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ACK Asset Management LLC

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13F filer, CIK 1510940, GREENWICH, CT

ACK Asset Management LLC reported $809,196,810 across 18 holdings for the quarter ended 2024-09-30, in a 13F-HR filed 2024-11-13. Its ten largest share positions make up 82.67% of the portfolio.

Filed (acceptance time not in the bulk data set), ingested 13F-HR 0000899140-24-001197

Period
2024-09-30
Reported value
$809M
Holdings
18
Top 10 weight
82.67%
New
4
Sold out
5

Largest buys vs the previous quarter

SecurityShares changeApprox. value
PRIMnew+390,000$22.7M
ESIadded+490,000$13.3M
CALXnew+321,124$12.5M
MBCnew+650,000$12.1M
MIRadded+948,720$10.5M

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
CNMexited-1,352,000-$66.2M
ARRYexited-4,282,000-$43.9M
FIPexited-1,025,000-$8.85M
THRYexited-245,000-$4.37M
MDAexited-211,600-$2.12M

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, Q3 2024

Share positions as resolved from 13F-HR 0000899140-24-001197, largest first. % of portfolio is the value over $809,196,810, 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; 2022Q4: restricted; 2023Q1: restricted; 2023Q2: restricted; 2023Q3: restricted; 2023Q4: restricted; 2024Q1: restricted; 2024Q2: restricted; 2024Q3: 535,500 shares 535,500$106M13.04%0Timeline
MTZMASTEC INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2022Q4: restricted; 2023Q1: restricted; 2023Q2: restricted; 2023Q3: restricted; 2023Q4: restricted; 2024Q1: restricted; 2024Q2: restricted; 2024Q3: 772,300 shares 772,300$95.1M11.75%0Timeline
ENSENERSYSQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2022Q4: restricted; 2023Q1: restricted; 2023Q2: restricted; 2023Q3: restricted; 2023Q4: restricted; 2024Q1: restricted; 2024Q2: restricted; 2024Q3: 715,000 shares 715,000$73M9.02%0Timeline
ROGROGERS CORPQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2022Q4: restricted; 2023Q1: restricted; 2023Q2: restricted; 2023Q3: restricted; 2023Q4: restricted; 2024Q1: restricted; 2024Q2: restricted; 2024Q3: 590,000 shares 590,000$66.7M8.24%0Timeline
ATSATS CORPORATIONQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2022Q4: restricted; 2023Q1: restricted; 2023Q2: restricted; 2023Q3: restricted; 2023Q4: restricted; 2024Q1: restricted; 2024Q2: restricted; 2024Q3: 2,255,889 shares 2,255,889$65.5M8.1%+255,889Timeline
GVAGRANITE CONSTR INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2022Q4: restricted; 2023Q1: restricted; 2023Q2: restricted; 2023Q3: restricted; 2023Q4: restricted; 2024Q1: restricted; 2024Q2: restricted; 2024Q3: 825,000 shares 825,000$65.4M8.08%0Timeline
MTRNMATERION CORPQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2022Q4: restricted; 2023Q1: restricted; 2023Q2: restricted; 2023Q3: restricted; 2023Q4: restricted; 2024Q1: restricted; 2024Q2: restricted; 2024Q3: 505,500 shares 505,500$56.5M6.99%0Timeline
ESIELEMENT SOLUTIONS INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2022Q4: restricted; 2023Q1: restricted; 2023Q2: restricted; 2023Q3: restricted; 2023Q4: restricted; 2024Q1: restricted; 2024Q2: restricted; 2024Q3: 1,990,000 shares 1,990,000$54M6.68%+490,000Timeline
MIRMIRION TECHNOLOGIES INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2022Q4: restricted; 2023Q1: restricted; 2023Q2: restricted; 2023Q3: restricted; 2023Q4: restricted; 2024Q1: restricted; 2024Q2: restricted; 2024Q3: 4,246,300 shares 4,246,300$47M5.81%+948,720Timeline
ATROASTRONICS CORPQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2022Q4: restricted; 2023Q1: restricted; 2023Q2: restricted; 2023Q3: restricted; 2023Q4: restricted; 2024Q1: restricted; 2024Q2: restricted; 2024Q3: 2,060,000 shares 2,060,000$40.1M4.96%0Timeline
NEOGNEOGEN CORPQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2022Q4: restricted; 2023Q1: restricted; 2023Q2: restricted; 2023Q3: restricted; 2023Q4: restricted; 2024Q1: restricted; 2024Q2: restricted; 2024Q3: 1,659,400 shares 1,659,400$27.9M3.45%0Timeline
CECOCECO ENVIRONMENTAL CORPQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2022Q4: restricted; 2023Q1: restricted; 2023Q2: restricted; 2023Q3: restricted; 2023Q4: restricted; 2024Q1: restricted; 2024Q2: restricted; 2024Q3: 981,200 shares 981,200$27.7M3.42%+160,000Timeline
CLFDCLEARFIELD INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2022Q4: restricted; 2023Q1: restricted; 2023Q2: restricted; 2023Q3: restricted; 2023Q4: restricted; 2024Q1: restricted; 2024Q2: restricted; 2024Q3: 695,000 shares 695,000$27.1M3.35%0Timeline
PRIMPRIMORIS SVCS CORPQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2022Q4: restricted; 2023Q1: restricted; 2023Q2: restricted; 2023Q3: restricted; 2023Q4: restricted; 2024Q1: restricted; 2024Q2: restricted; 2024Q3: 390,000 shares 390,000$22.7M2.8%newTimeline
CALXCALIX INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2022Q4: restricted; 2023Q1: restricted; 2023Q2: restricted; 2023Q3: restricted; 2023Q4: restricted; 2024Q1: restricted; 2024Q2: restricted; 2024Q3: 321,124 shares 321,124$12.5M1.54%newTimeline
MBCMASTERBRAND INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2022Q4: restricted; 2023Q1: restricted; 2023Q2: restricted; 2023Q3: restricted; 2023Q4: restricted; 2024Q1: restricted; 2024Q2: restricted; 2024Q3: 650,000 shares 650,000$12.1M1.49%newTimeline
MTRXMATRIX SVC COQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2022Q4: restricted; 2023Q1: restricted; 2023Q2: restricted; 2023Q3: restricted; 2023Q4: restricted; 2024Q1: restricted; 2024Q2: restricted; 2024Q3: 801,000 shares 801,000$9.24M1.14%newTimeline
LUNALUNA INNOVATIONS INC COM STKQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2022Q4: restricted; 2023Q1: restricted; 2023Q2: restricted; 2023Q3: restricted; 2023Q4: restricted; 2024Q1: restricted; 2024Q2: restricted; 2024Q3: 525,000 shares 525,000$1.23M0.15%-254,000Timeline

Sold out in Q3 2024

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

SecurityShares beforeValue beforeType
CNMCORE & MAIN INC1,352,000$66.2Mshares
ARRYARRAY TECHNOLOGIES INC4,282,000$43.9Mshares
FIPFTAI INFRASTRUCTURE INC1,025,000$8.85Mshares
THRYTHRYV HLDGS INC245,000$4.37Mshares
MDAMDA SPACE LTD211,600$2.12Mshares

How Q3 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 0000899140-24-001197 base2024-11-13acceptance time not in the bulk data set