Atika Capital Management LLC

In its 13F for Q1 2026 (holdings as of March 31, 2026, filed May 14, 2026), Atika Capital Management LLC reported 52 stock positions worth $633.6 million. Its top holding was Vertiv Class A (VRT) at 26.3% of the portfolio, followed by Eli Lilly (LLY, 6.0%) and Intuitive Surgical (ISRG, 4.2%). Compared with Q4 2025, it opened 14 new positions, sold out of 26, added to 11 and reduced 23. The biggest buy was Vertiv Class A (VRT, shares +5%) and the biggest sale an exit from Shopify Class A (SHOP).

Most Recent 13F
Q2 2026
Location
NEW YORK, NY
CIK
0001599731
Portfolio Value
$633.6M (Q1 2026)
SEC Filing
0001214659-26-006119 ↗ filed May 14, 2026

Holdings Value

0$500.0M$1.0B$1.5B Q1 2024: $891.5M Q1 2024 Q2 2024: $862.5M Q2 2024 Q3 2024: $935.1M Q3 2024 Q4 2024: $772.3M Q4 2024 Q1 2025: $651.3M Q1 2025 Q2 2025: $957.3M Q2 2025 Q3 2025: $1.2B Q3 2025 Q4 2025: $718.1M Q4 2025 Q1 2026: $633.6M $633.6M Q1 2026 Q2 2026: $1.0B Q2 2026

Holdings 52 stocks · $633.6M
VRT Vertiv Holdings Co. Class A 26.34% 666,100 $166.9M Add +4.7%
LLY Eli Lilly & Co. 5.97% 41,100 $37.8M No change
ISRG Intuitive Surgical Inc. 4.16% 57,216 $26.4M No change
ECHO Echostar Corp. Class A 3.36% 182,000 $21.3M Add +45.8%
STX Seagate Technology Holdings 3.31% 53,500 $21.0M Add +3.1%
MTZ Mastec Inc. 2.93% 57,636 $18.5M Add +2.9%
NFLX Netflix Inc. 2.73% 180,000 $17.3M No change
CIEN Ciena Corp. 2.67% 43,651 $16.9M Reduce -27.3%
BWXT BWX Technologies Inc. 2.66% 82,550 $16.9M Reduce -24.2%
TERN Terns Pharmaceuticals Inc. 2.50% 300,000 $15.8M Reduce -6.6%
TEVA Teva Pharmaceutical-SP ADR 2.27% 477,000 $14.4M Reduce -33.5%
NET Cloudflare Inc. Class A 2.12% 65,000 $13.4M Add +18.4%
GOOG Alphabet Inc. Class C 1.96% 43,250 $12.4M Add +2.5%
COGT Cogent Biosciences Inc. 1.78% 293,200 $11.3M Reduce -42.1%
ORKA Oruka Therapeutics Inc. 1.78% 229,900 $11.3M New
DNTH Dianthus Therapeutics Inc. 1.71% 128,800 $10.8M Reduce -4.3%
WDC Western Digital Corp. 1.61% 37,717 $10.2M New
AMZN Amazon.com Inc. 1.44% 43,700 $9.1M Reduce -45.4%
TTMI TTM Technologies 1.43% 93,000 $9.1M Reduce -8.3%
FIVE Five Below 1.42% 39,480 $9.0M Reduce -29.8%
CW Curtiss-Wright Corp. 1.40% 13,000 $8.9M Add +31.6%
GH Guardant Health Inc. 1.33% 91,000 $8.4M Reduce -15.7%
MELI MercadoLibre Inc. 1.23% 4,510 $7.8M Reduce -24.2%
APPF Appfolio Inc. Class A 1.18% 47,500 $7.5M Add +6.7%
GDX Vaneck Gold Miners ETF 1.16% 80,000 $7.3M New
UTHR United Therapeutics Corp. 1.16% 12,350 $7.3M New
KRMN Karman Holdings Inc. 1.14% 90,500 $7.2M New
FERG Ferguson Enterprises Inc. 1.08% 29,300 $6.8M No change
PTGX Protagonist Therapeutics Inc. 1.03% 62,100 $6.5M Reduce -27.8%
CLH Clean Harbors Inc. 0.99% 21,855 $6.3M Add +628.5%
TLN Talen Energy Corp. 0.93% 18,490 $5.9M Reduce -56.1%
IMNM Immunome Inc. 0.91% 262,900 $5.7M Reduce -21.4%
META Meta Platforms Inc. Class A 0.90% 10,000 $5.7M New
DBVT DBV Technologies SA-Spon ADR 0.89% 271,300 $5.7M Add +31.1%
RKLB Rocket Lab Corp. 0.87% 86,000 $5.5M Add +38.5%
HEI Heico Corp. 0.83% 19,265 $5.3M Reduce -26.8%
QXO Qxo Inc. 0.81% 264,253 $5.1M Reduce -37.1%
SITM Sitime Corp. 0.81% 14,805 $5.1M New
GE General Electric filed as GE AEROSPACE 0.69% 15,510 $4.4M Reduce -40.2%
ASND Ascendis Pharma A/S 0.69% 19,125 $4.4M Reduce -7.3%
REAL The Realreal Inc. filed as THE REALREAL INC 0.65% 451,055 $4.1M Reduce -20.2%
LASR Nlight Inc. 0.59% 66,000 $3.8M New
XENE Xenon Pharmaceuticals Inc. 0.55% 59,900 $3.5M Reduce -35.3%
TBBB BBB Foods Inc. Class A 0.53% 95,218 $3.4M Reduce -33.1%
MAZE Maze Therapeutics Inc. 0.53% 111,500 $3.3M New
ABVX Abivax SA-ADR 0.51% 28,800 $3.2M Reduce -47.6%
ACHC Acadia Healthcare Co. Inc. 0.45% 122,600 $2.9M New
WRBY Warby Parker Inc. Class A 0.45% 135,000 $2.8M Reduce -45.8%
KRYS Krystal Biotech Inc. 0.43% 10,625 $2.7M New
BBIO Bridgebio Pharma Inc. 0.41% 35,200 $2.6M New
HUT Hut 8 Corp. 0.36% 49,300 $2.3M New
HEI.A Heico Corp. Class A 0.35% 10,575 $2.2M New

