13G Filing: Billionaire David Shaw’s D. E. Shaw & Co. and AMAG Pharmaceuticals Inc. (AMAG)

Page 3 of 6 SEC Filing

CUSIP No. 00163U106

1.

Names of Reporting Persons

I.R.S. Identification Nos. of above persons (entities only)

David E. Shaw

2. Check the Appropriate Box if a Member of a Group (See Instructions)
(a) ¨
(b) ¨
3. SEC Use Only
4.

Citizenship or Place of Organization

United States

Number of

Shares

Beneficially

Owned by

Each

Reporting

Person With

5.

Sole Voting Power

-0-

6.

Shared Voting Power

1,729,526

7.

Sole Dispositive Power

-0-

8.

Shared Dispositive Power

1,735,509

9.

Aggregate Amount Beneficially Owned by Each Reporting Person

1,735,509

10.

Check if the Aggregate Amount in Row (9) Excludes Certain Shares
(See Instructions) o

11.

Percent of Class Represented by Amount in Row (9)

5.0%

12.

Type of Reporting Person (See Instructions)

IN

Follow Amag Pharmaceuticals Inc. (NASDAQ:AMAG)