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Martin Marietta Materials Inc

MLM
Exchange
NYSE
Industry
Mining & Quarrying of Nonmetallic Minerals (No Fuels)
SEC CIK
0000916076

No open-market purchases or sales by Martin Marietta Materials Inc insiders were filed in the last 90 days; 1,082 institutions reported holding it in 13F filings for Q2 2026, worth $34.2B in total; 4 superinvestors hold it, including TCI Fund Management and Gardner Russo & Quinn.

Four kinds of short-selling data, each measuring something different:

  • Short interest: shares sold short and not yet bought back, as of a settlement date. FINRA publishes it twice a month, about eight business days after the settlement date.
  • Daily short volume: shares sold short each day in off-exchange trades reported to FINRA. It counts trades, not open positions, and is published the next day.
  • Fails-to-deliver: shares not delivered by the settlement date. The SEC publishes them twice a month, about two weeks late.
  • ATS (dark pool) volume: weekly volume on alternative trading systems and other off-exchange venues. FINRA publishes it two to four weeks after the week.

More in the glossary.

Short interest

Shares sold short and not yet bought back, from FINRA, on every settlement date in the last two years.

Short interest
3.37M
Shares, settlement Oct 30, 2026
Change
+159.1K
+5.0% vs. Oct 15, 2026
Days to cover
3.66
Short interest ÷ average daily volume
Average daily volume
921.1K
Shares, as reported by FINRA
Short interest by settlement date
Oct 31, 2024: 1,560,914 sharesNov 15, 2024: 1,466,524 sharesNov 29, 2024: 1,555,320 sharesDec 13, 2024: 1,417,394 sharesDec 31, 2024: 1,441,026 sharesJan 15, 2025: 1,361,592 sharesJan 31, 2025: 1,316,280 sharesFeb 14, 2025: 1,369,457 sharesFeb 28, 2025: 1,643,878 sharesMar 14, 2025: 1,763,111 sharesMar 31, 2025: 1,857,745 sharesApr 15, 2025: 2,193,755 sharesApr 30, 2025: 2,048,069 sharesMay 15, 2025: 2,082,292 sharesMay 30, 2025: 2,322,430 sharesJun 13, 2025: 2,220,490 sharesJun 30, 2025: 1,996,318 sharesJul 15, 2025: 2,176,304 sharesJul 31, 2025: 2,168,389 sharesAug 15, 2025: 1,975,623 sharesAug 29, 2025: 1,685,207 sharesSep 15, 2025: 1,652,791 sharesSep 30, 2025: 1,660,226 sharesOct 15, 2025: 1,779,938 sharesOct 31, 2025: 1,597,944 sharesNov 14, 2025: 1,596,544 sharesNov 28, 2025: 1,625,834 sharesDec 15, 2025: 1,742,510 sharesDec 31, 2025: 1,989,623 sharesJan 15, 2026: 2,002,181 sharesJan 30, 2026: 2,114,191 sharesFeb 13, 2026: 1,632,050 sharesFeb 27, 2026: 1,788,257 sharesMar 13, 2026: 1,723,193 sharesMar 31, 2026: 1,890,998 sharesApr 15, 2026: 1,677,013 sharesApr 30, 2026: 1,439,413 sharesMay 15, 2026: 1,664,180 sharesMay 29, 2026: 2,215,305 sharesJun 15, 2026: 2,160,946 sharesJun 30, 2026: 2,229,187 sharesJul 15, 2026: 2,445,770 sharesJul 31, 2026: 2,380,633 sharesAug 14, 2026: 2,262,403 sharesAug 31, 2026: 2,706,782 sharesSep 15, 2026: 2,906,618 sharesSep 30, 2026: 3,187,868 sharesOct 15, 2026: 3,210,245 sharesOct 30, 2026: 3,369,330 shares
