CIK: 0001599731
Total reported value
$796.4M
Reporting period: 2026-03-31 · Number of holdings: 180
Atika Capital Management LLC disclosed 180 holdings in its latest 13F filing for the period ending 2026-03-31, with total reported value of $796.4M and a quarterly turnover rate of 74.2%.
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Atika Capital Management LLC's disclosed holdings carry a Herfindahl concentration index of 0.065 — mathematically equivalent to about 15 equally-sized positions, well below its 180 actual disclosed holdings. That gap points to a strategy built around a small core of high-conviction bets rather than broad diversification.
Position sizes vary widely across the portfolio (a coefficient of variation of 1.64), with a handful of outsized bets alongside many smaller positions.
No strong tilt toward either adding to existing winners or initiating outsized new positions was observed in the latest reported quarter.
Add VRT
+4.7% $63.9M
Trim XBI
-56.1% -$63.4M
Add NFLX
+0.9% $16.3M
Trim TEVA
-33.8% -$17.4M
Add STX
+3.1% $6.7M
Add 430
-6.4% $6.6M
Showing top 56 holdings (of 180 total)
| # | Ticker | Issuer | Asset Subclass | Weight | Weight Change | Shares Change | 4Q Trend |
|---|---|---|---|---|---|---|---|
| 1 | VRT | Vertiv Holdings Co-a | Stock-Industrials | 26.27% | +10.11% | +4.72% | |
| 2 | LLY | Eli Lilly & Co | Stock-Healthcare | 5.95% | +0.10% | — | |
| 3 | ISRG | Intuitive Surgical INC | Stock-Healthcare | 4.15% | -0.10% | — | |
| 4 | ECHO | Echostar Corp-a | Stock-Comm Services | 3.38% | -0.99% | +42.55% | |
| 5 | STX | Seagate Technology Holdings plc | Stock-Tech | 3.30% | +1.13% | +3.07% | |
| 6 | MTZ | Mastec INC | Stock-Industrials | 2.92% | +1.05% | +2.93% | |
| 7 | NFLX | Netflix INC | Stock-Comm Services | 2.75% | +2.39% | +0.92% | |
| 8 | CIEN | Ciena CORP | Stock-Tech | 2.67% | — | -27.25% | |
| 9 | BWXT | Bwx Technologies INC | Stock-Industrials | 2.66% | — | -24.20% | |
| 10 | 430 | Terns Pharmaceuticals INC | Stock-Other | 2.50% | +1.09% | -6.37% | |
| 11 | TEVA | Teva Pharmaceutical-sp Adr | Stock-Healthcare | 2.26% | -1.54% | -33.75% | |
| 12 | NET | Cloudflare INC - Class A | Stock-Tech | 2.11% | — | +18.40% | |
| 13 | GOOG | Alphabet Inc-cl C | Stock-Comm Services | 1.95% | — | +2.49% | |
| 14 | COGT | Cogent Biosciences INC | Stock-Other | 1.78% | -0.47% | -42.06% | |
| 15 | ORKA | Oruka Therapeutics INC | Stock-Other | 1.78% | +1.42% | NEW | |
| 16 | DNTH | Dianthus Therapeutics INC | Stock-Other | 1.70% | +0.78% | -4.26% | |
