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Merck & Co., Inc.

MRK
Exchange
NYSE
Industry
Pharmaceutical Preparations
SEC CIK
0000310158

No open-market purchases or sales by Merck & Co., Inc. insiders were filed in the last 90 days; 3,874 institutions reported holding it in 13F filings for Q2 2026, worth $254.3B in total; 4 superinvestors hold it, including Harris Associates (Oakmark) and Fairfax Financial.

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
26.6M
Shares, settlement Oct 30, 2026
Change
−220.9K
−0.8% vs. Oct 15, 2026
Days to cover
2.36
Short interest ÷ average daily volume
Average daily volume
11.3M
Shares, as reported by FINRA
Short interest by settlement date
Oct 31, 2024: 26,228,480 sharesNov 15, 2024: 26,322,944 sharesNov 29, 2024: 32,788,187 sharesDec 13, 2024: 32,027,522 sharesDec 31, 2024: 30,926,600 sharesJan 15, 2025: 34,124,663 sharesJan 31, 2025: 29,603,048 sharesFeb 14, 2025: 32,207,979 sharesFeb 28, 2025: 40,943,400 sharesMar 14, 2025: 37,125,881 sharesMar 31, 2025: 37,936,527 sharesApr 15, 2025: 41,933,919 sharesApr 30, 2025: 37,137,335 sharesMay 15, 2025: 41,266,612 sharesMay 30, 2025: 34,564,617 sharesJun 13, 2025: 35,799,415 sharesJun 30, 2025: 35,092,687 sharesJul 15, 2025: 28,773,023 sharesJul 31, 2025: 25,879,122 sharesAug 15, 2025: 25,529,478 sharesAug 29, 2025: 23,829,923 sharesSep 15, 2025: 27,709,865 sharesSep 30, 2025: 25,174,694 sharesOct 15, 2025: 26,700,419 sharesOct 31, 2025: 25,815,354 sharesNov 14, 2025: 27,626,151 sharesNov 28, 2025: 31,943,311 sharesDec 15, 2025: 37,162,304 sharesDec 31, 2025: 32,573,724 sharesJan 15, 2026: 33,654,686 sharesJan 30, 2026: 28,729,402 sharesFeb 13, 2026: 28,130,031 sharesFeb 27, 2026: 31,115,811 sharesMar 13, 2026: 29,144,880 sharesMar 31, 2026: 27,720,957 sharesApr 15, 2026: 27,495,690 sharesApr 30, 2026: 26,205,868 sharesMay 15, 2026: 29,060,187 sharesMay 29, 2026: 30,545,853 sharesJun 15, 2026: 30,267,292 sharesJun 30, 2026: 31,381,267 sharesJul 15, 2026: 29,359,028 sharesJul 31, 2026: 28,281,375 sharesAug 14, 2026: 24,506,520 sharesAug 31, 2026: 30,287,347 sharesSep 15, 2026: 34,430,712 sharesSep 30, 2026: 28,271,750 sharesOct 15, 2026: 26,825,098 sharesOct 30, 2026: 26,604,245 shares
Short interest in MRK by settlement date
Settlement dateShort interestChangeChange %Avg. daily volumeDays to cover
Oct 30, 202626.6M−220.9K−0.8%11.3M2.36
Oct 15, 202626.8M−1.45M−5.1%9.02M2.97
Sep 30, 202628.3M−6.16M−17.9%11.2M2.53
Sep 15, 202634.4M+4.14M+13.7%8.14M4.23
Aug 31, 202630.3M+5.78M+23.6%13.6M2.23
Aug 14, 202624.5M−3.77M−13.4%8.64M2.84
Jul 31, 202628.3M−1.08M−3.7%8.70M3.25
Jul 15, 202629.4M−2.02M−6.4%8.58M3.42
Jun 30, 202631.4M+1.11M+3.7%13.6M2.30
Jun 15, 202630.3M−278.6K−0.9%11.8M2.57
May 29, 202630.5M+1.49M+5.1%9.99M3.06
May 15, 202629.1M+2.85M+10.9%8.01M3.63
Apr 30, 202626.2M−1.29M−4.7%10.3M2.55
Apr 15, 202627.5M−225.3K−0.8%8.31M3.31
Mar 31, 202627.7M−1.42M−4.9%11.0M2.53
Mar 13, 202629.1M−1.97M−6.3%9.52M3.06
Feb 27, 202631.1M+2.99M+10.6%10.4M3.00
Feb 13, 202628.1M−599.4K−2.1%16.5M1.70
Jan 30, 202628.7M−4.93M−14.6%12.1M2.38
Jan 15, 202633.7M+1.08M+3.3%13.2M2.55
Dec 31, 202532.6M−4.59M−12.4%14.0M2.33
Dec 15, 202537.2M+5.22M+16.3%14.1M2.63
Nov 28, 202531.9M+4.32M+15.6%18.0M1.77
Nov 14, 202527.6M+1.81M+7.0%12.9M2.15
Oct 31, 202525.8M−885.1K−3.3%10.3M2.52
Oct 15, 202526.7M+1.53M+6.1%12.7M2.11
Sep 30, 202525.2M−2.54M−9.2%14.3M1.76
Sep 15, 202527.7M+3.88M+16.3%11.6M2.39
Aug 29, 202523.8M−1.70M−6.7%11.7M2.04
Aug 15, 202525.5M−349.6K−1.4%10.3M2.47
Jul 31, 202525.9M−2.89M−10.1%13.1M1.97
Jul 15, 202528.8M−6.32M−18.0%13.8M2.08
Jun 30, 202535.1M−706.7K−2.0%22.0M1.60
Jun 13, 202535.8M+1.23M+3.6%13.7M2.61
May 30, 202534.6M−6.70M−16.2%13.0M2.66
May 15, 202541.3M+4.13M+11.1%15.9M2.60
Apr 30, 202537.1M−4.80M−11.4%17.4M2.14
Apr 15, 202541.9M+4.00M+10.5%18.0M2.33
Mar 31, 202537.9M+810.6K+2.2%18.7M2.03
Mar 14, 202537.1M−3.82M−9.3%16.1M2.31
Feb 28, 202540.9M+8.74M+27.1%16.8M2.43
Feb 14, 202532.2M+2.60M+8.8%22.5M1.43
Jan 31, 202529.6M−4.52M−13.3%12.6M2.36
Jan 15, 202534.1M+3.20M+10.3%9.05M3.77
Dec 31, 202430.9M−1.10M−3.4%10.5M2.94
Dec 13, 202432.0M−760.7K−2.3%13.1M2.45
Nov 29, 202432.8M+6.47M+24.6%14.3M2.29
Nov 15, 202426.3M+94.5K+0.4%9.99M2.63
Oct 31, 202426.2M+186.7K+0.7%10.3M2.55

