What does ACK Asset Management LLC hold?

ACK Asset Management LLC's largest disclosed positions on the most recent Form 13F-HR filing on SEC EDGAR include MTRN, WMS, ATS. Full top-holdings list, quarter-over-quarter position changes, and sector allocation breakdown are available at https://13fpro.ai/research/fund/1510940.

What is ACK Asset Management LLC's AUM?

ACK Asset Management LLC reported approximately $801.1M in 13F-reportable AUM as of 2026-03-31. This figure reflects long US-listed positions disclosed on Form 13F-HR and excludes non-13F-reportable holdings (cash, short positions, certain derivatives, and non-US securities). Separately, the firm reported $1.1B in total regulatory AUM (RAUM) on its most recent Form ADV filing.

Where does 13F Pro source ACK Asset Management LLC's holdings?

All ACK Asset Management LLC holdings data comes directly from SEC EDGAR Form 13F-HR filings under CIK 1510940. Data refreshes automatically each quarter as new 13F filings are submitted (typically within 45 days of quarter-end). 13F Pro applies no third-party rewrites or estimates.

How often is ACK Asset Management LLC's 13F data updated on 13F Pro?

ACK Asset Management LLC's holdings update on 13F Pro within hours of each new Form 13F-HR filing on SEC EDGAR. Quarterly position changes, accumulation/distribution flags, and sector allocation are recalculated on each refresh.

ACK Asset Management LLC

Institutional InvestorSimilar funds →SEC EDGAR: CIK 1510940

Institutional-grade research for retail investors

13F Reported Value

ⓘ

$801.1M

Holdings

Latest Filing

2026-03-31

Filing Quarter

Q1 2026

Portfolio Overview

ACK Asset Management LLC disclosed 20 positions worth $801.1M in its Form 13F-HR for Q1 2026, led by $MTRN (MATERION Corp) at 8.6% of the equity portfolio, followed by $WMS and $ATS. During the quarter the fund opened 3 new positions and exited 6 — including a new stake in $LFUS and a full exit from $ENS. The portfolio is most concentrated in Industrials (34.7% of disclosed assets). All figures are sourced directly from ACK Asset Management LLC’s Form 13F-HR filing with the SEC under CIK 1510940.

AI Fund Analysis

Stable

2 quarters accumulating

Sector Allocation

IndustrialsMaterialsConsumer DiscretionaryTechnologyOther

AUM History

Top Equity Holdings by Value

Quarterly Activity — Q1 2026

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Top Holdings

AI Quality Scored

MATERION Corp
$MTRN
53.4#1,285
Quality
$68.7M474,800 sh
ADVANCED DRAINAGE SYSTEMS, INC.
$WMS
58.0#1,011
Quality
$53.5M390,000 sh
ATS Corp /ATS
$ATS
—
Quality
$52.1M1,846,196 sh
ROGERS CORP
$ROG
29.3
Quality
$51.0M475,000 sh
HELIOS TECHNOLOGIES, INC.
$HLIO
52.0
Quality
$50.5M780,378 sh
LITTELFUSE INC /DE
$LFUS
58.7
Quality
$45.8M135,000 sh
Core & Main, Inc.
$CNM
63.4
Quality
$44.5M900,000 sh
NOVANTA INC
$NOVT
50.5
Quality
$44.3M375,000 sh
SiteOne Landscape Supply, Inc.
$SITE
47.0
Quality
$43.9M330,000 sh
ASTEC INDUSTRIES INC
$ASTE
51.4
Quality
$42.3M786,500 sh

Company	Quality	Value	Shares
MATERION Corp$MTRN	53.4#1,285	$68.7M	474,800
ADVANCED DRAINAGE SYSTEMS, INC.$WMS	58.0#1,011	$53.5M	390,000
ATS Corp /ATS$ATS	—	$52.1M	1,846,196
ROGERS CORP$ROG	29.3	$51.0M	475,000
HELIOS TECHNOLOGIES, INC.$HLIO	52.0	$50.5M	780,378
LITTELFUSE INC /DE$LFUS	58.7	$45.8M	135,000
Core & Main, Inc.$CNM	63.4	$44.5M	900,000
NOVANTA INC$NOVT	50.5	$44.3M	375,000
SiteOne Landscape Supply, Inc.$SITE	47.0	$43.9M	330,000
ASTEC INDUSTRIES INC$ASTE	51.4	$42.3M	786,500

Unlock AI quality scores for every holding

32-signal composite ranking on each of ACK Asset Management LLC's 20 positions.

