Atika Capital Management LLC

NEW YORK, NY · CIK 1599731 · 13F filing filed 2026-08-13

No investment adviser registration (Form ADV) found for this filer. It may be a parent company whose subsidiaries are the registered advisers, a bank or insurer, or a manager based outside the US.

Legal entityATIKA CAPITAL MANAGEMENT LLC (US)

$1.0bn reported value +59.0% vs Q1 2026

62positions

56.3%in top 10

29 new 13 added 11 reduced 19 sold out vs Q1 2026

Options: 11 call positions ($164.1m notional), 8 put positions ($349.6m notional) – listed below, not included above.

This report includes the holdings of 2 other managers that share the investment decisions:

Atika Capital Partners LP – reports through this filing
Optika Master Portfolio Ltd – reports through this filing

Shares in two reports are counted once in each security's totals.

Holdings, Q2 2026

The small lines show how much was held over the last 4 quarters (adjusted for stock splits).

#	Security	Ticker	Shares	Value	% of portfolio	Change	Shares change
1	VERTIV HOLDINGS CO COM CL A VRT	VRT	666,100	$223.0m22.13%	22.13%	Unchanged
2	SEAGATE TECHNOLOGY HLDNGS PL ORD SHS STX	STX	79,865	$77.1m7.65%	7.65%	Added +26.4k	+26,365 49.3%
3	ADVANCED MICRO DEVICES INC COM AMD	AMD	95,500	$55.5m5.50%	5.50%	New
4	ELI LILLY & CO COM LLY	LLY	41,100	$49.3m4.89%	4.89%	Unchanged
5	INTEL CORP COM INTC	INTC	264,000	$36.9m3.66%	3.66%	New
6	ECHOSTAR CORP CL A ECHO	ECHO	331,400	$33.6m3.34%	3.34%	Added +149.4k	+149,400 82.1%
7	GUARDANT HEALTH INC COM GH	GH	181,000	$27.2m2.69%	2.69%	Added +90.0k	+90,000 98.9%
8	CIENA CORP COM NEW CIEN	CIEN	48,768	$23.9m2.37%	2.37%	Added +5.1k	+5,117 11.7%
9	INTUITIVE SURGICAL INC COM NEW ISRG	ISRG	57,216	$22.8m2.26%	2.26%	Unchanged
10	VISHAY PRECISION GROUP INC COM VPG	VPG	118,000	$17.7m1.76%	1.76%	New
11	MARVELL TECHNOLOGY INC COM MRVL	MRVL	58,000	$17.3m1.71%	1.71%	New
12	ROCKET LAB CORP COM RKLB	RKLB	169,000	$17.2m1.70%	1.70%	Added +83.0k	+83,000 96.5%
13	WESTERN DIGITAL CORP COM WDC	WDC	26,477	$16.9m1.68%	1.68%	Reduced -11.2k	-11,240 -29.8%
14	REVOLUTION MEDICINES INC COM RVMD	RVMD	88,000	$16.5m1.64%	1.64%	New
15	ASCENDIS PHARMA A/S ORD SHS ASND	ASND	61,000	$16.3m1.61%	1.61%	New
16	DIANTHUS THERAPEUTICS INC COM DNTH	DNTH	165,000	$16.1m1.60%	1.60%	Added +36.2k	+36,200 28.1%
17	AXSOME THERAPEUTICS INC COM AXSM	AXSM	63,000	$15.4m1.53%	1.53%	New
18	TEVA PHARMACEUTICAL INDS LTD SPONSORED ADS SPONSORED ADS		440,000	$14.9m1.48%	1.48%	Reduced -37.0k	-37,000 -7.8%
19	MASTEC INC COM MTZ	MTZ	35,500	$14.8m1.47%	1.47%	Reduced -22.1k	-22,136 -38.4%
20	SHARKNINJA INC COM SHS SN	SN	88,000	$13.4m1.33%	1.33%	New
21	NETFLIX INC COM NFLX	NFLX	180,000	$12.9m1.28%	1.28%	Unchanged
22	CURTISS WRIGHT CORP COM CW	CW	16,000	$12.1m1.20%	1.20%	Added +3.0k	+3,000 23.1%
23	KYMERA THERAPEUTICS INC COM KYMR	KYMR	104,000	$11.9m1.18%	1.18%	New
24	SITIME CORP COM SITM	SITM	15,000	$11.2m1.11%	1.11%	Added +195	+195 1.3%
