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Atmus Filtration Technologies Inc.

ATMU
Exchange
NYSE
Industry
Motor Vehicle Parts & Accessories
SEC CIK
0001921963

In the last 90 days, Atmus Filtration Technologies Inc. insiders filed 0 open-market purchases and 1 sale; 337 institutions reported holding it in 13F filings for Q2 2026, worth $4.47B in total; no superinvestor holds it.

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
3.48M
Shares, settlement Oct 30, 2026
Change
+122.3K
+3.6% vs. Oct 15, 2026
Days to cover
5.49
Short interest ÷ average daily volume
Average daily volume
633.4K
Shares, as reported by FINRA
Short interest by settlement date
Oct 31, 2024: 2,568,160 sharesNov 15, 2024: 2,401,949 sharesNov 29, 2024: 2,226,493 sharesDec 13, 2024: 1,620,269 sharesDec 31, 2024: 1,815,597 sharesJan 15, 2025: 1,330,202 sharesJan 31, 2025: 1,988,893 sharesFeb 14, 2025: 1,402,280 sharesFeb 28, 2025: 1,537,947 sharesMar 14, 2025: 1,968,008 sharesMar 31, 2025: 2,022,459 sharesApr 15, 2025: 1,542,735 sharesApr 30, 2025: 1,348,271 sharesMay 15, 2025: 1,458,343 sharesMay 30, 2025: 1,385,959 sharesJun 13, 2025: 1,891,797 sharesJun 30, 2025: 2,114,351 sharesJul 15, 2025: 2,567,442 sharesJul 31, 2025: 2,202,685 sharesAug 15, 2025: 2,135,620 sharesAug 29, 2025: 2,208,406 sharesSep 15, 2025: 2,147,582 sharesSep 30, 2025: 2,057,426 sharesOct 15, 2025: 1,724,962 sharesOct 31, 2025: 1,873,919 sharesNov 14, 2025: 1,887,155 sharesNov 28, 2025: 1,870,896 sharesDec 15, 2025: 2,023,198 sharesDec 31, 2025: 2,369,861 sharesJan 15, 2026: 2,623,382 sharesJan 30, 2026: 2,329,732 sharesFeb 13, 2026: 2,014,325 sharesFeb 27, 2026: 1,955,535 sharesMar 13, 2026: 2,293,004 sharesMar 31, 2026: 2,423,756 sharesApr 15, 2026: 4,358,706 sharesApr 30, 2026: 3,708,685 sharesMay 15, 2026: 3,543,464 sharesMay 29, 2026: 3,181,341 sharesJun 15, 2026: 3,154,714 sharesJun 30, 2026: 3,393,791 sharesJul 15, 2026: 2,964,034 sharesJul 31, 2026: 2,907,077 sharesAug 14, 2026: 3,050,905 sharesAug 31, 2026: 3,807,016 sharesSep 15, 2026: 3,087,685 sharesSep 30, 2026: 3,400,405 sharesOct 15, 2026: 3,358,055 sharesOct 30, 2026: 3,480,307 shares
Short interest in ATMU by settlement date
Settlement dateShort interestChangeChange %Avg. daily volumeDays to cover
Oct 30, 20263.48M+122.3K+3.6%633.4K5.49
Oct 15, 20263.36M−42.4K−1.3%682.6K4.92
Sep 30, 20263.40M+312.7K+10.1%903.2K3.76
Sep 15, 20263.09M−719.3K−18.9%610.7K5.06
Aug 31, 20263.81M+756.1K+24.8%518.3K7.34
Aug 14, 20263.05M+143.8K+5.0%900.3K3.39
Jul 31, 20262.91M−57.0K−1.9%543.1K5.35
Jul 15, 20262.96M−429.8K−12.7%592.2K5.01
Jun 30, 20263.39M+239.1K+7.6%1.12M3.03
Jun 15, 20263.15M−26.6K−0.8%897.5K3.51
May 29, 20263.18M−362.1K−10.2%848.0K3.75
May 15, 20263.54M−165.2K−4.5%1.49M2.38
Apr 30, 20263.71M−650.0K−14.9%947.2K3.92
Apr 15, 20264.36M+1.93M+79.8%2.62M1.66
Mar 31, 20262.42M+130.8K+5.7%770.8K3.14
Mar 13, 20262.29M+337.5K+17.3%811.6K2.83
Feb 27, 20261.96M−58.8K−2.9%995.9K1.96
Feb 13, 20262.01M−315.4K−13.5%1.13M1.78
Jan 30, 20262.33M−293.6K−11.2%507.5K4.59
Jan 15, 20262.62M+253.5K+10.7%463.1K5.66
Dec 31, 20252.37M+346.7K+17.1%649.8K3.65
Dec 15, 20252.02M+152.3K+8.1%695.1K2.91
Nov 28, 20251.87M−16.3K−0.9%890.9K2.10
Nov 14, 20251.89M+13.2K+0.7%808.8K2.33
Oct 31, 20251.87M+149.0K+8.6%612.2K3.06
Oct 15, 20251.72M−332.5K−16.2%547.9K3.15
Sep 30, 20252.06M−90.2K−4.2%752.8K2.73
Sep 15, 20252.15M−60.8K−2.8%753.0K2.85
Aug 29, 20252.21M+72.8K+3.4%714.1K3.09
Aug 15, 20252.14M−67.1K−3.0%1.06M2.02
Jul 31, 20252.20M−364.8K−14.2%531.0K4.15
Jul 15, 20252.57M+453.1K+21.4%707.1K3.63
Jun 30, 20252.11M+222.6K+11.8%830.3K2.55
Jun 13, 20251.89M+505.8K+36.5%597.3K3.17
May 30, 20251.39M−72.4K−5.0%800.5K1.73
May 15, 20251.46M+110.1K+8.2%677.6K2.15
Apr 30, 20251.35M−194.5K−12.6%694.9K1.94
Apr 15, 20251.54M−479.7K−23.7%1.07M1.44
Mar 31, 20252.02M+54.5K+2.8%1.07M1.90
Mar 14, 20251.97M+430.1K+28.0%1.10M1.79
Feb 28, 20251.54M+135.7K+9.7%1.06M1.45
Feb 14, 20251.40M−586.6K−29.5%569.9K2.46
Jan 31, 20251.99M+658.7K+49.5%625.0K3.18
Jan 15, 20251.33M−485.4K−26.7%608.3K2.19
Dec 31, 20241.82M+195.3K+12.1%536.3K3.39
Dec 13, 20241.62M−606.2K−27.2%928.9K1.74
Nov 29, 20242.23M−175.5K−7.3%635.6K3.50
Nov 15, 20242.40M−166.2K−6.5%1.01M2.37
Oct 31, 20242.57M−51.2K−2.0%694.3K3.70

