Atika Capital Management LLC
In its 13F for Q2 2026 (holdings as of June 30, 2026, filed August 13, 2026), Atika Capital Management LLC reported 62 stock positions worth $1.0 billion. Its top holding was Vertiv Class A (VRT) at 22.1% of the portfolio, followed by Seagate Technology (STX, 7.6%) and Advanced Micro Devices (AMD, 5.5%). Compared with Q1 2026, it opened 28 new positions, sold out of 18, added to 14 and reduced 11. The biggest buy was a new position in Advanced Micro Devices (AMD) and the biggest sale an exit from Terns Pharmaceuticals (TERN).
- Most Recent 13F
- Q2 2026
- Location
- NEW YORK, NY
- CIK
- 0001599731
- Portfolio Value
- $1.0B (Q2 2026)
- SEC Filing
- 0001214659-26-010035 ↗ filed Aug 13, 2026
Holdings Value
Holdings 62 stocks · $1.0B
| VRT Vertiv Holdings Co. Class A | 22.13% | 666,100 | $223.0M | No change |
| STX Seagate Technology Holdings | 7.65% | 79,865 | $77.1M | Add +49.3% |
| AMD Advanced Micro Devices | 5.50% | 95,500 | $55.5M | New |
| LLY Eli Lilly & Co. | 4.89% | 41,100 | $49.3M | No change |
| INTC Intel Corp. | 3.66% | 264,000 | $36.9M | New |
| ECHO Echostar Corp. Class A | 3.34% | 331,400 | $33.6M | Add +82.1% |
| GH Guardant Health Inc. | 2.69% | 181,000 | $27.2M | Add +98.9% |
| CIEN Ciena Corp. | 2.37% | 48,768 | $23.9M | Add +11.7% |
| ISRG Intuitive Surgical Inc. | 2.26% | 57,216 | $22.8M | No change |
| VPG Vishay Precision Group | 1.76% | 118,000 | $17.7M | New |
| MRVL Marvell Technology Inc. | 1.71% | 58,000 | $17.3M | New |
| RKLB Rocket Lab Corp. | 1.70% | 169,000 | $17.2M | Add +96.5% |
| WDC Western Digital Corp. | 1.68% | 26,477 | $16.9M | Reduce -29.8% |
| RVMD Revolution Medicines Inc. | 1.64% | 88,000 | $16.5M | New |
| ASND Ascendis Pharma A/S | 1.61% | 61,000 | $16.3M | Add +218.9% |
| DNTH Dianthus Therapeutics Inc. | 1.60% | 165,000 | $16.1M | Add +28.1% |
| AXSM Axsome Therapeutics Inc. | 1.53% | 63,000 | $15.4M | New |
| TEVA Teva Pharmaceutical-SP ADR | 1.48% | 440,000 | $14.9M | Reduce -7.8% |
| MTZ Mastec Inc. | 1.47% | 35,500 | $14.8M | Reduce -38.4% |
| SN Sharkninja Inc. | 1.33% | 88,000 | $13.4M | New |
| NFLX Netflix Inc. | 1.28% | 180,000 | $12.9M | No change |
| CW Curtiss-Wright Corp. | 1.20% | 16,000 | $12.1M | Add +23.1% |
| KYMR Kymera Therapeutics Inc. | 1.18% | 104,000 | $11.9M | New |
| SITM Sitime Corp. | 1.11% | 15,000 | $11.2M | Add +1.3% |
| TWST Twist Bioscience Corp. | 1.10% | 108,000 | $11.1M | New |
| REAL The Realreal Inc. filed as THE REALREAL INC | 1.10% | 940,000 | $11.1M | Add +108.4% |
| COGT Cogent Biosciences Inc. | 1.04% | 272,000 | $10.5M | Reduce -7.2% |
