XLRN insider transactions

SEC Form 4: Zakrzewski Joseph S closing all direct ownership in the company to cover withholding tax

SEC Form 4: Malik Kemal closing all direct ownership in the company (withholding obligation)

SEC Form 4: Hite Christopher closing all direct ownership in the company to satisfy withholding tax

SEC Form 4: Smith Karen L. closing all direct ownership in the company to satisfy withholding tax

SEC Form 4: Mccourt Thomas A closing all direct ownership in the company (tax liability)

SEC Form 4: Kearney Terrence C closing all direct ownership in the company (for tax liability)

SEC Form 4: Hamill Laura closing all direct ownership in the company (tax liability)

SEC Form 4: Nader Francois closing all direct ownership in the company to cover withholding tax

SEC Form 4: Veness Adam M closing all direct ownership in the company (for tax liability)

SEC Form 4: Kango Sujay closing all direct ownership in the company (for tax liability)

SEC Form 4: Backstrom Jay T. closing all direct ownership in the company (withholding obligation)

SEC Form 4: Mclaughlin Kevin F closing all direct ownership in the company to cover taxes

SEC Form 4: Dable Habib J closing all direct ownership in the company to cover withholding tax

SEC Form 4: Veness Adam M exercised 4,500 shares at a strike of $29.37, increasing direct ownership by 24% to 23,423 units

SEC Form 4: Kango Sujay exercised 5,000 shares at a strike of $40.61 and sold $875,000 worth of shares (5,000 units at $175.00) as part of a pre-agreed trading plan

SEC Form 4: Mclaughlin Kevin F exercised 25,000 shares at a strike of $39.88 and sold $4,008,127 worth of shares (25,000 units at $160.33)

SEC Form 4: Veness Adam M sold $997,833 worth of Common Stock (6,650 units at $150.05) and exercised 6,650 units of Common Stock at a strike of $32.58

SEC Form 4: Kango Sujay sold $750,150 worth of Common Stock (5,000 units at $150.03) and exercised 5,000 units of Common Stock at a strike of $40.61

SEC Form 4: Veness Adam M sold $183,690 worth of Common Stock (1,413 units at $130.00) and covered exercise/tax liability with 587 units of Common Stock, decreasing direct ownership by 10% to 18,923 units

SEC Form 4: Dable Habib J exercised 100,000 units of Common Stock at a strike of $35.04 and sold $12,682,942 worth of Common Stock (100,000 units at $126.83)

SEC Form 4 filed by Acceleron Pharma Inc.

SEC Form 4: KANGO SUJAY covered exercise/tax liability with 887 units of Common Stock, decreasing direct ownership by 5% to 18,509 units

SEC Form 4: MCCOURT Thomas A exercised 7,500 units of Common Stock at a strike of $40.61 and sold $894,425 worth of Common Stock (7,500 units at $119.26)

SEC Form 4: S Joseph Zakrzewski exercised 10,000 units of Common Stock at a strike of $24.11 and sold $1,407,343 worth of Common Stock (10,000 units at $140.73)

SEC Form 4: L. Karen Smith exercised 8,925 units of Common Stock at a strike of $40.72 and sold $1,663,156 worth of Common Stock (11,864 units at $140.19), decreasing direct ownership by 64% to 1,622 units

SEC Form 4: S Joseph Zakrzewski sold $1,346,382 worth of Common Stock (10,000 units at $134.64) and exercised 10,000 units of Common Stock at a strike of $24.11

SEC Form 4: L. Karen Smith exercised 8,925 units of Common Stock at a strike of $40.72 and sold $1,218,003 worth of Common Stock (8,925 units at $136.47)

SEC Form 4: Sujay Kango exercised 5,000 units of Common Stock at a strike of $40.61 and sold $680,059 worth of Common Stock (5,000 units at $136.01)

SEC Form 4: M Adam Veness was granted 4,868 units of Common Stock, increasing ownership by 30% to 21,031 units

SEC Form 4: F Kevin Mclaughlin was granted 4,868 units of Common Stock, increasing ownership by 84% to 10,681 units

SEC Form 4: Sujay Kango was granted 5,409 units of Common Stock, increasing ownership by 39% to 19,396 units

SEC Form 4: Sujay Kango exercised 10,000 units of Common Stock at a strike of $40.61, increasing ownership by 251% to 13,987 units

SEC Form 4: T. Jay Backstrom was granted 5,409 units of Common Stock, increasing ownership by 35% to 20,781 units

SEC Form 4: J Habib Dable was granted 16,662 units of Common Stock, increasing ownership by 20% to 98,450 units

SEC Form 4: S Joseph Zakrzewski was granted 1,622 units of Common Stock, increasing ownership by 5% to 34,499 units

SEC Form 4: L. Karen Smith was granted 1,622 units of Common Stock, increasing ownership by 55% to 4,561 units

SEC Form 4: A Thomas Mccourt was granted 1,622 units of Common Stock, increasing ownership by 37% to 6,044 units

SEC Form 4: Kemal Malik was granted 1,622 units of Common Stock

SEC Form 4: C Terrence Kearney was granted 1,622 units of Common Stock, increasing ownership by 32% to 6,749 units

SEC Form 4: Christopher Hite was granted 930 units of Common Stock

SEC Form 4: Laura Hamill was granted 474 units of Common Stock

SEC Form 4: Francois Nader was granted 1,622 units of Common Stock, increasing ownership by 32% to 6,749 units