Harvey Partners, LLC
In its 13F for Q2 2026 (holdings as of June 30, 2026, filed August 14, 2026), Harvey Partners, LLC reported 47 stock positions worth $1.4 billion. Its top holding was Enpro (NPO) at 5.4% of the portfolio, followed by Materion (MTRN, 4.5%) and MKS (MKSI, 4.4%). Compared with Q1 2026, it opened 6 new positions, sold out of 4, added to 16 and reduced 24. The biggest buy was a new position in Ceco Environmental (CECO) and the biggest sale an exit from Thermon (THR).
- Most Recent 13F
- Q2 2026
- Location
- Tarrytown, NY
- CIK
- 0001406484
- Portfolio Value
- $1.4B (Q2 2026)
- SEC Filing
- 0001214659-26-010396 ↗ filed Aug 14, 2026
Holdings Value
Holdings 47 stocks · $1.4B
| NPO Enpro Inc. | 5.43% | 207,593 | $78.2M | Reduce -18.1% |
| MTRN Materion Corp. | 4.54% | 220,068 | $65.4M | Reduce -24.9% |
| MKSI MKS Inc. | 4.35% | 141,066 | $62.7M | Reduce -42.0% |
| NGVT Ingevity Corp. | 3.80% | 734,307 | $54.8M | Reduce -1.2% |
| ADEA Adeia Inc. | 3.70% | 1,622,353 | $53.4M | Reduce -41.1% |
| LFUS Littelfuse Inc. | 3.55% | 112,547 | $51.2M | Reduce -7.4% |
| MLM Martin Marietta Materials | 3.48% | 87,035 | $50.2M | Add +36.1% |
| AZZ Azz Inc. | 3.47% | 323,137 | $50.1M | Reduce -8.1% |
| WCN Waste Connections Inc. | 3.32% | 287,122 | $47.9M | Add +11.1% |
| NOVT Novanta Inc. | 3.31% | 294,122 | $47.7M | Reduce -8.1% |
| BWXT BWX Technologies Inc. | 3.28% | 243,107 | $47.3M | Reduce -4.8% |
| THRM Gentherm Inc. | 3.14% | 1,326,075 | $45.2M | Add +7.5% |
| BV Brightview Holdings Inc. | 3.02% | 3,078,797 | $43.6M | Add +4.8% |
| ASTE Astec Industries Inc. | 2.86% | 674,000 | $41.2M | Add +0.3% |
| BALL Ball Corp. | 2.83% | 653,286 | $40.8M | Add +16.7% |
| BATRK Atlanta Braves Holdings in-C | 2.72% | 756,832 | $39.3M | Reduce -6.1% |
| POOL Pool Corp. | 2.59% | 174,074 | $37.4M | Add +28.9% |
| SMG Scotts Miracle-Gro Co. | 2.56% | 542,727 | $37.0M | Add +24.1% |
| CTS CTS Corp. | 2.46% | 545,231 | $35.5M | Reduce -8.3% |
| AWI Armstrong World Industries | 2.28% | 205,087 | $32.9M | Add +4.6% |
| ULS Ul Solutions Inc. Class A | 2.26% | 320,656 | $32.7M | Reduce -6.4% |
| CWST Casella Waste Systems Inc. Class A | 2.09% | 310,131 | $30.1M | Add +10.2% |
| CECO Ceco Environmental Corp. | 1.96% | 311,132 | $28.2M | New |
| RTO Rentokil Initial PLC-SP ADR | 1.95% | 983,956 | $28.2M | Add +0.9% |
| VPG Vishay Precision Group | 1.85% | 177,659 | $26.6M | Reduce -55.8% |
| MANU Manchester United PLC Class A | 1.79% | 1,127,547 | $25.9M | Reduce -7.0% |
| KN Knowles Corp. | 1.77% | 613,805 | $25.5M | Reduce -7.6% |
| ICHR Ichor Holdings Ltd. | 1.60% | 205,874 | $23.1M | Reduce -56.1% |