| 17 | WDC | Western Digital CORP | Stock-Tech | 1.61% | +1.28% | NEW | |
| 18 | AMZN | Amazon.com INC | Stock-Consumer Disc | 1.43% | -0.80% | -45.38% | |
| 19 | TTMI | Ttm Technologies | Stock-Tech | 1.43% | — | -8.35% | |
| 20 | FIVE | Five Below | Stock-Consumer Disc | 1.42% | — | -29.75% | |
| 21 | CW | Curtiss-wright CORP | Stock-Industrials | 1.39% | — | +31.55% | |
| 22 | GH | Guardant Health INC | Stock-Healthcare | 1.32% | — | -15.74% | |
| 23 | MELI | Mercadolibre INC | Stock-Consumer Disc | 1.23% | -0.28% | -24.16% | |
| 24 | APPF | Appfolio INC - A | Stock-Tech | 1.18% | — | +6.74% | |
| 25 | GDX | Vaneck Gold Miners ETF | ETF-Commodities | 1.18% | +2.65% | NEW | |
| 26 | UTHR | United Therapeutics CORP | Stock-Healthcare | 1.15% | +0.92% | NEW | |
| 27 | KRMN | Karman Holdings INC | Stock-Industrials | 1.14% | +0.91% | NEW | |
| 28 | FERG | Ferguson Enterprises INC | Stock-Industrials | 1.08% | — | — | |
| 29 | PTGX | Protagonist Therapeutics INC | Stock-Other | 1.03% | — | -27.79% | |
| 30 | CLH | Clean Harbors INC | Stock-Industrials | 0.99% | +0.72% | +628.50% | |
| 31 | TLN | Talen Energy CORP | Stock-Utilities | 0.93% | -0.92% | -56.08% | |
| 32 | IMNM | Immunome INC | Stock-Other | 0.91% | — | -21.37% | |
| 33 | META | Meta Platforms Inc-class A | Stock-Comm Services | 0.90% | +0.72% | NEW | |
| 34 | DBVT | Dbv Technologies Sa-spon Adr | Stock-Other | 0.89% | — | +31.14% | |
| 35 | RKLB | Rocket Lab CORP | Stock-Industrials | 0.87% | — | +38.45% | |
| 36 | HEI | Heico CORP | Stock-Industrials | 0.83% | — | -26.75% | |
| 37 | QXO | Qxo INC | Stock-Industrials | 0.81% | — | -37.08% | |
| 38 | SITM | Sitime CORP | Stock-Tech | 0.80% | +0.64% | NEW | |
| 39 | GE | General Electric | Stock-Industrials | 0.69% | — | -40.23% | |
| 40 | ASND | Ascendis Pharma A/S | Stock-Other | 0.69% | — | -7.35% | |
| 41 | REAL | Realreal Inc/the | Stock-Other | 0.64% | -0.43% | -20.17% | |
| 42 | LASR | Nlight INC | Stock-Other | 0.59% | — | — | |
| 43 | XENE | Xenon Pharmaceuticals INC | Stock-Other | 0.55% | — | -35.25% | |
| 44 | TBBB | BBB Foods Inc. | Stock-Other | 0.53% | — | -33.08% | |
| 45 | MAZE | Maze Therapeutics INC | Stock-Other | 0.52% | — | — | |
| 46 | ABVX | Abivax Sa-adr | Stock-Other | 0.50% | -0.38% | -47.64% | |
| 47 | ACHC | Acadia Healthcare Co INC | Stock-Other | 0.45% | — | — | |
| 48 | WRBY | Warby Parker Inc-class A | Stock-Other | 0.45% | — | -45.78% | |
