Arvin Capital Management LP In its 13F for Q3 2025 (holdings as of September 30, 2025, filed November 12, 2025), Arvin Capital Management LP reported 22 stock positions worth $432.0 million . Its top holding was Transalta (TAC) at 9.8% of the portfolio, followed by Thermo Fisher Scientific (TMO, 9.3% ) and Amentum (AMTM, 9.1% ). Compared with Q2 2025, it opened 6 new positions, sold out of 7, added to 10 and reduced 6. The biggest buy was Thermo Fisher Scientific (TMO, shares +59% ) and the biggest sale Amentum (AMTM, shares −24% ).
Location AUSTIN, TX
CIK 0001961738
Portfolio Value $432.0M (Q3 2025) Holdings 22 stocks · $432.0M Holdings quarter Q2 2026 Q1 2026 Q4 2025 Q3 2025 Q2 2025 Q1 2025 Q4 2024 Q3 2024 Q2 2024 Q1 2024
Stock % Of Portfolio ▼ Shares Held Total Value Change vs Q2 2025 TAC Transalta Corp. 3,107,000 $42.5M Add +5.9% TMO Thermo Fisher Scientific Inc. 82,470 $40.0M Add +58.7% AMTM Amentum Holdings Inc. 1,636,492 $39.2M Reduce -23.5% DHR Danaher Corp. 145,900 $28.9M Reduce -1.3% CRS Carpenter Technology 101,700 $25.0M Add +57.5% GEHC GE Healthcare Technology 314,268 $23.6M Add +130.8% AMZN Amazon.com Inc. 107,472 $23.6M Add +29.8% GXO Gxo Logistics Inc. 440,800 $23.3M Add +45.2% AL Sumisho Air Lease Corp. filed as AIR LEASE CORP 347,664 $22.1M Add +41.6% ITRI Itron Inc. 172,200 $21.4M Add +172.1% SNPS Synopsys Inc. 42,700 $21.1M Add +170.3% OPCH Option Care Health Inc. 742,361 $20.6M Add +56.5% MSFT Microsoft Corp. 24,600 $12.7M New ICLR Icon PLC 71,675 $12.5M New TSEM Tower Semiconductor Ltd. 170,976 $12.4M Reduce -41.3% PINS Pinterest Inc. Class A 351,554 $11.3M Reduce -28.4% RBA RB Global Inc. 95,100 $10.3M Reduce -27.5% U Unity Software Inc. 234,658 $9.4M New EFX Equifax Inc. 36,100 $9.3M New CEG Constellation Energy 26,132 $8.6M Reduce -19.7% IQV Iqvia Holdings Inc. 42,100 $8.0M New ACVA Acv Auctions Inc. Class A 616,190 $6.1M New
Options reported separately and not counted above: AMZN calls ($19.8M), DHR calls ($19.2M), HSIC calls ($13.3M), TECH calls ($12.7M), MSFT calls ($10.9M), CSX calls ($10.7M), TAC calls ($9.0M), TMO calls ($8.7M), KBR calls ($5.2M), GEHC calls ($3.8M), PZZA calls ($3.2M), OPCH calls ($2.8M), and 2 more.
Portfolio Sells Q2 2025 → Q3 2025 Portfolio Sells quarter Q2 2026 Q1 2026 Q4 2025 Q3 2025 Q2 2025 Q1 2025 Q4 2024 Q3 2024 Q2 2024 Q1 2024
Stock Change vs Q2 2025 % Of Portfolio Change To Portfolio ▲ AMTM Amentum Holdings Inc. Reduce -23.5% 9.07% −5.41 AVTR Avantor Inc. Sold out 0.00% −3.79 PZZA Papa John's Intl Inc. Sold out 0.00% −2.86 TECH Bio-Techne Corp. Sold out 0.00% −2.51 STX Seagate Technology Holdings Sold out 0.00% −2.49 PINS Pinterest Inc. Class A Reduce -28.4% 2.62% −2.43 ENTG Entegris Inc. Sold out 0.00% −2.12 DHR Danaher Corp. Reduce -1.3% 6.70% −1.67 RBA RB Global Inc. Reduce -27.5% 2.39% −1.61 CEG Constellation Energy Reduce -19.7% 1.99% −1.02 META Meta Platforms Inc. Class A Sold out 0.00% −1.01 SNDK Sandisk Corp. Sold out 0.00% −0.87 TSEM Tower Semiconductor Ltd. Reduce -41.3% 2.86% −0.76
