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Atika Capital Management LLC — 13F Holdings & Portfolio

CIK 1599731 · latest 13F-HR filed 2026-08-13

Backtest portfolio

Atika Capital Management LLC manages $1.52B in 13F-reported U.S. long-equity assets across 243 reported positions as of its 2026-06-30 13F-HR filing. Its largest disclosed positions are VRT (8.50%), VRT (4.20%), XBI (3.41%). Quarter over quarter (versus its 2026-03-31 filing) the fund opened 29 new positions and exited 19; 18 existing positions rose in reported value and 8 fell.

AUM is the long-equity portion reported on Form 13F-HR. Excludes short positions, cash, foreign holdings, and non-13F assets. For informational purposes only — not investment advice.

Loading holdings…
AUM
$1.52B

Long-equity book

Holdings
243

Distinct positions

Period
2026-06-30

Filed 2026-08-13

Q/Q Activity
+29 / −19 / ↑18 / ↓8

vs 2026-03-31

Portfolio charts

Latest quarter's book, what changed, and how the portfolio has evolved across filings.

Portfolio map

Q2 26
VRT22.1% · 0%STX7.6% · +49%AMD5.5% · newLLY4.9% · 0%INTC3.7% · newECHO3.3% · newGH2.7% · +99%CIEN2.4% · +12%ISRG2.3% · 0%VPG1.8% · newMRVL1.7% · newRKLB1.7% · +96%WDC1.7% · -30%RVMD1.6% · newASND1.6% · +219%DNTH1.6% · +28%AXSM1.5% · newTEVA1.5% · -8%MTZ1.5% · -38%SN1.3% · newNFLX1.3% · 0%CW1.2% · +23%KYMR1.2% · newSITM1.1% · +1%TWST1.1% · newREAL1.1% · +108%COGT1.0% · -7%BWXT1.0% · -35%AMZN1.0% · +1%TBBB1.0% · +163%AXGN1.0% · newNOK1.0% · newORKA0.9% · -56%TTMI0.9% · -46%CRL0.9% · newACMR0.8% · newROIV0.8% · newMELI0.8% · 0%APPF0.8% · 0%PTGX0.8% · 0%RDDT0.7% · newSMTC0.7% · newFIVE0.7% · +1%FERG0.7% · 0%DFTX0.6% · newIMNM0.6% · 0%HUT0.5% · -10%WRBY0.5% · +11%JATT0.5% · newPRAX0.4% · newLASR0.4% · -17%ABVX0.4% · -6%ALKS0.3% · newCRWD0.3% · newTARS0.2% · newKRYS0.2% · -44%VCEL0.1% · newMANE0.1% · newKNSA0.1% · newSG0.1% · new

Box size = position value; colour = change in share count vs the prior quarter (green added, red trimmed, blue new). Rows split across managers or share classes are combined. Click a box for the stock.

Sector mix

% of 13F value

Sectors from each company's SIC code; funds and ETFs grouped separately.

Biggest buys and sells

Q1 26 → Q2 26

Estimated from the change in shares held × the quarter-end price, so price moves alone don't count as buying. New and exited positions are included.

13F assets and positions

4 quarters

Total reported 13F value (bars) and number of positions (line) each quarter. Value changes include market moves.

Top positions over time

reported value

The eight largest current positions, valued at each quarter end.

Concentration

top 10 = 56.3%

Cumulative share of the portfolio held in the largest N positions.

Firm Profile & Key People
Assets Under Management
$887.3M
Discretionary
$887.3M
Employees
9
Accounts
6
Address
475 TENTH AVENUE
14TH FLOOR
NEW YORK, NY 10018
Phone
(212) 408-2710
Website
Name Title / Status Ownership Type
FARBER, BRADLEY, SETH ControlMANAGING MEMBER75% or moreIndividual
VOGEL, AVI, NMN ControlCHIEF FINANCIAL OFFICER / CHIEF COMPLIANCE OFFICERLess than 5%Individual

Quarter-over-quarter changes

Changes in reported position value vs the prior 13F, so price moves count too, not just shares bought or sold.

Atika Capital Management LLC Holdings (2026-06-30)

Rows tagged Call or Put are options positions, not stock. Per SEC Form 13F-HR, Value shows the notional value of the underlying (shares covered × underlying price), not the option premium. Shares is the number of underlying shares covered (divide by 100 for contract count).

