13F Filings History of ACK Asset Management LLC

Latest 13F report
Q4 2025 - 13 Feb 2026
Value $
$796,756,840
Signature - Title
Andres Aguirre - CCO
Location
Greenwich, CT
Summary
This page shows a list of all the recent 13F filings made by ACK Asset Management LLC. Form 13F is required to be filed within 45 days of the end of a calendar quarter. ACK Asset Management LLC reported 23 stock holdings with total value $796,756,840 as of Q4 2025. Top holdings included MTRN, GVA, WMS, ATS, and CNM.

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Holdings Value
Quarter Holdings Value $ Bought Sold Net Top Holdings Form Type Filing Time
Q4 2025 23 $796,756,840 +$175,834,577 -$197,573,082 -$21,738,505 MTRN, GVA, WMS, ATS, CNM 13F-HR 13 Feb 2026, 11:54
Q3 2025 20 $799,134,177 +$268,515,955 -$297,146,954 -$28,630,999 ENS, MTRN, GVA, ATRO, WMS 13F-HR 14 Nov 2025, 16:52
Q2 2025 21 $761,426,347 +$231,156,429 -$222,004,946 +$9,151,483 ATRO, ATS, DY, GVA, ENS 13F-HR 13 Aug 2025, 09:16
Q1 2025 20 $608,959,301 +$55,614,378 -$114,905,236 -$59,290,858 DY, ENS, MTZ, ATS, ATRO 13F-HR 13 May 2025, 09:17
Q4 2024 22 $746,424,192 +$169,325,085 -$222,751,228 -$53,426,143 DY, MTZ, ATS, ENS, ROG 13F-HR 13 Feb 2025, 09:58
Q3 2024 18 $809,196,810 +$92,150,436 -$126,023,977 -$33,873,541 DY, MTZ, ENS, ROG, ATS 13F-HR 13 Nov 2024, 12:01
Q2 2024 19 $810,285,950 +$213,683,860 -$259,422,180 -$45,738,320 DY, MTZ, ENS, ROG, CNM 13F-HR 13 Aug 2024, 11:33
Q1 2024 20 $858,303,468 +$55,865,790 -$74,645,620 -$18,779,830 CNM, DY, ATKR, MTZ, ENS 13F-HR 14 May 2024, 10:05
Q4 2023 21 $831,322,503 +$180,762,301 -$88,731,054 +$92,031,247 MTRN, DY, MTZ, ENS, ATKR 13F-HR 13 Feb 2024, 12:06
Q3 2023 21 $688,243,000 +$41,829,589 -$57,539,132 -$15,709,543 ENS, ATKR, ATS, MTRN, ROG 13F-HR 13 Nov 2023, 12:13
Q2 2023 23 $802,904,000 +$112,599,570 -$51,638,000 +$60,961,570 ENS, MTZ, ROG, ATS, ATKR Restatement 14 Aug 2023, 20:06
Q1 2023 23 $655,113,000 +$100,181,923 -$64,776,377 +$35,405,546 ROG, MTRN, ENS, EME, DY 13F-HR 12 May 2023, 11:43
Q4 2022 25 $544,615,000 +$203,794,857 -$102,939,105 +$100,855,752 MTRN, EME, ROG, ENS, DY 13F-HR 14 Feb 2023, 14:06
Q3 2022 23 $377,516,000 +$79,662,668 -$66,198,177 +$13,464,491 EME, MTRN, ENS, ATSAF, ALNT 13F-HR 14 Nov 2022, 09:30
Q2 2022 21 $357,318,000 +$97,872,365 -$127,555,666 -$29,683,301 MTRN, VMI, EME, ATSAF, JBT 13F-HR 15 Aug 2022, 12:25
Q1 2022 24 $460,955,000 +$10,954,471 -$39,731,066 -$28,776,595 ENS, MTRN, BLDR, TGI, VMI 13F-HR 13 May 2022, 12:00
Q4 2021 27 $213,825,000 $0 $0 $0 ENS, RMBL, TGI, ATSAF, MBUU 13F-HR 14 Feb 2022, 11:49
Q3 2021 26 $215,740,000 $0 $0 $0 ENS, TGI, RMBL, MTRN, ATSAF 13F-HR 12 Nov 2021, 12:38
Q2 2021 24 $248,263,000 $0 $0 $0 ENS, TGI, ROG, MTRN, THRM 13F-HR 13 Jul 2021, 12:02
Q1 2021 23 $77,947,000 $0 $0 $0 TGI, THRY, ATCX, ATSAF, JBT 13F-HR 14 May 2021, 12:00
Q4 2020 25 $42,028,000 $0 $0 $0 ATSAF, JBT, DOOR, BBCP, ACAM 13F-HR 12 Feb 2021, 14:59
Q3 2020 19 $144,528,000 +$26,612,069 -$26,414,865 +$197,204 DY, ROG, ENS, ALNT, BBCP 13F-HR 13 Nov 2020, 12:40
