Atika Capital Management LLC's Q2 2025 13F: 15 new positions, 11 exits
Form 13F-HR for the quarter ended Jun 30, 2025 · filed Aug 13, 2025 · 57 reported positions · accession 0001214659-25-011890
What changed this quarter
| Activity | Security | Weight before | Weight now | Change | Shares | Shares % |
|---|---|---|---|---|---|---|
| Increased | MICROSOFT CORP (MSFT) | 6.2% | 8.2% | +2.0 pts | +50,500 sh | +47% |
| Increased | AMAZON COM INC (AMZN) | 9.2% | 9.1% | 0.0 pts | +85,000 sh | +27% |
| Increased | CONSTELLATION ENERGY CORP (CEG) | 1.3% | 3.2% | +1.9 pts | +53,500 sh | +130% |
| Increased | VERTIV HOLDINGS CO (VRT) | 5.4% | 8.2% | +2.8 pts | +126K sh | +26% |
| Increased | BWX TECHNOLOGIES INC (BWXT) | 1.6% | 3.2% | +1.5 pts | +103K sh | +96% |
| Increased | META PLATFORMS INC (META) | 1.7% | 2.9% | +1.2 pts | +18,999 sh | +100% |
| New | ROBLOX CORP (RBLX) | — | 1.2% | +1.2 pts | +109K sh | new |
| Exited | TARSUS PHARMACEUTICALS INC (TARS) | 1.1% | — | −1.1 pts | −144K sh | −100% |
| Exited | INSMED INC (INSM) | 1.1% | — | −1.1 pts | −96,000 sh | −100% |
| Exited | EMBRAER S.A. (EMBJ) | 1.1% | — | −1.1 pts | −149K sh | −100% |
| Exited | TEVA PHARMACEUTICAL INDS LTD (TEVA) | 1.0% | — | −1.0 pts | −437K sh | −100% |
| New | NATIONAL VISION HLDGS INC (EYE) | — | 1.0% | +1.0 pts | +414K sh | new |
| Increased | MARTIN MARIETTA MATLS INC (MLM) | 4.1% | 4.2% | +0.1 pts | +16,900 sh | +30% |
| New | ALNYLAM PHARMACEUTICALS INC (ALNY) | — | 0.9% | +0.9 pts | +27,700 sh | new |
| New | SHARKNINJA INC (SN) | — | 0.9% | +0.9 pts | +85,500 sh | new |
| New | MASTEC INC (MTZ) | — | 0.9% | +0.9 pts | +49,200 sh | new |
| Exited | SHERWIN WILLIAMS CO (SHW) | 0.8% | — | −0.8 pts | −14,581 sh | −100% |
| Increased | ROBINHOOD MKTS INC (HOOD) | 0.9% | 2.1% | +1.2 pts | +75,100 sh | +53% |
| New | WOODWARD INC (WWD) | — | 0.7% | +0.7 pts | +28,600 sh | new |
| Exited | CHECK POINT SOFTWARE TECH LT (CHKP) | 0.7% | — | −0.7 pts | −20,000 sh | −100% |
| Exited | GAP INC (GAP) | 0.7% | — | −0.7 pts | −214K sh | −100% |
| Exited | LANTHEUS HLDGS INC (LNTH) | 0.7% | — | −0.7 pts | −45,100 sh | −100% |
| Increased | CLOUDFLARE INC (NET) | 0.6% | 1.4% | +0.8 pts | +32,801 sh | +91% |
| New | KYMERA THERAPEUTICS INC (KYMR) | — | 0.7% | +0.7 pts | +147K sh | new |
| Increased | ELI LILLY & CO (LLY) | 4.2% | 3.3% | −0.9 pts | +8,000 sh | +24% |
| Increased | GLAUKOS CORP (GKOS) | 4.0% | 3.4% | −0.5 pts | +56,000 sh | +21% |
| Reduced | NETFLIX INC (NFLX) | 2.3% | 1.7% | −0.6 pts | −4,200 sh | −26% |
| New | CURTISS WRIGHT CORP (CW) | — | 0.6% | +0.6 pts | +11,500 sh | new |
| Increased | MERCADOLIBRE INC (MELI) | 2.4% | 2.7% | +0.4 pts | +2,071 sh | +26% |
| Reduced | ECHOSTAR CORP (SATS) | 0.8% | 0.1% | −0.7 pts | −179K sh | −88% |
| Increased | ARISTA NETWORKS INC (ANET) | 2.5% | 2.8% | +0.3 pts | +47,620 sh | +22% |
| Reduced | GE AEROSPACE (GE) | 1.5% | 0.8% | −0.6 pts | −17,059 sh | −35% |
| Reduced | NATERA INC (NTRA) | 1.6% | 0.8% | −0.7 pts | −25,166 sh | −35% |
| Reduced | DOORDASH INC (DASH) | 2.3% | 1.7% | −0.6 pts | −16,385 sh | −20% |
| New | NEBIUS GROUP N.V. (NBIS) | — | 0.4% | +0.4 pts | +69,500 sh | new |
| Reduced | TALEN ENERGY CORP (TLN) | 2.2% | 1.8% | −0.4 pts | −12,360 sh | −17% |
| Reduced | ASCENDIS PHARMA A/S (ASND) | 0.8% | 0.3% | −0.5 pts | −18,800 sh | −53% |
| Reduced | SIRIUSPOINT LTD (SPNT) | 1.1% | 0.6% | −0.5 pts | −151K sh | −36% |
