EcoR1 Capital, LLC Buys CRISPR Therapeutics AG, Ultragenyx Pharmaceutical Inc, Xencor Inc, Sells FibroGen Inc, Ionis Pharmaceuticals Inc, Assembly Biosciences Inc

• New Purchases: RARE, GOSS, MRSN, ADRO, VCEL, SNNA,
• Added Positions: CRSP, XNCR, MRTX, CHMA, MYOK, RUBY,
• Reduced Positions: FGEN, ASMB, SRRK, ONCE, ASND, ZLAB, IRWD, KZR, ABUS, RCUS, PRTA, UBX, MGTA,
• Sold Out: IONS, SLDB, AKCA, SGMO, WVE, ARRY, IMDZ, PTLA, ACRS, FPRX, CORT, DVAX, CRVS, ONTX, AFMD, CNST, PRQR,

For the details of EcoR1 Capital, LLC's stock buys and sells, go to https://www.gurufocus.com/guru/ecor1+capital%2C+llc/current-portfolio/portfolio

1. argenx SE (ARGX) - 825,087 shares, 11.30% of the total portfolio.
2. Kura Oncology Inc (KURA) - 5,276,753 shares, 9.61% of the total portfolio.
3. Mirati Therapeutics Inc (MRTX) - 1,000,000 shares, 8.04% of the total portfolio. Shares added by 54.52%
4. CRISPR Therapeutics AG (CRSP) - 1,878,277 shares, 7.36% of the total portfolio. Shares added by 799.34%
5. Xencor Inc (XNCR) - 2,059,429 shares, 7.02% of the total portfolio. Shares added by 108.23%

EcoR1 Capital, LLC initiated holding in Ultragenyx Pharmaceutical Inc. The purchase prices were between $39.87 and $69.36, with an estimated average price of $56.86. The stock is now traded at around $64.05. The impact to a portfolio due to this purchase was 3.79%. The holding were 497,899 shares as of .

EcoR1 Capital, LLC initiated holding in Gossamer Bio Inc. The purchase prices were between $17.58 and $23.97, with an estimated average price of $20.81. The stock is now traded at around $20.53. The impact to a portfolio due to this purchase was 1.84%. The holding were 772,096 shares as of .

EcoR1 Capital, LLC initiated holding in Mersana Therapeutics Inc. The purchase prices were between $3.51 and $7.3, with an estimated average price of $5.02. The stock is now traded at around $5.69. The impact to a portfolio due to this purchase was 1.33%. The holding were 2,300,000 shares as of .

EcoR1 Capital, LLC initiated holding in Aduro Biotech Inc. The purchase prices were between $2.42 and $4.3, with an estimated average price of $3.47. The stock is now traded at around $3.39. The impact to a portfolio due to this purchase was 0.85%. The holding were 1,939,390 shares as of .

EcoR1 Capital, LLC initiated holding in Vericel Corp. The purchase prices were between $16.23 and $20.29, with an estimated average price of $18.29. The stock is now traded at around $17.53. The impact to a portfolio due to this purchase was 0.25%. The holding were 131,001 shares as of .

EcoR1 Capital, LLC initiated holding in Sienna Biopharmaceuticals Inc. The purchase prices were between $2.32 and $3.25, with an estimated average price of $2.71. The stock is now traded at around $1.33. The impact to a portfolio due to this purchase was 0.2%. The holding were 800,000 shares as of .

EcoR1 Capital, LLC added to a holding in CRISPR Therapeutics AG by 799.34%. The purchase prices were between $28.02 and $40.87, with an estimated average price of $34.47. The stock is now traded at around $39.30. The impact to a portfolio due to this purchase was 6.54%. The holding were 1,878,277 shares as of .

EcoR1 Capital, LLC added to a holding in Xencor Inc by 108.23%. The purchase prices were between $27.85 and $38.09, with an estimated average price of $33.37. The stock is now traded at around $34.95. The impact to a portfolio due to this purchase was 3.65%. The holding were 2,059,429 shares as of .

EcoR1 Capital, LLC added to a holding in Mirati Therapeutics Inc by 54.52%. The purchase prices were between $42.42 and $78.95, with an estimated average price of $67.65. The stock is now traded at around $70.22. The impact to a portfolio due to this purchase was 2.84%. The holding were 1,000,000 shares as of .

EcoR1 Capital, LLC added to a holding in Chiasma Inc by 701.53%. The purchase prices were between $2.98 and $6.93, with an estimated average price of $4.37. The stock is now traded at around $6.07. The impact to a portfolio due to this purchase was 1.52%. The holding were 3,043,827 shares as of .

EcoR1 Capital, LLC added to a holding in MyoKardia Inc by 104.19%. The purchase prices were between $39.23 and $55.82, with an estimated average price of $46.05. The stock is now traded at around $48.61. The impact to a portfolio due to this purchase was 1.39%. The holding were 478,574 shares as of .

EcoR1 Capital, LLC sold out a holding in Ionis Pharmaceuticals Inc. The sale prices were between $52.92 and $81.17, with an estimated average price of $64.16.

EcoR1 Capital, LLC sold out a holding in Solid Biosciences Inc. The sale prices were between $7.19 and $32.37, with an estimated average price of $16.87.

EcoR1 Capital, LLC sold out a holding in Akcea Therapeutics Inc. The sale prices were between $25.45 and $34.03, with an estimated average price of $29.13.

EcoR1 Capital, LLC sold out a holding in Sangamo Therapeutics Inc. The sale prices were between $7.72 and $12.81, with an estimated average price of $10.23.

EcoR1 Capital, LLC sold out a holding in WAVE Life Sciences Ltd. The sale prices were between $32.69 and $47.91, with an estimated average price of $40.58.

EcoR1 Capital, LLC sold out a holding in Array BioPharma Inc. The sale prices were between $14.25 and $24.45, with an estimated average price of $20.7.