Atika Capital Management LLC
Atika Capital Management LLC reported 62 US-listed holdings worth $1.01 billion in its 13F for the quarter ended 30 June 2026, filed 13 August 2026. Its largest: Vertiv Holdings Co. (22.1%), Seagate Technology Holdings plc (7.6%) and Advanced Micro Devices Inc. (5.5%). Against the quarter before, it opened 29 positions, added to 13, trimmed 11 and sold out of 19.
Reported holdings$1.01B+59.0% on Q1 2026
Positions62+10 on Q1 2026
The largest ten56.3%of its reported holdings
Latest 13FQ2 2026filed 13 August 2026
OpenedAdded toHeldTrimmed
The 14 largest of its 62 positions, each sized by its share of the reported holdings, coloured by the change in shares against Q1 2026.
What the fund reported holding at each quarter's end; hover a bar for the number of positions
What it did on the quarter
Opened 29Added 13Held 9Trimmed 11Sold out 19
Its positions against its 13F for the quarter to 31 March 2026; a change under 0.1% of a position counts as held
Opened 29
- Advanced Micro Devices Inc. AMD$55.5 million
- Intel Corp. INTC$36.9 million
- Vishay Precision Group Inc. VPG$17.7 million
- Marvell Technology, Inc. MRVL$17.3 million
- Revolution Medicines, Inc. RVMD$16.5 million
- Ascendis Pharma A/s ASND$16.3 million
- Axsome Therapeutics Inc. AXSM$15.4 million
- SharkNinja, Inc. SN$13.4 million
and 21 more in the table below
Added to 13
- Seagate Technology Holdings plc STX+26,365 shares · +49%
- EchoStar Corp. ECHO+149,400 shares · +82%
- Guardant Health Inc. GH+90,000 shares · +99%
- Rocket Lab Corp. RKLB+83,000 shares · +97%
- BBB Foods Inc. TBBB+154,782 shares · +163%
- the Realreal Inc. REAL+488,945 shares · +108%
- Dianthus Therapeutics Inc. DNTH+36,200 shares · +28%
- Ciena Corp. CIEN+5,117 shares · +12%
and 5 more in the table below
Trimmed 11
- Oruka Therapeutics Inc. ORKA-129,900 shares · -57%
- Mastec Inc. MTZ-22,136 shares · -38%
- TTM Technologies Inc. TTMI-43,000 shares · -46%
- Western Digital Corp. WDC-11,240 shares · -30%
- BWX Technologies, Inc. BWXT-28,550 shares · -35%
- Krystal Biotech, Inc. KRYS-4,625 shares · -44%
- Teva Pharmaceutical Industries Ltd. TEVA-37,000 shares · -8%
- Cogent Biosciences Inc. COGT-21,200 shares · -7%
and 3 more in the table below
Sold out of 19
- Terns Pharmaceuticals Inc. TERN$15.8 million last quarter
- Cloudflare Inc. NET$13.4 million last quarter
- Alphabet Inc. GOOG$12.4 million last quarter
- Vaneck ETF Trust GDX$7.3 million last quarter
- United Therapeutics Corp. UTHR$7.3 million last quarter
- Karman Holdings Inc. KRMN$7.2 million last quarter
- Clean Harbors Inc. CLH$6.3 million last quarter
- Talen Energy Corp. TLN$5.9 million last quarter
What it holds
| Company | Shares | Value | Of its book | Change in shares |
|---|---|---|---|---|
| Vertiv Holdings Co. VRT | 666,100 | $223.0 million | 22.13% | no change |
| Seagate Technology Holdings plc STX | 79,865 | $77.1 million | 7.65% | +26,365 |