| BCPC Balchem Corp. | 1.59% | 136,057 | $23.0M | Add +18.5% |
| LASR Nlight Inc. | 1.46% | 302,711 | $21.1M | Reduce -26.8% |
| NOK Nokia Corp.-Spon ADR | 1.34% | 1,454,626 | $19.3M | Reduce -50.6% |
| CTAS Cintas Corp. | 1.32% | 111,547 | $19.0M | New |
| FWONK Liberty Media Corp. Class C | 1.15% | 174,000 | $16.6M | Add +40.9% |
| SITE Siteone Landscape Supply Inc. | 1.14% | 144,059 | $16.5M | New |
| PANW Palo Alto Networks Inc. | 1.14% | 48,000 | $16.4M | Reduce -47.3% |
| AIN Albany Intl Corp. Class A | 1.13% | 218,090 | $16.2M | New |
| RSKD Riskified Ltd. Class A | 1.11% | 3,165,547 | $16.0M | Reduce -6.8% |
| CALX Calix Inc. | 1.09% | 420,500 | $15.7M | Reduce -26.6% |
| WH Wyndham Hotels & Resorts Inc. | 0.92% | 157,567 | $13.3M | Add +30.2% |
| SPY SS SPDR S&P 500 ETF Trust-US | 0.78% | 15,000 | $11.2M | Add +15.4% |
| MTRX Matrix Service Co. | 0.77% | 815,023 | $11.2M | Reduce -9.9% |
| FND Floor & Decor Holdings Inc. Class A | 0.64% | 155,566 | $9.2M | New |
| FWONA Liberty Media Corp. Class A | 0.62% | 102,119 | $8.9M | Add +70.2% |
| OEC Orion SA | 0.55% | 1,190,579 | $7.9M | Reduce -8.7% |
| AADX Applied Aerospace & Defense | 0.52% | 329,178 | $7.5M | New |
| APLD Applied Digital Corp. | 0.39% | 150,000 | $5.6M | No change |
| CHKP Check Point Software Tech | 0.38% | 41,500 | $5.5M | Reduce -62.1% |
Options reported separately and not counted above: IWM puts ($18.0M).
Portfolio Sells Q1 2026 → Q2 2026
| THR Thermon Group Holdings Inc. | Sold out | 0.00% | −2.65 |
| ADEA Adeia Inc. | Reduce -41.1% | 3.70% | −1.67 |
| CALX Calix Inc. | Reduce -26.6% | 1.09% | −1.19 |
| BWXT BWX Technologies Inc. | Reduce -4.8% | 3.28% | −0.96 |
| CHKP Check Point Software Tech | Reduce -62.1% | 0.38% | −0.89 |
| GLDD Great Lakes Dredge & Dock Co. | Sold out | 0.00% | −0.84 |
| DNOW Dnow Inc. | Sold out | 0.00% | −0.71 |
| NOK Nokia Corp.-Spon ADR | Reduce -50.6% | 1.34% | −0.58 |
| NGVT Ingevity Corp. | Reduce -1.2% | 3.80% | −0.50 |
| LASR Nlight Inc. | Reduce -26.8% | 1.46% | −0.45 |
| VRNS Varonis Systems Inc. | Sold out | 0.00% | −0.24 |
| MKSI MKS Inc. | Reduce -42.0% | 4.35% | −0.19 |
| ICHR Ichor Holdings Ltd. | Reduce -56.1% | 1.60% | −0.17 |
| OEC Orion SA | Reduce -8.7% | 0.55% | −0.14 |
| ULS Ul Solutions Inc. Class A | Reduce -6.4% | 2.26% | −0.12 |
| AZZ Azz Inc. | Reduce -8.1% | 3.47% | −0.10 |
| BATRK Atlanta Braves Holdings in-C | Reduce -6.1% | 2.72% | −0.07 |
| MTRX Matrix Service Co. | Reduce -9.9% | 0.77% | −0.07 |
| PANW Palo Alto Networks Inc. | Reduce -47.3% | 1.14% | −0.05 |
| RSKD Riskified Ltd. Class A | Reduce -6.8% | 1.11% | +0.03 |
| MANU Manchester United PLC Class A | Reduce -7.0% | 1.79% | +0.14 |