Short interest in MLM by settlement date
Settlement dateShort interestChangeChange %Avg. daily volumeDays to cover
Oct 30, 20263.37M+159.1K+5.0%921.1K3.66
Oct 15, 20263.21M+22.4K+0.7%703.2K4.56
Sep 30, 20263.19M+281.3K+9.7%966.2K3.30
Sep 15, 20262.91M+199.8K+7.4%838.9K3.46
Aug 31, 20262.71M+444.4K+19.6%620.3K4.36
Aug 14, 20262.26M−118.2K−5.0%480.1K4.71
Jul 31, 20262.38M−65.1K−2.7%648.6K3.67
Jul 15, 20262.45M+216.6K+9.7%579.0K4.22
Jun 30, 20262.23M+68.2K+3.2%738.5K3.02
Jun 15, 20262.16M−54.4K−2.5%505.9K4.27
May 29, 20262.22M+551.1K+33.1%659.3K3.36
May 15, 20261.66M+224.8K+15.6%479.1K3.47
Apr 30, 20261.44M−237.6K−14.2%520.6K2.76
Apr 15, 20261.68M−214.0K−11.3%337.9K4.96
Mar 31, 20261.89M+167.8K+9.7%561.7K3.37
Mar 13, 20261.72M−65.1K−3.6%655.0K2.63
Feb 27, 20261.79M+156.2K+9.6%597.9K2.99
Feb 13, 20261.63M−482.1K−22.8%595.3K2.74
Jan 30, 20262.11M+112.0K+5.6%359.8K5.88
Jan 15, 20262.00M+12.6K+0.6%467.1K4.29
Dec 31, 20251.99M+247.1K+14.2%414.8K4.80
Dec 15, 20251.74M+116.7K+7.2%363.1K4.80
Nov 28, 20251.63M+29.3K+1.8%442.0K3.68
Nov 14, 20251.60M−1.40K−0.1%472.2K3.38
Oct 31, 20251.60M−182.0K−10.2%306.3K5.22
Oct 15, 20251.78M+119.7K+7.2%327.2K5.44
Sep 30, 20251.66M+7.43K+0.5%362.5K4.58
Sep 15, 20251.65M−32.4K−1.9%364.7K4.53
Aug 29, 20251.69M−290.4K−14.7%390.6K4.31
Aug 15, 20251.98M−192.8K−8.9%499.8K3.95
Jul 31, 20252.17M−7.92K−0.4%355.4K6.10
Jul 15, 20252.18M+180.0K+9.0%337.7K6.44
Jun 30, 20252.00M−224.2K−10.1%472.8K4.22
Jun 13, 20252.22M−101.9K−4.4%332.3K6.68
May 30, 20252.32M+240.1K+11.5%499.9K4.65
May 15, 20252.08M+34.2K+1.7%388.8K5.36
Apr 30, 20252.05M−145.7K−6.6%447.5K4.58
Apr 15, 20252.19M+336.0K+18.1%592.8K3.70
Mar 31, 20251.86M+94.6K+5.4%518.4K3.58
Mar 14, 20251.76M+119.2K+7.3%895.8K1.97
Feb 28, 20251.64M+274.4K+20.0%648.1K2.54
Feb 14, 20251.37M+53.2K+4.0%573.6K2.39
Jan 31, 20251.32M−45.3K−3.3%338.5K3.89
Jan 15, 20251.36M−79.4K−5.5%378.8K3.59
Dec 31, 20241.44M+23.6K+1.7%431.7K3.34
Dec 13, 20241.42M−137.9K−8.9%386.7K3.67
Nov 29, 20241.56M+88.8K+6.1%417.1K3.73
Nov 15, 20241.47M−94.4K−6.1%504.1K2.91
Oct 31, 20241.56M−110.9K−6.6%455.7K3.43

Fails-to-deliver

Shares that weren't delivered by the settlement date, from the SEC, for the last 30 dates with fails. The price is the previous day's closing price published by the SEC.

