Atika Capital Management LLC

CIK

1599731

Location

NEW YORK, NY

Portfolio Value

Mid $1,012,753,352

Diversification

Diversified

Reports for

Atika Capital Partners LP Optika Master Portfolio Ltd

Filing Date

Global Rank

#2,499 / 8,794 ▲ 418 · as of Jun 2026

Top Industry

Electrical Equipment & Parts 22.1%

Period ended 3 months ago

Filed Aug 13, 2026 · 52d

26 quarters · since Mar 2020

Clone Performance

Build a hypothetical price-return history from this filer's public 13F holdings.

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Portfolio Concentration

74 tracked positions · as of Jun 30, 2026 · Δ vs Mar 31, 2026

Top Position

22.0%

−4.9 pts

Top 5

43.6%

−0.6 pts

Top 10

56.0%

−1.8 pts

HHI

690

Diversified−206

Portfolio Trend

26 quarters · across all stocks

Sector Breakdown

As of Jun 30, 2026

Sector	% Portfolio	Value	Positions
Technology	30.3%	$306,627,937	20
Healthcare	28.8%	$291,579,666	27
Industrials	28.2%	$285,149,031	7
Communication Services	5.4%	$54,784,328	4
Consumer Cyclical	5.1%	$51,402,451	6
Consumer Defensive	1.0%	$10,621,306	2
Financial Services	1.0%	$9,681,300	2
Unclassified	0.3%	$2,893,250	5
Basic Materials	0.0%	$14,083	1

Last Quarter's Activity

Export CSV

Jun 30, 2026 vs Mar 31, 2026

Added To

Positions the filer increased

17 positions

Ticker	Company	Δ Shares	Shares	Value
REAL	TheRealReal, Inc.	+488,945	940,000	$11,082,598
INTC	Intel Corp	+263,000	264,000	$36,862,319
TBBB	Bbb Foods Inc	+154,782	250,000	$10,417,499
ECHO	EchoStar CORP	+148,526	332,109	$33,709,062
GH	Guardant Health, Inc.	+90,000	181,000	$27,155,428
RKLB	Rocket Lab Corp	+83,000	169,000	$17,178,848
ASND	Ascendis Pharma A/S	+41,875	61,000	$16,269,919
DNTH	Dianthus Therapeutics, Inc. /DE/	+36,200	165,000	$16,084,198
STX	Seagate Technology Holdings plc	+26,365	79,865	$77,069,725
WRBY	Warby Parker Inc.	+15,000	150,000	$4,550,999
CIEN	Ciena Corp	+5,117	48,768	$23,923,629
CW	Curtiss Wright Corp	+3,000	16,000	$12,124,158
AMZN	Amazon Com Inc	+2,520	46,220	$11,016,072
AAXJ	iShares MSCI All Country Asia ex Japan ETF	+1,720	2,720	$246,431
BWX	State Street SPDR Bloomberg International Treasury Bond ETF	+1,400	5,625	$890,155
FIVE	Five Below, Inc	+520	40,000	$7,191,598
SITM	SITIME Corp	+195	15,000	$11,183,398
No positions match the current search.

Trimmed

Positions the filer reduced

13 positions

Ticker	Company	Δ Shares	Shares	Value
ORKA	Oruka Therapeutics, Inc.	−129,900	100,000	$9,516,998
AFK	VanEck Africa Index ETF	−81,710	510	$334,503
TTMI	Ttm Technologies Inc	−43,000	50,000	$9,350,998
TEVA	Teva Pharmaceutical Industries Ltd	−36,000	441,000	$14,941,078
BWXT	BWX Technologies, Inc.	−28,550	54,000	$10,511,098
MTZ	Mastec Inc	−22,136	35,500	$14,770,129
COGT	Cogent Biosciences, Inc.	−21,200	272,000	$10,526,399
WDC	Western Digital Corp	−11,240	26,477	$16,911,388
LASR	Nlight, Inc.	−11,000	55,000	$3,829,099
HUT	Hut 8 Corp.	−4,800	44,500	$5,137,302
KRYS	Krystal Biotech, Inc.	−4,625	6,000	$2,230,019
ABVX	Abivax S.A.	−1,800	27,000	$3,598,019
NFLX	Netflix Inc	−1,650	180,000	$12,852,000
No positions match the current search.