| BWXT BWX Technologies Inc. | 1.04% | 54,000 | $10.5M | Reduce -34.6% |
| AMZN Amazon.com Inc. | 1.04% | 44,000 | $10.5M | Add +0.7% |
| TBBB BBB Foods Inc. Class A | 1.03% | 250,000 | $10.4M | Add +162.6% |
| AXGN Axogen Inc. | 1.01% | 221,000 | $10.2M | New |
| NOK Nokia Corp.-Spon ADR | 0.99% | 750,000 | $10.0M | New |
| ORKA Oruka Therapeutics Inc. | 0.94% | 100,000 | $9.5M | Reduce -56.5% |
| TTMI TTM Technologies | 0.93% | 50,000 | $9.4M | Reduce -46.2% |
| CRL Charles River Laboratories | 0.86% | 38,000 | $8.6M | New |
| ACMR Acm Research Inc. Class A | 0.79% | 63,000 | $8.0M | New |
| ROIV Roivant Sciences Ltd. | 0.76% | 217,000 | $7.7M | New |
| MELI MercadoLibre Inc. | 0.76% | 4,510 | $7.7M | No change |
| APPF Appfolio Inc. Class A | 0.76% | 47,500 | $7.6M | No change |
| PTGX Protagonist Therapeutics Inc. | 0.76% | 62,100 | $7.6M | No change |
| RDDT Reddit Inc. Class A | 0.74% | 43,000 | $7.5M | New |
| SMTC Semtech Corp. | 0.74% | 46,000 | $7.4M | New |
| FIVE Five Below | 0.71% | 40,000 | $7.2M | Add +1.3% |
| FERG Ferguson Enterprises Inc. | 0.69% | 29,300 | $7.0M | No change |
| DFTX Definium Therapeutics Inc. | 0.57% | 122,000 | $5.7M | New |
| IMNM Immunome Inc. | 0.55% | 262,900 | $5.6M | No change |
| HUT Hut 8 Corp. | 0.51% | 44,500 | $5.1M | Reduce -9.7% |
| WRBY Warby Parker Inc. Class A | 0.45% | 150,000 | $4.6M | Add +11.1% |
| JATT Jatt II Acquisition Corp. | 0.45% | 400,000 | $4.5M | New |
| PRAX Praxis Precision Medicines I | 0.43% | 12,900 | $4.3M | New |
| LASR Nlight Inc. | 0.38% | 55,000 | $3.8M | Reduce -16.7% |
| ABVX Abivax SA-ADR | 0.36% | 27,000 | $3.6M | Reduce -6.3% |
| ALKS Alkermes PLC | 0.29% | 55,571 | $2.9M | New |
| CRWD CrowdStrike Holdings Inc. Class A | 0.29% | 3,800 | $2.9M | New |
| TARS Tarsus Pharmaceuticals Inc. | 0.25% | 40,000 | $2.5M | New |
| KRYS Krystal Biotech Inc. | 0.22% | 6,000 | $2.2M | Reduce -43.5% |
| VCEL Vericel Corp. | 0.15% | 34,000 | $1.5M | New |
| MANE Veradermics Inc. | 0.15% | 12,000 | $1.5M | New |
| KNSA Kiniksa Pharmaceuticals Inte | 0.15% | 23,000 | $1.5M | New |
| SG Sweetgreen Inc. Class A | 0.10% | 120,000 | $1.1M | New |
| SNDK Sandisk Corp. | 0.07% | 303 | $689K | New |
| STUB Stubhub Holdings Inc. Class A | 0.06% | 50,000 | $644K | New |
Options reported separately and not counted above: XBI puts ($89.0M), QQQ puts ($73.6M), GEV puts ($58.7M), AMZN calls ($52.9M), QQQ calls ($48.6M), MU puts ($34.6M), SMH puts ($33.5M), IGV puts ($24.6M), BTI calls ($20.4M), IBIT puts ($20.0M), DRAM puts ($15.5M), STUB calls ($11.6M), and 7 more.
