Atika Capital Management LLC: 13F holdings, Q2 2026
Hedge fund · SEC EDGAR filings (CIK 1599731) · Explore on the interactive board
Atika Capital Management LLC disclosed 62 US equity positions worth $1.0bn in its Q2 2026 13F filing (holdings as of June 30, 2026, filed August 13, 2026). Its largest position is VRT at 22.1% of the reported book, followed by STX, AMD. The top ten holdings are 56.3% of the book, and the portfolio behaves like about 14 equal-weight positions. Versus the prior filing it opened 29 new positions, added to 13, reduced 11 and exited 19. Note: this manager's most recent filing is 3934 quarters behind the newest quarter on file, so these figures are history rather than current positioning.
What does Atika Capital Management LLC own? Top holdings as of June 30, 2026
Change is measured in shares against the previous filing (Q1 2026), so price moves do not read as decisions. This quarter: 29 new, 13 added, 11 reduced, 19 exited.
| # | Stock | Sector | Weight | Value | Shares | Δ shares | Action |
|---|---|---|---|---|---|---|---|
| 1 | VRT VERTIV HOLDINGS CO | Industrials | 22.1% | $223.0m | 666,100 | 0% | held |
| 2 | STX SEAGATE TECHNOLOGY HLDNGS PL | Technology | 7.6% | $77.1m | 79,865 | 49% | added |
| 3 | AMD ADVANCED MICRO DEVICES INC | Technology | 5.5% | $55.5m | 95,500 | – | new |
| 4 | LLY ELI LILLY & CO | Healthcare | 4.9% | $49.3m | 41,100 | 0% | held |
| 5 | INTC INTEL CORP | Technology | 3.7% | $36.9m | 264,000 | – | new |
| 6 | ECHO ECHOSTAR CORP | Communication Services | 3.3% | $33.6m | 331,400 | 82% | added |
| 7 | GH GUARDANT HEALTH INC | Healthcare | 2.7% | $27.2m | 181,000 | 99% | added |
| 8 | CIEN CIENA CORP | Technology | 2.4% | $23.9m | 48,768 | 12% | added |
| 9 | ISRG INTUITIVE SURGICAL INC | Healthcare | 2.3% | $22.8m | 57,216 | 0% | held |
| 10 | VPG VISHAY PRECISION GROUP INC | Technology | 1.8% | $17.7m | 118,000 | – | new |
| 11 | MRVL MARVELL TECHNOLOGY INC | Technology | 1.7% | $17.3m | 58,000 | – | new |
| 12 | RKLB ROCKET LAB CORP | Industrials | 1.7% | $17.2m | 169,000 | 97% | added |
| 13 | WDC WESTERN DIGITAL CORP | Technology | 1.7% | $16.9m | 26,477 | -30% | reduced |
| 14 | RVMD REVOLUTION MEDICINES INC | Healthcare | 1.6% | $16.5m | 88,000 | – | new |
| 15 | ASND ASCENDIS PHARMA A/S | Healthcare | 1.6% | $16.3m | 61,000 | – | new |
| 16 | DNTH DIANTHUS THERAPEUTICS INC | Healthcare | 1.6% | $16.1m | 165,000 | 28% | added |
| 17 | AXSM AXSOME THERAPEUTICS INC. | Healthcare | 1.5% | $15.4m | 63,000 | – | new |
| 18 | TEVA TEVA PHARMACEUTICAL INDS LTD | Healthcare | 1.5% | $14.9m | 440,000 | -8% | reduced |
| 19 | MTZ MASTEC INC | Industrials | 1.5% | $14.8m | 35,500 | -38% | reduced |
| 20 | SN SHARKNINJA INC | Consumer Cyclical | 1.3% | $13.4m | 88,000 | – | new |
| 21 | NFLX NETFLIX INC. | Communication Services | 1.3% | $12.9m | 180,000 | 0% | held |
| 22 | CW CURTISS WRIGHT CORP | Industrials | 1.2% | $12.1m | 16,000 | 23% | added |
| 23 | KYMR KYMERA THERAPEUTICS INC | Healthcare | 1.2% | $11.9m | 104,000 | – | new |
| 24 | SITM SITIME CORP | Technology | 1.1% | $11.2m | 15,000 | 1% | added |
| 25 | TWST TWIST BIOSCIENCE CORP | Healthcare | 1.1% | $11.1m | 108,000 | – | new |
| 26 | REAL THE REALREAL INC | Consumer Cyclical | 1.1% | $11.1m | 940,000 | 108% | added |
| 27 | COGT COGENT BIOSCIENCES INC | Healthcare | 1.0% | $10.5m | 272,000 | -7% | reduced |
| 28 | BWXT BWX TECHNOLOGIES INC | Industrials | 1.0% | $10.5m | 54,000 | -35% | reduced |
