Atika Capital Management LLC holds a focused book of 62 stocks worth $1.0B as of Q2 2026 (disclosed Aug 13, 2026, a ~44-day 13F lag). This quarter they opened Advanced Micro Devices and trimmed Western Digital Corp. Their largest long position is Vertiv Holdings Co-A at 22% of the equity book. They also disclosed $349.6M in put options (a bearish bet) and $164.1M in call options (bullish), shown separately below and excluded from the equity book.
Top-heavy: focused book
Share of the disclosed book in its largest positions. A higher top-5 share means a more concentrated, higher-conviction portfolio.
100% mapped to company sectors
Direct operating-company sectors from our SIC-based security master. ETF/fund and unclassified holdings stay visible separately; this is not ETF look-through exposure.
Estimated $ traded · quarter-end prices, no cost basis
Other tracked managers holding the same core names as Atika Capital Management LLC
| Manager / fund | Shared names | Their $ in those |
|---|---|---|
| GAMMA Investing LLC | 77 / 62 | $304.2M |
| BlackRock, Inc. | 76 / 62 | $659.8B |
| FMR LLC | 76 / 62 | $304.7B |
| MORGAN STANLEY | 76 / 62 | $148.2B |
| JPMORGAN CHASE & CO | 76 / 62 | $140.3B |
| BANK OF AMERICA CORP /DE/ | 76 / 62 | $88.4B |
| GOLDMAN SACHS GROUP INC | 76 / 62 | $65.6B |
| UBS Group AG | 76 / 62 | $43.0B |
Ranked by how many of Atika Capital Management LLC's top 62 disclosed names each fund also holds: a cross-fund conviction signal from the latest 13F of every tracked manager.
Bars show each stock's share of the portfolio. Click a row for its position history.
| # | Security | Value | Shares | % Port | Last move | History |
|---|---|---|---|---|---|---|
| 1 | Vertiv Holdings Co COM CL A | $223.0M | 666.1K | 22.1% | —Held | |
| 2 | Seagate Technology HLDNGS PL ORD SHS | $77.1M | 79.9K | 7.6% | ▲+49% Added · +26K sh | |
| 3 | Advanced Micro Devices Inc COM | $55.5M | 95.5K | 5.5% | ▲New New position | |
| 4 | Eli Lilly & Co COM | $49.3M | 41.1K | 4.9% | —Held | |
| 5 | Intel Corp COM | $36.9M | 264.0K | 3.7% | ▲New New position | |
| 6 | Echostar Corp CL A | $33.6M | 331.4K | 3.3% | ▲+82% Added · +149K sh | |
| 7 | Guardant Health Inc COM | $27.2M | 181.0K | 2.7% | ▲+99% Added · +90K sh | |
| 8 | Ciena Corp COM NEW | $23.9M | 48.8K | 2.4% | ▲+12% Added · +5K sh | |
| 9 | Intuitive Surgical Inc COM NEW | $22.8M | 57.2K | 2.3% | —Held | |
| 10 | Vishay Precision Group Inc COM | $17.7M | 118.0K | 1.8% | ▲New New position | |
| 11 | Marvell Technology Inc COM | $17.3M | 58.0K | 1.7% | ▲New New position | |
| 12 | Rocket Lab Corp COM | $17.2M | 169.0K | 1.7% | ▲+97% Added · +83K sh | |
| 13 | Western Digital Corp COM | $16.9M | 26.5K | 1.7% | ▼−30% Reduced · −11K sh | |
| 14 | Revolution Medicines Inc COM | $16.5M | 88.0K | 1.6% | ▲New New position | |
| 15 | Ascendis Pharma A/s ORD SHS | $16.3M | 61.0K | 1.6% | ▲New New position | |
