Atika Capital Management LLC
In its 13F for Q4 2025 (holdings as of December 31, 2025, filed February 13, 2026), Atika Capital Management LLC reported 64 stock positions worth $718.1 million. Its top holding was Vertiv Class A (VRT) at 14.4% of the portfolio, followed by Eli Lilly (LLY, 6.2%) and Intuitive Surgical (ISRG, 4.5%). Compared with Q3 2025, it opened 26 new positions, sold out of 38, added to 14 and reduced 20. The biggest buy was Vertiv Class A (VRT, shares +4%) and the biggest sale an exit from Microsoft (MSFT).
- Most Recent 13F
- Q2 2026
- Location
- NEW YORK, NY
- CIK
- 0001599731
- Portfolio Value
- $718.1M (Q4 2025)
- SEC Filing
- 0001214659-26-001658 ↗ filed Feb 13, 2026
Holdings Value
Holdings 64 stocks · $718.1M
| VRT Vertiv Holdings Co. Class A | 14.35% | 636,100 | $103.1M | Add +3.8% |
| LLY Eli Lilly & Co. | 6.15% | 41,100 | $44.2M | No change |
| ISRG Intuitive Surgical Inc. | 4.51% | 57,216 | $32.4M | Reduce -0.0% |
| TEVA Teva Pharmaceutical-SP ADR | 3.12% | 717,000 | $22.4M | Add +220.1% |
| SHOP Shopify Inc. Class A | 2.78% | 124,000 | $20.0M | Add +58.0% |
| MDGL Madrigal Pharmaceuticals Inc. | 2.76% | 34,000 | $19.8M | New |
| BWXT BWX Technologies Inc. | 2.62% | 108,900 | $18.8M | Reduce -49.9% |
| AMZN Amazon.com Inc. | 2.57% | 80,000 | $18.5M | Reduce -79.8% |
| COGT Cogent Biosciences Inc. | 2.50% | 506,000 | $18.0M | New |
| NFLX Netflix Inc. | 2.35% | 180,000 | $16.9M | No change |
| TLN Talen Energy Corp. | 2.20% | 42,100 | $15.8M | Reduce -39.3% |
| STX Seagate Technology Holdings | 1.99% | 51,907 | $14.3M | Reduce -56.0% |
| CIEN Ciena Corp. | 1.95% | 60,000 | $14.0M | Reduce -25.0% |
| ECHO Echostar Corp. Class A | 1.89% | 124,806 | $13.6M | Add +80.9% |
| TSLA Tesla Inc. | 1.88% | 30,000 | $13.5M | Reduce -3.2% |
| INSM Insmed Inc. | 1.87% | 77,200 | $13.4M | Reduce -18.7% |
| GOOG Alphabet Inc. Class C | 1.84% | 42,200 | $13.2M | New |
| TERN Terns Pharmaceuticals Inc. | 1.81% | 321,165 | $13.0M | New |
| MTZ Mastec Inc. | 1.70% | 55,998 | $12.2M | Add +41.8% |
| MELI MercadoLibre Inc. | 1.67% | 5,947 | $12.0M | Reduce -25.0% |
| GH Guardant Health Inc. | 1.54% | 108,000 | $11.0M | Reduce -18.8% |
| NET Cloudflare Inc. Class A | 1.51% | 54,900 | $10.8M | Reduce -44.0% |
| FIVE Five Below | 1.47% | 56,200 | $10.6M | Add +23.5% |
| DASH DoorDash Inc. Class A | 1.45% | 46,000 | $10.4M | Reduce -27.2% |
| APPF Appfolio Inc. Class A | 1.44% | 44,500 | $10.4M | No change |
| AXSM Axsome Therapeutics Inc. | 1.41% | 55,500 | $10.1M | Add +13.3% |
| MDB Mongodb Inc. | 1.30% | 22,326 | $9.4M | New |
| REAL The Realreal Inc. filed as THE REALREAL INC | 1.24% | 565,000 | $8.9M | Add +51.1% |