New Positions

Positions the filer opened this quarter

25 positions

Ticker	Company	Shares	Value
AMD	Advanced Micro Devices Inc	95,500	$55,476,904
VPG	Vishay Precision Group, Inc.	118,000	$17,689,378
MRVL	Marvell Technology, Inc.	58,000	$17,277,619
RVMD	Revolution Medicines, Inc.	88,000	$16,480,639
AXSM	Axsome Therapeutics, Inc.	63,000	$15,420,508
SN	SharkNinja, Inc.	88,000	$13,399,758
KYMR	Kymera Therapeutics, Inc.	104,000	$11,925,678
TWST	Twist Bioscience Corp	108,000	$11,111,039
AXGN	Axogen, Inc.	221,000	$10,207,988
NOK	Nokia Corp	750,000	$9,959,999
CRL	Charles River Laboratories International, Inc.	38,000	$8,618,019
ACMR	ACM Research, Inc.	63,000	$7,994,069
ROIV	Roivant Sciences Ltd.	217,000	$7,679,628
RDDT	Reddit, Inc.	43,000	$7,463,939
SMTC	Semtech Corp	46,000	$7,445,099
DFTX	Definium Therapeutics, Inc.	122,000	$5,738,879
JATT	JATT II Acquisition Corp.	400,000	$4,543,998
PRAX	Praxis Precision Medicines, Inc.	12,900	$4,318,789
ALKS	Alkermes plc.	57,171	$2,995,758
CRWD	CrowdStrike Holdings, Inc.	3,800	$2,899,931
TARS	Tarsus Pharmaceuticals, Inc.	40,000	$2,517,598
VCEL	Vericel Corp	34,000	$1,512,658
MANE	Veradermics, Inc	12,000	$1,475,279
KNSA	Kiniksa Pharmaceuticals International, plc	23,000	$1,470,849
QQQ	Invesco Qqq Trust, Series 1	1,660	$1,222,422
No positions match the current search.

Sold Out

Positions the filer fully exited

16 positions

Ticker	Company	Shares	Value
NET	Cloudflare, Inc.	65,000	$13,412,099
GOOGL	Alphabet Inc.	43,250	$12,406,693
HEI	Heico Corp	29,840	$7,514,736
UTHR	UNITED THERAPEUTICS Corp	12,350	$7,323,301
KRMN	Karman Holdings Inc.	90,500	$7,244,523
CLH	Clean Harbors Inc	21,855	$6,266,482
TLN	Talen Energy Corp	18,490	$5,902,561
META	Meta Platforms, Inc.	10,000	$5,721,298
DBVT	DBV Technologies S.A.	271,300	$5,667,456
QXO	QXO, Inc.	264,253	$5,131,792
GE	General Electric Co	15,510	$4,401,271
XENE	Xenon Pharmaceuticals Inc.	59,900	$3,483,183
MAZE	Maze Therapeutics, Inc.	111,500	$3,328,273
ACHC	Acadia Healthcare Company, Inc.	122,600	$2,867,613
BBIO	BridgeBio Pharma, Inc.	35,200	$2,613,951
—		300,720	$0
No positions match the current search.

Portfolio Positions

Compact Export CSV View 13F filing

74 tracked positions · $1,012,753,352 total · filing declares 243 positions · $1,521,477,391 · as of Jun 30, 2026

All sectors Basic Materials Communication Services Consumer Cyclical Consumer Defensive Financial Services Healthcare Industrials Technology

