Atika Capital Management LLC
In its 13F for Q3 2025 (holdings as of September 30, 2025, filed November 13, 2025), Atika Capital Management LLC reported 76 stock positions worth $1.2 billion. Its top holding was Vertiv Class A (VRT) at 7.9% of the portfolio, followed by Amazon.com (AMZN, 7.4%) and Microsoft (MSFT, 7.3%). Compared with Q2 2025, it opened 27 new positions, sold out of 8, added to 20 and reduced 20. The biggest buy was a new position in Seagate Technology (STX) and the biggest sale Glaukos (GKOS, shares −34%).
- Most Recent 13F
- Q2 2026
- Location
- NEW YORK, NY
- CIK
- 0001599731
- Portfolio Value
- $1.2B (Q3 2025)
- SEC Filing
- 0001214659-25-016379 ↗ filed Nov 13, 2025
Holdings Value
Holdings 76 stocks · $1.2B
| VRT Vertiv Holdings Co. Class A | 7.88% | 613,100 | $92.5M | No change |
| AMZN Amazon.com Inc. | 7.43% | 397,049 | $87.2M | Reduce -0.3% |
| MSFT Microsoft Corp. | 7.28% | 165,000 | $85.5M | Add +4.4% |
| SPOT Spotify Technology SA | 3.74% | 62,870 | $43.9M | Add +0.6% |
| MLM Martin Marietta Materials | 3.68% | 68,483 | $43.2M | Reduce -5.6% |
| BWXT BWX Technologies Inc. | 3.41% | 217,400 | $40.1M | Add +3.3% |
| ANET Arista Networks Inc. | 2.87% | 231,208 | $33.7M | Reduce -11.6% |
| LLY Eli Lilly & Co. | 2.67% | 41,100 | $31.4M | No change |
| CEG Constellation Energy | 2.66% | 94,800 | $31.2M | No change |
| TLN Talen Energy Corp. | 2.51% | 69,300 | $29.5M | Add +15.9% |
| STX Seagate Technology Holdings | 2.37% | 118,096 | $27.9M | New |
| GEV GE Vernova Inc. | 2.22% | 42,439 | $26.1M | Reduce -0.3% |
| META Meta Platforms Inc. Class A | 2.22% | 35,500 | $26.1M | Reduce -6.6% |
| ISRG Intuitive Surgical Inc. | 2.18% | 57,236 | $25.6M | Reduce -4.0% |
| VST Vistra Corp. | 2.05% | 123,000 | $24.1M | Reduce -0.8% |
| CYBR Cyberark Software Ltd./Israel | 1.85% | 44,855 | $21.7M | Add +15.4% |
| NFLX Netflix Inc. | 1.84% | 18,000 | $21.6M | Add +50.0% |
| NET Cloudflare Inc. Class A | 1.79% | 98,010 | $21.0M | Add +42.5% |
| NBIS Nebius Group NV | 1.72% | 179,880 | $20.2M | Add +158.8% |
| RBLX Roblox Corp. Class A | 1.68% | 142,500 | $19.7M | Add +30.7% |
| VRNA Verona Pharma Ltd. | 1.60% | 176,000 | $18.8M | Reduce -17.2% |
| MELI MercadoLibre Inc. | 1.58% | 7,930 | $18.5M | Reduce -20.7% |
| HOOD Robinhood Markets Inc. Class A | 1.48% | 121,000 | $17.3M | Reduce -44.5% |
| GKOS Glaukos Corp. | 1.48% | 212,400 | $17.3M | Reduce -33.5% |
| DASH DoorDash Inc. Class A | 1.46% | 63,201 | $17.2M | Reduce -4.8% |
| CDTX Cidara Therapeutics Inc. | 1.28% | 157,320 | $15.1M | New |
| INSP Inspire Medical Systems Inc. | 1.19% | 187,600 | $13.9M | Add +15.9% |
| NVDA Nvidia Corp. | 1.17% | 73,900 | $13.8M | Add +25.7% |
| TSLA Tesla Inc. | 1.17% | 31,000 | $13.8M | New |
| INSM Insmed Inc. | 1.17% | 95,000 | $13.7M | New |
| ADBE Adobe Inc. | 1.16% | 38,698 | $13.7M | Add +73.5% |
| ROKU Roku Inc. | 1.13% | 133,000 | $13.3M | Add +198.2% |
| APPF Appfolio Inc. Class A | 1.04% | 44,500 | $12.3M | No change |
| SHOP Shopify Inc. Class A | 0.99% | 78,500 | $11.7M | Add +13.1% |