Fails-to-deliver in MLM by settlement date
Settlement dateSharesPriceValue
Oct 13, 20262$477.18$954.36
Oct 9, 202685$481.57$40.9K
Oct 8, 202610$479.01$4.79K
Oct 7, 20262$489.01$978.02
Oct 6, 20264$485.50$1.94K
Sep 29, 202611,539$490.77$5.66M
Sep 25, 202612$480.10$5.76K
Sep 8, 20268$514.77$4.12K
Sep 4, 202624$508.94$12.2K
Sep 2, 202610$504.92$5.05K
Aug 27, 20262,877$532.18$1.53M
Aug 21, 202631$525.27$16.3K
Aug 20, 20262,253$535.53$1.21M
Aug 19, 2026310$522.81$162.1K
Aug 5, 20265,042$555.82$2.80M
Aug 3, 2026877$525.14$460.5K
Jul 23, 20264,132$550.66$2.28M
Jul 22, 2026166$547.33$90.9K
Jul 21, 2026263$553.62$145.6K
Jul 16, 20261,604$569.32$913.2K
Jul 14, 20261,232$569.35$701.4K
Jul 2, 2026151$579.24$87.5K
Jul 1, 2026158$576.70$91.1K
Jun 30, 202613,092$581.23$7.61M
Jun 22, 20261,492$609.12$908.8K
Jun 10, 2026131$572.25$75.0K
May 29, 202627$575.14$15.5K
May 26, 2026603$536.48$323.5K
May 14, 20261$576.79$576.79
May 5, 2026187$603.29$112.8K

Daily short volume

Off-exchange short-sale volume, not short interest: shares sold short each day in trades reported to FINRA, for the last 30 trading days.

The short volume ratio isn't a sentiment gauge: market makers sell short to fill buy orders and to hedge, so short sales are usually about half of off-exchange volume.

Off-exchange short volume in MLM by trade date
Trade dateShort volumeShort exemptOff-exchange volumeShort volume ratio
Nov 10, 2026171,173115319,12053.6%
Nov 9, 2026256,1300386,93366.2%
Nov 6, 2026287,8618461,71562.3%
Nov 5, 2026292,789185706,09441.5%
Nov 4, 2026426,84276808,09252.8%
Nov 3, 2026225,017161379,98159.2%
Nov 2, 2026382,73085729,54952.5%
Oct 30, 2026289,3981,085427,19667.7%
Oct 29, 2026499,31640759,72965.7%
Oct 28, 2026201,43749303,87566.3%
Oct 27, 2026114,753943191,73859.8%
Oct 26, 2026212,432738355,98659.7%
Oct 23, 2026203,6810279,67372.8%
Oct 22, 2026204,377271365,13256.0%
Oct 21, 2026137,736317204,69967.3%
Oct 20, 2026243,741101388,97962.7%
Oct 19, 2026193,855509380,31551.0%
Oct 16, 2026287,049564446,50064.3%
Oct 15, 2026294,56113479,31861.5%
Oct 14, 2026187,9482,614433,90743.3%
Oct 13, 2026109,3700302,04636.2%
Oct 12, 202697,4660227,80542.8%
Oct 9, 2026119,704454198,37860.3%
Oct 8, 2026228,1762339,66867.2%
Oct 7, 2026170,00139235,62772.1%
Oct 6, 2026147,802248306,22948.3%
Oct 5, 2026133,358117276,46848.2%
Oct 2, 2026205,915473324,27463.5%
Oct 1, 2026189,8305359,34252.8%
Sep 30, 2026206,737279333,25762.0%

ATS (dark pool) volume

Weekly volume on alternative trading systems (ATS) and other off-exchange (OTC) venues, from FINRA, for the last 12 weeks. ATS share is ATS volume ÷ (ATS + OTC volume), not a share of all trading.

Weekly ATS and OTC volume in MLM
Week ofTierATS sharesATS tradesOther OTC sharesOther OTC tradesATS share
Oct 19, 2026T11,286,19147,344686,22916,56365.2%
Oct 12, 2026T11,404,73950,587633,98220,11168.9%
Oct 5, 2026T11,064,30945,535371,62518,42174.1%
Sep 28, 2026T11,494,73651,451542,81820,30973.4%
Sep 21, 2026T11,950,12758,127551,37320,27478.0%
Sep 14, 2026T11,296,50550,542532,49622,62870.9%
Sep 7, 2026T11,191,90742,811418,65217,94474.0%
Aug 31, 2026T11,335,47553,403536,85421,07071.3%
Aug 24, 2026T1826,88740,115562,91914,81359.5%
Aug 17, 2026T11,186,93645,304619,24016,69965.7%
Aug 10, 2026T1552,13931,253233,67212,20070.3%
Aug 3, 2026T11,188,01147,635353,41517,03277.1%