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ACK Asset Management LLC

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13F filer, CIK 1510940, GREENWICH, CT

ACK Asset Management LLC reported $746,424,192 across 22 holdings for the quarter ended 2024-12-31, in a 13F-HR filed 2025-02-13. Its ten largest share positions make up 72.01% of the portfolio.

Filed (acceptance time not in the bulk data set), ingested 13F-HR 0000899140-25-000241

Period
2024-12-31
Reported value
$746M
Holdings
22
Top 10 weight
72.01%
New
7
Sold out
3

Largest buys vs the previous quarter

SecurityShares changeApprox. value
JBTMnew+400,000$50.8M
MYRGnew+200,000$29.8M
CTRInew+1,300,000$25.1M
APTVnew+240,000$14.5M
MBCadded+825,000$12.1M

Ranked by the share change valued at this quarter's implied price (value over shares in the 13F). A position sold out is valued at the previous quarter's price, its last report.

Largest sells vs the previous quarter

SecurityShares changeApprox. value
GVAreduced-541,000-$47.5M
MIRreduced-2,431,300-$42.4M
MTZreduced-240,500-$32.7M
ESIreduced-1,240,000-$31.5M
PRIMexited-390,000-$22.7M

Ranked by the share change valued at this quarter's implied price (value over shares in the 13F). A position sold out is valued at the previous quarter's price, its last report.

Holdings, Q4 2024

Share positions as resolved from 13F-HR 0000899140-25-000241, largest first. % of portfolio is the value over $746,424,192, the sum of the share positions whose value is usable for ratios (method).