Showing top 10 of 20 holdings.

Sector Allocation

Industrials

$278.2M

Materials

$203.2M

Consumer Discretionary

$155.5M

Technology

$137.5M

Other

$26.8M

Full Holdings — ACK Asset Management LLC (Q1 2026)

All 20 disclosed positions from the latest Form 13F-HR, with quarter-over-quarter share changes and 13F Pro quality scores. Sourced from SEC EDGAR.

#	Ticker	Company	Value	Weight	QoQ	Quality
1	$MTRN	MATERION Corp	$68.7M	8.6%	+0%	53.4
2	$WMS	ADVANCED DRAINAGE SYSTEMS, INC.	$53.5M	6.7%	+0%	58
3	$ATS	ATS Corp /ATS	$52.1M	6.5%	+0%	—
4	$ROG	ROGERS CORP	$51.0M	6.4%	+9%	29.3
5	$HLIO	HELIOS TECHNOLOGIES, INC.	$50.5M	6.3%	+0%	52
6	$LFUS	LITTELFUSE INC /DE	$45.8M	5.7%	NEW	58.7
7	$CNM	Core & Main, Inc.	$44.5M	5.5%	+0%	63.4
8	$NOVT	NOVANTA INC	$44.3M	5.5%	+0%	50.5
9	$SITE	SiteOne Landscape Supply, Inc.	$43.9M	5.5%	+0%	47
10	$ASTE	ASTEC INDUSTRIES INC	$42.3M	5.3%	+0%	51.4
11	$JHX	James Hardie Industries plc	$39.8M	5.0%	+0%	—
12	$DXPE	DXP ENTERPRISES INC	$36.3M	4.5%	+8%	57.7
13	$CDNL	Cardinal Infrastructure Group Inc.	$34.7M	4.3%	+3%	—
14	$EXP	EAGLE MATERIALS INC	$31.3M	3.9%	+0%	62.7
15	$MBC	MasterBrand, Inc.	$30.7M	3.8%	+61%	41.5
16	$GVA	GRANITE CONSTRUCTION INC	$30.0M	3.7%	-50%	56.9
17	$CTS	CTS CORP	$27.9M	3.5%	NEW	58.6
18	$SWIM	Latham Group, Inc.	$27.7M	3.5%	NEW	47.7
19	—	AERO-SWX	$26.8M	3.4%	+436%	—
20	$CLFD	Clearfield, Inc.	$19.5M	2.4%	+18%	43.8

New Positions (3)

$LFUS LITTELFUSE INC /DE$45.8M

$CTS CTS CORP$27.9M

$SWIM Latham Group, Inc.$27.7M

Exited Positions (6)

$ENS EnerSys

$ATRO ASTRONICS CORP

$AIN ALBANY INTERNATIONAL CORP /DE/

$APOG APOGEE ENTERPRISES, INC.

$ERII Energy Recovery, Inc.

$CTOS Custom Truck One Source, Inc.

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Available Analysis

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Accumulation & distribution patterns

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AI-Powered Hedge Fund Analysis: ACK Asset Management LLC

13F Pro is an AI hedge fund tracker and stock research platform. For ACK Asset Management LLC (SEC CIK: 1510940), the platform ingests every quarterly Form 13F filing and applies AI-powered analysis on top — 10 specialized AI analysts (value, growth, momentum, macro, activist, and more) debate the fund's top positions and publish AI-generated analysis with cited SEC sources.

Every holding in ACK Asset Management LLC's portfolio is scored on a 32-signal AI quality ranking (ROIC, FCF margin, revenue growth, institutional flow, earnings quality, shareholder dilution, and more). Track accumulation and distribution quarter over quarter, identify conviction positions, and see AI stock analysis for each position — alongside 8,700+ other institutional filers and 2,800+ AI-ranked companies.