| 49 | KRYS | Krystal Biotech INC | Stock-Healthcare | 0.43% | — | — | |
| 50 | BBIO | Bridgebio Pharma INC | Stock-Healthcare | 0.41% | — | — |
Performance for Q3 2026
-8.8%
Performance Last 4 Quarters
+19.8%
Based on 76% of reported portfolio value with available pricing
| Period | Holdings | Total value | Stability | Top holdings |
|---|---|---|---|---|
| 2026-03-31 | 180 | $796.4M | 74 | |
| 2025-12-31 | 231 | $949.8M | 100 | |
| 2025-09-30 | 258 | $1.2B | 74 | |
| 2025-06-30 | 189 | $1.0B | 0 | |
| 2025-03-31 | 186 | $711.1M | 100 | |
| 2024-12-31 | 252 | $941.4M | 0 | |
| 2024-09-30 | 252 | $975.4M | 0 | |
| 2024-06-30 | 273 | $1.0B | 0 | |
| 2024-03-31 | 264 | $1.0B | 0 | |
| 2023-12-31 | 228 | $746.8M | 0 | |
| 2023-09-30 | 225 | $761.9M | 0 | |
| 2023-06-30 | 248 | $999.0M | 0 | |
| 2023-03-31 | 231 | $677.1M | 0 | |
| 2022-12-31 | 195 | $695.5M | 0 | |
| 2022-09-30 | 272 | $1.2B | 0 | |
| 2022-06-30 | 228 | $889.6M | 0 | |
| 2022-03-31 | 210 | $1.2B | 0 | |
| 2021-12-31 | 264 | $1.4B | 0 | |
| 2021-09-30 | 342 | $1.7B | 0 | |
| 2021-06-30 | 285 | $1.3B | 95 | |
| 2021-03-31 | 270 | $1.2B | 73 | |
| 2020-12-31 | 327 | $1.3B | 87 | |
| 2020-09-30 | 318 | $1.2B | 75 | |
| 2020-06-30 | 282 | $773.8M | 70 | |
| 2020-03-31 | 252 | $521.8M | 80 | |
| 2019-12-31 | 228 | $517.9M | 70 | |
| 2019-09-30 | 146 | $475.0M | 53 | |
| 2019-06-30 | 154 | $509.1M | 75 | |
| 2019-03-31 | 143 | $492.2M | 82 | |
| 2018-12-31 | 140 | $339.7M | 81 | |
| 2018-09-30 | 172 | $557.6M | 72 | |
| 2018-06-30 | 176 | $520.1M | 97 | |
| 2018-03-31 | 140 | $291.9M | 77 | |
| 2017-12-31 | 130 | $258.7M | 82 | |
| 2017-09-30 | 158 | $348.1M | 67 | |
| 2017-06-30 | 152 | $285.4M | 94 | |
| 2017-03-31 | 124 | $204.3M | 88 | |
| 2016-12-31 | 108 | $168.0M | 100 | |
| 2016-09-30 | 132 | $244.9M | 100 | |
| 2016-06-30 | 120 | $233.4M | 100 | |
| 2016-03-31 | 88 | $165.4M | 100 | |
| 2015-12-31 | 112 | $194.3M | 100 | |
| 2015-09-30 | 114 | $203.9M | 92 | |
| 2015-06-30 | 132 | $222.1M | 91 | |
| 2015-03-31 | 122 | $149.8M | 91 | |
| 2014-12-31 | 138 | $136.8M | 69 | |
| 2014-09-30 | 66 | $130.1M | 91 | |
| 2014-06-30 | 64 | $123.0M | 100 | |
| 2014-03-31 | 61 | $117.5M | 90 | |
| 2013-12-31 | 63 | $112.5M | 0 |
Atika Capital Management LLC's most significant position changes for 2026-03-31: New buy: Vaneck Semiconductor ETF (SMH); New buy: Vaneck Gold Miners ETF (GDX); Sold out: Shopify INC - Class A (SHOP); Sold out: Madrigal Pharmaceuticals INC (MDGL); Sold out: Robinhood Markets INC - A (HOOD).