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 MRK by settlement date
Settlement dateSharesPriceValue
Oct 13, 20266,694$145.45$973.6K
Oct 9, 202669,948$142.38$9.96M
Oct 2, 202625$143.81$3.60K
Sep 30, 20265,675$149.28$847.2K
Sep 25, 202671$147.98$10.5K
Sep 15, 20266,473$144.85$937.6K
Sep 14, 20265,052$143.93$727.1K
Sep 8, 20267,268$150.33$1.09M
Aug 31, 20262,002$148.35$297.0K
Aug 28, 2026642$149.54$96.0K
Aug 27, 202616$153.10$2.45K
Aug 26, 2026192$156.45$30.0K
Aug 25, 20262$150.66$301.32
Aug 24, 202613,443$152.55$2.05M
Aug 20, 2026365$152.20$55.6K
Aug 13, 202678,575$132.92$10.4M
Aug 12, 202619$130.42$2.48K
Aug 10, 202638$128.58$4.89K
Aug 7, 20261$128.37$128.37
Aug 6, 20269,572$128.33$1.23M
Jul 28, 202612,660$130.76$1.66M
Jul 24, 2026534$130.48$69.7K
Jul 21, 202631$124.40$3.86K
Jul 20, 202668,205$127.50$8.70M
Jul 13, 2026100$123.54$12.4K
Jul 10, 2026785$125.07$98.2K
Jul 9, 202623,469$125.99$2.96M
Jul 6, 2026200$129.56$25.9K
Jul 1, 20261,987$128.50$255.3K
Jun 30, 20262,152$129.38$278.4K

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 MRK by trade date
Trade dateShort volumeShort exemptOff-exchange volumeShort volume ratio
Nov 13, 2026984,9335,4291,991,10749.5%
Nov 12, 20261,182,9572982,220,61453.3%
Nov 11, 2026946,24128,8572,380,34639.8%
Nov 10, 2026817,5401,2801,633,77050.0%
Nov 9, 20261,013,4667,2712,574,52139.4%
Nov 6, 2026895,7515,2352,108,80942.5%
Nov 5, 20261,590,8305,8353,698,43243.0%
Nov 4, 20261,087,7903,1103,198,10734.0%
Nov 3, 20261,041,9408202,989,62734.9%
Nov 2, 20261,297,3254,2232,762,39947.0%
Oct 30, 20261,244,3036,5894,037,50230.8%
Oct 29, 20261,164,40211,2954,644,59125.1%
Oct 28, 2026504,5942,0393,053,31716.5%
Oct 27, 20261,178,06715,9533,220,31436.6%
Oct 26, 20261,067,4251,5044,172,86825.6%
Oct 23, 20261,320,6753,1523,126,05942.2%
Oct 22, 20264,162,5202,8268,572,52048.6%
Oct 21, 20261,324,4201,1552,978,04944.5%
Oct 20, 20261,047,59625,9132,970,59135.3%
Oct 19, 2026850,02218,7723,505,84324.2%
Oct 16, 20261,455,1623,7153,522,47141.3%
Oct 15, 20261,777,9733,6604,326,86341.1%
Oct 14, 20262,223,6944,0014,348,42751.1%
Oct 13, 2026700,2511,4542,590,09227.0%
Oct 12, 2026872,9133,1702,146,18640.7%
Oct 9, 20261,504,1592,4842,965,76750.7%
Oct 8, 20261,203,5925,5783,192,99537.7%
Oct 7, 2026862,9955,8252,181,88439.6%
Oct 6, 20261,229,1926,9383,078,25639.9%
Oct 5, 2026822,0423,0453,426,76824.0%

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 MRK
Week ofTierATS sharesATS tradesOther OTC sharesOther OTC tradesATS share
Oct 19, 2026T114,363,750179,94012,506,55396,71853.5%
Oct 12, 2026T111,041,143171,91010,728,054104,39150.7%
Oct 5, 2026T19,707,657144,5079,960,38299,06249.4%
Sep 28, 2026T19,439,121147,81110,537,62785,81347.3%
Sep 21, 2026T110,287,123156,46710,234,18089,26150.1%
Sep 14, 2026T18,763,714140,68913,526,43978,91539.3%
Sep 7, 2026T18,091,617126,27510,441,59069,19343.7%
Aug 31, 2026T18,307,293138,28810,352,38185,85644.5%
Aug 24, 2026T113,257,928183,31212,245,985118,57752.0%
Aug 17, 2026T120,928,582259,06118,620,821164,89752.9%
Aug 10, 2026T18,203,038151,3939,484,80074,83146.4%
Aug 3, 2026T112,294,052191,70211,635,09682,39351.4%