Top Institutional Investors

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, exited 19, added to 18, and trimmed 8.

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.

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
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

Firm Profile & Key People
Name Title / Status Ownership Type

Top Adds (vs prior quarter)

  • VERTIV HOLDINGS CO$56.1M +33.6%
  • SEAGATE TECHNOLOGY HLDNGS PL$56.1M +267.7%
  • GUARDANT HEALTH INC$18.7M +223.1%
  • ECHOSTAR CORP$12.3M +57.9%
  • ROCKET LAB CORP$11.7M +211.0%
Show all 18 →

Top Trims

  • BWX TECHNOLOGIES INC-$6.4M -37.7%
  • NETFLIX INC.-$4.5M -25.7%
  • MASTEC INC-$3.8M -20.4%
  • INTUITIVE SURGICAL INC-$3.6M -13.7%
  • FIVE BELOW INC-$1.8M -20.3%
Show all 8 →

New Positions

  • ADVANCED MICRO DEVICES INC$55.5M
  • INTEL CORP$36.9M
  • VISHAY PRECISION GROUP INC$17.7M
  • MARVELL TECHNOLOGY INC$17.3M
  • REVOLUTION MEDICINES INC$16.5M
Show all 29 →

Exited Positions

  • TERNS PHARMACEUTICALS INC$15.8M
  • CLOUDFLARE INC$13.4M
  • ALPHABET INC$12.4M
  • VANECK ETF TRUST$7.3M
  • UNITED THERAPEUTICS CORP DEL$7.3M
Show all 19 →
All Holdings

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