Q2 2020 20 $156,682,000 +$40,552,930 -$17,910,710 +$22,642,220 DY, ROG, ENS, PWR, ALNT 13F-HR 13 Aug 2020, 14:40
Q1 2020 20 $66,069,000 $0 $0 $0 PWR, BMCH, PRSP, LUNA, KW 13F-HR 14 May 2020, 14:21
Q4 2019 23 $259,647,000 +$90,052,346 -$59,626,325 +$30,426,021 DY, ENS, ATSG, PWR, BBCP 13F-HR 12 Feb 2020, 16:12
Q3 2019 25 $280,697,000 +$128,027,062 -$88,050,579 +$39,976,483 ENS, ATSG, PWR, BBCP, DY Restatement 13 Nov 2019, 12:33
Q2 2019 26 $269,809,000 +$159,207,991 -$145,790,454 +$13,417,537 BBCP, ENS, USCR, BMCH, BLD 13F-HR 14 Aug 2019, 11:26
Q1 2019 30 $309,211,010 +$134,861,554 -$75,624,914 +$59,236,640 ATRO, ROG, WMS, PWR, SAIC 13F-HR 13 May 2019, 16:09
Q4 2018 29 $292,208,215 +$82,135,083 -$96,677,893 -$14,542,810 ATRO, DY, ATSG, ENS, WMS 13F-HR 12 Feb 2019, 13:29
Q3 2018 26 $363,960,000 +$42,176,389 -$71,150,424 -$28,974,035 ATRO, ENS, WMS, ROG, DY 13F-HR 09 Nov 2018, 15:00
Q2 2018 32 $289,307,000 +$86,069,089 -$56,350,027 +$29,719,062 ATRO, ENS, ROG, PLYA, ATSG 13F-HR 13 Aug 2018, 11:13
Q1 2018 28 $397,457,000 +$101,204,670 -$147,497,409 -$46,292,739 WMS, DY, ATRO, ENS, MCRN 13F-HR 14 May 2018, 14:31
Q4 2017 32 $445,362,000 +$169,337,023 -$124,096,448 +$45,240,575 DY, ATRO, WMS, MCRN, GWR 13F-HR 12 Feb 2018, 15:08
Q3 2017 30 $362,190,000 +$92,367,194 -$186,864,027 -$94,496,833 DY, EXP, ATRO, KW, ROG 13F-HR 13 Nov 2017, 11:00
Q2 2017 33 $443,172,000 +$128,598,814 -$58,621,270 +$69,977,544 DY, ROG, USCR, WMS, KW 13F-HR 14 Aug 2017, 13:21
Q1 2017 27 $285,725,000 +$147,483,746 -$119,051,040 +$28,432,706 WMS, ROG, GWR, VMI, KW 13F-HR 12 May 2017, 10:22
Q4 2016 30 $339,994,000 +$121,538,044 -$133,908,340 -$12,370,296 DY, MRCY, LDOS, BMCH, WMS 13F-HR 13 Feb 2017, 11:54
Q3 2016 31 $329,908,000 +$89,230,285 -$102,946,075 -$13,715,790 DY, MRCY, WMS, BMCH, ROG 13F-HR 10 Nov 2016, 16:54
Q2 2016 27 $336,452,000 +$110,069,346 -$58,019,839 +$52,049,507 DY, WMS, MRCY, EXP, BMCH 13F-HR 15 Aug 2016, 12:35
Q1 2016 26 $254,148,000 +$125,685,983 -$67,877,325 +$57,808,658 EXP, DY, MRCY, WAGE, WMS 13F-HR 13 May 2016, 17:34
Q4 2015 23 $195,138,000 +$68,582,965 -$110,736,921 -$42,153,956 USCR, MRCY, CSU, DY, WAGE 13F-HR 11 Feb 2016, 15:10
Q3 2015 22 $238,895,000 +$62,526,952 -$170,213,690 -$107,686,738 USCR, BKD, DY, LBYYQ, MRCY 13F-HR 13 Nov 2015, 18:46
Q2 2015 32 $357,749,000 +$119,151,069 -$87,780,389 +$31,370,680 DY, USCR, LBYYQ, CLH, PWR 13F-HR 11 Aug 2015, 16:26
Q1 2015 35 $316,603,000 +$127,586,967 -$119,003,958 +$8,583,009 LBYYQ, WMS, DY, CLH, USCR 13F-HR 14 May 2015, 16:36
Q4 2014 34 $277,399,000 +$59,714,563 -$90,197,497 -$30,482,934 LBYYQ, BKD, DY, WMS, USCR 13F-HR 12 Feb 2015, 16:36
Q3 2014 29 $278,377,000 +$63,856,285 -$100,575,815 -$36,719,530 DY, LBYYQ, BKD, ROG, USCR 13F-HR 14 Nov 2014, 12:57
Q2 2014 31 $332,746,000 +$80,327,799 -$43,453,263 +$36,874,536 ROG, DY, LBYYQ, BKD, USCR 13F-HR 04 Aug 2014, 17:07
Q1 2014 31 $298,731,000 +$95,170,471 -$114,202,351 -$19,031,880 DY, ROG, LBYYQ, BKD, TRIB 13F-HR 09 May 2014, 10:05
Q4 2013 34 $303,177,000 $0 $0 $0 ROG, BKD, LBYYQ, DY, ATRO 13F-HR 11 Feb 2014, 09:56