| 16 | Dianthus Therapeutics Inc COM | $16.1M | 165.0K | 1.6% | ▲+28% Added · +36K sh | |
| 17 | Axsome Therapeutics Inc. COM | $15.4M | 63.0K | 1.5% | ▲New New position | |
| 18 | Teva Pharmaceutical Inds Ltd SPONSORED ADS | $14.9M | 440.0K | 1.5% | ▼−7.8% Reduced · −37K sh | |
| 19 | Mastec Inc COM | $14.8M | 35.5K | 1.5% | ▼−38% Reduced · −22K sh | |
| 20 | Sharkninja Inc COM SHS | $13.4M | 88.0K | 1.3% | ▲New New position | |
| 21 | Netflix Inc. COM | $12.9M | 180.0K | 1.3% | —Held | |
| 22 | Curtiss Wright Corp COM | $12.1M | 16.0K | 1.2% | ▲+23% Added · +3K sh | |
| 23 | Kymera Therapeutics Inc COM | $11.9M | 104.0K | 1.2% | ▲New New position | |
| 24 | Sitime Corp COM | $11.2M | 15.0K | 1.1% | ▲+1.3% Added · +195 sh | |
| 25 | Twist Bioscience Corp COM | $11.1M | 108.0K | 1.1% | ▲New New position | |
| 26 | The Realreal Inc COM | $11.1M | 940.0K | 1.1% | ▲+108% Added · +489K sh | |
| 27 | Cogent Biosciences Inc COM | $10.5M | 272.0K | 1.0% | ▼−7.2% Reduced · −21K sh | |
| 28 | BWX Technologies Inc COM | $10.5M | 54.0K | 1.0% | ▼−35% Reduced · −29K sh | |
| 29 | Amazon Com Inc COM | $10.5M | 44.0K | 1.0% | ▲+0.7% Added · +300 sh | |
| 30 | BBB Foods Inc CL A COM | $10.4M | 250.0K | 1.0% | ▲+163% Added · +155K sh | |
| 31 | Axogen Inc COM | $10.2M | 221.0K | 1.0% | ▲New New position | |
| 32 | Nokia Corp SPONSORED ADR | $10.0M | 750.0K | 1.0% | ▲New New position | |
| 33 | Oruka Therapeutics Inc COM | $9.5M | 100.0K | 0.9% | ▼−57% Reduced · −130K sh | |
| 34 | TTM Technologies Inc COM | $9.4M | 50.0K | 0.9% | ▼−46% Reduced · −43K sh | |
| 35 | Charles Riv Labs Intl Inc COM | $8.6M | 38.0K | 0.9% | ▲New New position | |
| 36 | Acm Resh Inc COM CL A | $8.0M | 63.0K | 0.8% | ▲New New position | |
| 37 | Roivant Sciences Ltd SHS | $7.7M | 217.0K | 0.8% | ▲New New position | |
| 38 | Mercadolibre Inc COM | $7.7M | 4.5K | 0.8% | —Held | |
| 39 | Appfolio Inc COM CL A | $7.6M | 47.5K | 0.8% | —Held | |
| 40 | Protagonist Therapeutics Inc COM | $7.6M | 62.1K | 0.8% | —Held | |
| 41 | Reddit Inc CL A | $7.5M | 43.0K | 0.7% | ▲New New position | |
| 42 | Semtech Corp COM | $7.4M | 46.0K | 0.7% | ▲New New position | |
| 43 | Five Below Inc COM | $7.2M | 40.0K | 0.7% | ▲+1.3% Added · +520 sh | |
| 44 | Ferguson Enterprises Inc COMMON STOCK NEW | $7.0M | 29.3K | 0.7% | —Held | |
| 45 | Definium Therapeutics Inc COM SHS | $5.7M | 122.0K | 0.6% | ▲New New position | |
| 46 | Immunome Inc COM | $5.6M | 262.9K | 0.6% | —Held | |
| 47 | Hut 8 Corp COM | $5.1M | 44.5K | 0.5% | ▼−9.7% Reduced · −5K sh | |
| 48 | Warby Parker Inc CL A COM | $4.6M | 150.0K | 0.5% | ▲+11% Added · +15K sh | |
| 49 | Jatt II Acquisition Corp ORD SHS | $4.5M | 400.0K | 0.5% | ▲New New position | |
| 50 | Praxis Precision Medicines I COM NEW | $4.3M | 12.9K | 0.4% | ▲New New position |
The public view is the crawlable proof. The same sourced dataset is available through REST and MCP for agents, research scripts, and back-office tools.