| CTS CTS Corp. | Reduce -8.3% | 2.46% | +0.16 |
| LFUS Littelfuse Inc. | Reduce -7.4% | 3.55% | +0.20 |
| NOVT Novanta Inc. | Reduce -8.1% | 3.31% | +0.24 |
| NPO Enpro Inc. | Reduce -18.1% | 5.43% | +0.26 |
| KN Knowles Corp. | Reduce -7.6% | 1.77% | +0.38 |
| VPG Vishay Precision Group | Reduce -55.8% | 1.85% | +0.43 |
| MTRN Materion Corp. | Reduce -24.9% | 4.54% | +1.09 |
Portfolio Buys Q1 2026 → Q2 2026
| CECO Ceco Environmental Corp. | New | 1.96% | +1.96 |
| CTAS Cintas Corp. | New | 1.32% | +1.32 |
| SITE Siteone Landscape Supply Inc. | New | 1.14% | +1.14 |
| AIN Albany Intl Corp. Class A | New | 1.13% | +1.13 |
| FND Floor & Decor Holdings Inc. Class A | New | 0.64% | +0.64 |
| AADX Applied Aerospace & Defense | New | 0.52% | +0.52 |
| MLM Martin Marietta Materials | Add +36.1% | 3.48% | +0.42 |
| SMG Scotts Miracle-Gro Co. | Add +24.1% | 2.56% | +0.40 |
| POOL Pool Corp. | Add +28.9% | 2.59% | +0.38 |
| THRM Gentherm Inc. | Add +7.5% | 3.14% | +0.35 |
| FWONK Liberty Media Corp. Class C | Add +40.9% | 1.15% | +0.29 |
| CWST Casella Waste Systems Inc. Class A | Add +10.2% | 2.09% | +0.27 |
| FWONA Liberty Media Corp. Class A | Add +70.2% | 0.62% | +0.24 |
| BV Brightview Holdings Inc. | Add +4.8% | 3.02% | +0.21 |
| BALL Ball Corp. | Add +16.7% | 2.83% | +0.14 |
| WH Wyndham Hotels & Resorts Inc. | Add +30.2% | 0.92% | +0.12 |
| SPY SS SPDR S&P 500 ETF Trust-US | Add +15.4% | 0.78% | +0.09 |
| BCPC Balchem Corp. | Add +18.5% | 1.59% | +0.01 |
| ASTE Astec Industries Inc. | Add +0.3% | 2.86% | −0.08 |
| WCN Waste Connections Inc. | Add +11.1% | 3.32% | −0.09 |
| AWI Armstrong World Industries | Add +4.6% | 2.28% | −0.34 |
| RTO Rentokil Initial PLC-SP ADR | Add +0.9% | 1.95% | −0.54 |
Options Activity Q1 2026 → Q2 2026
| IWM iShares Russell 2000 ETF | put | Add +84.6% | 60,000 | $18.0M |
| QQQ Invesco QQQ Trust Series 1 | put | Sold out | 30,000 | $17.3Mbefore exit |
Calls and puts are listed by the shares they cover; their value is not part of the stock holdings above.
All Filings
| Quarter | Positions | 13F Reported Value | Top Holdings |
|---|---|---|---|
| Q2 2026 | 47 | $1.4B | NPO, MTRN, MKSI, NGVT, ADEA |
| Q1 2026 | 45 | $1.2B | ADEA, NPO, MKSI, NGVT, BWXT |
| Q4 2025 | 43 | $1.1B | NPO, GLDD, MKSI, ADEA, LASR |
| Q3 2025 | 44 | $1.1B | NPO, BWXT, AZZ, GLDD, ADEA |
| Q2 2025 | 41 | $1.0B | AZZ, WCN, BWXT, BV, NPO |
| Q1 2025 | 41 | $843.4M | WCN, AZZ, ADEA, RTO, NPO |
| Q4 2024 | 41 | $887.1M | AZZ, WCN, ADEA, GLDD, RTO |
| Q3 2024 | 42 | $869.5M | AZZ, WCN, BWXT, GLDD, ADEA |
| Q2 2024 | 39 | $808.6M | AZZ, WCN, BWXT, HII, OEC |
| Q1 2024 | 40 | $921.9M | AZZ, BWXT, HII, VRNS, OEC |