Atika Capital Management LLC

CIK 1599731 · View on SEC EDGAR ↗

Portfolio value
$884.0M
#2,648 of 9,443 by 13F value · top 28.0%
Positions
81
As of
June 30, 2026

Portfolio value QoQ: +91.7% 13F does not disclose cash

Top 10 holdings weight
50.21%
Top 25 holdings weight
72.70%
Positions above 1%
28
Effective number of positions
23.9

Based on 13F long-equity holdings only (cash, bonds, shorts not disclosed)

Turnover Q2 2026: 20.23% Est. buys $462,117,161 · sells $136,047,335

Median holding: 1.0 quarters Tracked Q4 2024–Q2 2026 · 34.9% still held

New positions
45
Increased
14
Decreased
13
Closed
20

Put-notional exposure: 23.1% puts 13F reports option positions at underlying notional value — may include hedges, not necessarily bearish bets

On this page

Performance vs S&P 500

Tracked Q4 2024–Q2 2026
+64.9%
S&P 500 total return (same window)
+28.1%
Excess return
+36.8%

Annualized: +39.7% · S&P 500: +18.0%

Approximates a buy-and-hold portfolio built from quarterly SEC 13F snapshots. Excludes cash, short positions, options/derivatives, and non-13(f) securities — reflects the disclosed long-equity book only, not total fund AUM. SEC filing lag is up to 45 days; this is not a real-time-copyable timing.

Priceable coverage: 98.8% · Options excluded: 13.0%

Sector breakdown

Industrials
24.6%
Technology
19.0%
Healthcare
18.2%
Retail
6.9%
Communication Services
4.9%
Consumer Discretionary
2.3%
Communications
2.2%
Consumer Staples
1.3%
Consumer products
0.9%
Materials
0.1%
Other/Unmapped
19.7%

