Atika Capital Management LLC Buys CarMax Inc, The Walt Disney Co, Heico Corp, Sells The Madison Square Garden Co, Zendesk Inc, Vertex Pharmaceuticals Inc

• New Purchases: KMX, DIS, HEI.A, SAGE, SHAK, PLAN, NBIX, ENPH, VAC, TW, MRTX, IOVA, TWLO, ADVM, VCYT, BCO, TWTR, ARQL, PTCT, MDCO, RARE, RCKT,
• Added Positions: MLM, AMZN, ZLAB, ARNA, BHVN, TNDM, INSP, VMC, ROKU, NFLX, CHRS, BATRK, TEAM, OKTA, GRA, SRPT, EHTH,
• Reduced Positions: ASH, VAR, NYT, ANET, DXCM, ISRG, SQ, EXAS, ZGNX, MOH, MDB, ARGX, NVCR, GOOS, EPAM, GH, ASND, RNG, MSFT, GWPH,
• Sold Out: MSG, ZEN, VRTX, BA, NVTA, HZNP, PEN, FTCH, TDOC, AERI, BMRN, VNDA, SPOT, FOLD, UNH, NTNX,

For the details of Atika Capital Management LLC's stock buys and sells, go to https://www.gurufocus.com/guru/atika+capital+management+llc/current-portfolio/portfolioportfolio

1. SPDR S&P Biotech ETF (XBI) - 245,000 shares, 4.48% of the total portfolio.
2. PowerShares QQQ Trust Ser 1 (QQQ) - 110,000 shares, 4.28% of the total portfolio.
3. Okta Inc (OKTA) - 150,000 shares, 3.86% of the total portfolio. Shares added by 2.04%
4. Exact Sciences Corp (EXAS) - 135,300 shares, 3.33% of the total portfolio. Shares reduced by 14.37%
5. Sarepta Therapeutics Inc (SRPT) - 92,000 shares, 2.91% of the total portfolio. Shares added by 2.22%

Atika Capital Management LLC initiated holding in CarMax Inc. The purchase prices were between $69.07 and $86.86, with an estimated average price of $78.16. The stock is now traded at around $83.78. The impact to a portfolio due to this purchase was 2.72%. The holding were 150,000 shares as of .

Atika Capital Management LLC initiated holding in The Walt Disney Co. The purchase prices were between $111.96 and $142.02, with an estimated average price of $132.62. The stock is now traded at around $135.74. The impact to a portfolio due to this purchase was 1.78%. The holding were 61,000 shares as of .

Atika Capital Management LLC initiated holding in Heico Corp. The purchase prices were between $84.34 and $103.81, with an estimated average price of $91.94. The stock is now traded at around $109.47. The impact to a portfolio due to this purchase was 1.66%. The holding were 77,000 shares as of .

Atika Capital Management LLC initiated holding in Sage Therapeutics Inc. The purchase prices were between $157.85 and $183.09, with an estimated average price of $170.61. The stock is now traded at around $165.04. The impact to a portfolio due to this purchase was 1.47%. The holding were 38,500 shares as of .

Atika Capital Management LLC initiated holding in Shake Shack Inc. The purchase prices were between $57.24 and $72.2, with an estimated average price of $61.65. The stock is now traded at around $89.99. The impact to a portfolio due to this purchase was 1.44%. The holding were 96,000 shares as of .

Atika Capital Management LLC initiated holding in Anaplan Inc. The purchase prices were between $35.07 and $51.35, with an estimated average price of $41.18. The stock is now traded at around $56.07. The impact to a portfolio due to this purchase was 1.18%. The holding were 112,000 shares as of .

Atika Capital Management LLC added to a holding in Martin Marietta Materials Inc by 53.85%. The purchase prices were between $202.66 and $230.63, with an estimated average price of $216.5. The stock is now traded at around $248.55. The impact to a portfolio due to this purchase was 0.67%. The holding were 40,000 shares as of .

Atika Capital Management LLC added to a holding in Amazon.com Inc by 24.65%. The purchase prices were between $1692.69 and $1962.46, with an estimated average price of $1862.37. The stock is now traded at around $1784.92. The impact to a portfolio due to this purchase was 0.52%. The holding were 6,600 shares as of .

Atika Capital Management LLC added to a holding in Zai Lab Ltd by 40.00%. The purchase prices were between $25.73 and $35.79, with an estimated average price of $29.41. The stock is now traded at around $30.47. The impact to a portfolio due to this purchase was 0.51%. The holding were 245,000 shares as of .

Atika Capital Management LLC added to a holding in Biohaven Pharmaceutical Holding Co Ltd by 59.00%. The purchase prices were between $39.79 and $67.01, with an estimated average price of $56.51. The stock is now traded at around $37.69. The impact to a portfolio due to this purchase was 0.38%. The holding were 112,893 shares as of .

Atika Capital Management LLC added to a holding in Tandem Diabetes Care Inc by 30.00%. The purchase prices were between $54.41 and $71.7, with an estimated average price of $64.4. The stock is now traded at around $61.91. The impact to a portfolio due to this purchase was 0.36%. The holding were 117,000 shares as of .

Atika Capital Management LLC added to a holding in Vulcan Materials Co by 30.77%. The purchase prices were between $119.2 and $137.31, with an estimated average price of $127.54. The stock is now traded at around $139.37. The impact to a portfolio due to this purchase was 0.29%. The holding were 42,500 shares as of .

Atika Capital Management LLC sold out a holding in The Madison Square Garden Co. The sale prices were between $272.47 and $312.44, with an estimated average price of $298.68.

Atika Capital Management LLC sold out a holding in Zendesk Inc. The sale prices were between $78.42 and $92.66, with an estimated average price of $85.9.

Atika Capital Management LLC sold out a holding in Vertex Pharmaceuticals Inc. The sale prices were between $164.61 and $190.37, with an estimated average price of $174.67.

Atika Capital Management LLC sold out a holding in Boeing Co. The sale prices were between $337.37 and $395.86, with an estimated average price of $364.73.

Atika Capital Management LLC sold out a holding in Invitae Corp. The sale prices were between $17.37 and $26.27, with an estimated average price of $21.25.

Atika Capital Management LLC sold out a holding in Horizon Therapeutics PLC. The sale prices were between $22.81 and $28.48, with an estimated average price of $25.35.