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Livermore
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ZHEN

Mastec Inc

MTZ
Exchange
NYSE
Industry
Water, Sewer, Pipeline, Comm & Power Line Construction
SEC CIK
0000015615

In the last 90 days, Mastec Inc insiders filed 0 open-market purchases and 1 sale; 915 institutions reported holding it in 13F filings for Q2 2026, worth $24.7B in total; 4 superinvestors hold it, including Lone Pine Capital and Coatue Management.

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
4.76M
Shares, settlement Oct 30, 2026
Change
+282.3K
+6.3% vs. Oct 15, 2026
Days to cover
2.98
Short interest ÷ average daily volume
Average daily volume
1.59M
Shares, as reported by FINRA
Short interest by settlement date
Oct 31, 2024: 2,268,459 sharesNov 15, 2024: 2,096,631 sharesNov 29, 2024: 2,022,028 sharesDec 13, 2024: 2,274,614 sharesDec 31, 2024: 1,942,568 sharesJan 15, 2025: 2,107,613 sharesJan 31, 2025: 1,986,217 sharesFeb 14, 2025: 1,739,261 sharesFeb 28, 2025: 1,872,132 sharesMar 14, 2025: 1,921,185 sharesMar 31, 2025: 1,178,071 sharesApr 15, 2025: 1,314,353 sharesApr 30, 2025: 1,741,644 sharesMay 15, 2025: 1,464,039 sharesMay 30, 2025: 1,021,665 sharesJun 13, 2025: 1,126,542 sharesJun 30, 2025: 849,740 sharesJul 15, 2025: 1,213,975 sharesJul 31, 2025: 1,168,896 sharesAug 15, 2025: 1,536,126 sharesAug 29, 2025: 1,704,878 sharesSep 15, 2025: 1,641,832 sharesSep 30, 2025: 1,632,171 sharesOct 15, 2025: 1,789,339 sharesOct 31, 2025: 1,654,215 sharesNov 14, 2025: 1,974,852 sharesNov 28, 2025: 2,782,510 sharesDec 15, 2025: 2,795,936 sharesDec 31, 2025: 2,424,821 sharesJan 15, 2026: 3,034,907 sharesJan 30, 2026: 2,819,453 sharesFeb 13, 2026: 2,455,571 sharesFeb 27, 2026: 2,569,390 sharesMar 13, 2026: 2,564,253 sharesMar 31, 2026: 2,834,389 sharesApr 15, 2026: 3,014,187 sharesApr 30, 2026: 3,107,809 sharesMay 15, 2026: 3,236,026 sharesMay 29, 2026: 3,333,421 sharesJun 15, 2026: 3,682,003 sharesJun 30, 2026: 4,404,328 sharesJul 15, 2026: 4,236,441 sharesJul 31, 2026: 4,427,169 sharesAug 14, 2026: 5,253,497 sharesAug 31, 2026: 5,309,659 sharesSep 15, 2026: 5,417,357 sharesSep 30, 2026: 4,593,756 sharesOct 15, 2026: 4,473,139 sharesOct 30, 2026: 4,755,418 shares
Short interest in MTZ by settlement date
Settlement dateShort interestChangeChange %Avg. daily volumeDays to cover
Oct 30, 20264.76M+282.3K+6.3%1.59M2.98
Oct 15, 20264.47M−120.6K−2.6%1.40M3.19
Sep 30, 20264.59M−823.6K−15.2%1.76M2.61
Sep 15, 20265.42M+107.7K+2.0%1.32M4.09
Aug 31, 20265.31M+56.2K+1.1%1.47M3.61
Aug 14, 20265.25M+826.3K+18.7%1.62M3.23
Jul 31, 20264.43M+190.7K+4.5%1.66M2.67
Jul 15, 20264.24M−167.9K−3.8%997.0K4.25
Jun 30, 20264.40M+722.3K+19.6%1.38M3.20
Jun 15, 20263.68M+348.6K+10.5%1.04M3.53
May 29, 20263.33M+97.4K+3.0%1.41M2.36
May 15, 20263.24M+128.2K+4.1%1.12M2.89
Apr 30, 20263.11M+93.6K+3.1%849.9K3.66
Apr 15, 20263.01M+179.8K+6.3%656.1K4.59
Mar 31, 20262.83M+270.1K+10.5%1.06M2.67
Mar 13, 20262.56M−5.14K−0.2%1.09M2.35
Feb 27, 20262.57M+113.8K+4.6%1.12M2.29
Feb 13, 20262.46M−363.9K−12.9%943.3K2.60
Jan 30, 20262.82M−215.5K−7.1%659.3K4.28
Jan 15, 20263.03M+610.1K+25.2%1.15M2.64
Dec 31, 20252.42M−371.1K−13.3%641.5K3.78
Dec 15, 20252.80M+13.4K+0.5%891.6K3.14
Nov 28, 20252.78M+807.7K+40.9%787.0K3.54
Nov 14, 20251.97M+320.6K+19.4%782.8K2.52
Oct 31, 20251.65M−135.1K−7.6%1.12M1.48
Oct 15, 20251.79M+157.2K+9.6%966.2K1.85
Sep 30, 20251.63M−9.66K−0.6%932.4K1.75
Sep 15, 20251.64M−63.0K−3.7%920.1K1.78
Aug 29, 20251.70M+168.8K+11.0%865.1K1.97
Aug 15, 20251.54M+367.2K+31.4%1.17M1.31
Jul 31, 20251.17M−45.1K−3.7%964.7K1.21
Jul 15, 20251.21M+364.2K+42.9%819.8K1.48
Jun 30, 2025849.7K−276.8K−24.6%897.0K1.00
Jun 13, 20251.13M+104.9K+10.3%656.9K1.71
May 30, 20251.02M−442.4K−30.2%831.6K1.23
May 15, 20251.46M−277.6K−15.9%1.05M1.39
Apr 30, 20251.74M+427.3K+32.5%762.4K2.28
Apr 15, 20251.31M+136.3K+11.6%1.29M1.02
Mar 31, 20251.18M−743.1K−38.7%1.40M1.00
Mar 14, 20251.92M+49.1K+2.6%1.50M1.28
Feb 28, 20251.87M+132.9K+7.6%1.42M1.32
Feb 14, 20251.74M−247.0K−12.4%839.4K2.07
Jan 31, 20251.99M−121.4K−5.8%1.18M1.69
Jan 15, 20252.11M+165.0K+8.5%895.7K2.35
Dec 31, 20241.94M−332.0K−14.6%808.7K2.40
Dec 13, 20242.27M+252.6K+12.5%803.7K2.83
Nov 29, 20242.02M−74.6K−3.6%845.7K2.39
Nov 15, 20242.10M−171.8K−7.6%1.12M1.87
Oct 31, 20242.27M−261.1K−10.3%656.1K3.46

