Atika Capital Management LLC
In its 13F for Q2 2025 (holdings as of June 30, 2025, filed August 13, 2025), Atika Capital Management LLC reported 57 stock positions worth $957.3 million. Its top holding was Amazon.com (AMZN) at 9.1% of the portfolio, followed by Vertiv Class A (VRT, 8.2%) and Microsoft (MSFT, 8.2%). Compared with Q1 2025, it opened 15 new positions, sold out of 11, added to 25 and reduced 15. The biggest buy was Vertiv Class A (VRT, shares +26%) and the biggest sale Rxsight (RXST, shares −31%).
- Most Recent 13F
- Q2 2026
- Location
- NEW YORK, NY
- CIK
- 0001599731
- Portfolio Value
- $957.3M (Q2 2025)
- SEC Filing
- 0001214659-25-011890 ↗ filed Aug 13, 2025
Holdings Value
Holdings 57 stocks · $957.3M
| AMZN Amazon.com Inc. | 9.13% | 398,249 | $87.4M | Add +27.1% |
| VRT Vertiv Holdings Co. Class A | 8.22% | 613,100 | $78.7M | Add +25.9% |
| MSFT Microsoft Corp. | 8.21% | 158,000 | $78.6M | Add +47.0% |
| SPOT Spotify Technology SA | 5.01% | 62,520 | $48.0M | Add +1.2% |
| MLM Martin Marietta Materials | 4.16% | 72,533 | $39.8M | Add +30.4% |
| GKOS Glaukos Corp. | 3.45% | 319,500 | $33.0M | Add +21.3% |
| ISRG Intuitive Surgical Inc. | 3.38% | 59,600 | $32.4M | Add +8.2% |
| LLY Eli Lilly & Co. | 3.35% | 41,100 | $32.0M | Add +24.2% |
| CEG Constellation Energy | 3.20% | 94,800 | $30.6M | Add +129.5% |
| BWXT BWX Technologies Inc. | 3.17% | 210,400 | $30.3M | Add +95.9% |
| META Meta Platforms Inc. Class A | 2.93% | 38,000 | $28.0M | Add +100.0% |
| ANET Arista Networks Inc. | 2.80% | 261,608 | $26.8M | Add +22.3% |
| MELI MercadoLibre Inc. | 2.73% | 10,000 | $26.1M | Add +26.1% |
| VST Vistra Corp. | 2.51% | 124,000 | $24.0M | Add +6.9% |
| GEV GE Vernova Inc. | 2.35% | 42,550 | $22.5M | Add +13.6% |
| INSP Inspire Medical Systems Inc. | 2.19% | 161,900 | $21.0M | Add +0.8% |
| HOOD Robinhood Markets Inc. Class A | 2.13% | 218,100 | $20.4M | Add +52.5% |
| VRNA Verona Pharma Ltd. | 2.10% | 212,500 | $20.1M | Add +2.1% |
| TLN Talen Energy Corp. | 1.82% | 59,800 | $17.4M | Reduce -17.1% |
| DASH DoorDash Inc. Class A | 1.71% | 66,400 | $16.4M | Reduce -19.8% |
| NFLX Netflix Inc. | 1.68% | 12,000 | $16.1M | Reduce -25.9% |
| CYBR Cyberark Software Ltd./Israel | 1.65% | 38,855 | $15.8M | Reduce -9.0% |
| NET Cloudflare Inc. Class A | 1.41% | 68,801 | $13.5M | Add +91.1% |
| RBLX Roblox Corp. Class A | 1.20% | 109,000 | $11.5M | New |
| APPF Appfolio Inc. Class A | 1.07% | 44,500 | $10.2M | No change |
| SLNO Soleno Therapeutics Inc. | 1.05% | 120,500 | $10.1M | Add +19.8% |
| EYE National Vision Holdings Inc. | 1.00% | 414,200 | $9.5M | New |
| NVDA Nvidia Corp. | 0.97% | 58,800 | $9.3M | Add +13.1% |
| ALNY Alnylam Pharmaceuticals Inc. | 0.94% | 27,700 | $9.0M | New |
| DUOL Duolingo | 0.90% | 21,100 | $8.7M | Reduce -9.4% |
| ADBE Adobe Inc. | 0.90% | 22,298 | $8.6M | Add +4.2% |
| SN Sharkninja Inc. | 0.88% | 85,500 | $8.5M | New |
| MTZ Mastec Inc. | 0.88% | 49,200 | $8.4M | New |
| GE General Electric filed as GE AEROSPACE | 0.85% | 31,441 | $8.1M | Reduce -35.2% |
| SHOP Shopify Inc. Class A | 0.84% | 69,400 | $8.0M | Add +39.5% |
| NTRA Natera Inc. | 0.82% | 46,497 | $7.9M | Reduce -35.1% |