| # | Ticker | Issuer | Weight Change | Shares Change | Action |
|---|---|---|---|---|---|
| 1 | VRT | Vertiv Holdings Co-a | +10.1% | +4.72% | Add |
| 2 | NFLX | Netflix INC | +2.4% | +0.92% | Add |
| 3 | STX | Seagate Technology Holdings plc | +1.1% | +3.07% | Add |
| 4 | 430 | Terns Pharmaceuticals INC | +1.1% | -6.37% | Trim |
| 5 | MTZ | Mastec INC | +1.1% | +2.93% | Add |
| 6 | DNTH | Dianthus Therapeutics INC | +0.8% | -4.26% | Trim |
| 7 | CLH | Clean Harbors INC | +0.7% | +628.50% | Add |
| 8 | LLY | Eli Lilly & Co | +0.1% | — | Unchanged |
| 9 | ISRG | Intuitive Surgical INC | -0.1% | — | Unchanged |
| 10 | MELI | Mercadolibre INC | -0.3% | -24.16% | Trim |
| 11 | ABVX | Abivax Sa-adr | -0.4% | -47.64% | Trim |
| 12 | REAL | Realreal Inc/the | -0.4% | -20.17% | Trim |
| 13 | COGT | Cogent Biosciences INC | -0.5% | -42.06% | Trim |
| 14 | AMZN | Amazon.com INC | -0.8% | -45.38% | Trim |
| 15 | TLN | Talen Energy CORP | -0.9% | -56.08% | Trim |
| 16 | ECHO | Echostar Corp-a | -1% | +42.55% | Add |
| 17 | TEVA | Teva Pharmaceutical-sp Adr | -1.5% | -33.75% | Trim |
| 18 | XBI | Ss Spdr S&p Biotech ETF | -5.6% | -56.10% | Trim |
| 19 | SMH | Vaneck Semiconductor ETF | — | NEW | New buy |
| 20 | GDX | Vaneck Gold Miners ETF | — | NEW | New buy |
| 21 | SHOP | Shopify INC - Class A | — | EXIT | Sold out |
| 22 | MDGL | Madrigal Pharmaceuticals INC | — | EXIT | Sold out |
| 23 | HOOD | Robinhood Markets INC - A | — | EXIT | Sold out |
| 24 | TSLA | Tesla INC | — | EXIT | Sold out |
| 25 | INSM | Insmed INC | — | EXIT | Sold out |
| 26 | ORKA | Oruka Therapeutics INC | — | NEW | New buy |
| 27 | DASH | Doordash INC - A | — | EXIT | Sold out |
| 28 | WDC | Western Digital CORP | — | NEW | New buy |
| 29 | AXSM | Axsome Therapeutics INC | — | EXIT | Sold out |
| 30 | MDB | Mongodb INC | — | EXIT | Sold out |
| 31 | LMND | Lemonade INC | — | EXIT | Sold out |
| 32 | CSL | Carlisle Cos INC | — | EXIT | Sold out |
| 33 | EMBJ | Embraer Sa-spon Adr | — | EXIT | Sold out |
| 34 | IBIT | Ishares Bitcoin Trust ETF | — | EXIT | Sold out |
| 35 | UTHR | United Therapeutics CORP | — | NEW | New buy |
| 36 | KRMN | Karman Holdings INC | — | NEW | New buy |
| 37 | ROKU | Roku INC | — | EXIT | Sold out |
| 38 | RH | Rh | — | EXIT | Sold out |
| 39 | SN | SharkNinja, Inc. | — | EXIT | Sold out |
| 40 | META | Meta Platforms Inc-class A | — | NEW | New buy |
| 41 | SITM | Sitime CORP | — | NEW | New buy |
| 42 | MDLN | Medline Inc-cl A | — | EXIT | Sold out |
| 43 | FND | Floor & Decor Holdings Inc-a | — | EXIT | Sold out |
| 44 | RIVN | Rivian Automotive Inc-a | — | EXIT | Sold out |
| 45 | FIGR | Figure Technology Solut-cl A | — | EXIT | Sold out |
| 46 | BBWI | Bath & Body Works INC | — | EXIT | Sold out |
| 47 | EEM | Ishares Msci Emerging Market | — | EXIT | Sold out |
| 48 | INTC | Intel CORP | — | NEW | New buy |