This fund page is the Follow view. The Build view lets your agent pull holdings, quarter changes, overlap, and source filings through API or MCP.
curl -H "Authorization: Bearer YOUR_API_KEY" \ "https://arkolith.com/api/v1/funds/1599731/holdings"
Use Arkolith to show Atika Capital Management LLC's latest holdings, largest changes, and filing provenance.
Put / call positions from the 13F — totals include every disclosed option leg
| Type | Underlying | Notional value | Underlying shares |
|---|---|---|---|
| PUT · bearish | SS SPDR S&P BIOTECH ETFXBI | $89.0M | 6K |
| PUT · bearish | INVESCO QQQ TRUST SERIES 1QQQ | $73.6M | 1K |
| PUT · bearish | GE VERNOVA INCGEV | $58.7M | 500 |
| CALL · bullish | AMAZON.COM INCAMZN | $52.9M | 2K |
| CALL · bullish | INVESCO QQQ TRUST SERIES 1QQQ | $48.6M | 660 |
| PUT · bearish | MICRON TECHNOLOGY INCMU | $34.6M | 300 |
| PUT · bearish | VANECK SEMICONDUCTOR ETFSMH | $33.5M | 510 |
| PUT · bearish | ISHARES EXPANDED TECH-SOFTWAIGV | $24.6M | 3K |
| CALL · bullish | BRITISH AMERICAN TOB-SP ADRBTI | $20.4M | 3K |
| PUT · bearish | ISHARES BITCOIN TRUST ETFIBIT | $20.0M | 6K |
| PUT · bearish | ROUNDHILL ETF TRUST | $15.5M | 2K |
| CALL · bullish | STUBHUB HOLDINGS INC-CLASS ASTUB | $11.6M | 9K |
| CALL · bullish | ALKERMES PLCALKS | $8.4M | 2K |
| CALL · bullish | ECHOSTAR CORP-ASATS | $7.2M | 709 |
| CALL · bullish | ENPHASE ENERGY INCENPH | $5.9M | 1K |
| CALL · bullish | COREWEAVE INC-CL ACRWV | $3.5M | 350 |
| CALL · bullish | TEVA PHARMACEUTICAL-SP ADRTEVA | $3.4M | 1K |
| CALL · bullish | CLEVELAND-CLIFFS INCCLF | $1.4M | 2K |
| CALL · bullish | KEEL INFRASTRUCTURE CORP | $861K | 2K |
13F filers disclose option positions at the market value of the underlying the contracts reference, not the premium paid. A put is a bearish bet (it gains if the stock falls); a call is bullish. “Underlying shares” is the share count the contracts control, not a share holding. These legs are excluded from the equity book, weighting, concentration and sector figures above.
As-of date vs the date the SEC received each filing
| Quarter | As of | Filed | Positions | Value | Form |
|---|---|---|---|---|---|
| Q2 2026 | Jun 30, 2026 | Aug 13, 2026 | 243 | $1.5B | 13F-HR |
| Q1 2026 | Mar 31, 2026 | May 14, 2026 | 180 | $796.4M | 13F-HR |
| Q4 2025 | Dec 31, 2025 | Feb 13, 2026 | 231 | $949.8M | 13F-HR |
| Q3 2025 | Sep 30, 2025 | Nov 13, 2025 | 258 | $1.2B | 13F-HR |
| Q2 2025 | Jun 30, 2025 | Aug 13, 2025 | 189 | $1000.0M | 13F-HR |
| Q1 2025 | Mar 31, 2025 | May 14, 2025 | 186 | $711.1M | 13F-HR |
| Q4 2024 | Dec 31, 2024 | Feb 13, 2025 | 252 | $941.4M | 13F-HR |
| Q3 2024 | Sep 30, 2024 | Nov 13, 2024 | 252 | $975.4M | 13F-HR |
Holdings from SEC EDGAR 13F-HR filings, updated quarterly, filed up to 45 days after quarter-end. Public domain. The book and weighting are long equity only; disclosed put/call options are listed separately and excluded from those totals. Price-derived performance is withheld until the price-source policy and freshness gate are green.