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 MTZ by settlement date
Settlement dateSharesPriceValue
Oct 13, 20268$206.85$1.65K
Oct 2, 20265,313$213.66$1.14M
Oct 1, 2026558$213.62$119.2K
Sep 21, 202644$214.38$9.43K
Sep 17, 20262$225.62$451.24
Sep 16, 20266$222.70$1.34K
Sep 11, 20265,912$232.20$1.37M
Aug 31, 2026293$241.00$70.6K
Aug 17, 202691$297.59$27.1K
Aug 11, 20265$268.28$1.34K
Jul 16, 2026512$357.71$183.1K
Jul 10, 202650$384.72$19.2K
Jul 1, 202637$416.06$15.4K
Jun 30, 202648,687$429.09$20.9M
Jun 24, 202617$390.44$6.64K
Jun 22, 202649,586$379.66$18.8M
Jun 18, 20261,237$374.91$463.8K
Jun 15, 2026216$362.97$78.4K
Jun 12, 20261,891$358.50$677.9K
Jun 4, 20263,042$369.66$1.12M
May 14, 20261,443$423.79$611.5K
May 5, 20261,030$425.39$438.2K
Apr 20, 2026789$370.89$292.6K
Apr 9, 202612$348.11$4.18K
Mar 26, 20261,266$323.55$409.6K
Mar 23, 2026104$300.58$31.3K
Mar 20, 20265,952$312.72$1.86M
Feb 27, 202693$289.96$27.0K
Feb 25, 2026148$287.70$42.6K
Jan 23, 2026529$244.57$129.4K

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 MTZ by trade date
Trade dateShort volumeShort exemptOff-exchange volumeShort volume ratio
Nov 10, 2026311,9411,528527,62259.1%
Nov 9, 2026564,3782,769861,94465.5%
Nov 6, 2026882,04817,1741,341,16365.8%
Nov 5, 2026610,65415,1301,658,40236.8%
Nov 4, 2026714,41837,3611,349,59452.9%
Nov 3, 2026546,9993,663780,53570.1%
Nov 2, 2026600,6951081,061,24556.6%
Oct 30, 2026666,9773541,611,03241.4%
Oct 29, 2026557,8630875,51863.7%
Oct 28, 2026275,4197529,50752.0%
Oct 27, 2026250,4352,522382,22065.5%
Oct 26, 2026299,2512,021502,83659.5%
Oct 23, 2026212,552583510,23941.7%
Oct 22, 2026336,18615,310947,74435.5%
Oct 21, 2026367,04136887,01141.4%
Oct 20, 2026153,24198347,78044.1%
Oct 19, 2026192,39371388,82549.5%
Oct 16, 2026204,8230557,13736.8%
Oct 15, 2026275,9250846,24532.6%
Oct 14, 2026190,42240713,87326.7%
Oct 13, 2026284,0370732,27638.8%
Oct 12, 2026163,879902411,41039.8%
Oct 9, 2026278,5542763,82236.5%
Oct 8, 2026363,45910706,71151.4%
Oct 7, 2026368,575479554,88366.4%
Oct 6, 2026383,448682556,29768.9%
Oct 5, 2026294,080430558,35552.7%
Oct 2, 2026324,073116550,11558.9%
Oct 1, 2026264,3764466,97556.6%
Sep 30, 2026398,849654776,91851.3%

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 MTZ
Week ofTierATS sharesATS tradesOther OTC sharesOther OTC tradesATS share
Oct 19, 2026T12,183,79964,2921,064,60221,19367.2%
Oct 12, 2026T12,421,26264,708954,72126,26371.7%
Oct 5, 2026T12,360,36962,026956,37024,11371.2%
Sep 28, 2026T12,362,07668,5531,102,65522,11568.2%
Sep 21, 2026T12,094,14763,9851,115,67718,87765.2%
Sep 14, 2026T13,625,06092,8641,339,20823,66773.0%
Sep 7, 2026T11,382,04951,607587,73914,87970.2%
Aug 31, 2026T12,721,45268,793866,70620,11675.8%
Aug 24, 2026T12,699,51074,468975,71623,15873.5%
Aug 17, 2026T12,468,72875,420824,55922,68075.0%
Aug 10, 2026T12,881,90178,238672,85818,34281.1%
Aug 3, 2026T12,444,03177,323904,47628,16873.0%