| 49 | EOSE | Eos Energy Enterprises INC | — | EXIT | Sold out |
| 50 | ALNY | Alnylam Pharmaceuticals INC | — | EXIT | Sold out |
| Period | Filed | Type | EDGAR |
|---|---|---|---|
| 2026-03-31 | 2026-05-14 | 13F-HR | View on EDGAR |
| 2025-12-31 | 2026-02-13 | 13F-HR | View on EDGAR |
| 2025-09-30 | 2025-11-13 | 13F-HR | View on EDGAR |
| 2025-06-30 | 2025-08-13 | 13F-HR | View on EDGAR |
| 2025-03-31 | 2025-05-14 | 13F-HR | View on EDGAR |
| 2024-12-31 | 2025-02-13 | 13F-HR | View on EDGAR |
| 2024-09-30 | 2024-11-13 | 13F-HR | View on EDGAR |
| 2024-06-30 | 2024-08-13 | 13F-HR | View on EDGAR |
| 2024-03-31 | 2024-05-14 | 13F-HR | View on EDGAR |
| 2023-12-31 | 2024-02-13 | 13F-HR | View on EDGAR |
| 2023-09-30 | 2023-11-13 | 13F-HR | View on EDGAR |
| 2023-06-30 | 2023-08-11 | 13F-HR | View on EDGAR |
| 2023-03-31 | 2023-05-12 | 13F-HR | View on EDGAR |
| 2022-12-31 | 2023-02-13 | 13F-HR | View on EDGAR |
| 2022-09-30 | 2022-11-14 | 13F-HR | View on EDGAR |
| 2022-06-30 | 2022-08-12 | 13F-HR | View on EDGAR |
| 2022-03-31 | 2022-05-13 | 13F-HR | View on EDGAR |
| 2021-12-31 | 2022-02-11 | 13F-HR | View on EDGAR |
| 2021-09-30 | 2021-11-12 | 13F-HR | View on EDGAR |
| 2021-06-30 | 2021-08-12 | 13F-HR | View on EDGAR |
| 2021-03-31 | 2021-05-14 | 13F-HR | View on EDGAR |
| 2020-12-31 | 2021-02-16 | 13F-HR | View on EDGAR |
| 2020-09-30 | 2020-11-13 | 13F-HR | View on EDGAR |
| 2020-06-30 | 2020-08-13 | 13F-HR | View on EDGAR |
| 2020-03-31 | 2020-05-14 | 13F-HR | View on EDGAR |
| 2019-12-31 | 2020-02-14 | 13F-HR | View on EDGAR |
| 2019-09-30 | 2019-11-14 | 13F-HR | View on EDGAR |
| 2019-06-30 | 2019-08-12 | 13F-HR | View on EDGAR |
| 2019-03-31 | 2019-05-13 | 13F-HR | View on EDGAR |
| 2018-12-31 | 2019-02-14 | 13F-HR | View on EDGAR |
| 2018-09-30 | 2018-11-14 | 13F-HR | View on EDGAR |
| 2018-06-30 | 2018-08-14 | 13F-HR | View on EDGAR |
| 2018-03-31 | 2018-05-15 | 13F-HR | View on EDGAR |
| 2017-12-31 | 2018-02-14 | 13F-HR | View on EDGAR |
| 2017-09-30 | 2017-11-14 | 13F-HR | View on EDGAR |
| 2017-06-30 | 2017-08-14 | 13F-HR | View on EDGAR |
| 2017-03-31 | 2017-05-15 | 13F-HR | View on EDGAR |
| 2016-12-31 | 2017-02-14 | 13F-HR | View on EDGAR |
| 2016-09-30 | 2016-11-14 | 13F-HR | View on EDGAR |
| 2016-06-30 | 2016-08-15 | 13F-HR | View on EDGAR |
| 2016-03-31 | 2016-05-16 | 13F-HR | View on EDGAR |
| 2015-12-31 | 2016-02-16 | 13F-HR | View on EDGAR |
| 2015-09-30 | 2015-11-16 | 13F-HR | View on EDGAR |
| 2015-06-30 | 2015-08-14 | 13F-HR | View on EDGAR |
| 2015-03-31 | 2015-05-15 | 13F-HR | View on EDGAR |
| 2014-12-31 | 2015-02-17 | 13F-HR | View on EDGAR |
| 2014-09-30 | 2014-11-14 | 13F-HR | View on EDGAR |
| 2014-06-30 | 2014-08-14 | 13F-HR | View on EDGAR |
| 2014-03-31 | 2014-05-15 | 13F-HR | View on EDGAR |
| 2013-12-31 | 2014-02-14 | 13F-HR | View on EDGAR |
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