Full portfolio 81 positions

Type Streak 8Q trend
VRT Vertiv Holdings, LLC Class A Common Stock $129,260,274 14.62% 386,059 $32,521,610
XBI XBI $51,890,175 5.87% 3,279 Put option $21,094,472 Up ×1
STX Seagate Technology Holdings PLC - Ordinary Shares (Ireland) $43,827,405 4.96% 45,417 $32,052,275 Up ×2
QQQ Invesco QQQ Trust, Series 1 $42,858,480 4.85% 582 Put option Up ×1
GEV GE Vernova Inc. Common Stock $34,305,912 3.88% 292 Put option Up ×1
AMD Advanced Micro Devices, Inc. - Common Stock $32,341,583 3.66% 55,674 Up ×1
AMZN Amazon.com, Inc. - Common Stock $30,817,362 3.49% 1,293 Call option
LLY Eli Lilly and Company Common Stock $28,703,559 3.25% 23,931 $6,692,543
QQQ Invesco QQQ Trust, Series 1 $28,351,400 3.21% 385 Call option Up ×1
INTC Intel Corporation - Common Stock $21,478,445 2.43% 153,824 Up ×1
MU Micron Technology, Inc. - Common Stock $20,196,925 2.28% 175 Put option Up ×1
SATS EchoStar Corporation - Common stock $19,705,921 2.23% 194,147 $7,286,784 Up ×4
SMH SMH $19,479,933 2.20% 297 Put option $3,377,133 Down ×1
GH Guardant Health, Inc. - Common Stock $15,547,759 1.76% 103,631 $10,825,250 Up ×1
IGV $14,378,220 1.63% 1,587 Put option Up ×1
CIEN Ciena Corporation Common Stock $13,534,550 1.53% 27,590 $3,966,233 Up ×1
ISRG Intuitive Surgical, Inc. - Common Stock $13,113,896 1.48% 32,976 $-2,087,710
BTI British American Tobacco Industries, p.l.c. Common Stock ADR $11,882,624 1.34% 1,924 Call option Up ×1
IBIT iShares Bitcoin Trust ETF $11,651,500 1.32% 3,500 Put option
VPG Vishay Precision Group, Inc. Common Stock $10,319,804 1.17% 68,840 Up ×1
MRVL Marvell Technology, Inc. - Common Stock $10,071,661 1.14% 33,810
RKLB Rocket Lab Corporation - Common Stock $10,005,613 1.13% 98,432 $6,786,457 Up ×2
WDC Western Digital Corporation - Common Stock $9,849,701 1.11% 15,421 $3,893,511 Down ×1
RVMD Revolution Medicines, Inc. - Common Stock $9,607,089 1.09% 51,298 Up ×1
Unknown issuer (CUSIP: K08588103) $9,492,031 1.07% 35,588 Up ×1
DNTH Dianthus Therapeutics, Inc. - Common Stock $9,417,738 1.07% 96,612 $3,107,206 Up ×1
Unknown issuer (CUSIP: 77926X320) $9,046,625 1.02% 1,225 Put option Up ×1
AXSM Axsome Therapeutics, Inc. - Common Stock $8,996,277 1.02% 36,754
TEVA Teva Pharmaceutical Industries Limited American Depositary Shares $8,696,488 0.98% 256,685 $322,224 Down ×2
MTZ MasTec, Inc. Common Stock $8,609,946 0.97% 20,694 $-2,216,605 Down ×1
SN SharkNinja, Inc. Ordinary Shares $7,804,447 0.88% 51,254
NFLX Netflix, Inc. - Common Stock $7,461,300 0.84% 104,500 $-2,586,375
CW Curtiss-Wright Corporation Common Stock $7,074,447 0.80% 9,336 $1,913,601 Up ×3
KYMR Kymera Therapeutics, Inc. - Common Stock $6,957,488 0.79% 60,674
STUB StubHub Holdings, Inc. Class A Common Stock $6,752,889 0.76% 5,247 Call option Up ×1
SITM SiTime Corporation - Common Stock $6,524,396 0.74% 8,751 $3,539,191 Up ×1
TWST Twist Bioscience Corporation - Common Stock $6,471,461 0.73% 62,903 Up ×1
REAL The RealReal, Inc. - Common Stock $6,469,928 0.73% 548,764 $4,078,801 Up ×1
BWXT BWX Technologies, Inc. Common Stock $6,132,838 0.69% 31,507 $-3,722,558 Down ×3
COGT Cogent Biosciences, Inc. - Common Stock $6,130,970 0.69% 158,423 $-457,710 Down ×2