| CIEN Ciena Corp. | 0.99% | 80,000 | $11.7M | New |
| ALNY Alnylam Pharmaceuticals Inc. | 0.86% | 22,206 | $10.1M | Reduce -19.8% |
| GE General Electric filed as GE AEROSPACE | 0.85% | 33,000 | $9.9M | Add +5.0% |
| EYE National Vision Holdings Inc. | 0.75% | 301,000 | $8.8M | Reduce -27.3% |
| ASML ASML Holding NV-NY Reg SHS | 0.72% | 8,740 | $8.5M | New |
| MTZ Mastec Inc. | 0.72% | 39,500 | $8.4M | Reduce -19.7% |
| GH Guardant Health Inc. | 0.71% | 133,000 | $8.3M | Add +49.1% |
| NTRA Natera Inc. | 0.64% | 46,497 | $7.5M | No change |
| DHI D.R. Horton Inc. | 0.64% | 44,000 | $7.5M | New |
| DUOL Duolingo | 0.61% | 22,200 | $7.1M | Add +5.2% |
| FIVE Five Below | 0.60% | 45,500 | $7.0M | New |
| MLYS Mineralys Therapeutics Inc. | 0.56% | 174,000 | $6.6M | New |
| FERG Ferguson Enterprises Inc. | 0.56% | 29,300 | $6.6M | No change |
| AXSM Axsome Therapeutics Inc. | 0.51% | 49,000 | $6.0M | Add +6.2% |
| ABVX Abivax SA-ADR | 0.50% | 69,000 | $5.9M | New |
| PTGX Protagonist Therapeutics Inc. | 0.47% | 83,000 | $5.5M | New |
| CALX Calix Inc. | 0.47% | 89,500 | $5.5M | New |
| CW Curtiss-Wright Corp. | 0.46% | 10,051 | $5.5M | Reduce -12.6% |
| ECHO Echostar Corp. Class A | 0.45% | 69,000 | $5.3M | Add +185.1% |
| QURE Uniqure NV | 0.45% | 90,000 | $5.3M | New |
| GNRC Generac Holdings Inc. | 0.44% | 31,000 | $5.2M | New |
| SPNT Siriuspoint Ltd. | 0.40% | 260,000 | $4.7M | Reduce -3.5% |
| KYMR Kymera Therapeutics Inc. | 0.39% | 81,300 | $4.6M | Reduce -44.5% |
| TEVA Teva Pharmaceutical-SP ADR | 0.39% | 224,000 | $4.5M | New |
| ASND Ascendis Pharma A/S | 0.38% | 22,160 | $4.4M | Add +35.1% |
| TBBB BBB Foods Inc. Class A | 0.37% | 159,000 | $4.3M | Reduce -1.6% |
| SN Sharkninja Inc. | 0.35% | 40,000 | $4.1M | Reduce -53.2% |
| REAL The Realreal Inc. filed as THE REALREAL INC | 0.34% | 374,000 | $4.0M | New |
| AVGO Broadcom Inc. | 0.32% | 11,500 | $3.8M | New |
| LMND Lemonade Inc. | 0.31% | 69,000 | $3.7M | New |
| U Unity Software Inc. | 0.27% | 80,000 | $3.2M | New |
| RXST Rxsight Inc. | 0.27% | 354,907 | $3.2M | No change |
| NTSK Netskope Inc. Class A | 0.22% | 114,000 | $2.6M | New |
| HTFL Heartflow Inc. | 0.20% | 69,000 | $2.3M | New |
| FND Floor & Decor Holdings Inc. Class A | 0.19% | 30,000 | $2.2M | New |
| FIGR Figure Technology Solut Class A | 0.17% | 54,000 | $2.0M | New |
| XENE Xenon Pharmaceuticals Inc. | 0.13% | 38,000 | $1.5M | New |
| IONS Ionis Pharmaceuticals Inc. | 0.12% | 21,500 | $1.4M | New |
| ZURA Zura Bio Ltd. | 0.10% | 276,000 | $1.2M | New |
| IBM Intl Business Machines Corp. filed as INTERNATIONAL BUSINESS MACHS | 0.07% | 2,708 | $764K | New |
| CAI Caris Life Sciences Inc. | 0.06% | 25,000 | $756K | No change |
| STAA Staar Surgical Co. | 0.04% | 16,400 | $441K | No change |
Options reported separately and not counted above: ECHO calls ($30.4M), KVUE calls ($9.4M), FND calls ($5.9M), STX calls ($5.5M), U calls ($5.2M), KMLM calls ($4.2M), AI puts ($3.6M), INFY puts ($1.6M), RARE calls ($1.5M), CDTX calls ($469K).