Showing 1–50 of 74 positions by value · page 1 of 2

Ticker	Company	Type	Shares	Δ Shares	Value (USD)	% Δ Value	% of Portfolio
VRT	Vertiv Holdings Co Industrials	Held	666,100	0	$223,023,601	+33.6%	22.02%
STX	Seagate Technology Holdings plc Technology	Added	79,865	+26,365	$77,069,725	+267.7%	7.61%
AMD	Advanced Micro Devices Inc Technology	NEW	95,500	NEW	$55,476,904	NEW	5.48%
LLY	ELI LILLY & Co Healthcare	Held	41,100	0	$49,296,575	+30.4%	4.87%
INTC	Intel Corp Technology	Added	264,000	+263,000	$36,862,319	+83433.1%	3.64%
ECHO	EchoStar CORP CALL + SHARES Communication Services	Added	332,109	+148,526	$33,709,062	+56.8%	3.33%
GH	Guardant Health, Inc. Healthcare	Added	181,000	+90,000	$27,155,428	+223.1%	2.68%
CIEN	Ciena Corp Technology	Added	48,768	+5,117	$23,923,629	+41.2%	2.36%
ISRG	Intuitive Surgical Inc Healthcare	Held	57,216	0	$22,753,658	−13.7%	2.25%
VPG	Vishay Precision Group, Inc. Technology	NEW	118,000	NEW	$17,689,378	NEW	1.75%
MRVL	Marvell Technology, Inc. Technology	NEW	58,000	NEW	$17,277,619	NEW	1.71%
RKLB	Rocket Lab Corp Industrials	Added	169,000	+83,000	$17,178,848	+211.0%	1.70%
WDC	Western Digital Corp Technology	Reduced	26,477	-11,240	$16,911,388	+65.8%	1.67%
RVMD	Revolution Medicines, Inc. Healthcare	NEW	88,000	NEW	$16,480,639	NEW	1.63%
ASND	Ascendis Pharma A/S Healthcare	Added	61,000	+41,875	$16,269,919	+271.9%	1.61%
DNTH	Dianthus Therapeutics, Inc. /DE/ Healthcare	Added	165,000	+36,200	$16,084,198	+48.8%	1.59%
AXSM	Axsome Therapeutics, Inc. Healthcare	NEW	63,000	NEW	$15,420,508	NEW	1.52%
TEVA	Teva Pharmaceutical Industries Ltd CALL + SHARES Healthcare	Reduced	441,000	-36,000	$14,941,078	+4.0%	1.48%
MTZ	Mastec Inc Industrials	Reduced	35,500	-22,136	$14,770,129	−20.4%	1.46%
SN	SharkNinja, Inc. Consumer Cyclical	NEW	88,000	NEW	$13,399,758	NEW	1.32%
NFLX	Netflix Inc Communication Services	Reduced	180,000	-1,650	$12,852,000	−26.4%	1.27%
CW	Curtiss Wright Corp Industrials	Added	16,000	+3,000	$12,124,158	+36.9%	1.20%
KYMR	Kymera Therapeutics, Inc. Healthcare	NEW	104,000	NEW	$11,925,678	NEW	1.18%
SITM	SITIME Corp Technology	Added	15,000	+195	$11,183,398	+118.7%	1.10%
TWST	Twist Bioscience Corp Healthcare	NEW	108,000	NEW	$11,111,039	NEW	1.10%
REAL	TheRealReal, Inc. Consumer Cyclical	Added	940,000	+488,945	$11,082,598	+170.6%	1.09%
AMZN	Amazon Com Inc CALL + SHARES Consumer Cyclical	Added	46,220	+2,520	$11,016,072	+21.0%	1.09%
COGT	Cogent Biosciences, Inc. Healthcare	Reduced	272,000	-21,200	$10,526,399	−6.7%	1.04%
BWXT	BWX Technologies, Inc. Industrials	Reduced	54,000	-28,550	$10,511,098	−37.7%	1.04%
TBBB	Bbb Foods Inc Consumer Defensive	Added	250,000	+154,782	$10,417,499	+209.3%	1.03%
AXGN	Axogen, Inc. Healthcare	NEW	221,000	NEW	$10,207,988	NEW	1.01%
NOK	Nokia Corp Technology	NEW	750,000	NEW	$9,959,999	NEW	0.98%
ORKA	Oruka Therapeutics, Inc. Healthcare	Reduced	100,000	-129,900	$9,516,998	−15.6%	0.94%
TTMI	Ttm Technologies Inc Technology	Reduced	50,000	-43,000	$9,350,998	+3.2%	0.92%
CRL	Charles River Laboratories International, Inc. Healthcare	NEW	38,000	NEW	$8,618,019	NEW	0.85%
ACMR	ACM Research, Inc. Technology	NEW	63,000	NEW	$7,994,069	NEW	0.79%
ROIV	Roivant Sciences Ltd. Healthcare	NEW	217,000	NEW	$7,679,628	NEW	0.76%
MELI	Mercadolibre Inc Consumer Cyclical	Held	4,510	0	$7,655,227	−1.8%	0.76%
APPF	Appfolio Inc Technology	Held	47,500	0	$7,616,623	+1.6%	0.75%
PTGX	Protagonist Therapeutics, Inc Healthcare	Held	62,100	0	$7,612,217	+16.3%	0.75%
RDDT	Reddit, Inc. Communication Services	NEW	43,000	NEW	$7,463,939	NEW	0.74%
SMTC	Semtech Corp Technology	NEW	46,000	NEW	$7,445,099	NEW	0.74%
FIVE	Five Below, Inc Consumer Cyclical	Added	40,000	+520	$7,191,598	−20.3%	0.71%
FERG	Ferguson Enterprises Inc. /DE/ Industrials	Held	29,300	0	$6,953,768	+1.7%	0.69%
DFTX	Definium Therapeutics, Inc. Healthcare	NEW	122,000	NEW	$5,738,879	NEW	0.57%
IMNM	Immunome Inc. Healthcare	Held	262,900	0	$5,570,850	−3.1%	0.55%
HUT	Hut 8 Corp. Financial Services	Reduced	44,500	-4,800	$5,137,302	+122.1%	0.51%
WRBY	Warby Parker Inc. Healthcare	Added	150,000	+15,000	$4,550,999	+60.0%	0.45%
JATT	JATT II Acquisition Corp. Financial Services	NEW	400,000	NEW	$4,543,998	NEW	0.45%
PRAX	Praxis Precision Medicines, Inc. Healthcare	NEW	12,900	NEW	$4,318,789	NEW	0.43%

Covers the securities this platform tracks: U.S.-listed common stock and the put/call positions reported on it. A 13F can also report security types outside that coverage — preferred shares, bonds, warrants, untracked share classes — so the filing's own declared total can exceed the figures above. The source filing is linked at the top of this table.