AMZN Amazon.com, Inc. - Common Stock $6,118,664 0.69% 25,672 $805,071 Up ×1
TBBB BBB Foods Inc. Class A Common Shares $6,077,486 0.69% 145,848 $4,111,232 Up ×1
AXGN Axogen, Inc. - Common Stock $5,955,231 0.67% 128,929 Up ×1
NOK Nokia Corporation Sponsored American Depositary Shares $5,805,989 0.66% 437,198 Up ×1
ORKA Oruka Therapeutics, Inc. - Common Stock $5,547,745 0.63% 58,293 $-1,035,893 Down ×1
TTMI TTM Technologies, Inc. - Common Stock $5,451,072 0.62% 29,147 $170,226 Down ×2
CRL Charles River Laboratories International, Inc. Common Stock $5,023,625 0.57% 22,151 Up ×1
ALKS Alkermes plc - Ordinary Shares $4,888,920 0.55% 933 Call option Up ×1
ACMR ACM Research, Inc. - Class A Common Stock $4,660,035 0.53% 36,725 Up ×1
ROIV Roivant Sciences Ltd. - Common Shares $4,472,447 0.51% 126,376 Up ×1
MELI MercadoLibre, Inc. - Common Stock $4,469,228 0.51% 2,633 $-83,282
PTGX Protagonist Therapeutics, Inc. - Common Stock $4,444,260 0.50% 36,256 $622,878
RDDT Reddit, Inc. Class A Common Stock $4,350,956 0.49% 25,066
SMTC Semtech Corporation - Common Stock $4,343,568 0.49% 26,837 Up ×1
APPF AppFolio, Inc. - Class A Common Stock $4,307,322 0.49% 26,862 $67,961
SATS EchoStar Corporation - Common stock $4,263,000 0.48% 420 Call option $-6,718,166 Down ×2
FIVE Five Below, Inc. - Common Stock $4,187,848 0.47% 23,293 $-1,078,616 Up ×1
FERG Ferguson Enterprises Inc. Common Stock $3,753,849 0.42% 15,817 $64,376
ENPH Enphase Energy, Inc. - Common Stock $3,446,800 0.39% 700 Call option Up ×1
DFTX Definium Therapeutics, Inc. - Common Shares $3,348,119 0.38% 71,176 Up ×1
IMNM Immunome, Inc. - Common Stock $3,247,092 0.37% 153,237 $-104,201
HUT Hut 8 Corp. - Common Stock $2,997,183 0.34% 25,962 $1,646,972 Down ×1
WRBY Warby Parker Inc. Class A Common Stock $2,652,930 0.30% 87,440 $992,256 Up ×1
Unknown issuer (CUSIP: G50765109) $2,647,289 0.30% 233,036 Up ×1
PRAX Praxis Precision Medicines, Inc. - Common Stock $2,517,621 0.28% 7,520 Up ×1
LASR nLIGHT, Inc. - Common Stock $2,230,207 0.25% 32,034 $36,648 Down ×1
ABVX Abivax SA - American Depositary Shares $2,097,379 0.24% 15,739 $225,140 Down ×3
CRWV CoreWeave, Inc. - Class A Common Stock $2,030,616 0.23% 204 Call option Up ×1
TEVA Teva Pharmaceutical Industries Limited American Depositary Shares $1,975,204 0.22% 583 Call option
ALKS Alkermes plc - Ordinary Shares $1,695,869 0.19% 32,367 Up ×1
CRWD CrowdStrike Holdings, Inc. - Class A Common Stock $1,690,355 0.19% 2,215 Up ×1
TARS Tarsus Pharmaceuticals, Inc. - Common Stock $1,468,642 0.17% 23,334
KRYS Krystal Biotech, Inc. - Common Stock $1,300,845 0.15% 3,500 $-301,514 Down ×1
VCEL Vericel Corporation - Common Stock $881,035 0.10% 19,803 Up ×1
MANE Veradermics, Incorporated Common Stock $859,228 0.10% 6,989 Up ×1
KNSA Kiniksa Pharmaceuticals International, plc - Class A Ordinary Shares $858,081 0.10% 13,418
CLF Cleveland-Cliffs Inc. Common Stock $820,686 0.09% 874 Call option Up ×1
SG Sweetgreen, Inc. Class A Common Stock $616,815 0.07% 70,013
Unknown issuer (CUSIP: 486917107) $502,250 0.06% 875 Call option Up ×1
SNDK Sandisk Corporation - Common Stock $402,450 0.05% 177 Up ×1
STUB StubHub Holdings, Inc. Class A Common Stock $374,800 0.04% 29,122 Up ×1