Portfolio Sells Q2 2025 → Q3 2025
| GKOS Glaukos Corp. | Reduce -33.5% | 1.48% | −1.97 |
| AMZN Amazon.com Inc. | Reduce -0.3% | 7.43% | −1.70 |
| ISRG Intuitive Surgical Inc. | Reduce -4.0% | 2.18% | −1.20 |
| MELI MercadoLibre Inc. | Reduce -20.7% | 1.58% | −1.15 |
| SLNO Soleno Therapeutics Inc. | Sold out | 0.00% | −1.05 |
| TW Tradeweb Markets Inc. Class A | Sold out | 0.00% | −0.76 |
| WWD Woodward Inc. | Sold out | 0.00% | −0.73 |
| META Meta Platforms Inc. Class A | Reduce -6.6% | 2.22% | −0.71 |
| HOOD Robinhood Markets Inc. Class A | Reduce -44.5% | 1.48% | −0.66 |
| SN Sharkninja Inc. | Reduce -53.2% | 0.35% | −0.53 |
| VRNA Verona Pharma Ltd. | Reduce -17.2% | 1.60% | −0.50 |
| TKO Tko Group Holdings Inc. | Sold out | 0.00% | −0.50 |
| MLM Martin Marietta Materials | Reduce -5.6% | 3.68% | −0.48 |
| VST Vistra Corp. | Reduce -0.8% | 2.05% | −0.46 |
| KYMR Kymera Therapeutics Inc. | Reduce -44.5% | 0.39% | −0.28 |
| EYE National Vision Holdings Inc. | Reduce -27.3% | 0.75% | −0.25 |
| DASH DoorDash Inc. Class A | Reduce -4.8% | 1.46% | −0.25 |
| TSM Taiwan Semiconductor-SP ADR | Sold out | 0.00% | −0.24 |
| HNGE Hinge Health Inc. Class A | Sold out | 0.00% | −0.24 |
| SPNT Siriuspoint Ltd. | Reduce -3.5% | 0.40% | −0.17 |
| MTZ Mastec Inc. | Reduce -19.7% | 0.72% | −0.16 |
| NOVT Novanta Inc. | Sold out | 0.00% | −0.14 |
| GEV GE Vernova Inc. | Reduce -0.3% | 2.22% | −0.13 |
| CW Curtiss-Wright Corp. | Reduce -12.6% | 0.46% | −0.12 |
| TBBB BBB Foods Inc. Class A | Reduce -1.6% | 0.37% | −0.10 |
| WRBY Warby Parker Inc. Class A | Sold out | 0.00% | −0.10 |
| ALNY Alnylam Pharmaceuticals Inc. | Reduce -19.8% | 0.86% | −0.08 |
| ANET Arista Networks Inc. | Reduce -11.6% | 2.87% | +0.07 |
Portfolio Buys Q2 2025 → Q3 2025
| STX Seagate Technology Holdings | New | 2.37% | +2.37 |
| NBIS Nebius Group NV | Add +158.8% | 1.72% | +1.32 |
| CDTX Cidara Therapeutics Inc. | New | 1.28% | +1.28 |
| TSLA Tesla Inc. | New | 1.17% | +1.17 |
| INSM Insmed Inc. | New | 1.17% | +1.17 |
| CIEN Ciena Corp. | New | 0.99% | +0.99 |
| ROKU Roku Inc. | Add +198.2% | 1.13% | +0.72 |
| ASML ASML Holding NV-NY Reg SHS | New | 0.72% | +0.72 |
| TLN Talen Energy Corp. | Add +15.9% | 2.51% | +0.69 |
| DHI D.R. Horton Inc. | New | 0.64% | +0.64 |
| FIVE Five Below | New | 0.60% | +0.60 |
| MLYS Mineralys Therapeutics Inc. | New | 0.56% | +0.56 |
| ABVX Abivax SA-ADR | New | 0.50% | +0.50 |
| RBLX Roblox Corp. Class A | Add +30.7% | 1.68% | +0.48 |
| PTGX Protagonist Therapeutics Inc. | New | 0.47% | +0.47 |
| CALX Calix Inc. | New | 0.47% | +0.47 |
| QURE Uniqure NV | New | 0.45% | +0.45 |
