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Costco Wholesale Corp

COST
Exchange
Nasdaq
Industry
Retail-Variety Stores
SEC CIK
0000909832

In the last 90 days, Costco Wholesale Corp insiders filed 0 open-market purchases and 5 sales; 4,282 institutions reported holding it in 13F filings for Q2 2026, worth $301.9B in total; 4 superinvestors hold it, including Markel Group 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
7.89M
Shares, settlement Oct 30, 2026
Change
+290.8K
+3.8% vs. Oct 15, 2026
Days to cover
3.55
Short interest ÷ average daily volume
Average daily volume
2.22M
Shares, as reported by FINRA
Short interest by settlement date
Oct 31, 2024: 5,993,302 sharesNov 15, 2024: 6,485,763 sharesNov 29, 2024: 6,588,840 sharesDec 13, 2024: 6,454,378 sharesDec 31, 2024: 6,541,237 sharesJan 15, 2025: 6,355,090 sharesJan 31, 2025: 5,889,145 sharesFeb 14, 2025: 6,935,102 sharesFeb 28, 2025: 7,080,224 sharesMar 14, 2025: 6,866,248 sharesMar 31, 2025: 5,945,254 sharesApr 15, 2025: 6,044,126 sharesApr 30, 2025: 6,031,885 sharesMay 15, 2025: 6,168,845 sharesMay 30, 2025: 5,463,586 sharesJun 13, 2025: 5,131,365 sharesJun 30, 2025: 5,679,064 sharesJul 15, 2025: 4,863,899 sharesJul 31, 2025: 5,570,606 sharesAug 15, 2025: 5,905,078 sharesAug 29, 2025: 6,839,849 sharesSep 15, 2025: 6,542,302 sharesSep 30, 2025: 6,685,683 sharesOct 15, 2025: 6,948,318 sharesOct 31, 2025: 6,934,489 sharesNov 14, 2025: 7,220,010 sharesNov 28, 2025: 7,678,174 sharesDec 15, 2025: 6,737,305 sharesDec 31, 2025: 7,456,384 sharesJan 15, 2026: 7,859,282 sharesJan 30, 2026: 7,122,161 sharesFeb 13, 2026: 7,002,026 sharesFeb 27, 2026: 6,388,788 sharesMar 13, 2026: 6,295,610 sharesMar 31, 2026: 6,300,039 sharesApr 15, 2026: 6,550,081 sharesApr 30, 2026: 6,725,461 sharesMay 15, 2026: 7,357,205 sharesMay 29, 2026: 7,878,688 sharesJun 15, 2026: 7,837,886 sharesJun 30, 2026: 7,284,892 sharesJul 15, 2026: 6,957,664 sharesJul 31, 2026: 7,655,966 sharesAug 14, 2026: 7,364,782 sharesAug 31, 2026: 7,577,940 sharesSep 15, 2026: 7,360,574 sharesSep 30, 2026: 7,325,824 sharesOct 15, 2026: 7,600,821 sharesOct 30, 2026: 7,891,668 shares
Short interest in COST by settlement date
Settlement dateShort interestChangeChange %Avg. daily volumeDays to cover
Oct 30, 20267.89M+290.8K+3.8%2.22M3.55
Oct 15, 20267.60M+275.0K+3.8%2.04M3.73
Sep 30, 20267.33M−34.8K−0.5%2.68M2.74
Sep 15, 20267.36M−217.4K−2.9%2.01M3.67
Aug 31, 20267.58M+213.2K+2.9%1.85M4.09
Aug 14, 20267.36M−291.2K−3.8%1.68M4.38
Jul 31, 20267.66M+698.3K+10.0%2.04M3.75
Jul 15, 20266.96M−327.2K−4.5%2.53M2.75
Jun 30, 20267.28M−553.0K−7.1%2.99M2.44
Jun 15, 20267.84M−40.8K−0.5%2.17M3.61
May 29, 20267.88M+521.5K+7.1%2.94M2.68
May 15, 20267.36M+631.7K+9.4%1.84M3.99
Apr 30, 20266.73M+175.4K+2.7%1.65M4.08
Apr 15, 20266.55M+250.0K+4.0%1.92M3.42
Mar 31, 20266.30M+4.43K+0.1%1.63M3.87
Mar 13, 20266.30M−93.2K−1.5%1.95M3.23
Feb 27, 20266.39M−613.2K−8.8%1.83M3.50
Feb 13, 20267.00M−120.1K−1.7%2.42M2.90
Jan 30, 20267.12M−737.1K−9.4%2.59M2.75
Jan 15, 20267.86M+402.9K+5.4%2.89M2.72
Dec 31, 20257.46M+719.1K+10.7%2.81M2.65
Dec 15, 20256.74M−940.9K−12.3%2.94M2.29
Nov 28, 20257.68M+458.2K+6.4%2.61M2.94
Nov 14, 20257.22M+285.5K+4.1%2.47M2.92
Oct 31, 20256.93M−13.8K−0.2%2.14M3.24
Oct 15, 20256.95M+262.6K+3.9%2.49M2.79
Sep 30, 20256.69M+143.4K+2.2%3.01M2.22
Sep 15, 20256.54M−297.5K−4.4%1.75M3.74
Aug 29, 20256.84M+934.8K+15.8%2.34M2.93
Aug 15, 20255.91M+334.5K+6.0%2.20M2.69
Jul 31, 20255.57M+706.7K+14.5%2.12M2.63
Jul 15, 20254.86M−815.2K−14.4%1.97M2.47
Jun 30, 20255.68M+547.7K+10.7%2.13M2.67
Jun 13, 20255.13M−332.2K−6.1%2.05M2.51
May 30, 20255.46M−705.3K−11.4%2.16M2.53
May 15, 20256.17M+137.0K+2.3%1.87M3.29
Apr 30, 20256.03M−12.2K−0.2%2.20M2.75
Apr 15, 20256.04M+98.9K+1.7%3.27M1.85
Mar 31, 20255.95M−921.0K−13.4%2.16M2.75
Mar 14, 20256.87M−214.0K−3.0%3.13M2.19
Feb 28, 20257.08M+145.1K+2.1%1.93M3.67
Feb 14, 20256.94M+1.05M+17.8%1.89M3.66
Jan 31, 20255.89M−465.9K−7.3%1.94M3.04
Jan 15, 20256.36M−186.1K−2.9%1.87M3.39
Dec 31, 20246.54M+86.9K+1.4%2.23M2.94
Dec 13, 20246.45M−134.5K−2.0%1.97M3.28
Nov 29, 20246.59M+103.1K+1.6%1.83M3.60
Nov 15, 20246.49M+492.5K+8.2%2.03M3.20
Oct 31, 20245.99M−152.4K−2.5%1.45M4.13