| 29 | AMZN AMAZON COM INC | Consumer Cyclical | 1.0% | $10.5m | 44,000 | 1% | added |
| 30 | TBBB BBB FOODS INC | Consumer Defensive | 1.0% | $10.4m | 250,000 | 163% | added |
| 31 | AXGN AXOGEN INC | Healthcare | 1.0% | $10.2m | 221,000 | – | new |
| 32 | NOK NOKIA CORP | Technology | 1.0% | $10.0m | 750,000 | – | new |
| 33 | ORKA ORUKA THERAPEUTICS INC | Healthcare | 0.9% | $9.5m | 100,000 | -57% | reduced |
| 34 | TTMI TTM TECHNOLOGIES INC | Technology | 0.9% | $9.4m | 50,000 | -46% | reduced |
| 35 | CRL CHARLES RIV LABS INTL INC | Healthcare | 0.9% | $8.6m | 38,000 | – | new |
| 36 | ACMR ACM RESH INC | Technology | 0.8% | $8.0m | 63,000 | – | new |
| 37 | ROIV ROIVANT SCIENCES LTD | Healthcare | 0.8% | $7.7m | 217,000 | – | new |
| 38 | MELI MERCADOLIBRE INC | Consumer Cyclical | 0.8% | $7.7m | 4,510 | 0% | held |
| 39 | APPF APPFOLIO INC | Technology | 0.8% | $7.6m | 47,500 | 0% | held |
| 40 | PTGX PROTAGONIST THERAPEUTICS INC | Healthcare | 0.8% | $7.6m | 62,100 | 0% | held |
| 41 | RDDT REDDIT INC | Communication Services | 0.7% | $7.5m | 43,000 | – | new |
| 42 | SMTC SEMTECH CORP | Technology | 0.7% | $7.4m | 46,000 | – | new |
| 43 | FIVE FIVE BELOW INC | Consumer Cyclical | 0.7% | $7.2m | 40,000 | 1% | added |
| 44 | FERG FERGUSON ENTERPRISES INC | Industrials | 0.7% | $7.0m | 29,300 | 0% | held |
| 45 | DFTX DEFINIUM THERAPEUTICS INC | Healthcare | 0.6% | $5.7m | 122,000 | – | new |
| 46 | IMNM IMMUNOME INC | Healthcare | 0.6% | $5.6m | 262,900 | 0% | held |
| 47 | HUT HUT 8 CORP | Financial Services | 0.5% | $5.1m | 44,500 | -10% | reduced |
| 48 | WRBY WARBY PARKER INC | Healthcare | 0.5% | $4.6m | 150,000 | 11% | added |
| 49 | JATT II ACQUISITION CORP | 0.5% | $4.5m | 400,000 | – | new | |
| 50 | PRAX PRAXIS PRECISION MEDICINES I | Healthcare | 0.4% | $4.3m | 12,900 | – | new |
What did Atika Capital Management LLC sell? Positions exited since the previous filing
| Stock | Prior weight | Prior value |
|---|---|---|
| 430 TERNS PHARMACEUTICALS INC | 13.1% | $15.8m |
| NET CLOUDFLARE INC | 11.1% | $13.4m |
| GOOG ALPHABET INC | 10.3% | $12.4m |
| GDX VANECK ETF TRUST | 6.1% | $7.3m |
| UTHR UNITED THERAPEUTICS CORP DEL | 6.1% | $7.3m |
| KRMN KARMAN HLDGS INC | 6.0% | $7.2m |
| CLH CLEAN HARBORS INC | 5.2% | $6.3m |
| TLN TALEN ENERGY CORP | 4.9% | $5.9m |
| META META PLATFORMS INC | 4.7% | $5.7m |
| DBVT DBV TECHNOLOGIES S A | 4.7% | $5.7m |
| HEI HEICO CORP NEW | 4.4% | $5.3m |
| QXO QXO INC | 4.2% | $5.1m |
| GE GE AEROSPACE | 3.6% | $4.4m |
| ASND ASCENDIS PHARMA A/S | 3.6% | $4.4m |
| XENE XENON PHARMACEUTICALS INC | 2.9% | $3.5m |
| MAZE MAZE THERAPEUTICS INC | 2.8% | $3.3m |
| ACHC ACADIA HEALTHCARE COMPANY IN | 2.4% | $2.9m |
| BBIO BRIDGEBIO PHARMA INC | 2.2% | $2.6m |
| HEI/A HEICO CORP NEW | 1.8% | $2.2m |
Sector mix
| Sector | Weight |
|---|---|
| Technology | 30.4% |
| Healthcare | 28.8% |
| Industrials | 28.2% |
| Communication Services | 5.4% |
| Consumer Cyclical | 5.0% |
| Consumer Defensive | 1.0% |
Sectors cover positions whose ticker resolved to a sector; the remainder is unclassified, not cash.
Filing history
How concentrated is Atika Capital Management LLC's portfolio?
Across every quarter Atika Capital Management LLC has filed, its median largest position is 24.2% of the book and its median top-ten weight is 56.4%, which WhaleCreep classifies as concentrated (the gate is a median largest position of 5%). Of 18.0 completed holding spells, the median lasted 1.0 quarters; 62.0 positions are still open and their final length is unknown.