ACK Asset Management LLC

CIK 0001510940 · Q1 2026

13F Equity AUM

$801.1M

+0.6% QoQ

Positions

-3 QoQ

AUM Rank

#3,235

Top 26%

Skill Alpha (FF)

+0.8%/yr^ns

No Clear Edge

Rank #1,744 · Top 21%

vs S&P +1.7%/yr (unadj.)

Quarters Tracked

~13 years

Portfolio Concentration

Top 5: 34.4%Top 10: 62.0%Top 20: 100.0%

MTRN8.6%

WMS6.7%

ATS6.5%

RG66.4%

HLIO6.3%

LFUS5.7%

CNM5.5%

1GSN5.5%

SITE5.5%

ASTE5.3%

Others (10)38.0%

HHI (Herfindahl-Hirschman Index) measures portfolio concentration. Low (<1500) = diversified, Moderate (1500-2500), High (>2500) = concentrated bets.

Sector Allocation

Industrials51.9%

Basic Materials18.8%

Technology17.2%

Unclassified8.3%

Consumer Cyclical3.8%

Portfolio weight by GICS sector based on latest 13F filing. Sectors below 2% are grouped as “Other.”

Position Sizing

Positions: 20Median: 5.13%Avg: 5.00%

0–0.5%

0(0.0%)

0.5–1%

0(0.0%)

1–3%

1(2.4%)

3–5%

9(35.6%)

5%+

10(62.0%)

Count of positions per weight bucket — (%) = combined portfolio weight

Loading summary cards...

Portfolio Overlap

Shared: 19Unique: 1vs 20 funds

0.3%Low

Fund positions

7,299

Consensus CUSIPs

Jaccard similarity of this fund’s portfolio vs the consensus of top 20 funds by AUM. Low (<15%) = contrarian, Moderate (15-40%), High (>40%) = follows the crowd.

Most Similar Funds

Top 9 benchmark funds with highest portfolio overlap (Jaccard similarity)

GEODE CAPITAL MANAGEMENT, LLC

0.6%

BlackRock, Inc.

0.5%

VANGUARD CAPITAL MANAGEMENT LLC

0.5%

STATE STREET CORP

0.5%

VANGUARD PORTFOLIO MANAGEMENT LLC

0.6%

FMR LLC

0.6%

MORGAN STANLEY

0.3%

BANK OF AMERICA CORP /DE/

0.4%

JPMORGAN CHASE & CO

0.3%

Jaccard similarity per fund: shared CUSIPs / (fund A + fund B − shared). Higher values indicate more similar portfolios.

Loading overlap analysis...

Position Changes This Quarter

New3Increased6Decreased1Exited6

New Positions

LFUS5.7%

+135K

CTS3.5%

+584K

SWIM3.5%

+5.2M

Increased

MBC3.8%

+1.4M(+61%)

AERO-SWX3.4%

+675K(+436%)

CLFD2.4%

+110K(+18%)

RG66.4%

+38K(+9%)

CDNL4.3%

+29K(+3%)

DXPE4.5%

+20K(+8%)

Decreased

GVA3.7%

-250,000(-50%)

Exited

-304,324

-597,469

-600,000

-813,000

-677,251

-800,136

Quarter-over-quarter changes compared to prior 13F filing. New = first appearance; Exited = no longer held.

Loading position changes...

Holdings

Loading holdings...