| TW Tradeweb Markets Inc. Class A | 0.76% | 50,000 | $7.3M | Add +34.2% |
| WWD Woodward Inc. | 0.73% | 28,600 | $7.0M | New |
| KYMR Kymera Therapeutics Inc. | 0.67% | 146,600 | $6.4M | New |
| FERG Ferguson Enterprises Inc. | 0.67% | 29,300 | $6.4M | No change |
| CW Curtiss-Wright Corp. | 0.59% | 11,500 | $5.6M | New |
| SPNT Siriuspoint Ltd. | 0.57% | 269,300 | $5.5M | Reduce -35.9% |
| AXSM Axsome Therapeutics Inc. | 0.50% | 46,121 | $4.8M | Reduce -37.4% |
| TKO Tko Group Holdings Inc. | 0.50% | 26,200 | $4.8M | Reduce -16.3% |
| GH Guardant Health Inc. | 0.48% | 89,200 | $4.6M | Add +4.3% |
| RXST Rxsight Inc. | 0.48% | 354,907 | $4.6M | Reduce -30.8% |
| TBBB BBB Foods Inc. Class A | 0.47% | 161,544 | $4.5M | Reduce -11.6% |
| ROKU Roku Inc. | 0.41% | 44,600 | $3.9M | Reduce -38.2% |
| NBIS Nebius Group NV | 0.40% | 69,500 | $3.8M | New |
| ASND Ascendis Pharma A/S | 0.30% | 16,400 | $2.8M | Reduce -53.4% |
| TSM Taiwan Semiconductor-SP ADR | 0.24% | 10,000 | $2.3M | New |
| HNGE Hinge Health Inc. Class A | 0.24% | 43,700 | $2.3M | New |
| NOVT Novanta Inc. | 0.14% | 10,600 | $1.4M | New |
| WRBY Warby Parker Inc. Class A | 0.10% | 44,800 | $982K | New |
| ECHO Echostar Corp. Class A | 0.07% | 24,200 | $670K | Reduce -88.1% |
| CAI Caris Life Sciences Inc. | 0.07% | 25,000 | $668K | New |
| STAA Staar Surgical Co. | 0.03% | 16,400 | $275K | New |
Options reported separately and not counted above: ECHO calls ($12.1M), AMZN calls ($11.0M), UBER calls ($9.3M), MDT calls ($6.3M), FND calls ($2.3M), WBA puts ($1.7M).
Portfolio Sells Q1 2025 → Q2 2025
| RXST Rxsight Inc. | Reduce -30.8% | 0.48% | −1.51 |
| TARS Tarsus Pharmaceuticals Inc. | Sold out | 0.00% | −1.14 |
| INSM Insmed Inc. | Sold out | 0.00% | −1.12 |
| EMBJ Embraer SA-Spon ADR | Sold out | 0.00% | −1.06 |
| TEVA Teva Pharmaceutical-SP ADR | Sold out | 0.00% | −1.03 |
| AXSM Axsome Therapeutics Inc. | Reduce -37.4% | 0.50% | −0.82 |
| SHW The Sherwin-Williams Co. | Sold out | 0.00% | −0.78 |
| NTRA Natera Inc. | Reduce -35.1% | 0.82% | −0.74 |
| ECHO Echostar Corp. Class A | Reduce -88.1% | 0.07% | −0.73 |
| CHKP Check Point Software Tech | Sold out | 0.00% | −0.70 |
| GAP The Gap Inc. | Sold out | 0.00% | −0.68 |
| LNTH Lantheus Holdings Inc. | Sold out | 0.00% | −0.68 |
| GE General Electric | Reduce -35.2% | 0.85% | −0.65 |
| NFLX Netflix Inc. | Reduce -25.9% | 1.68% | −0.64 |
| DASH DoorDash Inc. Class A | Reduce -19.8% | 1.71% | −0.61 |
| CYBR Cyberark Software Ltd./Israel | Reduce -9.0% | 1.65% | −0.56 |
| ASND Ascendis Pharma A/S | Reduce -53.4% | 0.30% | −0.55 |
| SPNT Siriuspoint Ltd. | Reduce -35.9% | 0.57% | −0.54 |
| TLN Talen Energy Corp. | Reduce -17.1% | 1.82% | −0.40 |
| ROKU Roku Inc. | Reduce -38.2% | 0.41% | −0.37 |
| TBBB BBB Foods Inc. Class A | Reduce -11.6% | 0.47% | −0.28 |
| TKO Tko Group Holdings Inc. | Reduce -16.3% | 0.50% | −0.24 |
| DUOL Duolingo | Reduce -9.4% | 0.90% | −0.21 |
| VMC Vulcan Materials Co. | Sold out | 0.00% | −0.17 |
| XENE Xenon Pharmaceuticals Inc. | Sold out | 0.00% | −0.12 |
| SFM Sprouts Farmers Market Inc. | Sold out | 0.00% | −0.11 |
Portfolio Buys Q1 2025 → Q2 2025