| HEI Heico Corp. | 1.19% | 26,300 | $8.5M | New |
| LMND Lemonade Inc. | 1.13% | 113,917 | $8.1M | Add +65.1% |
| QXO Qxo Inc. | 1.13% | 420,000 | $8.1M | New |
| CSL Carlisle Cos Inc. | 1.13% | 25,300 | $8.1M | New |
| GE General Electric filed as GE AEROSPACE | 1.11% | 25,948 | $8.0M | Reduce -21.4% |
| PTGX Protagonist Therapeutics Inc. | 1.05% | 86,000 | $7.5M | Add +3.6% |
| EMBJ Embraer SA-Spon ADR | 1.04% | 115,930 | $7.5M | New |
| ABVX Abivax SA-ADR | 1.03% | 55,000 | $7.4M | Reduce -20.3% |
| IMNM Immunome Inc. | 1.00% | 334,341 | $7.2M | New |
| TTMI TTM Technologies | 0.97% | 101,473 | $7.0M | New |
| ROKU Roku Inc. | 0.92% | 61,000 | $6.6M | Reduce -54.1% |
| FERG Ferguson Enterprises Inc. | 0.91% | 29,300 | $6.5M | No change |
| RH RH | 0.87% | 35,000 | $6.3M | New |
| SN Sharkninja Inc. | 0.82% | 52,600 | $5.9M | Add +31.5% |
| HOOD Robinhood Markets Inc. Class A | 0.81% | 51,500 | $5.8M | Reduce -57.4% |
| DNTH Dianthus Therapeutics Inc. | 0.77% | 134,528 | $5.5M | New |
| CW Curtiss-Wright Corp. | 0.76% | 9,882 | $5.4M | Reduce -1.7% |
| WRBY Warby Parker Inc. Class A | 0.76% | 248,971 | $5.4M | New |
| MDLN Medline Inc. Class A | 0.69% | 117,800 | $4.9M | New |
| TBBB BBB Foods Inc. Class A | 0.66% | 142,282 | $4.8M | Reduce -10.5% |
| FIGR Figure Technology Solut Class A | 0.63% | 111,447 | $4.6M | Add +106.4% |
| BBWI Bath & Body Works Inc. | 0.63% | 225,000 | $4.5M | New |
| ASND Ascendis Pharma A/S | 0.61% | 20,642 | $4.4M | Reduce -6.8% |
| RKLB Rocket Lab Corp. | 0.60% | 62,115 | $4.3M | New |
| XENE Xenon Pharmaceuticals Inc. | 0.58% | 92,506 | $4.1M | Add +143.4% |
| ALNY Alnylam Pharmaceuticals Inc. | 0.57% | 10,339 | $4.1M | Reduce -53.4% |
| DBVT DBV Technologies SA-Spon ADR | 0.55% | 206,881 | $4.0M | New |
| KNSA Kiniksa Pharmaceuticals Inte | 0.54% | 93,970 | $3.9M | New |
| IONS Ionis Pharmaceuticals Inc. | 0.52% | 47,488 | $3.8M | Add +120.9% |
| ANF Abercrombie & Fitch Co. Class A | 0.51% | 29,000 | $3.7M | New |
| RAPT Rapt Therapeutics Inc. | 0.44% | 94,245 | $3.2M | New |
| AAOI Applied Optoelectronics Inc. | 0.43% | 87,657 | $3.1M | New |
| RKT Rocket Cos Inc. Class A | 0.35% | 130,000 | $2.5M | New |
| CECO Ceco Environmental Corp. | 0.25% | 29,804 | $1.8M | New |
| CLH Clean Harbors Inc. | 0.10% | 3,000 | $703K | New |
| RDDT Reddit Inc. Class A | 0.06% | 2,000 | $460K | New |
Options reported separately and not counted above: XBI puts ($117.4M), ECHO calls ($43.3M), IWM puts ($22.4M), TEVA calls ($9.4M), HOOD puts ($7.9M), IBIT puts ($7.4M), FND calls ($4.9M), RIVN calls ($4.8M), EEM calls ($4.5M), EOSE calls ($4.3M), MRNA puts ($2.2M), U calls ($2.2M), and 1 more.
