1y return+68.8%S&P 500 +20.9%
3y return+76.2%S&P 500 +68.5%
5y return+111.9%S&P 500 +74.5%
These returns are for its stock picks as disclosed on Form 13F: last quarter's holdings, valued at this quarter's prices. They miss trades within each quarter, short positions, options, bonds, cash and fees, so they aren't the returns its clients got.
$100 invested in its stock picks
Since June 30, 2019: $376 against $255 in the S&P 500.2
ACK Asset Management LLCS&P 500 (SPY)
Top holdings
At the end of June 30, 2026. Change is in shares since the quarter before.2
| Stock | Value | Share of portfolio | Change |
|---|---|---|---|
| WMSWms | $61.2M | 7.1% | |
| HLIOHlio | $60.8M | 7.1% | −12.7% |
| LFUSLfus | $56.9M | 6.6% | −7.4% |
| JhxCUSIP G4253H101 | $55.0M | 6.4% | |
| GTXGtx | $54.3M | 6.3% | New |
| CNMCnm | $52.6M | 6.1% | +21.1% |
| EXPExp | $49.5M | 5.8% | +33.3% |
| ATSAts | $43.2M | 5.0% | −18.8% |
| ASTEAste | $42.2M | 4.9% | −12.2% |
| MTRNMtrn | $40.1M | 4.7% | −71.6% |
| BWABwa | $39.8M | 4.7% | New |
| DNOWDnow | $38.9M | 4.5% | New |
| MBCMbc | $38.1M | 4.4% | |
| SITESite | $37.8M | 4.4% | |
| SWIMSwim | $36.6M | 4.3% | +9.7% |
| CLFDClfd | $32.2M | 3.8% | +10.2% |
| StCUSIP G8060N102 | $28.6M | 3.3% | New |
| Aero-swxCUSIP H55555108 | $28.5M | 3.3% | +30.4% |
| SHLSShls | $22.3M | 2.6% | New |
| EQPTEqpt | $20.9M | 2.4% | New |
| MEIMei | $16.6M | 1.9% | New |
Best picks still held
How each current holding has done since the quarter it first appeared in its filings (up to six years back).
| Stock | Held since | Return since | Now worth |
|---|---|---|---|
| MTRNMtrn | June 30, 2020 | +383.7% | $40.1M |
| HLIOHlio | September 30, 2025 | +71.2% | $60.8M |
| CLFDClfd | December 31, 2023 | +36.8% | $32.2M |
| WMSWms | June 30, 2025 | +36.7% | $61.2M |
| JhxCUSIP G4253H101 | September 30, 2025 | +36.3% | $55.0M |
| LFUSLfus | March 31, 2026 | +34.2% | $56.9M |
| ASTEAste | September 30, 2025 | +27.1% | $42.2M |
| SWIMSwim | March 31, 2026 | +20.5% | $36.6M |
| EXPExp | September 30, 2025 | −3.5% | $49.5M |
| SITESite | March 31, 2025 | −5.8% | $37.8M |
Sold off last quarter
- ROGRog was $51.0M
- NOVTNovt was $44.3M
- DXPEDxpe was $36.3M
- CDNLCdnl was $34.7M
- GVAGva was $30.0M
- CTSCts was $27.9M
Quarter by quarter
| Quarter | Its picks | S&P 500 |
|---|---|---|
| June 30, 2026 | +35.8% | +14.8% |
| March 31, 2026 | +6.6% | −4.6% |
| December 31, 2025 | +3.7% | +2.4% |
| September 30, 2025 | +12.4% | +7.8% |
| June 30, 2025 | +26.5% | +10.5% |
| March 31, 2025 | −11.7% | −4.6% |
| December 31, 2024 | −0.4% | +2.1% |
| September 30, 2024 | +1.4% | +5.4% |
| June 30, 2024 | −5.9% | +4.0% |
| March 31, 2024 | +7.9% | +10.0% |
| December 31, 2023 | +6.3% | +11.2% |
| September 30, 2023 | −14.3% | −3.6% |
| June 30, 2023 | +19.3% | +8.3% |
| March 31, 2023 | +13.6% | +7.0% |
| December 31, 2022 | +21.4% | +7.1% |
| September 30, 2022 | +0.6% | −5.3% |
| June 30, 2022 | −24.6% | −16.5% |
| March 31, 2022 | −12.1% | −4.9% |
| December 31, 2021 | +17.2% | +10.7% |
| September 30, 2021 | −6.5% | +0.3% |
Sources
Every number on this page points here. Each one links to the public record.
- 1SEC EDGAR: ACK Asset Management LLC Form 13F filingshttps://www.sec.gov/cgi-bin/browse-edgar?action=getcompany&CIK=1510940&type=13F-HR&dateb=&owner=include&count=40CIK 1510940
- 2SEC: 13F for the quarter ended June 30, 2026https://www.sec.gov/Archives/edgar/data/1510940/000151094026000005/Filed August 13, 2026 · accession 0001510940-26-000005