| Advanced Micro Devices Inc. AMD | 95,500 | $55.5 million | 5.50% | new |
| Eli Lilly & Co. LLY | 41,100 | $49.3 million | 4.89% | no change |
| Intel Corp. INTC | 264,000 | $36.9 million | 3.66% | new |
| EchoStar Corp. ECHO | 331,400 | $33.6 million | 3.34% | +149,400 |
| Guardant Health Inc. GH | 181,000 | $27.2 million | 2.69% | +90,000 |
| Ciena Corp. CIEN | 48,768 | $23.9 million | 2.37% | +5,117 |
| Intuitive Surgical Inc. ISRG | 57,216 | $22.8 million | 2.26% | no change |
| Vishay Precision Group Inc. VPG | 118,000 | $17.7 million | 1.76% | new |
| Marvell Technology, Inc. MRVL | 58,000 | $17.3 million | 1.71% | new |
| Rocket Lab Corp. RKLB | 169,000 | $17.2 million | 1.70% | +83,000 |
| Western Digital Corp. WDC | 26,477 | $16.9 million | 1.68% | -11,240 |
| Revolution Medicines, Inc. RVMD | 88,000 | $16.5 million | 1.64% | new |
| Ascendis Pharma A/s ASND | 61,000 | $16.3 million | 1.61% | new |
| Dianthus Therapeutics Inc. DNTH | 165,000 | $16.1 million | 1.60% | +36,200 |
| Axsome Therapeutics Inc. AXSM | 63,000 | $15.4 million | 1.53% | new |
| Teva Pharmaceutical Industries Ltd. TEVA | 440,000 | $14.9 million | 1.48% | -37,000 |
| Mastec Inc. MTZ | 35,500 | $14.8 million | 1.47% | -22,136 |
| SharkNinja, Inc. SN | 88,000 | $13.4 million | 1.33% | new |
| Netflix Inc. NFLX | 180,000 | $12.9 million | 1.28% | no change |
| Curtiss Wright Corp. CW | 16,000 | $12.1 million | 1.20% | +3,000 |
| Kymera Therapeutics Inc. KYMR | 104,000 | $11.9 million | 1.18% | new |
| Sitime Corp. SITM | 15,000 | $11.2 million | 1.11% | +195 |
| Twist Bioscience Corp. TWST | 108,000 | $11.1 million | 1.10% | new |
| the Realreal Inc. REAL | 940,000 | $11.1 million | 1.10% | +488,945 |
| Cogent Biosciences Inc. COGT | 272,000 | $10.5 million | 1.04% | -21,200 |
| BWX Technologies, Inc. BWXT | 54,000 | $10.5 million | 1.04% | -28,550 |
| Amazon.com Inc. AMZN | 44,000 | $10.5 million | 1.04% | +300 |
| BBB Foods Inc. TBBB | 250,000 | $10.4 million | 1.03% | +154,782 |
| Axogen Inc. AXGN | 221,000 | $10.2 million | 1.01% | new |
| Nokia Corporation NOK | 750,000 | $10.0 million | 0.99% | new |
| Oruka Therapeutics Inc. ORKA | 100,000 | $9.5 million | 0.94% | -129,900 |
| TTM Technologies Inc. TTMI | 50,000 | $9.4 million | 0.93% | -43,000 |
| Charles River Laboratories International, Inc. CRL | 38,000 | $8.6 million | 0.86% | new |
| ACM Research, Inc. ACMR | 63,000 | $8.0 million | 0.79% | new |
| Roivant Sciences Ltd. ROIV | 217,000 | $7.7 million | 0.76% | new |
| MercadoLibre, Inc. MELI | 4,510 | $7.7 million | 0.76% | no change |
| Appfolio Inc. APPF | 47,500 | $7.6 million | 0.76% | no change |
| Protagonist Therapeutics, Inc. PTGX | 62,100 | $7.6 million | 0.76% | no change |
| Reddit, Inc. RDDT | 43,000 | $7.5 million | 0.74% | new |
| Semtech Corp. SMTC | 46,000 | $7.4 million | 0.74% | new |
| Five Below, Inc. FIVE | 40,000 | $7.2 million | 0.71% | +520 |
| Ferguson Enterprises Inc. FERG | 29,300 | $7.0 million | 0.69% | no change |