Portfolio Sells Q3 2025 → Q4 2025
| MSFT Microsoft Corp. | Sold out | 0.00% | −7.28 |
| AMZN Amazon.com Inc. | Reduce -79.8% | 2.57% | −4.86 |
| SPOT Spotify Technology SA | Sold out | 0.00% | −3.74 |
| MLM Martin Marietta Materials | Sold out | 0.00% | −3.68 |
| ANET Arista Networks Inc. | Sold out | 0.00% | −2.87 |
| CEG Constellation Energy | Sold out | 0.00% | −2.66 |
| GEV GE Vernova Inc. | Sold out | 0.00% | −2.22 |
| META Meta Platforms Inc. Class A | Sold out | 0.00% | −2.22 |
| VST Vistra Corp. | Sold out | 0.00% | −2.05 |
| CYBR Cyberark Software Ltd./Israel | Sold out | 0.00% | −1.85 |
| NBIS Nebius Group NV | Sold out | 0.00% | −1.72 |
| RBLX Roblox Corp. Class A | Sold out | 0.00% | −1.68 |
| VRNA Verona Pharma Ltd. | Sold out | 0.00% | −1.60 |
| GKOS Glaukos Corp. | Sold out | 0.00% | −1.48 |
| CDTX Cidara Therapeutics Inc. | Sold out | 0.00% | −1.28 |
| INSP Inspire Medical Systems Inc. | Sold out | 0.00% | −1.19 |
| NVDA Nvidia Corp. | Sold out | 0.00% | −1.17 |
| ADBE Adobe Inc. | Sold out | 0.00% | −1.16 |
| BWXT BWX Technologies Inc. | Reduce -49.9% | 2.62% | −0.79 |
| EYE National Vision Holdings Inc. | Sold out | 0.00% | −0.75 |
| ASML ASML Holding NV-NY Reg SHS | Sold out | 0.00% | −0.72 |
| HOOD Robinhood Markets Inc. Class A | Reduce -57.4% | 0.81% | −0.66 |
| NTRA Natera Inc. | Sold out | 0.00% | −0.64 |
| DHI D.R. Horton Inc. | Sold out | 0.00% | −0.64 |
| DUOL Duolingo | Sold out | 0.00% | −0.61 |
| MLYS Mineralys Therapeutics Inc. | Sold out | 0.00% | −0.56 |
| CALX Calix Inc. | Sold out | 0.00% | −0.47 |
| QURE Uniqure NV | Sold out | 0.00% | −0.45 |
| GNRC Generac Holdings Inc. | Sold out | 0.00% | −0.44 |
| SPNT Siriuspoint Ltd. | Sold out | 0.00% | −0.40 |
| KYMR Kymera Therapeutics Inc. | Sold out | 0.00% | −0.39 |
| STX Seagate Technology Holdings | Reduce -56.0% | 1.99% | −0.38 |
| AVGO Broadcom Inc. | Sold out | 0.00% | −0.32 |
| TLN Talen Energy Corp. | Reduce -39.3% | 2.20% | −0.31 |
| ALNY Alnylam Pharmaceuticals Inc. | Reduce -53.4% | 0.57% | −0.29 |
| NET Cloudflare Inc. Class A | Reduce -44.0% | 1.51% | −0.28 |
| U Unity Software Inc. | Sold out | 0.00% | −0.27 |
| RXST Rxsight Inc. | Sold out | 0.00% | −0.27 |
| NTSK Netskope Inc. Class A | Sold out | 0.00% | −0.22 |
| ROKU Roku Inc. | Reduce -54.1% | 0.92% | −0.21 |
| HTFL Heartflow Inc. | Sold out | 0.00% | −0.20 |
| FND Floor & Decor Holdings Inc. Class A | Sold out | 0.00% | −0.19 |
| ZURA Zura Bio Ltd. | Sold out | 0.00% | −0.10 |
| IBM Intl Business Machines Corp. | Sold out | 0.00% | −0.07 |
| CAI Caris Life Sciences Inc. | Sold out | 0.00% | −0.06 |
| STAA Staar Surgical Co. | Sold out | 0.00% | −0.04 |
| DASH DoorDash Inc. Class A | Reduce -27.2% | 1.45% | −0.01 |
| MELI MercadoLibre Inc. | Reduce -25.0% | 1.67% | +0.09 |
| ASND Ascendis Pharma A/S | Reduce -6.8% | 0.61% | +0.24 |
| GE General Electric | Reduce -21.4% | 1.11% | +0.27 |
Portfolio Buys Q3 2025 → Q4 2025
| VRT Vertiv Holdings Co. Class A | Add +3.8% | 14.35% | +6.47 |
| MDGL Madrigal Pharmaceuticals Inc. | New | 2.76% | +2.76 |
| TEVA Teva Pharmaceutical-SP ADR | Add +220.1% | 3.12% | +2.73 |
| COGT Cogent Biosciences Inc. | New | 2.50% | +2.50 |