Portfolio Buys Q2 2025 → Q3 2025 Portfolio Buys quarter Q2 2026 Q1 2026 Q4 2025 Q3 2025 Q2 2025 Q1 2025 Q4 2024 Q3 2024 Q2 2024 Q1 2024
Stock Change vs Q2 2025 % Of Portfolio Change To Portfolio ▼ TMO Thermo Fisher Scientific Inc. Add +58.7% 9.26% +3.22 MSFT Microsoft Corp. New 2.95% +2.95 ICLR Icon PLC New 2.90% +2.90 ITRI Itron Inc. Add +172.1% 4.97% +2.58 GEHC GE Healthcare Technology Add +130.8% 5.46% +2.57 SNPS Synopsys Inc. Add +170.3% 4.88% +2.56 U Unity Software Inc. New 2.18% +2.18 EFX Equifax Inc. New 2.14% +2.14 IQV Iqvia Holdings Inc. New 1.85% +1.85 ACVA Acv Auctions Inc. Class A New 1.41% +1.41 GXO Gxo Logistics Inc. Add +45.2% 5.40% +1.16 AL Sumisho Air Lease Corp. Add +41.6% 5.12% +1.01 TAC Transalta Corp. Add +5.9% 9.83% +0.76 CRS Carpenter Technology Add +57.5% 5.78% +0.67 OPCH Option Care Health Inc. Add +56.5% 4.77% +0.36 AMZN Amazon.com Inc. Add +29.8% 5.46% +0.26
Options Activity Q2 2025 → Q3 2025 Security Type Change vs Q2 2025 Underlying Shares Value ▼ SNPS Synopsys Inc. call Sold out 41,900 $21.5Mbefore exit AMZN Amazon.com Inc. call Reduce -14.3% 90,000 $19.8M DHR Danaher Corp. call Add +385.0% 97,000 $19.2M HSIC Henry Schein Inc. call New 200,000 $13.3M TECH Bio-Techne Corp. call New 228,000 $12.7M MSFT Microsoft Corp. call New 21,000 $10.9M CSX CSX Corp. call Reduce -40.0% 300,000 $10.7M VAL Valaris Ltd. call Sold out 250,000 $10.5Mbefore exit TAC Transalta Corp. call Reduce -32.7% 655,000 $9.0M AL Sumisho Air Lease Corp. call Sold out 150,400 $8.8Mbefore exit TMO Thermo Fisher Scientific Inc. call Add +50.0% 18,000 $8.7M GXO Gxo Logistics Inc. call Sold out 172,000 $8.4Mbefore exit AVTR Avantor Inc. call Sold out 550,000 $7.4Mbefore exit ARKK ARK Innovation ETF put Sold out 100,000 $7.0Mbefore exit PINS Pinterest Inc. Class A call Sold out 175,800 $6.3Mbefore exit KBR KBR Inc. call New 110,000 $5.2M BABA Alibaba Group Holding-SP ADR call Sold out 35,000 $4.0Mbefore exit GEHC GE Healthcare Technology call New 50,000 $3.8M PZZA Papa John's Intl Inc. call New 65,800 $3.2M OPCH Option Care Health Inc. call Add +9.4% 100,000 $2.8M AMTM Amentum Holdings Inc. call Sold out 100,000 $2.4Mbefore exit CCOI Cogent Communications Holdin call New 60,000 $2.3M IQV Iqvia Holdings Inc. call New 2,800 $532K TSEM Tower Semiconductor Ltd. call Sold out 7,900 $342Kbefore exit
Calls and puts are listed by the shares they cover; their value is not part of the stock holdings above.
Notes & Other Activity Q2 2025 → Q3 2025 Bonds, preferreds, convertibles and warrants; not part of the stock holdings or percentages above.
All Filings Quarter Positions 13F Reported Value Top Holdings Q2 2026 32 $534.0M TAC, VST, GXO, RKT, TMO Q1 2026 23 $427.9M TAC, TMO, AMTM, DHR, RBA Q4 2025 28 $464.2M TAC, AMTM, TMO, DHR, GXO Q3 2025 22 $432.0M TAC, TMO, AMTM, DHR, CRS Q2 2025 23 $348.9M AMTM, TAC, DHR, TMO, AMZN Q1 2025 22 $270.9M AMTM, CRS, TAC, TSEM, OPCH Q4 2024 27 $249.2M AMTM, CRS, AVTR, STX, AMZN Q3 2024 21 $236.9M AMZN, AVTR, STX, CRS, VAL Q2 2024 21 $232.5M TRU, LW, VAL, STX, JBI Q1 2024 20 $216.5M FIS, RIG, TRU, JBI, TECK