| GNRC Generac Holdings Inc. | New | 0.44% | +0.44 |
| TEVA Teva Pharmaceutical-SP ADR | New | 0.39% | +0.39 |
| NET Cloudflare Inc. Class A | Add +42.5% | 1.79% | +0.38 |
| ECHO Echostar Corp. Class A | Add +185.1% | 0.45% | +0.38 |
| REAL The Realreal Inc. | New | 0.34% | +0.34 |
| AVGO Broadcom Inc. | New | 0.32% | +0.32 |
| LMND Lemonade Inc. | New | 0.31% | +0.31 |
| U Unity Software Inc. | New | 0.27% | +0.27 |
| ADBE Adobe Inc. | Add +73.5% | 1.16% | +0.26 |
| BWXT BWX Technologies Inc. | Add +3.3% | 3.41% | +0.25 |
| GH Guardant Health Inc. | Add +49.1% | 0.71% | +0.22 |
| NTSK Netskope Inc. Class A | New | 0.22% | +0.22 |
| NVDA Nvidia Corp. | Add +25.7% | 1.17% | +0.20 |
| HTFL Heartflow Inc. | New | 0.20% | +0.20 |
| CYBR Cyberark Software Ltd./Israel | Add +15.4% | 1.85% | +0.19 |
| FND Floor & Decor Holdings Inc. Class A | New | 0.19% | +0.19 |
| FIGR Figure Technology Solut Class A | New | 0.17% | +0.17 |
| NFLX Netflix Inc. | Add +50.0% | 1.84% | +0.16 |
| SHOP Shopify Inc. Class A | Add +13.1% | 0.99% | +0.16 |
| XENE Xenon Pharmaceuticals Inc. | New | 0.13% | +0.13 |
| IONS Ionis Pharmaceuticals Inc. | New | 0.12% | +0.12 |
| ZURA Zura Bio Ltd. | New | 0.10% | +0.10 |
| ASND Ascendis Pharma A/S | Add +35.1% | 0.38% | +0.08 |
| IBM Intl Business Machines Corp. | New | 0.07% | +0.07 |
| AXSM Axsome Therapeutics Inc. | Add +6.2% | 0.51% | +0.00 |
| GE General Electric | Add +5.0% | 0.85% | +0.00 |
| DUOL Duolingo | Add +5.2% | 0.61% | −0.30 |
| MSFT Microsoft Corp. | Add +4.4% | 7.28% | −0.93 |
| INSP Inspire Medical Systems Inc. | Add +15.9% | 1.19% | −1.01 |
| SPOT Spotify Technology SA | Add +0.6% | 3.74% | −1.27 |
Options Activity Q2 2025 → Q3 2025
| ECHO Echostar Corp. Class A | call | Reduce -8.9% | 3,983 | $30.4M |
| AMZN Amazon.com Inc. | call | Sold out | 500 | $11.0Mbefore exit |
| KVUE Kenvue Inc. | call | New | 5,785 | $9.4M |
| UBER Uber Technologies Inc. | call | Sold out | 1,000 | $9.3Mbefore exit |
| MDT Medtronic PLC | call | Sold out | 720 | $6.3Mbefore exit |
| FND Floor & Decor Holdings Inc. Class A | call | Add +166.7% | 800 | $5.9M |
| STX Seagate Technology Holdings | call | New | 234 | $5.5M |
| U Unity Software Inc. | call | New | 1,300 | $5.2M |
| KMLM Kraneshares MT LC MN FT Id S | call | New | 1,000 | $4.2M |
| AI C3.AI Inc. Class A | put | New | 2,103 | $3.6M |
| WBA Walgreens Boots Alliance Inc. | put | Sold out | 1,500 | $1.7Mbefore exit |
| INFY Infosys Ltd.-SP ADR | put | New | 1,000 | $1.6M |
| RARE Ultragenyx Pharmaceutical Inc. | call | New | 500 | $1.5M |
| CDTX Cidara Therapeutics Inc. | call | New | 49 | $469K |
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 |