SecurityHistorySharesValue% of portfolioChangeLatest eventTimeline
DYDYCOM INDS INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2023Q1: restricted; 2023Q2: restricted; 2023Q3: restricted; 2023Q4: restricted; 2024Q1: restricted; 2024Q2: restricted; 2024Q3: 535,500 shares; 2024Q4: 445,500 shares 445,500$77.5M10.39%-90,000Timeline
MTZMASTEC INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2023Q1: restricted; 2023Q2: restricted; 2023Q3: restricted; 2023Q4: restricted; 2024Q1: restricted; 2024Q2: restricted; 2024Q3: 772,300 shares; 2024Q4: 531,800 shares 531,800$72.4M9.7%-240,500Timeline
ATSATS CORPORATIONQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2023Q1: restricted; 2023Q2: restricted; 2023Q3: restricted; 2023Q4: restricted; 2024Q1: restricted; 2024Q2: restricted; 2024Q3: 2,255,889 shares; 2024Q4: 2,093,196 shares 2,093,196$63.8M8.55%-162,693Timeline
ENSENERSYSQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2023Q1: restricted; 2023Q2: restricted; 2023Q3: restricted; 2023Q4: restricted; 2024Q1: restricted; 2024Q2: restricted; 2024Q3: 715,000 shares; 2024Q4: 671,024 shares 671,024$62M8.31%-43,976Timeline
ROGROGERS CORPQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2023Q1: restricted; 2023Q2: restricted; 2023Q3: restricted; 2023Q4: restricted; 2024Q1: restricted; 2024Q2: restricted; 2024Q3: 590,000 shares; 2024Q4: 580,000 shares 580,000$58.9M7.9%-10,000Timeline
JBTMJBT MAREL CORPORATIONQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2023Q1: restricted; 2023Q2: restricted; 2023Q3: restricted; 2023Q4: restricted; 2024Q1: restricted; 2024Q2: restricted; 2024Q3: not reported; 2024Q4: 400,000 shares 400,000$50.8M6.81%newTimeline
MTRNMATERION CORPQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2023Q1: restricted; 2023Q2: restricted; 2023Q3: restricted; 2023Q4: restricted; 2024Q1: restricted; 2024Q2: restricted; 2024Q3: 505,500 shares; 2024Q4: 494,800 shares 494,800$48.9M6.55%-10,700Timeline
CECOCECO ENVIRONMENTAL CORPQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2023Q1: restricted; 2023Q2: restricted; 2023Q3: restricted; 2023Q4: restricted; 2024Q1: restricted; 2024Q2: restricted; 2024Q3: 981,200 shares; 2024Q4: 1,272,000 shares 1,272,000$38.5M5.15%+290,800Timeline
ATROASTRONICS CORPQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2023Q1: restricted; 2023Q2: restricted; 2023Q3: restricted; 2023Q4: restricted; 2024Q1: restricted; 2024Q2: restricted; 2024Q3: 2,060,000 shares; 2024Q4: 2,060,000 shares 2,060,000$32.9M4.4%0Timeline
MIRMIRION TECHNOLOGIES INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2023Q1: restricted; 2023Q2: restricted; 2023Q3: restricted; 2023Q4: restricted; 2024Q1: restricted; 2024Q2: restricted; 2024Q3: 4,246,300 shares; 2024Q4: 1,815,000 shares 1,815,000$31.7M4.24%-2,431,300Timeline
MYRGMYR GROUP INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2023Q1: restricted; 2023Q2: restricted; 2023Q3: restricted; 2023Q4: restricted; 2024Q1: restricted; 2024Q2: restricted; 2024Q3: not reported; 2024Q4: 200,000 shares 200,000$29.8M3.99%newTimeline
CTRICENTURI HOLDINGS INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2023Q1: restricted; 2023Q2: restricted; 2023Q3: restricted; 2023Q4: restricted; 2024Q1: restricted; 2024Q2: restricted; 2024Q3: not reported; 2024Q4: 1,300,000 shares 1,300,000$25.1M3.36%newTimeline
GVAGRANITE CONSTR INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2023Q1: restricted; 2023Q2: restricted; 2023Q3: restricted; 2023Q4: restricted; 2024Q1: restricted; 2024Q2: restricted; 2024Q3: 825,000 shares; 2024Q4: 284,000 shares 284,000$24.9M3.34%-541,000Timeline
CLFDCLEARFIELD INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2023Q1: restricted; 2023Q2: restricted; 2023Q3: restricted; 2023Q4: restricted; 2024Q1: restricted; 2024Q2: restricted; 2024Q3: 695,000 shares; 2024Q4: 720,000 shares 720,000$22.3M2.99%+25,000Timeline
MBCMASTERBRAND INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2023Q1: restricted; 2023Q2: restricted; 2023Q3: restricted; 2023Q4: restricted; 2024Q1: restricted; 2024Q2: restricted; 2024Q3: 650,000 shares; 2024Q4: 1,475,000 shares 1,475,000$21.5M2.89%+825,000Timeline
ESIELEMENT SOLUTIONS INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2023Q1: restricted; 2023Q2: restricted; 2023Q3: restricted; 2023Q4: restricted; 2024Q1: restricted; 2024Q2: restricted; 2024Q3: 1,990,000 shares; 2024Q4: 750,000 shares 750,000$19.1M2.56%-1,240,000Timeline
NEOGNEOGEN CORPQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2023Q1: restricted; 2023Q2: restricted; 2023Q3: restricted; 2023Q4: restricted; 2024Q1: restricted; 2024Q2: restricted; 2024Q3: 1,659,400 shares; 2024Q4: 1,206,796 shares 1,206,796$14.7M1.96%-452,604Timeline
APTVAPTIV PLCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2023Q1: restricted; 2023Q2: restricted; 2023Q3: restricted; 2023Q4: restricted; 2024Q1: restricted; 2024Q2: restricted; 2024Q3: not reported; 2024Q4: 240,000 shares 240,000$14.5M1.94%newTimeline
MTRXMATRIX SVC COQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2023Q1: restricted; 2023Q2: restricted; 2023Q3: restricted; 2023Q4: restricted; 2024Q1: restricted; 2024Q2: restricted; 2024Q3: 801,000 shares; 2024Q4: 1,179,901 shares 1,179,901$14.1M1.89%+378,901Timeline
BWABORGWARNER INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2023Q1: restricted; 2023Q2: restricted; 2023Q3: restricted; 2023Q4: restricted; 2024Q1: restricted; 2024Q2: restricted; 2024Q3: not reported; 2024Q4: 351,400 shares 351,400$11.2M1.5%newTimeline
MRC GLOBAL INCMRC GLOBAL INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2023Q1: restricted; 2023Q2: restricted; 2023Q3: restricted; 2023Q4: restricted; 2024Q1: restricted; 2024Q2: restricted; 2024Q3: not reported; 2024Q4: 550,000 shares 550,000$7.03M0.94%new
TRNSTRANSCAT INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2023Q1: restricted; 2023Q2: restricted; 2023Q3: restricted; 2023Q4: restricted; 2024Q1: restricted; 2024Q2: restricted; 2024Q3: not reported; 2024Q4: 45,000 shares 45,000$4.76M0.64%newTimeline

Sold out in Q4 2024

Positions in the previous quarter's report that this quarter's report no longer lists.

SecurityShares beforeValue beforeType
PRIMPRIMORIS SVCS CORP390,000$22.7Mshares
CALXCALIX INC321,124$12.5Mshares
LUNALUNA INNOVATIONS INC COM STK525,000$1.23Mshares

How Q4 2024 was built

Available 13F filings of this filer for the quarter and their roles: the base report is the latest original or restatement, NEW HOLDINGS amendments filed after it are added (method).

FilingRoleAmendmentFiledAcceptedIngested
13F-HR 0000899140-25-000241 base2025-02-13acceptance time not in the bulk data set