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 COST by settlement date
Settlement dateSharesPriceValue
Oct 13, 20267,194$959.44$6.90M
Oct 8, 20263$942.25$2.83K
Oct 6, 20263$923.52$2.77K
Oct 5, 2026100$920.65$92.1K
Oct 2, 2026441$914.94$403.5K
Sep 30, 202646$924.59$42.5K
Sep 28, 2026915$922.77$844.3K
Sep 24, 2026732$904.70$662.2K
Sep 21, 20269,643$895.31$8.63M
Aug 26, 202621$960.01$20.2K
Aug 25, 20267,663$971.40$7.44M
Aug 21, 202621$933.51$19.6K
Aug 19, 2026473$961.35$454.7K
Aug 18, 202619$953.50$18.1K
Aug 17, 20268,285$961.10$7.96M
Aug 13, 20267$949.58$6.65K
Aug 11, 20262,208$952.75$2.10M
Aug 10, 20263,000$947.82$2.84M
Aug 7, 2026621$949.15$589.4K
Aug 3, 2026886$951.89$843.4K
Jul 29, 2026312$966.58$301.6K
Jul 28, 202649$951.58$46.6K
Jul 24, 2026533$926.06$493.6K
Jul 23, 202617$927.31$15.8K
Jul 20, 202615$940.87$14.1K
Jul 14, 202613$926.43$12.0K
Jul 13, 2026674$916.25$617.6K
Jul 10, 202632$912.97$29.2K
Jul 7, 2026177$950.25$168.2K
Jul 6, 20261,581$951.67$1.50M

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 COST by trade date
Trade dateShort volumeShort exemptOff-exchange volumeShort volume ratio
Nov 13, 2026453,22229706,80964.1%
Nov 12, 2026464,492615774,57960.0%
Nov 11, 2026520,754867896,50558.1%
Nov 10, 2026292,53926489,81459.7%
Nov 9, 2026377,5161,902712,08853.0%
Nov 6, 2026466,1591,151820,72556.8%
Nov 5, 2026909,0173,6021,618,40756.2%
Nov 4, 2026344,6821,477759,02645.4%
Nov 3, 2026238,173425559,01642.6%
Nov 2, 2026553,1411,9511,047,47752.8%
Oct 30, 2026517,5911,4251,159,85044.6%
Oct 29, 2026274,202189548,47450.0%
Oct 28, 2026299,693590537,96555.7%
Oct 27, 2026189,491310566,61433.4%
Oct 26, 2026230,717461622,73837.0%
Oct 23, 2026284,189204588,92648.3%
Oct 22, 2026391,3041,287809,17048.4%
Oct 21, 2026253,159974490,49951.6%
Oct 20, 2026378,069685666,12356.8%
Oct 19, 2026327,433364631,57551.8%
Oct 16, 2026328,481464699,09547.0%
Oct 15, 2026478,9721,0611,182,33640.5%
Oct 14, 2026504,1102,8451,171,19943.0%
Oct 13, 2026206,1782,136467,18444.1%
Oct 12, 2026259,102912586,00944.2%
Oct 9, 2026193,858128569,68434.0%
Oct 8, 2026372,191973912,75340.8%
Oct 7, 2026366,185440753,59648.6%
Oct 6, 2026284,389607653,53143.5%
Oct 5, 2026329,7031,448756,16843.6%

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 COST
Week ofTierATS sharesATS tradesOther OTC sharesOther OTC tradesATS share
Oct 19, 2026T11,946,47490,8713,447,854156,92236.1%
Oct 12, 2026T12,439,630106,1172,554,487173,63548.9%
Oct 5, 2026T12,187,63994,9462,670,112162,00445.0%
Sep 28, 2026T12,403,792108,9042,793,274167,58546.3%
Sep 21, 2026T12,896,726118,5213,230,236213,17547.3%
Sep 14, 2026T11,951,072102,9793,438,242196,00436.2%
Sep 7, 2026T11,489,56683,9682,101,210169,14841.5%
Aug 31, 2026T11,968,704102,2652,701,570180,16942.2%
Aug 24, 2026T11,486,85387,3382,540,372146,91836.9%
Aug 17, 2026T11,926,47794,5852,379,383145,65444.7%
Aug 10, 2026T11,433,24880,8931,720,766128,64445.4%
Aug 3, 2026T11,739,59193,8352,541,918150,53840.6%