# Issuer Symbol CUSIP Value Weight Shares Type
1 VERTIV HOLDINGS CO VRT 92537N108 $129.3M 8.50% 386,059 SH
2 VERTIV HOLDINGS CO VRT 92537N108 $64.0M 4.20% 191,027 SH
3 SPDR SERIES TRUST Put XBI 78464A870 $51.9M 3.41% 3,279 SH
4 SEAGATE TECHNOLOGY HLDNGS PL STX G7997R103 $43.8M 2.88% 45,417 SH
5 INVESCO QQQ TR Put QQQ 46090E103 $42.9M 2.82% 582 SH
6 GE VERNOVA INC Put GEV 36828A101 $34.3M 2.25% 292 SH
7 ADVANCED MICRO DEVICES INC AMD 007903107 $32.3M 2.13% 55,674 SH
8 AMAZON COM INC Call AMZN 023135106 $30.8M 2.03% 1,293 SH
9 VERTIV HOLDINGS CO VRT 92537N108 $29.8M 1.96% 89,014 SH
10 ELI LILLY & CO LLY 532457108 $28.7M 1.89% 23,931 SH
11 INVESCO QQQ TR Call QQQ 46090E103 $28.4M 1.86% 385 SH
12 SPDR SERIES TRUST Put XBI 78464A870 $22.2M 1.46% 1,402 SH
13 INTEL CORP INTC 458140100 $21.5M 1.41% 153,824 SH
14 SEAGATE TECHNOLOGY HLDNGS PL STX G7997R103 $20.8M 1.37% 21,535 SH
15 MICRON TECHNOLOGY INC Put MU 595112103 $20.2M 1.33% 175 SH
16 ECHOSTAR CORP ECHO 278768106 $19.7M 1.30% 194,147 SH
17 VANECK ETF TRUST Put SMH 92189F676 $19.5M 1.28% 297 SH
18 INVESCO QQQ TR Put QQQ 46090E103 $18.3M 1.20% 248 SH
19 GUARDANT HEALTH INC GH 40131M109 $15.5M 1.02% 103,631 SH
20 SPDR SERIES TRUST Put XBI 78464A870 $14.9M 0.98% 944 SH
21 GE VERNOVA INC Put GEV 36828A101 $14.8M 0.97% 126 SH
22 ISHARES TR Put IGV 464287515 $14.4M 0.95% 1,587 SH
23 ELI LILLY & CO LLY 532457108 $14.2M 0.93% 11,853 SH
24 ADVANCED MICRO DEVICES INC AMD 007903107 $14.0M 0.92% 24,130 SH
25 CIENA CORP CIEN 171779309 $13.5M 0.89% 27,590 SH
26 AMAZON COM INC Call AMZN 023135106 $13.1M 0.86% 551 SH
27 INTUITIVE SURGICAL INC ISRG 46120E602 $13.1M 0.86% 32,976 SH
28 INVESCO QQQ TR Put QQQ 46090E103 $12.5M 0.82% 170 SH
29 SEAGATE TECHNOLOGY HLDNGS PL STX G7997R103 $12.5M 0.82% 12,913 SH
30 INVESCO QQQ TR Call QQQ 46090E103 $12.1M 0.79% 164 SH
31 BRITISH AMERN TOB PLC Call BTI 110448107 $11.9M 0.78% 1,924 SH
32 ISHARES BITCOIN TRUST ETF Put IBIT 46438F101 $11.7M 0.77% 3,500 SH
33 VISHAY PRECISION GROUP INC VPG 92835K103 $10.3M 0.68% 68,840 SH
34 MARVELL TECHNOLOGY INC MRVL 573874104 $10.1M 0.66% 33,810 SH
35 ROCKET LAB CORP RKLB 773121108 $10.0M 0.66% 98,432 SH
36 WESTERN DIGITAL CORP WDC 958102105 $9.8M 0.65% 15,421 SH
37 GE VERNOVA INC Put GEV 36828A101 $9.6M 0.63% 82 SH
38 REVOLUTION MEDICINES INC RVMD 76155X100 $9.6M 0.63% 51,298 SH
39 ASCENDIS PHARMA A/S ASND K08588103 $9.5M 0.62% 35,588 SH
40 DIANTHUS THERAPEUTICS INC DNTH 252828108 $9.4M 0.62% 96,612 SH
41 INTEL CORP INTC 458140100 $9.3M 0.61% 66,814 SH
42 ADVANCED MICRO DEVICES INC AMD 007903107 $9.1M 0.60% 15,696 SH
43 ROUNDHILL ETF TRUST Put DRAM 77926X320 $9.0M 0.59% 1,225 SH
44 AXSOME THERAPEUTICS INC. AXSM 05464T104 $9.0M 0.59% 36,754 SH
45 AMAZON COM INC Call AMZN 023135106 $9.0M 0.59% 376 SH
46 MICRON TECHNOLOGY INC Put MU 595112103 $8.8M 0.58% 76 SH
47 TEVA PHARMACEUTICAL INDS LTD TEVA 881624209 $8.7M 0.57% 256,685 SH
48 MASTEC INC MTZ 576323109 $8.6M 0.57% 20,694 SH
49 ECHOSTAR CORP ECHO 278768106 $8.6M 0.57% 84,770 SH
50 VANECK ETF TRUST Put SMH 92189F676 $8.3M 0.55% 127 SH
Filing History
Period Filed AUM Holdings Accession
2026-06-30 2026-08-13 $1.52B 243 0001214659-26-010035
2026-03-31 2026-05-14 $796.4M 180 0001214659-26-006119
2025-12-31 2026-02-13 $949.8M 231 0001214659-26-001658
2025-09-30 2025-11-13 $1.24B 258 0001214659-25-016379
Filer Information
Address
475 TENTH AVENUE, 14TH FLOOR
NEW YORK, NY 10018
Phone
(212) 408-2700
Filing Manager
Atika Capital Management LLC
NEW YORK, NY
Signatory
Brad Farber
Managing Member