| Reduced | AXSOME THERAPEUTICS INC (AXSM) | 1.3% | 0.5% | −0.8 pts | −27,579 sh | −37% |
| Increased | GE VERNOVA INC (GEV) | 1.8% | 2.4% | +0.6 pts | +5,100 sh | +14% |
| Increased | INTUITIVE SURGICAL INC (ISRG) | 4.2% | 3.4% | −0.8 pts | +4,500 sh | +8% |
| Reduced | ROKU INC (ROKU) | 0.8% | 0.4% | −0.4 pts | −27,600 sh | −38% |
| New | TAIWAN SEMICONDUCTOR MFG LTD (TSM) | — | 0.2% | +0.2 pts | +10,000 sh | new |
| Increased | SHOPIFY INC (SHOP) | 0.7% | 0.8% | +0.1 pts | +19,633 sh | +39% |
| New | HINGE HEALTH INC (HNGE) | — | 0.2% | +0.2 pts | +43,700 sh | new |
| Reduced | RXSIGHT INC (RXST) | 2.0% | 0.5% | −1.5 pts | −158K sh | −31% |
| Increased | TRADEWEB MKTS INC (TW) | 0.8% | 0.8% | −0.1 pts | +12,744 sh | +34% |
| Increased | SOLENO THERAPEUTICS INC (SLNO) | 1.1% | 1.1% | 0.0 pts | +19,900 sh | +20% |
| Exited | VULCAN MATLS CO (VMC) | 0.2% | — | −0.2 pts | −4,800 sh | −100% |
| Reduced | CYBERARK SOFTWARE LTD (CYBR) | 2.2% | 1.7% | −0.6 pts | −3,845 sh | −9% |
The 50 largest of 66 changes, by size of the trade. Full holdings for this quarter.
Reported by the fund in its Form 13F filed with the SEC; holdings are as of the quarter-end report date and may have changed since. For informational purposes only — not investment advice or a recommendation to buy or sell any security. FilingExplorer is not affiliated with or endorsed by this fund. How this brief is compiled
Top 10 positions — 51.3% of the equity book
Changes in the top 10 this quarter: CEG entered · BWXT entered · INSP left · ANET left
| # | Security | Weight before | Weight now | |
|---|---|---|---|---|
| 1 | AMAZON COM INC (AMZN) | 9.2% | 9.1% | |
| 2 | VERTIV HOLDINGS CO (VRT) | 5.4% | 8.2% | |
| 3 | MICROSOFT CORP (MSFT) | 6.2% | 8.2% | |
| 4 | SPOTIFY TECHNOLOGY S A (SPOT) | 5.2% | 5.0% | |
| 5 | MARTIN MARIETTA MATLS INC (MLM) | 4.1% | 4.2% | |
| 6 | GLAUKOS CORP (GKOS) | 4.0% | 3.4% | |
| 7 | INTUITIVE SURGICAL INC (ISRG) | 4.2% | 3.4% | |
| 8 | ELI LILLY & CO (LLY) | 4.2% | 3.3% | |
| 9 | CONSTELLATION ENERGY CORP (CEG) | 1.3% | 3.2% | Entered the top 10 |
| 10 | BWX TECHNOLOGIES INC (BWXT) | 1.6% | 3.2% | Entered the top 10 |
| — | INSPIRE MED SYS INC (INSP) | 3.9% | 2.2% | Left the top 10 |
| — | ARISTA NETWORKS INC (ANET) | 2.5% | 2.8% | Left the top 10 |
Weights are each position's reported value as a share of the fund's reported equity positions (options and principal-amount holdings excluded).
Option positions (puts and calls)
Reported separately from the positions above. The value a 13F reports for an option is that of the underlying shares, not the option itself.
| Activity | Security | Type | Shares before | Shares now | Reported value |
|---|---|---|---|---|---|
| Exited | ISHARES TR (IWM) | Call | 150K | 0 | $0 |
| New | ECHOSTAR CORP (SATS) | Call | 0 | 437K | $12.1M |
| New | AMAZON COM INC (AMZN) | Call | 0 | 50,000 | $11M |
| New | UBER TECHNOLOGIES INC (UBER) | Call | 0 | 100K | $9.33M |
| Exited | TESLA INC (TSLA) | Put | 30,000 | 0 | $0 |
| Exited | LANTHEUS HLDGS INC (LNTH) | Put | 75,000 | 0 | $0 |
| New | MEDTRONIC PLC (MDT) | Call | 0 | 72,000 | $6.28M |
| Exited | SOLENO THERAPEUTICS INC (SLNO) | Call | 65,000 | 0 | $0 |
| Exited | MICRON TECHNOLOGY INC (MU) | Call | 40,000 | 0 | $0 |
| Exited | DOXIMITY INC (DOCS) | Call | 50,000 | 0 | $0 |
| New | FLOOR & DECOR HLDGS INC (FND) | Call | 0 | 30,000 | $2.28M |
| Exited | RXSIGHT INC (RXST) | Call | 50,000 | 0 | $0 |
| Exited | CELESTICA INC (CLS) | Call | 10,000 | 0 | $0 |