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 ATMU by settlement date
Settlement dateSharesPriceValue
Oct 9, 20261$42.62$42.62
Sep 30, 202651$43.94$2.24K
Sep 22, 20262,006$44.59$89.4K
Sep 3, 2026555$47.29$26.2K
Aug 19, 20268$49.89$399.12
Aug 5, 20262,532$55.12$139.6K
Aug 4, 2026447$53.88$24.1K
Jul 17, 20261,769$52.45$92.8K
Jul 15, 20262,848$52.07$148.3K
Jun 30, 202642,634$51.00$2.17M
Jun 4, 2026158$47.37$7.48K
Jun 2, 20261,089$45.70$49.8K
May 22, 20262$48.43$96.86
May 12, 20261$56.60$56.6
May 7, 2026749$54.25$40.6K
May 4, 202642$52.65$2.21K
May 1, 202631,459$63.40$1.99M
Apr 21, 202612$63.03$756.36
Apr 20, 202620$63.38$1.27K
Mar 30, 202618$58.07$1.05K
Mar 18, 20264$56.65$226.6
Mar 4, 2026252$62.85$15.8K
Mar 3, 20262,868$65.57$188.1K
Feb 17, 20261$64.12$64.12
Feb 12, 20261$63.00$63
Jan 20, 2026100$56.68$5.67K
Nov 20, 2025626$46.92$29.4K
Nov 19, 2025626$46.26$29.0K
Nov 17, 202516$47.64$762.24
Nov 14, 202516$48.69$779.04

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 ATMU by trade date
Trade dateShort volumeShort exemptOff-exchange volumeShort volume ratio
Nov 12, 2026105,6950240,19644.0%
Nov 11, 2026121,6020241,87750.3%
Nov 10, 2026172,024100296,46058.0%
Nov 9, 2026180,5790345,40952.3%
Nov 6, 2026219,322100338,98364.7%
Nov 5, 2026241,98011,511319,36575.8%
Nov 4, 2026132,4040182,59672.5%
Nov 3, 2026155,9560232,64967.0%
Nov 2, 2026205,2600327,11062.7%
Oct 30, 2026168,7080234,81371.8%
Oct 29, 2026119,2440179,42366.5%
Oct 28, 2026112,508339179,47062.7%
Oct 27, 2026185,5380361,59351.3%
Oct 26, 202695,6850225,35042.5%
Oct 23, 202693,4020132,71070.4%
Oct 22, 2026128,5520202,24863.6%
Oct 21, 202691,1980126,14772.3%
Oct 20, 2026181,1720275,91065.7%
Oct 19, 2026193,1580260,68274.1%
Oct 16, 2026125,2400324,58738.6%
Oct 15, 2026116,1210536,71121.6%
Oct 14, 202672,5880165,14844.0%
Oct 13, 202679,1570192,98041.0%
Oct 12, 202659,9470113,46752.8%
Oct 9, 202687,980311202,69843.4%
Oct 8, 2026160,85548441,88936.4%
Oct 7, 2026103,47313189,86554.5%
Oct 6, 202682,175457135,52060.6%
Oct 5, 2026148,50252236,80262.7%
Oct 2, 2026232,6920360,93764.5%

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 ATMU
Week ofTierATS sharesATS tradesOther OTC sharesOther OTC tradesATS share
Oct 5, 2026T2971,39926,269425,6894,28769.5%
Sep 28, 2026T21,305,37427,964754,2515,30663.4%
Sep 21, 2026T2669,64022,592398,2655,27562.7%
Sep 14, 2026T2870,13526,2101,721,0684,46033.6%
Sep 7, 2026T2473,42116,681268,3412,86463.8%
Aug 31, 2026T2832,65023,719547,9895,57760.3%
Aug 24, 2026T2716,83020,026292,6083,36971.0%
Aug 17, 2026T2877,29128,464263,4563,99276.9%
Aug 10, 2026T21,877,77227,183895,6313,77767.7%
Aug 3, 2026T21,270,69834,106337,7084,38479.0%
Jul 27, 2026T2667,23825,681340,7123,22066.2%
Jul 20, 2026T2689,84220,918271,4243,38671.8%