Conviction holdings

Positions increased for 3+ consecutive quarters.

Share counts are as reported in 13F filings (not split-adjusted)

Security Value % of portfolio Streak
SATS $19,705,921 2.23% up ×4
CW $7,074,447 0.80% up ×3

Biggest new bets

New positions opened this quarter, largest first.

Security Value Shares % of portfolio
QQQ $42,858,480 582 4.85%
GEV $34,305,912 292 3.88%
AMD $32,341,583 55,674 3.66%
AMZN $30,817,362 1,293 3.49%
QQQ $28,351,400 385 3.21%
INTC $21,478,445 153,824 2.43%
MU $20,196,925 175 2.28%
IGV $14,378,220 1,587 1.63%
BTI $11,882,624 1,924 1.34%
IBIT $11,651,500 3,500 1.32%
VPG $10,319,804 68,840 1.17%
MRVL $10,071,661 33,810 1.14%
RVMD $9,607,089 51,298 1.09%
Unknown issuer (CUSIP: K08588103) $9,492,031 35,588 1.07%
Unknown issuer (CUSIP: 77926X320) $9,046,625 1,225 1.02%

Top movers (QoQ)

Security Action Shares Δ Value Δ
VRT Price move only +0 +$32.5M
STX Bought more +15K +$32.1M
XBI Bought more +868 +$21.1M
GH Bought more +53K +$10.8M
SATS Bought more +88K +$7.3M
RKLB Bought more +48K +$6.8M
SATS Trimmed -518 -$6.7M
LLY Price move only +0 +$6.7M
TBBB Bought more +90K +$4.1M
REAL Bought more +285K +$4.1M

Exited positions

Includes corporate events (mergers, delistings) — not all exits are sells

Closed positions reflect 13F reporting changes; for index managers these are often mechanical (delisting, M&A, index rebalancing), not active decisions.

