Ghost Tree Capital, LLC Buys Immunomedics Inc, Mersana Therapeutics Inc, Verastem Inc, Sells Aerie Pharmaceuticals Inc, Amicus Therapeutics Inc, Blueprint Medicines Corp

• New Purchases: VSTM, ZGNX, XENE, TRIL, FIXX, AVDL, SNDX, FXE, SAGE, CUE, AGTC, BIIB,
• Added Positions: IMMU, MRSN, CNST, SELB, TGTX, ADVM, MYOV, AXSM, ISEE, PHAS,
• Reduced Positions: IOVA, ASND, ARVN, RETA, CHRS, MRTX, AUPH, BCRX, KNSA, VRAY, KALV, RCKT, FATE, ORTX, KDMN, MIST, PTGX,
• Sold Out: AERI, FOLD, BPMC, SRPT, DBVT, ARQL, APLS, FXF, INSM, GBT, BHVN, CHMA, FXB, KPTI, ANAB, SPPI,

For the details of Ghost Tree Capital, LLC's stock buys and sells, go to https://www.gurufocus.com/guru/ghost+tree+capital%2C+llc/current-portfolio/portfolio

1. SPDR Series Trust S&P Biotech (XBI) - 737,500 shares, 15.71% of the total portfolio.
2. SPDR S&P 500 (SPY) - 146,700 shares, 10.40% of the total portfolio.
3. PowerShares QQQ Trust Ser 1 (QQQ) - 174,200 shares, 9.12% of the total portfolio.
4. SPDR Select Sector Fund - Health Care (XLV) - 244,700 shares, 5.96% of the total portfolio.
5. Constellation Pharmaceuticals Inc (CNST) - 650,000 shares, 5.62% of the total portfolio. Shares added by 12.95%

Ghost Tree Capital, LLC initiated holding in Verastem Inc. The purchase prices were between $1.26 and $3.38, with an estimated average price of $2.07. The stock is now traded at around $1.75. The impact to a portfolio due to this purchase was 1.09%. The holding were 1,500,000 shares as of .

Ghost Tree Capital, LLC initiated holding in Zogenix Inc. The purchase prices were between $17.8 and $56.59, with an estimated average price of $36.87. The stock is now traded at around $26.30. The impact to a portfolio due to this purchase was 1.02%. The holding were 150,000 shares as of .

Ghost Tree Capital, LLC initiated holding in Xenon Pharmaceuticals Inc. The purchase prices were between $8.08 and $17.57, with an estimated average price of $14.31. The stock is now traded at around $12.72. The impact to a portfolio due to this purchase was 1.01%. The holding were 325,000 shares as of .

Ghost Tree Capital, LLC initiated holding in Trillium Therapeutics Inc. The purchase prices were between $1.03 and $7.22, with an estimated average price of $3.72. The stock is now traded at around $5.89. The impact to a portfolio due to this purchase was 0.92%. The holding were 825,000 shares as of .

Ghost Tree Capital, LLC initiated holding in Homology Medicines Inc. The purchase prices were between $12.5 and $22.04, with an estimated average price of $17.1. The stock is now traded at around $12.85. The impact to a portfolio due to this purchase was 0.85%. The holding were 200,000 shares as of .

Ghost Tree Capital, LLC initiated holding in Avadel Pharmaceuticals PLC. The purchase prices were between $4.06 and $10.64, with an estimated average price of $7.67. The stock is now traded at around $7.70. The impact to a portfolio due to this purchase was 0.76%. The holding were 350,000 shares as of .

Ghost Tree Capital, LLC added to a holding in Immunomedics Inc by 110.00%. The purchase prices were between $9.48 and $21.16, with an estimated average price of $16.95. The stock is now traded at around $32.67. The impact to a portfolio due to this purchase was 2.04%. The holding were 1,050,000 shares as of .

Ghost Tree Capital, LLC added to a holding in Mersana Therapeutics Inc by 150.00%. The purchase prices were between $4.41 and $9.28, with an estimated average price of $7. The stock is now traded at around $9.91. The impact to a portfolio due to this purchase was 1.93%. The holding were 2,000,000 shares as of .

Ghost Tree Capital, LLC added to a holding in Selecta Biosciences Inc by 50.00%. The purchase prices were between $1.5 and $4.52, with an estimated average price of $3.22. The stock is now traded at around $3.32. The impact to a portfolio due to this purchase was 0.38%. The holding were 1,725,000 shares as of .

Ghost Tree Capital, LLC added to a holding in TG Therapeutics Inc by 217.46%. The purchase prices were between $7.14 and $15.99, with an estimated average price of $12.67. The stock is now traded at around $19.93. The impact to a portfolio due to this purchase was 0.37%. The holding were 200,000 shares as of .

Ghost Tree Capital, LLC added to a holding in Myovant Sciences Ltd by 30.00%. The purchase prices were between $6.55 and $15.52, with an estimated average price of $11.33. The stock is now traded at around $12.04. The impact to a portfolio due to this purchase was 0.28%. The holding were 585,000 shares as of .

Ghost Tree Capital, LLC sold out a holding in Aerie Pharmaceuticals Inc. The sale prices were between $11.84 and $25.52, with an estimated average price of $19.12.

Ghost Tree Capital, LLC sold out a holding in Amicus Therapeutics Inc. The sale prices were between $6.63 and $11.16, with an estimated average price of $9.55.

Ghost Tree Capital, LLC sold out a holding in Blueprint Medicines Corp. The sale prices were between $48.11 and $82.22, with an estimated average price of $64.89.

Ghost Tree Capital, LLC sold out a holding in Sarepta Therapeutics Inc. The sale prices were between $82.38 and $131.64, with an estimated average price of $114.91.

Ghost Tree Capital, LLC sold out a holding in DBV Technologies SA. The sale prices were between $2.33 and $12.98, with an estimated average price of $9.06.

Ghost Tree Capital, LLC sold out a holding in Arqule Inc. The sale prices were between $19.96 and $20.04, with an estimated average price of $20.