25	TWIST BIOSCIENCE CORP COM TWST	TWST	108,000	$11.1m1.10%	1.10%	New
26	THE REALREAL INC COM REAL	REAL	940,000	$11.1m1.10%	1.10%	Added +488.9k	+488,945 108.4%
27	COGENT BIOSCIENCES INC COM COGT	COGT	272,000	$10.5m1.04%	1.04%	Reduced -21.2k	-21,200 -7.2%
28	BWX TECHNOLOGIES INC COM BWXT	BWXT	54,000	$10.5m1.04%	1.04%	Reduced -28.6k	-28,550 -34.6%
29	AMAZON COM INC COM AMZN	AMZN	44,000	$10.5m1.04%	1.04%	Added +300	+300 0.7%
30	BBB FOODS INC CL A COM TBBB	TBBB	250,000	$10.4m1.03%	1.03%	Added +154.8k	+154,782 162.6%
31	AXOGEN INC COM AXGN	AXGN	221,000	$10.2m1.01%	1.01%	New
32	NOKIA CORP SPONSORED ADR NOK	NOK	750,000	$10.0m0.99%	0.99%	New
33	ORUKA THERAPEUTICS INC COM ORKA	ORKA	100,000	$9.5m0.94%	0.94%	Reduced -129.9k	-129,900 -56.5%
34	TTM TECHNOLOGIES INC COM TTMI	TTMI	50,000	$9.4m0.93%	0.93%	Reduced -43.0k	-43,000 -46.2%
35	CHARLES RIV LABS INTL INC COM CRL	CRL	38,000	$8.6m0.86%	0.86%	New
36	ACM RESH INC COM CL A ACMR	ACMR	63,000	$8.0m0.79%	0.79%	New
37	ROIVANT SCIENCES LTD SHS ROIV	ROIV	217,000	$7.7m0.76%	0.76%	New
38	MERCADOLIBRE INC COM MELI	MELI	4,510	$7.7m0.76%	0.76%	Unchanged
39	APPFOLIO INC COM CL A APPF	APPF	47,500	$7.6m0.76%	0.76%	Unchanged
40	PROTAGONIST THERAPEUTICS INC COM PTGX	PTGX	62,100	$7.6m0.76%	0.76%	Unchanged
41	REDDIT INC CL A RDDT	RDDT	43,000	$7.5m0.74%	0.74%	New
42	SEMTECH CORP COM SMTC	SMTC	46,000	$7.4m0.74%	0.74%	New
43	FIVE BELOW INC COM FIVE	FIVE	40,000	$7.2m0.71%	0.71%	Added +520	+520 1.3%
44	FERGUSON ENTERPRISES INC COMMON STOCK NEW FERG	FERG	29,300	$7.0m0.69%	0.69%	Unchanged
45	DEFINIUM THERAPEUTICS INC COM SHS DFTX	DFTX	122,000	$5.7m0.57%	0.57%	New
46	IMMUNOME INC COM IMNM	IMNM	262,900	$5.6m0.55%	0.55%	Unchanged
47	HUT 8 CORP COM HUT	HUT	44,500	$5.1m0.51%	0.51%	Reduced -4.8k	-4,800 -9.7%
48	WARBY PARKER INC CL A COM WRBY	WRBY	150,000	$4.6m0.45%	0.45%	Added +15.0k	+15,000 11.1%
49	JATT II ACQUISITION CORP ORD SHS JATT	JATT	400,000	$4.5m0.45%	0.45%	New
50	PRAXIS PRECISION MEDICINES I COM NEW PRAX	PRAX	12,900	$4.3m0.43%	0.43%	New
51	NLIGHT INC COM LASR	LASR	55,000	$3.8m0.38%	0.38%	Reduced -11.0k	-11,000 -16.7%
52	ABIVAX SA SPONSORED ADS ABVX	ABVX	27,000	$3.6m0.36%	0.36%	Reduced -1.8k	-1,800 -6.2%
53	ALKERMES PLC SHS ALKS	ALKS	55,571	$2.9m0.29%	0.29%	New
54	CROWDSTRIKE HLDGS INC CL A CRWD	CRWD	3,800	$2.9m0.29%	0.29%	New
55	TARSUS PHARMACEUTICALS INC COM TARS	TARS	40,000	$2.5m0.25%	0.25%	New
56	KRYSTAL BIOTECH INC COM KRYS	KRYS	6,000	$2.2m0.22%	0.22%	Reduced -4.6k	-4,625 -43.5%
57	VERICEL CORP COM VCEL	VCEL	34,000	$1.5m0.15%	0.15%	New
58	VERADERMICS INC COMMON STOCK MANE	MANE	12,000	$1.5m0.15%	0.15%	New
59	KINIKSA PHARMACEUTICALS INTL ORD SHS CL A KNSA	KNSA	23,000	$1.5m0.15%	0.15%	New
60	SWEETGREEN INC COM CL A SG	SG	120,000	$1.1m0.10%	0.10%	New
61	SANDISK CORP COM SNDK	SNDK	303	$688.9k0.07%	0.07%	New
62	STUBHUB HLDGS INC CL A STUB	STUB	50,000	$643.5k0.06%	0.06%	New