SecurityQuarter Shares before Value before Price since exit
MSFT Dec. 31, 2025 93,537 $48,447,489 -0.3%
SPOT Dec. 31, 2025 35,969 $25,106,362 -9.2%
MLM Dec. 31, 2025 39,759 $25,059,303 -14.8%
AAPL March 31, 2025 879 $22,011,918 38.7%
TLT March 31, 2025 2,344 $20,470,152
ANET Dec. 31, 2025 132,598 $19,320,855 43.8%
CEG Dec. 31, 2025 56,163 $18,481,558 -22.8%
IWM June 30, 2025 908 $18,113,692 No longer tracked
META Dec. 31, 2025 21,350 $15,679,013 -16.9%
VST Dec. 31, 2025 74,353 $14,567,240 -13.7%
GEV Dec. 31, 2025 23,660 $14,548,534 48.5%
IWM June 30, 2026 583 $14,458,400 No longer tracked
CYBR Dec. 31, 2025 26,362 $12,736,800 No longer tracked
GDX June 30, 2026 47,473 $12,015,446 No longer tracked
TERN June 30, 2026 175,269 $11,364,429 No longer tracked
SHOP March 31, 2026 69,968 $11,262,749 22.9%
NBIS Dec. 31, 2025 99,687 $11,191,859 172.8%
MDGL March 31, 2026 18,993 $11,060,384 -0.9%
RBLX Dec. 31, 2025 78,717 $10,903,879 -52.0%
VRNA Dec. 31, 2025 97,222 $10,374,560 No longer tracked
GKOS Dec. 31, 2025 125,260 $10,214,953 63.7%
NVDA Dec. 31, 2025 43,942 $8,198,698 16.3%
INSP Dec. 31, 2025 107,940 $8,009,148 -34.2%
NET June 30, 2026 37,949 $7,830,397 12.3%
ADBE Dec. 31, 2025 21,951 $7,743,215 -22.0%
HOOD March 31, 2026 29,446 $7,663,543 53.4%
TSLA March 31, 2026 16,928 $7,612,860 -6.2%
INSM March 31, 2026 43,584 $7,585,359 -23.3%
GOOG June 30, 2026 25,209 $7,231,454 -4.0%
LNTH June 30, 2025 27,186 $7,040,083 22.5%
UTHR March 31, 2025 18,755 $6,617,514 70.7%
FIVE March 31, 2025 586 $6,150,656 222.8%
DASH March 31, 2026 25,956 $5,878,515 46.2%
AXSM March 31, 2026 31,316 $5,719,554 23.4%
SLNO Sept. 30, 2025 67,250 $5,634,205 No longer tracked
UBER Sept. 30, 2025 592 $5,523,360 -20.2%
MDB March 31, 2026 12,598 $5,287,255 71.0%
KVUE Dec. 31, 2025 3,226 $5,235,798 9.8%
EW March 31, 2025 703 $5,204,309 23.3%
GLNG March 31, 2025 120,148 $5,084,663 40.2%
REAL March 31, 2025 451,288 $4,932,578 109.9%
EYE Dec. 31, 2025 166,272 $4,853,480 -29.2%
TSLA June 30, 2025 181 $4,690,796 9.8%
ASML Dec. 31, 2025 4,828 $4,673,939 64.0%
TSM March 31, 2025 23,432 $4,627,586 153.1%
BSX March 31, 2025 51,574 $4,606,590 -51.0%
LMND March 31, 2026 64,279 $4,575,379 -18.0%
CSL March 31, 2026 14,283 $4,568,560 8.2%
NTRA Dec. 31, 2025 27,538 $4,432,792 41.9%
FRPT March 31, 2025 29,875 $4,424,786 -11.4%
TARS June 30, 2025 85,592 $4,396,861 78.4%
INSM June 30, 2025 56,908 $4,341,511 24.6%
MTZ March 31, 2025 31,471 $4,284,462 134.6%
UTHR June 30, 2026 7,210 $4,275,386 -2.9%
TOST March 31, 2025 116,564 $4,248,758 7.4%
KRMN June 30, 2026 52,750 $4,222,638 10.9%
DUOL Dec. 31, 2025 13,098 $4,215,460 -17.4%
EMBJ March 31, 2026 65,415 $4,210,764 28.2%
SG March 31, 2025 131,330 $4,210,440 -73.5%
IBIT March 31, 2026 847 $4,205,355
DHI Dec. 31, 2025 24,305 $4,118,968 3.0%
TW Sept. 30, 2025 27,905 $4,085,292 -4.1%
EMBJ June 30, 2025 88,374 $4,082,879 33.7%
MRVL March 31, 2025 36,924 $4,078,256 300.1%
TEVA June 30, 2025 258,958 $3,980,184 121.8%
NBIX March 31, 2025 29,050 $3,965,325 39.3%
GTLB March 31, 2025 70,331 $3,963,152 -13.0%
CRM March 31, 2025 11,721 $3,918,682 -23.4%
WWD Sept. 30, 2025 15,961 $3,911,881 36.4%
BECN March 31, 2025 37,783 $3,837,997 No longer tracked
LNG March 31, 2025 17,560 $3,773,117 20.8%
ROKU March 31, 2026 34,420 $3,734,226 66.5%
MDT Sept. 30, 2025 426 $3,713,442 -3.3%
ITCI March 31, 2025 44,202 $3,691,751 No longer tracked
MASI March 31, 2025 22,271 $3,681,396 No longer tracked
CLH June 30, 2026 12,760 $3,658,675 6.5%
TTD March 31, 2025 31,062 $3,650,717 -75.8%
MLYS Dec. 31, 2025 96,117 $3,644,757 -28.4%
