M-2.2%374K7.42
    29 June 20182.8M-5.1%500K5.68
    15 June 20183.0M-14.0%621K4.81
    31 May 20183.5M+19.8%550K6.32
    15 May 20182.9M+1.2%805K3.60
    30 April 20182.9M+0.5%540K5.31
    13 April 20182.9M+12.4%565K5.05
    29 March 20182.5M+7.3%656K3.87
    15 March 20182.4M-3.4%547K4.33
    28 February 20182.5M+7.7%631K3.88
    15 February 20182.3M-4.7%1.1M2.00
    31 January 20182.4M-14.2%581K4.11
    12 January 20182.8M+24.8%651K4.27
    29 December 20172.2M591K3.77
    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.