Options reported separately and not counted above: XBI puts ($54.0M), SMH puts ($27.6M), IWM puts ($24.8M), ECHO calls ($18.5M), NFLX calls ($15.9M), GDX calls ($13.8M), INTC calls ($4.4M), TERN calls ($3.8M).

Portfolio Sells Q4 2025 → Q1 2026
SHOP Shopify Inc. Class A Sold out 0.00% −2.78
MDGL Madrigal Pharmaceuticals Inc. Sold out 0.00% −2.76
TSLA Tesla Inc. Sold out 0.00% −1.88
INSM Insmed Inc. Sold out 0.00% −1.87
DASH DoorDash Inc. Class A Sold out 0.00% −1.45
AXSM Axsome Therapeutics Inc. Sold out 0.00% −1.41
MDB Mongodb Inc. Sold out 0.00% −1.30
TLN Talen Energy Corp. Reduce -56.1% 0.93% −1.27
AMZN Amazon.com Inc. Reduce -45.4% 1.44% −1.13
LMND Lemonade Inc. Sold out 0.00% −1.13
CSL Carlisle Cos Inc. Sold out 0.00% −1.13
EMBJ Embraer SA-Spon ADR Sold out 0.00% −1.04
ROKU Roku Inc. Sold out 0.00% −0.92
RH RH Sold out 0.00% −0.87
TEVA Teva Pharmaceutical-SP ADR Reduce -33.5% 2.27% −0.85
SN Sharkninja Inc. Sold out 0.00% −0.82
HOOD Robinhood Markets Inc. Class A Sold out 0.00% −0.81
COGT Cogent Biosciences Inc. Reduce -42.1% 1.78% −0.72
MDLN Medline Inc. Class A Sold out 0.00% −0.69
FIGR Figure Technology Solut Class A Sold out 0.00% −0.63
BBWI Bath & Body Works Inc. Sold out 0.00% −0.63
REAL The Realreal Inc. Reduce -20.2% 0.65% −0.60
ALNY Alnylam Pharmaceuticals Inc. Sold out 0.00% −0.57
KNSA Kiniksa Pharmaceuticals Inte Sold out 0.00% −0.54
ABVX Abivax SA-ADR Reduce -47.6% 0.51% −0.53
IONS Ionis Pharmaceuticals Inc. Sold out 0.00% −0.52
ANF Abercrombie & Fitch Co. Class A Sold out 0.00% −0.51
RAPT Rapt Therapeutics Inc. Sold out 0.00% −0.44
MELI MercadoLibre Inc. Reduce -24.2% 1.23% −0.44
AAOI Applied Optoelectronics Inc. Sold out 0.00% −0.43
GE General Electric Reduce -40.2% 0.69% −0.42
HEI Heico Corp. Reduce -26.8% 0.83% −0.35
RKT Rocket Cos Inc. Class A Sold out 0.00% −0.35
QXO Qxo Inc. Reduce -37.1% 0.81% −0.32
WRBY Warby Parker Inc. Class A Reduce -45.8% 0.45% −0.31
CECO Ceco Environmental Corp. Sold out 0.00% −0.25
GH Guardant Health Inc. Reduce -15.7% 1.33% −0.21
TBBB BBB Foods Inc. Class A Reduce -33.1% 0.53% −0.13
IMNM Immunome Inc. Reduce -21.4% 0.91% −0.09
RDDT Reddit Inc. Class A Sold out 0.00% −0.06
FIVE Five Below Reduce -29.8% 1.42% −0.05
XENE Xenon Pharmaceuticals Inc. Reduce -35.3% 0.55% −0.03
PTGX Protagonist Therapeutics Inc. Reduce -27.8% 1.03% −0.01
BWXT BWX Technologies Inc. Reduce -24.2% 2.66% +0.04
ASND Ascendis Pharma A/S Reduce -7.3% 0.69% +0.08
TTMI TTM Technologies Reduce -8.3% 1.43% +0.45
TERN Terns Pharmaceuticals Inc. Reduce -6.6% 2.50% +0.69
CIEN Ciena Corp. Reduce -27.3% 2.67% +0.72
DNTH Dianthus Therapeutics Inc. Reduce -4.3% 1.71% +0.93