Sold out since Q1 2026

Security	Ticker	Shares held before	Value then
TERNS PHARMACEUTICALS INC		300,000	$15.8m300.0k shares
CLOUDFLARE INC NET	NET	65,000	$13.4m65.0k shares
ALPHABET INC GOOG	GOOG	43,250	$12.4m43.2k shares
VANECK ETF TRUST GDX	GDX	80,000	$7.3m80.0k shares
UNITED THERAPEUTICS CORP DEL UTHR	UTHR	12,350	$7.3m12.3k shares
KARMAN HLDGS INC KRMN	KRMN	90,500	$7.2m90.5k shares
CLEAN HARBORS INC CLH	CLH	21,855	$6.3m21.9k shares
TALEN ENERGY CORP TLN	TLN	18,490	$5.9m18.5k shares
META PLATFORMS INC META	META	10,000	$5.7m10.0k shares
DBV TECHNOLOGIES S A DBVT	DBVT	271,300	$5.7m271.3k shares
HEICO CORP NEW HEI	HEI	19,265	$5.3m19.3k shares
QXO INC QXO	QXO	264,253	$5.1m264.3k shares
GE AEROSPACE GE	GE	15,510	$4.4m15.5k shares
ASCENDIS PHARMA A/S		19,125	$4.4m19.1k shares
XENON PHARMACEUTICALS INC XENE	XENE	59,900	$3.5m59.9k shares
MAZE THERAPEUTICS INC MAZE	MAZE	111,500	$3.3m111.5k shares
ACADIA HEALTHCARE COMPANY IN ACHC	ACHC	122,600	$2.9m122.6k shares
BRIDGEBIO PHARMA INC BBIO	BBIO	35,200	$2.6m35.2k shares
HEICO CORP NEW HEI.A	HEI.A	10,575	$2.2m10.6k shares

Options (notional value)

Underlying	Ticker	Type	Shares controlled	Notional	Change
SPDR SER TR XBI · Put	XBI	Put	5,625	$89.0m5.6k shares	Added
INVESCO QQQ TR QQQ · Put	QQQ	Put	1,000	$73.6m1.0k shares	New
GE VERNOVA INC GEV · Put	GEV	Put	500	$58.7m500 shares	New
AMAZON COM INC AMZN · Call	AMZN	Call	2,220	$52.9m2.2k shares	New
INVESCO QQQ TR QQQ · Call	QQQ	Call	660	$48.6m660 shares	New
MICRON TECHNOLOGY INC MU · Put	MU	Put	300	$34.6m300 shares	New
VANECK ETF TRUST SMH · Put	SMH	Put	510	$33.5m510 shares	Reduced
ISHARES TR IGV · Put	IGV	Put	2,720	$24.6m2.7k shares	New
BRITISH AMERN TOB PLC BTI · Call	BTI	Call	3,300	$20.4m3.3k shares	New
ISHARES BITCOIN TRUST ETF IBIT · Put	IBIT	Put	6,000	$20.0m6.0k shares	New
ROUNDHILL ETF TRUST DRAM · Put	DRAM	Put	2,100	$15.5m2.1k shares	New
STUBHUB HLDGS INC STUB · Call	STUB	Call	9,000	$11.6m9.0k shares	New
ALKERMES PLC ALKS · Call	ALKS	Call	1,600	$8.4m1.6k shares	New
ECHOSTAR CORP ECHO · Call	ECHO	Call	709	$7.2m709 shares	Reduced
ENPHASE ENERGY INC ENPH · Call	ENPH	Call	1,200	$5.9m1.2k shares	New
COREWEAVE INC CRWV · Call	CRWV	Call	350	$3.5m350 shares	New
TEVA PHARMACEUTICAL INDS LTD Call		Call	1,000	$3.4m1.0k shares	New
CLEVELAND-CLIFFS INC NEW CLF · Call	CLF	Call	1,500	$1.4m1.5k shares	New
KEEL INFRASTRUCTURE CORP KEEL · Call	KEEL	Call	1,500	$861.0k1.5k shares	New

Stakes above 5%

Companies where this manager has reported owning more than 5% of a class of shares, on Schedule 13D (may seek influence) or 13G (passive): its latest filing for each, from 19 Dec 2024 on.

Company	Ticker	Stake	Change	Schedule	Last filed
JATT II ACQUISITION CORP JATT · 13G · filed 2026-08-14	JATT	5.1%≈ $4.5m	new	13G	2026-08-14