| Definium Therapeutics Inc. DFTX | 122,000 | $5.7 million | 0.57% | new |
| Immunome Inc. IMNM | 262,900 | $5.6 million | 0.55% | no change |
| Hut 8 Corp. HUT | 44,500 | $5.1 million | 0.51% | -4,800 |
| Warby Parker Inc. WRBY | 150,000 | $4.6 million | 0.45% | +15,000 |
| Jatt II Acquisition Corp. JATT | 400,000 | $4.5 million | 0.45% | new |
| Praxis Precision Medicines I PRAX | 12,900 | $4.3 million | 0.43% | new |
| Nlight Inc. LASR | 55,000 | $3.8 million | 0.38% | -11,000 |
| Abivax SA ABVX | 27,000 | $3.6 million | 0.36% | -1,800 |
| Alkermes plc. ALKS | 55,571 | $2.9 million | 0.29% | new |
| CrowdStrike Holdings, Inc. CRWD | 3,800 | $2.9 million | 0.29% | new |
| Tarsus Pharmaceuticals Inc. TARS | 40,000 | $2.5 million | 0.25% | new |
| Krystal Biotech, Inc. KRYS | 6,000 | $2.2 million | 0.22% | -4,625 |
| Vericel Corp. VCEL | 34,000 | $1.5 million | 0.15% | new |
| Veradermics Inc MANE | 12,000 | $1.5 million | 0.15% | new |
| Kiniksa Pharmaceuticals Intl KNSA | 23,000 | $1.5 million | 0.15% | new |
| Sweetgreen Inc. SG | 120,000 | $1.1 million | 0.10% | new |
| Sandisk Corp. SNDK | 303 | $688,940 | 0.07% | new |
| Stubhub Hldgs Inc. STUB | 50,000 | $643,500 | 0.06% | new |
Every US-listed position in the fund's 13F for the quarter ended 30 June 2026, by the value it reported.
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Change is shares against its 13F for the quarter before; the 19 it sold out of are in the box above.Options it reported
| Company | Option | Shares under the options | Value of those shares |
|---|---|---|---|
| SPDR Ser Trust XBI | Puts | 5,625 | $89.0 million |
| Invesco QQQ Trust QQQ | Puts | 1,000 | $73.6 million |
| GE Vernova Inc. GEV | Puts | 500 | $58.7 million |
| Amazon.com Inc. AMZN | Calls | 2,220 | $52.9 million |
| Invesco QQQ Trust QQQ | Calls | 660 | $48.6 million |
| Micron Technology Inc. MU | Puts | 300 | $34.6 million |
| Vaneck ETF Trust SMH | Puts | 510 | $33.5 million |
| iShares Trust IGV | Puts | 2,720 | $24.6 million |
| British American Tobacco p.l.c. BTI | Calls | 3,300 | $20.4 million |
| iShares Bitcoin Trust ETF IBIT | Puts | 6,000 | $20.0 million |
| Roundhill ETF Trust DRAM | Puts | 2,100 | $15.5 million |
| Stubhub Hldgs Inc. STUB | Calls | 9,000 | $11.6 million |
| Alkermes plc. ALKS | Calls | 1,600 | $8.4 million |
| EchoStar Corp. ECHO | Calls | 709 | $7.2 million |
| Enphase Energy, Inc. ENPH | Calls | 1,200 | $5.9 million |
| Coreweave Inc. CRWV | Calls | 350 | $3.5 million |
| Teva Pharmaceutical Industries Ltd. TEVA | Calls | 1,000 | $3.4 million |
| Cleveland-Cliffs Inc. CLF | Calls | 1,500 | $1.4 million |
| Keel Infrastructure Corp. Com SHS KEEL | Calls | 1,500 | $861,000 |
19 option lines. A 13F lists calls and puts by the shares they cover and what those shares were worth at the quarter's end, not what the options cost; they are not counted in the holdings above.