RH March 31, 2026 19,760 $3,540,004 11.7%
PGNY March 31, 2025 201,031 $3,467,785 16.2%
TLN June 30, 2026 10,795 $3,446,088 -17.9%
META June 30, 2026 5,829 $3,334,946 -2.6%
SN March 31, 2026 29,696 $3,322,982 70.5%
KYMR March 31, 2025 82,598 $3,322,918 349.6%
DBVT June 30, 2026 158,133 $3,303,398 -11.5%
GTLS March 31, 2025 16,704 $3,187,791 No longer tracked
HEI June 30, 2026 11,229 $3,078,992 -0.7%
CALX Dec. 31, 2025 49,440 $3,034,133 -24.2%
SHW June 30, 2025 8,642 $3,017,700 1.3%
AFRM March 31, 2025 49,228 $2,997,985 66.8%
QXO June 30, 2026 154,279 $2,996,098 -20.9%
QURE Dec. 31, 2025 49,716 $2,901,923 106.6%
OSCR March 31, 2025 195,254 $2,890,326 135.1%
CAVA March 31, 2025 25,492 $2,875,498 -15.9%
GNRC Dec. 31, 2025 17,124 $2,866,558 54.7%
MDLN March 31, 2026 66,504 $2,793,168 -25.9%
FND March 31, 2026 457 $2,782,673 7.8%
CHKP June 30, 2025 11,854 $2,701,764 -41.4%
FSLR March 31, 2025 15,198 $2,678,496 70.0%
TKO Sept. 30, 2025 14,622 $2,660,473 -4.3%
RIVN March 31, 2026 1,336 $2,633,256 8.5%
HEIA March 31, 2025 14,066 $2,617,401 No longer tracked
GAP June 30, 2025 126,664 $2,610,545 -8.0%
SPNT Dec. 31, 2025 143,865 $2,602,518 7.9%
GE June 30, 2026 9,055 $2,569,537 -6.7%
FIGR March 31, 2026 62,885 $2,568,223 14.1%
ASND June 30, 2026 11,166 $2,553,999 -3.3%
BBWI March 31, 2026 126,959 $2,549,337 4.2%
KYMR Dec. 31, 2025 44,910 $2,541,906 58.2%
EEM March 31, 2026 461 $2,522,131 No longer tracked
NVO March 31, 2025 293 $2,520,386 -32.7%
EOSE March 31, 2026 2,054 $2,353,884 -27.9%
KMLM Dec. 31, 2025 558 $2,344,158 No longer tracked
ALNY March 31, 2026 5,834 $2,319,890 -30.6%
KNSA March 31, 2026 53,023 $2,187,199 62.0%
IONS March 31, 2026 26,796 $2,119,832 -20.3%
MU June 30, 2025 242 $2,102,738 698.9%
ARM March 31, 2025 16,996 $2,096,627 134.8%
AVGO Dec. 31, 2025 6,353 $2,095,918 7.7%
ANF March 31, 2026 16,364 $2,059,737 18.0%
AI Dec. 31, 2025 1,174 $2,035,716 -22.9%
XENE June 30, 2026 34,972 $2,033,622 -0.3%
ALAB March 31, 2025 14,651 $1,940,525 385.5%
MAZE June 30, 2026 64,990 $1,939,952 -2.6%
RXST Dec. 31, 2025 201,465 $1,811,170 -41.8%
RAPT March 31, 2026 53,179 $1,801,173 No longer tracked
DOCS June 30, 2025 302 $1,752,506 -58.4%
AAOI March 31, 2026 49,461 $1,724,210 54.9%
ACHC June 30, 2026 71,578 $1,674,209 -9.3%
BBIO June 30, 2026 20,551 $1,526,117 11.0%
WRBY March 31, 2025 62,500 $1,513,125 50.0%
NTSK Dec. 31, 2025 63,638 $1,446,492 -19.9%
RKT March 31, 2026 73,354 $1,420,133 -1.0%
HEIA June 30, 2026 6,174 $1,303,270 No longer tracked
HTFL Dec. 31, 2025 38,115 $1,282,951 63.4%
MPT March 31, 2025 3,233 $1,277,035 -32.1%
MRNA March 31, 2026 429 $1,265,121 181.7%
TSM Sept. 30, 2025 5,581 $1,264,041 50.5%
HNGE Sept. 30, 2025 24,389 $1,262,131 77.6%
U March 31, 2026 279 $1,232,343 110.1%
WBA Sept. 30, 2025 910 $1,044,680 No longer tracked
CECO March 31, 2026 16,817 $1,006,497 22.3%
INFY Dec. 31, 2025 558 $907,866 -33.5%
RARE Dec. 31, 2025 279 $839,232 13.6%
NOVT Sept. 30, 2025 5,916 $762,750 47.9%
VMC June 30, 2025 2,850 $664,905 4.8%
ZURA Dec. 31, 2025 152,462 $660,160 11.5%
LUMN March 31, 2025 1,140 $605,340 53.4%
CDTX March 31, 2026 27 $596,403 No longer tracked
WRBY Sept. 30, 2025 25,002 $548,294 -0.9%
XENE June 30, 2025 14,225 $477,249 92.3%
CLS June 30, 2025 60 $472,860 94.3%
ABVX March 31, 2025 62,678 $458,803 1811.2%
CAI Dec. 31, 2025 14,804 $447,821 -7.6%
SFM June 30, 2025 2,776 $423,729 -51.5%
IBM Dec. 31, 2025 1,496 $422,111 -21.1%
STAA Dec. 31, 2025 15,324 $411,756 0.5%
SAVA March 31, 2025 1,447 $341,492 No longer tracked
DRUG March 31, 2025 9,080 $327,062 117.4%
RDDT March 31, 2026 1,129 $259,523 13.9%