ACK Asset Management LLC Quant / Systematic

Location: Greenwich, CT

CIK: 0001510940 · Show all filings

Period: Q2 2026 (← Previous)

Filing Date: Aug 13, 2026

Total Value: $856M (100.0% shares, 0.0% debt)

Holdings (21)

New Positions (7)

Value $54.34M Shares 1,500,000 Est. Cost $36.23 Unrealized —

Value $39.84M Shares 600,000 Est. Cost $66.40 Unrealized —

Value $38.91M Shares 3,000,000 Est. Cost $12.97 Unrealized —

Value $28.64M Shares 600,000 Est. Cost $47.74 Unrealized —

Value $22.32M Shares 2,255,000 Est. Cost $9.90 Unrealized —

Value $20.93M Shares 1,064,830 Est. Cost $19.66 Unrealized —

Value $16.65M Shares 877,500 Est. Cost $18.97 Unrealized —

Ticker	Issuer	Shares	Value	%	Est. Cost	Unrealized	Class	CUSIP
GTX	GTX	1,500,000	$54.34M	6.3%	$36.23	—	COM	366505105
BWA	BWA	600,000	$39.84M	4.7%	$66.40	—	COM	099724106
DNOW	DNOW	3,000,000	$38.91M	4.5%	$12.97	—	COM	67011P100
ST	ST	600,000	$28.64M	3.3%	$47.74	—	COM	G8060N102
SHLS	SHLS	2,255,000	$22.32M	2.6%	$9.90	—	COM	82489W107
EQPT	EQPT	1,064,830	$20.93M	2.4%	$19.66	—	COM	29445S100
MEI	MEI	877,500	$16.65M	1.9%	$18.97	—	COM	591520200

Increased Positions (5)

Value $49.5M (+58.4%) Shares 220,000 (+33.3%) Est. Cost $223.97 Unrealized —

Value $32.24M (+65.7%) Shares 810,200 (+10.2%) Est. Cost $29.41 Unrealized —

Value $36.62M (+32.2%) Shares 5,660,000 (+9.7%) Est. Cost $6.58 Unrealized —

Value $52.59M (+18.3%) Shares 1,090,000 (+21.1%) Est. Cost $58.42 Unrealized —

MTASF AERO-SWX 3.3%

Value $28.46M (+6.2%) Shares 1,082,500 (+30.4%) Est. Cost $36.30 Unrealized —

Ticker	Issuer	Shares	Value	%	Est. Cost	Unrealized	Class	CUSIP
EXP	EXP	220,000 (+33.3%)	$49.5M (+58.4%)	5.8%	$223.97	—	COM	26969P108
CLFD	CLFD	810,200 (+10.2%)	$32.24M (+65.7%)	3.8%	$29.41	—	COM	18482P103
SWIM	SWIM	5,660,000 (+9.7%)	$36.62M (+32.2%)	4.3%	$6.58	—	COM	51819L107
CNM	CNM	1,090,000 (+21.1%)	$52.59M (+18.3%)	6.1%	$58.42	—	COM	21874C102
MTASF	AERO-SWX	1,082,500 (+30.4%)	$28.46M (+6.2%)	3.3%	$36.30	—	COM	H55555108

Exited Positions (6)

Value $50.98M Shares 475,000 Est. Cost $87.12 Unrealized —

Value $44.29M Shares 375,000 Est. Cost $113.88 Unrealized —

Value $36.33M Shares 260,000 Est. Cost $110.80 Unrealized —

Value $34.66M Shares 874,000 Est. Cost $24.75 Unrealized —

Value $29.97M Shares 250,000 Est. Cost $75.50 Unrealized —

Value $27.89M Shares 584,000 Est. Cost $51.18 Unrealized —

Ticker	Issuer	Shares	Value	%	Est. Cost	Unrealized	Class	CUSIP
ROG	ROG	475,000	$50.98M	6.0%	$87.12	—	—	775133101
NOVT	NOVT	375,000	$44.29M	5.2%	$113.88	—	—	67000B104
DXPE	DXPE	260,000	$36.33M	4.2%	$110.80	—	—	233377407
CDNL	CDNL	874,000	$34.66M	4.0%	$24.75	—	—	14154A102
GVA	GVA	250,000	$29.97M	3.5%	$75.50	—	—	387328107
CTS	CTS	584,000	$27.89M	3.3%	$51.18	—	—	126501105

Decreased Positions (5)

Value $40.15M (-41.5%) Shares 135,000 (-71.6%) Est. Cost $71.33 Unrealized —

Value $56.92M (+24.2%) Shares 125,000 (-7.4%) Est. Cost $319.97 Unrealized —

Value $60.78M (+20.4%) Shares 681,000 (-12.7%) Est. Cost $46.79 Unrealized —

Value $43.17M (-17.1%) Shares 1,500,000 (-18.8%) Est. Cost $33.78 Unrealized —

Value $42.24M (-0.3%) Shares 690,276 (-12.2%) Est. Cost $43.76 Unrealized —

Ticker	Issuer	Shares	Value	%	Est. Cost	Unrealized	Class	CUSIP
MTRN	MTRN	135,000 (-71.6%)	$40.15M (-41.5%)	4.7%	$71.33	—	COM	576690101
LFUS	LFUS	125,000 (-7.4%)	$56.92M (+24.2%)	6.6%	$319.97	—	COM	537008104
HLIO	HLIO	681,000 (-12.7%)	$60.78M (+20.4%)	7.1%	$46.79	—	COM	42328H109
ATS	ATS	1,500,000 (-18.8%)	$43.17M (-17.1%)	5.0%	$33.78	—	COM	00217Y104
ASTE	ASTE	690,276 (-12.2%)	$42.24M (-0.3%)	4.9%	$43.76	—	COM	046224101

Unchanged Positions (4)

Value $54.98M Shares 2,100,000 Est. Cost $23.95 Unrealized —

Value $61.21M Shares 390,000 Est. Cost $113.87 Unrealized —

Value $38.07M Shares 3,700,000 Est. Cost $12.28 Unrealized —

Value $37.76M Shares 330,000 Est. Cost $125.42 Unrealized —

Ticker	Issuer	Shares	Value	%	Est. Cost	Unrealized	Class	CUSIP
JHX	JHX	2,100,000	$54.98M	6.4%	$23.95	—	COM	G4253H101
WMS	WMS	390,000	$61.21M	7.1%	$113.87	—	COM	00790R104
MBC	MBC	3,700,000	$38.07M	4.4%	$12.28	—	COM	57638P104
SITE	SITE	330,000	$37.76M	4.4%	$125.42	—	COM	82982L103