Portfolio Buys Q4 2025 → Q1 2026
VRT Vertiv Holdings Co. Class A Add +4.7% 26.34% +11.99
ORKA Oruka Therapeutics Inc. New 1.78% +1.78
WDC Western Digital Corp. New 1.61% +1.61
ECHO Echostar Corp. Class A Add +45.8% 3.36% +1.47
STX Seagate Technology Holdings Add +3.1% 3.31% +1.32
MTZ Mastec Inc. Add +2.9% 2.93% +1.23
GDX Vaneck Gold Miners ETF New 1.16% +1.16
UTHR United Therapeutics Corp. New 1.16% +1.16
KRMN Karman Holdings Inc. New 1.14% +1.14
META Meta Platforms Inc. Class A New 0.90% +0.90
CLH Clean Harbors Inc. Add +628.5% 0.99% +0.89
SITM Sitime Corp. New 0.81% +0.81
CW Curtiss-Wright Corp. Add +31.6% 1.40% +0.64
NET Cloudflare Inc. Class A Add +18.4% 2.12% +0.61
LASR Nlight Inc. New 0.59% +0.59
MAZE Maze Therapeutics Inc. New 0.53% +0.53
ACHC Acadia Healthcare Co. Inc. New 0.45% +0.45
KRYS Krystal Biotech Inc. New 0.43% +0.43
BBIO Bridgebio Pharma Inc. New 0.41% +0.41
HUT Hut 8 Corp. New 0.36% +0.36
HEI.A Heico Corp. Class A New 0.35% +0.35
DBVT DBV Technologies SA-Spon ADR Add +31.1% 0.89% +0.34
RKLB Rocket Lab Corp. Add +38.5% 0.87% +0.27
GOOG Alphabet Inc. Class C Add +2.5% 1.96% +0.11
APPF Appfolio Inc. Class A Add +6.7% 1.18% −0.26

Options Activity Q4 2025 → Q1 2026
XBI SS SPDR S&P Biotech ETF put Reduce -56.1% 4,225 $54.0M
SMH Vaneck Semiconductor ETF put New 720 $27.6M
IWM iShares Russell 2000 ETF put Add +9.9% 1,000 $24.8M
ECHO Echostar Corp. Class A call Reduce -60.3% 1,583 $18.5M
NFLX Netflix Inc. call New 1,650 $15.9M
GDX Vaneck Gold Miners ETF call New 1,500 $13.8M
TEVA Teva Pharmaceutical-SP ADR call Sold out 3,000 $9.4Mbefore exit
HOOD Robinhood Markets Inc. Class A put Sold out 700 $7.9Mbefore exit
IBIT iShares Bitcoin Trust ETF put Sold out 1,500 $7.4Mbefore exit
FND Floor & Decor Holdings Inc. Class A call Sold out 800 $4.9Mbefore exit
RIVN Rivian Automotive Inc. Class A call Sold out 2,420 $4.8Mbefore exit
EEM iShares MSCI Emerging Market call Sold out 816 $4.5Mbefore exit
INTC Intel Corp. call New 1,000 $4.4M
EOSE Eos Energy Enterprises Inc. call Sold out 3,720 $4.3Mbefore exit
TERN Terns Pharmaceuticals Inc. call New 720 $3.8M
MRNA Moderna Inc. put Sold out 760 $2.2Mbefore exit
U Unity Software Inc. call Sold out 500 $2.2Mbefore exit
CDTX Cidara Therapeutics Inc. call Sold out 49 $1.1Mbefore exit

Calls and puts are listed by the shares they cover; their value is not part of the stock holdings above.

All Filings

QuarterPositions13F Reported ValueTop Holdings
Q2 2026 62$1.0BVRT, STX, AMD, LLY, INTC
Q1 2026 52$633.6MVRT, LLY, ISRG, ECHO, STX
Q4 2025 64$718.1MVRT, LLY, ISRG, TEVA, SHOP
Q3 2025 76$1.2BVRT, AMZN, MSFT, SPOT, MLM
Q2 2025 57$957.3MAMZN, VRT, MSFT, SPOT, MLM
Q1 2025 53$651.3MAMZN, MSFT, VRT, SPOT, LLY
Q4 2024 73$772.3MMSFT, VRT, AMZN, GKOS, INSP
Q3 2024 74$935.1MNVDA, MSFT, MELI, AMZN, VRT
Q2 2024 75$862.5MNVDA, MSFT, AMZN, VRT, MELI
Q1 2024 79$891.5MNVDA, SWAV, MSFT, VRT, INSP