Portfolio Sells Q1 2026 → Q2 2026
| TERN Terns Pharmaceuticals Inc. | Sold out | 0.00% | −2.50 |
| NET Cloudflare Inc. Class A | Sold out | 0.00% | −2.12 |
| GOOG Alphabet Inc. Class C | Sold out | 0.00% | −1.96 |
| BWXT BWX Technologies Inc. | Reduce -34.6% | 1.04% | −1.62 |
| MTZ Mastec Inc. | Reduce -38.4% | 1.47% | −1.46 |
| GDX Vaneck Gold Miners ETF | Sold out | 0.00% | −1.16 |
| UTHR United Therapeutics Corp. | Sold out | 0.00% | −1.16 |
| KRMN Karman Holdings Inc. | Sold out | 0.00% | −1.14 |
| CLH Clean Harbors Inc. | Sold out | 0.00% | −0.99 |
| TLN Talen Energy Corp. | Sold out | 0.00% | −0.93 |
| META Meta Platforms Inc. Class A | Sold out | 0.00% | −0.90 |
| DBVT DBV Technologies SA-Spon ADR | Sold out | 0.00% | −0.89 |
| ORKA Oruka Therapeutics Inc. | Reduce -56.5% | 0.94% | −0.84 |
| HEI Heico Corp. | Sold out | 0.00% | −0.83 |
| QXO Qxo Inc. | Sold out | 0.00% | −0.81 |
| TEVA Teva Pharmaceutical-SP ADR | Reduce -7.8% | 1.48% | −0.79 |
| COGT Cogent Biosciences Inc. | Reduce -7.2% | 1.04% | −0.74 |
| GE General Electric | Sold out | 0.00% | −0.69 |
| XENE Xenon Pharmaceuticals Inc. | Sold out | 0.00% | −0.55 |
| MAZE Maze Therapeutics Inc. | Sold out | 0.00% | −0.53 |
| TTMI TTM Technologies | Reduce -46.2% | 0.93% | −0.50 |
| ACHC Acadia Healthcare Co. Inc. | Sold out | 0.00% | −0.45 |
| BBIO Bridgebio Pharma Inc. | Sold out | 0.00% | −0.41 |
| HEI.A Heico Corp. Class A | Sold out | 0.00% | −0.35 |
| LASR Nlight Inc. | Reduce -16.7% | 0.38% | −0.21 |
| KRYS Krystal Biotech Inc. | Reduce -43.5% | 0.22% | −0.21 |
| ABVX Abivax SA-ADR | Reduce -6.3% | 0.36% | −0.15 |
| WDC Western Digital Corp. | Reduce -29.8% | 1.68% | +0.07 |
| HUT Hut 8 Corp. | Reduce -9.7% | 0.51% | +0.14 |
Portfolio Buys Q1 2026 → Q2 2026
| AMD Advanced Micro Devices | New | 5.50% | +5.50 |
| STX Seagate Technology Holdings | Add +49.3% | 7.65% | +4.34 |
| INTC Intel Corp. | New | 3.66% | +3.66 |
| VPG Vishay Precision Group | New | 1.76% | +1.76 |
| MRVL Marvell Technology Inc. | New | 1.71% | +1.71 |
| RVMD Revolution Medicines Inc. | New | 1.64% | +1.64 |
| AXSM Axsome Therapeutics Inc. | New | 1.53% | +1.53 |
| GH Guardant Health Inc. | Add +98.9% | 2.69% | +1.37 |
| SN Sharkninja Inc. | New | 1.33% | +1.33 |
| KYMR Kymera Therapeutics Inc. | New | 1.18% | +1.18 |
| TWST Twist Bioscience Corp. | New | 1.10% | +1.10 |
| AXGN Axogen Inc. | New | 1.01% | +1.01 |
| NOK Nokia Corp.-Spon ADR | New | 0.99% | +0.99 |
| ASND Ascendis Pharma A/S | Add +218.9% | 1.61% | +0.92 |
| CRL Charles River Laboratories | New | 0.86% | +0.86 |
| RKLB Rocket Lab Corp. | Add +96.5% | 1.70% | +0.83 |
| ACMR Acm Research Inc. Class A | New | 0.79% | +0.79 |
| ROIV Roivant Sciences Ltd. | New | 0.76% | +0.76 |
| RDDT Reddit Inc. Class A | New | 0.74% | +0.74 |
| SMTC Semtech Corp. | New | 0.74% | +0.74 |
| DFTX Definium Therapeutics Inc. | New | 0.57% | +0.57 |
| TBBB BBB Foods Inc. Class A | Add +162.6% | 1.03% | +0.50 |
| REAL The Realreal Inc. | Add +108.4% | 1.10% | +0.45 |
| JATT Jatt II Acquisition Corp. | New | 0.45% | +0.45 |
| PRAX Praxis Precision Medicines I | New | 0.43% | +0.43 |