| VRT Vertiv Holdings Co. Class A | Add +25.9% | 8.22% | +2.82 |
| MSFT Microsoft Corp. | Add +47.0% | 8.21% | +2.01 |
| CEG Constellation Energy | Add +129.5% | 3.20% | +1.92 |
| BWXT BWX Technologies Inc. | Add +95.9% | 3.17% | +1.54 |
| META Meta Platforms Inc. Class A | Add +100.0% | 2.93% | +1.25 |
| HOOD Robinhood Markets Inc. Class A | Add +52.5% | 2.13% | +1.22 |
| RBLX Roblox Corp. Class A | New | 1.20% | +1.20 |
| EYE National Vision Holdings Inc. | New | 1.00% | +1.00 |
| ALNY Alnylam Pharmaceuticals Inc. | New | 0.94% | +0.94 |
| SN Sharkninja Inc. | New | 0.88% | +0.88 |
| MTZ Mastec Inc. | New | 0.88% | +0.88 |
| NET Cloudflare Inc. Class A | Add +91.1% | 1.41% | +0.78 |
| WWD Woodward Inc. | New | 0.73% | +0.73 |
| KYMR Kymera Therapeutics Inc. | New | 0.67% | +0.67 |
| GEV GE Vernova Inc. | Add +13.6% | 2.35% | +0.60 |
| CW Curtiss-Wright Corp. | New | 0.59% | +0.59 |
| VST Vistra Corp. | Add +6.9% | 2.51% | +0.42 |
| NBIS Nebius Group NV | New | 0.40% | +0.40 |
| MELI MercadoLibre Inc. | Add +26.1% | 2.73% | +0.36 |
| ANET Arista Networks Inc. | Add +22.3% | 2.80% | +0.25 |
| TSM Taiwan Semiconductor-SP ADR | New | 0.24% | +0.24 |
| HNGE Hinge Health Inc. Class A | New | 0.24% | +0.24 |
| NOVT Novanta Inc. | New | 0.14% | +0.14 |
| SHOP Shopify Inc. Class A | Add +39.5% | 0.84% | +0.11 |
| NVDA Nvidia Corp. | Add +13.1% | 0.97% | +0.11 |
| WRBY Warby Parker Inc. Class A | New | 0.10% | +0.10 |
| MLM Martin Marietta Materials | Add +30.4% | 4.16% | +0.08 |
| VRNA Verona Pharma Ltd. | Add +2.1% | 2.10% | +0.07 |
| CAI Caris Life Sciences Inc. | New | 0.07% | +0.07 |
| STAA Staar Surgical Co. | New | 0.03% | +0.03 |
| AMZN Amazon.com Inc. | Add +27.1% | 9.13% | −0.02 |
| SLNO Soleno Therapeutics Inc. | Add +19.8% | 1.05% | −0.05 |
| GH Guardant Health Inc. | Add +4.3% | 0.48% | −0.07 |
| TW Tradeweb Markets Inc. Class A | Add +34.2% | 0.76% | −0.08 |
| SPOT Spotify Technology SA | Add +1.2% | 5.01% | −0.21 |
| ADBE Adobe Inc. | Add +4.2% | 0.90% | −0.36 |
| GKOS Glaukos Corp. | Add +21.3% | 3.45% | −0.53 |
| ISRG Intuitive Surgical Inc. | Add +8.2% | 3.38% | −0.81 |
| LLY Eli Lilly & Co. | Add +24.2% | 3.35% | −0.85 |
| INSP Inspire Medical Systems Inc. | Add +0.8% | 2.19% | −1.73 |
Options Activity Q1 2025 → Q2 2025
| IWM iShares Russell 2000 ETF | call | Sold out | 1,500 | $29.9Mbefore exit |
| ECHO Echostar Corp. Class A | call | New | 4,370 | $12.1M |
| AMZN Amazon.com Inc. | call | New | 500 | $11.0M |
| UBER Uber Technologies Inc. | call | New | 1,000 | $9.3M |
| TSLA Tesla Inc. | put | Sold out | 300 | $7.8Mbefore exit |
| LNTH Lantheus Holdings Inc. | put | Sold out | 750 | $7.3Mbefore exit |
| MDT Medtronic PLC | call | New | 720 | $6.3M |
| SLNO Soleno Therapeutics Inc. | call | Sold out | 650 | $4.6Mbefore exit |
| MU Micron Technology Inc. | call | Sold out | 400 | $3.5Mbefore exit |
| DOCS Doximity Inc. Class A | call | Sold out | 500 | $2.9Mbefore exit |
| FND Floor & Decor Holdings Inc. Class A | call | New | 300 | $2.3M |
| RXST Rxsight Inc. | call | Sold out | 500 | $1.3Mbefore exit |
| CLS Celestica Inc. | call | Sold out | 100 | $788Kbefore 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 |