| GOOG Alphabet Inc. Class C | New | 1.84% | +1.84 |
| TERN Terns Pharmaceuticals Inc. | New | 1.81% | +1.81 |
| SHOP Shopify Inc. Class A | Add +58.0% | 2.78% | +1.79 |
| ECHO Echostar Corp. Class A | Add +80.9% | 1.89% | +1.44 |
| MDB Mongodb Inc. | New | 1.30% | +1.30 |
| HEI Heico Corp. | New | 1.19% | +1.19 |
| QXO Qxo Inc. | New | 1.13% | +1.13 |
| CSL Carlisle Cos Inc. | New | 1.13% | +1.13 |
| EMBJ Embraer SA-Spon ADR | New | 1.04% | +1.04 |
| IMNM Immunome Inc. | New | 1.00% | +1.00 |
| MTZ Mastec Inc. | Add +41.8% | 1.70% | +0.98 |
| TTMI TTM Technologies | New | 0.97% | +0.97 |
| AXSM Axsome Therapeutics Inc. | Add +13.3% | 1.41% | +0.90 |
| REAL The Realreal Inc. | Add +51.1% | 1.24% | +0.90 |
| FIVE Five Below | Add +23.5% | 1.47% | +0.87 |
| RH RH | New | 0.87% | +0.87 |
| LMND Lemonade Inc. | Add +65.1% | 1.13% | +0.81 |
| DNTH Dianthus Therapeutics Inc. | New | 0.77% | +0.77 |
| WRBY Warby Parker Inc. Class A | New | 0.76% | +0.76 |
| MDLN Medline Inc. Class A | New | 0.69% | +0.69 |
| BBWI Bath & Body Works Inc. | New | 0.63% | +0.63 |
| RKLB Rocket Lab Corp. | New | 0.60% | +0.60 |
| PTGX Protagonist Therapeutics Inc. | Add +3.6% | 1.05% | +0.58 |
| DBVT DBV Technologies SA-Spon ADR | New | 0.55% | +0.55 |
| KNSA Kiniksa Pharmaceuticals Inte | New | 0.54% | +0.54 |
| ANF Abercrombie & Fitch Co. Class A | New | 0.51% | +0.51 |
| SN Sharkninja Inc. | Add +31.5% | 0.82% | +0.47 |
| FIGR Figure Technology Solut Class A | Add +106.4% | 0.63% | +0.47 |
| XENE Xenon Pharmaceuticals Inc. | Add +143.4% | 0.58% | +0.45 |
| RAPT Rapt Therapeutics Inc. | New | 0.44% | +0.44 |
| AAOI Applied Optoelectronics Inc. | New | 0.43% | +0.43 |
| IONS Ionis Pharmaceuticals Inc. | Add +120.9% | 0.52% | +0.40 |
| RKT Rocket Cos Inc. Class A | New | 0.35% | +0.35 |
| CECO Ceco Environmental Corp. | New | 0.25% | +0.25 |
| CLH Clean Harbors Inc. | New | 0.10% | +0.10 |
| RDDT Reddit Inc. Class A | New | 0.06% | +0.06 |
Options Activity Q3 2025 → Q4 2025
| XBI SS SPDR S&P Biotech ETF | put | New | 9,625 | $117.4M |
| IWM iShares Russell 2000 ETF | put | New | 910 | $22.4M |
| KVUE Kenvue Inc. | call | Sold out | 5,785 | $9.4Mbefore exit |
| TEVA Teva Pharmaceutical-SP ADR | call | New | 3,000 | $9.4M |
| HOOD Robinhood Markets Inc. Class A | put | New | 700 | $7.9M |
| IBIT iShares Bitcoin Trust ETF | put | New | 1,500 | $7.4M |
| STX Seagate Technology Holdings | call | Sold out | 234 | $5.5Mbefore exit |
| RIVN Rivian Automotive Inc. Class A | call | New | 2,420 | $4.8M |
| EEM iShares MSCI Emerging Market | call | New | 816 | $4.5M |
| EOSE Eos Energy Enterprises Inc. | call | New | 3,720 | $4.3M |
| KMLM Kraneshares MT LC MN FT Id S | call | Sold out | 1,000 | $4.2Mbefore exit |
| AI C3.AI Inc. Class A | put | Sold out | 2,103 | $3.6Mbefore exit |
| MRNA Moderna Inc. | put | New | 760 | $2.2M |
| U Unity Software Inc. | call | Reduce -61.5% | 500 | $2.2M |
| INFY Infosys Ltd.-SP ADR | put | Sold out | 1,000 | $1.6Mbefore exit |
| RARE Ultragenyx Pharmaceutical Inc. | call | Sold out | 500 | $1.5Mbefore 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 | 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 |