| SITM Sitime Corp. | Add +1.3% | 1.11% | +0.30 |
| ALKS Alkermes PLC | New | 0.29% | +0.29 |
| CRWD CrowdStrike Holdings Inc. Class A | New | 0.29% | +0.29 |
| TARS Tarsus Pharmaceuticals Inc. | New | 0.25% | +0.25 |
| VCEL Vericel Corp. | New | 0.15% | +0.15 |
| MANE Veradermics Inc. | New | 0.15% | +0.15 |
| KNSA Kiniksa Pharmaceuticals Inte | New | 0.15% | +0.15 |
| SG Sweetgreen Inc. Class A | New | 0.10% | +0.10 |
| SNDK Sandisk Corp. | New | 0.07% | +0.07 |
| STUB Stubhub Holdings Inc. Class A | New | 0.06% | +0.06 |
| WRBY Warby Parker Inc. Class A | Add +11.1% | 0.45% | +0.00 |
| ECHO Echostar Corp. Class A | Add +82.1% | 3.34% | −0.02 |
| DNTH Dianthus Therapeutics Inc. | Add +28.1% | 1.60% | −0.11 |
| CW Curtiss-Wright Corp. | Add +23.1% | 1.20% | −0.19 |
| CIEN Ciena Corp. | Add +11.7% | 2.37% | −0.30 |
| AMZN Amazon.com Inc. | Add +0.7% | 1.04% | −0.40 |
| FIVE Five Below | Add +1.3% | 0.71% | −0.71 |
Options Activity Q1 2026 → Q2 2026
| XBI SS SPDR S&P Biotech ETF | put | Add +33.1% | 5,625 | $89.0M |
| QQQ Invesco QQQ Trust Series 1 | put | New | 1,000 | $73.6M |
| GEV GE Vernova Inc. | put | New | 500 | $58.7M |
| AMZN Amazon.com Inc. | call | New | 2,220 | $52.9M |
| QQQ Invesco QQQ Trust Series 1 | call | New | 660 | $48.6M |
| MU Micron Technology Inc. | put | New | 300 | $34.6M |
| SMH Vaneck Semiconductor ETF | put | Reduce -29.2% | 510 | $33.5M |
| IWM iShares Russell 2000 ETF | put | Sold out | 1,000 | $24.8Mbefore exit |
| IGV iShares Expanded Tech-Softwa | put | New | 2,720 | $24.6M |
| BTI British American Tob-SP ADR | call | New | 3,300 | $20.4M |
| IBIT iShares Bitcoin Trust ETF | put | New | 6,000 | $20.0M |
| NFLX Netflix Inc. | call | Sold out | 1,650 | $15.9Mbefore exit |
| DRAM Roundhill Memory ETF | put | New | 2,100 | $15.5M |
| GDX Vaneck Gold Miners ETF | call | Sold out | 1,500 | $13.8Mbefore exit |
| STUB Stubhub Holdings Inc. Class A | call | New | 9,000 | $11.6M |
| ALKS Alkermes PLC | call | New | 1,600 | $8.4M |
| ECHO Echostar Corp. Class A | call | Reduce -55.2% | 709 | $7.2M |
| ENPH Enphase Energy Inc. | call | New | 1,200 | $5.9M |
| INTC Intel Corp. | call | Sold out | 1,000 | $4.4Mbefore exit |
| TERN Terns Pharmaceuticals Inc. | call | Sold out | 720 | $3.8Mbefore exit |
| CRWV Coreweave Inc. Class A | call | New | 350 | $3.5M |
| TEVA Teva Pharmaceutical-SP ADR | call | New | 1,000 | $3.4M |
| CLF Cleveland-Cliffs Inc. | call | New | 1,500 | $1.4M |
| KEEL Keel Infrastructure Corp. | call | New | 1,500 | $861K |
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 | 62 | $1.0B | VRT, STX, AMD, LLY, INTC |
| Q1 2026 | 52 | $633.6M | VRT, LLY, ISRG, ECHO, STX |
| Q4 2025 | 64 | $718.1M | VRT, LLY, ISRG, TEVA, SHOP |
| Q3 2025 | 76 | $1.2B | VRT, AMZN, MSFT, SPOT, MLM |
| Q2 2025 | 57 | $957.3M | AMZN, VRT, MSFT, SPOT, MLM |
| Q1 2025 | 53 | $651.3M | AMZN, MSFT, VRT, SPOT, LLY |
| Q4 2024 | 73 | $772.3M | MSFT, VRT, AMZN, GKOS, INSP |
| Q3 2024 | 74 | $935.1M | NVDA, MSFT, MELI, AMZN, VRT |
| Q2 2024 | 75 | $862.5M | NVDA, MSFT, AMZN, VRT, MELI |
| Q1 2024 | 79 | $891.5M | NVDA, SWAV, MSFT, VRT, INSP |