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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.

This manager's most recent filing is 3934 quarter(s) behind the newest quarter on file. Treat these figures as history, not current positioning.
$1.0bnreported US equity book
62positions
22.1%largest position
56.3%top 10 weight
14.35effective positions (1/HHI)
2quarters on file since Q1 2026

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.

#StockSectorWeightValueSharesΔ sharesAction
1 VRT VERTIV HOLDINGS CO Industrials 22.1%$223.0m666,100 0% held
2 STX SEAGATE TECHNOLOGY HLDNGS PL Technology 7.6%$77.1m79,865 49% added
3 AMD ADVANCED MICRO DEVICES INC Technology 5.5%$55.5m95,500 new
4 LLY ELI LILLY & CO Healthcare 4.9%$49.3m41,100 0% held
5 INTC INTEL CORP Technology 3.7%$36.9m264,000 new
6 ECHO ECHOSTAR CORP Communication Services 3.3%$33.6m331,400 82% added
7 GH GUARDANT HEALTH INC Healthcare 2.7%$27.2m181,000 99% added
8 CIEN CIENA CORP Technology 2.4%$23.9m48,768 12% added
9 ISRG INTUITIVE SURGICAL INC Healthcare 2.3%$22.8m57,216 0% held
10 VPG VISHAY PRECISION GROUP INC Technology 1.8%$17.7m118,000 new
11 MRVL MARVELL TECHNOLOGY INC Technology 1.7%$17.3m58,000 new
12 RKLB ROCKET LAB CORP Industrials 1.7%$17.2m169,000 97% added
13 WDC WESTERN DIGITAL CORP Technology 1.7%$16.9m26,477 -30% reduced
14 RVMD REVOLUTION MEDICINES INC Healthcare 1.6%$16.5m88,000 new
15 ASND ASCENDIS PHARMA A/S Healthcare 1.6%$16.3m61,000 new
16 DNTH DIANTHUS THERAPEUTICS INC Healthcare 1.6%$16.1m165,000 28% added
17 AXSM AXSOME THERAPEUTICS INC. Healthcare 1.5%$15.4m63,000 new
18 TEVA TEVA PHARMACEUTICAL INDS LTD Healthcare 1.5%$14.9m440,000 -8% reduced
19 MTZ MASTEC INC Industrials 1.5%$14.8m35,500 -38% reduced
20 SN SHARKNINJA INC Consumer Cyclical 1.3%$13.4m88,000 new
21 NFLX NETFLIX INC. Communication Services 1.3%$12.9m180,000 0% held
22 CW CURTISS WRIGHT CORP Industrials 1.2%$12.1m16,000 23% added
23 KYMR KYMERA THERAPEUTICS INC Healthcare 1.2%$11.9m104,000 new
24 SITM SITIME CORP Technology 1.1%$11.2m15,000 1% added
25 TWST TWIST BIOSCIENCE CORP Healthcare 1.1%$11.1m108,000 new
26 REAL THE REALREAL INC Consumer Cyclical 1.1%$11.1m940,000 108% added
27 COGT COGENT BIOSCIENCES INC Healthcare 1.0%$10.5m272,000 -7% reduced
28 BWXT BWX TECHNOLOGIES INC Industrials 1.0%$10.5m54,000 -35% reduced
29 AMZN AMAZON COM INC Consumer Cyclical 1.0%$10.5m44,000 1% added
30 TBBB BBB FOODS INC Consumer Defensive 1.0%$10.4m250,000 163% added
31 AXGN AXOGEN INC Healthcare 1.0%$10.2m221,000 new
32 NOK NOKIA CORP Technology 1.0%$10.0m750,000 new
33 ORKA ORUKA THERAPEUTICS INC Healthcare 0.9%$9.5m100,000 -57% reduced
34 TTMI TTM TECHNOLOGIES INC Technology 0.9%$9.4m50,000 -46% reduced
35 CRL CHARLES RIV LABS INTL INC Healthcare 0.9%$8.6m38,000 new
36 ACMR ACM RESH INC Technology 0.8%$8.0m63,000 new
37 ROIV ROIVANT SCIENCES LTD Healthcare 0.8%$7.7m217,000 new
38 MELI MERCADOLIBRE INC Consumer Cyclical 0.8%$7.7m4,510 0% held
39 APPF APPFOLIO INC Technology 0.8%$7.6m47,500 0% held
40 PTGX PROTAGONIST THERAPEUTICS INC Healthcare 0.8%$7.6m62,100 0% held
41 RDDT REDDIT INC Communication Services 0.7%$7.5m43,000 new
42 SMTC SEMTECH CORP Technology 0.7%$7.4m46,000 new
43 FIVE FIVE BELOW INC Consumer Cyclical 0.7%$7.2m40,000 1% added
44 FERG FERGUSON ENTERPRISES INC Industrials 0.7%$7.0m29,300 0% held
45 DFTX DEFINIUM THERAPEUTICS INC Healthcare 0.6%$5.7m122,000 new
46 IMNM IMMUNOME INC Healthcare 0.6%$5.6m262,900 0% held
47 HUT HUT 8 CORP Financial Services 0.5%$5.1m44,500 -10% reduced
48 WRBY WARBY PARKER INC Healthcare 0.5%$4.6m150,000 11% added
49 JATT II ACQUISITION CORP 0.5%$4.5m400,000 new
50 PRAX PRAXIS PRECISION MEDICINES I Healthcare 0.4%$4.3m12,900 new

What did Atika Capital Management LLC sell? Positions exited since the previous filing

StockPrior weightPrior value
430 TERNS PHARMACEUTICALS INC13.1%$15.8m
NET CLOUDFLARE INC11.1%$13.4m
GOOG ALPHABET INC10.3%$12.4m
GDX VANECK ETF TRUST6.1%$7.3m
UTHR UNITED THERAPEUTICS CORP DEL6.1%$7.3m
KRMN KARMAN HLDGS INC6.0%$7.2m
CLH CLEAN HARBORS INC5.2%$6.3m
TLN TALEN ENERGY CORP4.9%$5.9m
META META PLATFORMS INC4.7%$5.7m
DBVT DBV TECHNOLOGIES S A4.7%$5.7m
HEI HEICO CORP NEW4.4%$5.3m
QXO QXO INC4.2%$5.1m
GE GE AEROSPACE3.6%$4.4m
ASND ASCENDIS PHARMA A/S3.6%$4.4m
XENE XENON PHARMACEUTICALS INC2.9%$3.5m
MAZE MAZE THERAPEUTICS INC2.8%$3.3m
ACHC ACADIA HEALTHCARE COMPANY IN2.4%$2.9m
BBIO BRIDGEBIO PHARMA INC2.2%$2.6m
HEI/A HEICO CORP NEW1.8%$2.2m

Sector mix

SectorWeight
Technology30.4%
Healthcare28.8%
Industrials28.2%
Communication Services5.4%
Consumer Cyclical5.0%
Consumer Defensive1.0%

Sectors cover positions whose ticker resolved to a sector; the remainder is unclassified, not cash.

Filing history

QuarterPositionsEquity value
Q2 2026186$1.0bn
Q1 2026156$633.6m

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.