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Filing Details

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
1182129	Auxilium Pharmaceuticals Inc	AUXL	Pharmaceutical Preparations (2834)	233016883

Insiders

Cik	Name	Reported Address	Director	Officer	Large Shareholder	Other
1087939	Julian Baker	667 Madison Avenue 17Th Floor New York NY 10021	No	No	Yes	No
1087940	Felix Baker	667 Madison Avenue 17Th Floor New York NY 10021	No	No	Yes	No
1307729	Baker Brothers Life Sciences Capital (Gp), Llc	667 Madison Avenue 17Th Floor New York NY 10021	No	No	Yes	No

Reported Non-Derivative Transactions

Sec. Name	Acquisiton - Disposition	Date	Amount	Price	Remaning Holdings	Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
Common Stock	Acquisiton	2011-03-08	10,996	$23.05	4,795,872	No	4	P	Indirect	Through Partnership
Common Stock	Acquisiton	2011-03-08	86,227	$22.88	4,882,099	No	4	P	Indirect	Through Partnership
Common Stock	Acquisiton	2011-03-08	48,657	$22.86	4,930,756	No	4	P	Indirect	Through Partnership
Common Stock	Acquisiton	2011-03-08	1,948	$22.51	4,932,704	No	4	P	Indirect	Through Partnership
Common Stock	Acquisiton	2011-03-08	58,388	$22.81	4,991,092	No	4	P	Indirect	Through Partnership
Common Stock	Acquisiton	2011-03-09	117,273	$23.17	5,108,365	No	4	P	Indirect	Through Partnership
Common Stock	Acquisiton	2011-03-09	115,000	$23.44	5,223,365	No	4	P	Indirect	Through Partnership
Common Stock	Acquisiton	2011-03-09	550,000	$22.75	5,773,365	No	4	P	Indirect	Through Partnership

Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
No	4	P	Indirect	Through Partnership
No	4	P	Indirect	Through Partnership
No	4	P	Indirect	Through Partnership
No	4	P	Indirect	Through Partnership
No	4	P	Indirect	Through Partnership
No	4	P	Indirect	Through Partnership
No	4	P	Indirect	Through Partnership
No	4	P	Indirect	Through Partnership

Footnotes

In addition to Baker Brothers Life Sciences Capital (GP), LLC, this Form 4 is being filed jointly by Julian C. Baker and Felix J. Baker each of whom has the same business address as Baker Brothers Life Sciences Capital (GP), LLC and may be deemed to have a pecuniary interest in securities owned by it. Because of certain relationships with other security holders of the Issuer, the Reporting Persons are filing solely for informational purposes as if they were a member of a group of such shareholders. (Continued in footnote 2).
However, the Reporting Persons disclaim that they and any other person or persons, in fact constitute a "group" for purposes of Section 13(d)(3) of the Securities Exchange Act of 1934, as amended, or Rule 13d-5 thereunder or that they are the beneficial owners of securities owned by any such other persons, and each of them disclaims beneficial ownership of securities reported herein except to the extent of their pecuniary interest, if any, therein.
Represents securities owned directly by Baker Brothers Life Sciences, L.P., the sole general partner of which is Baker Brothers Life Sciences Capital, L.P., a limited partnership the sole general partner of which is Baker Brothers Life Sciences Capital (GP),LLC. Julian C. Baker and Felix J. Baker are controlling members of Baker Brothers Life Sciences Capital (GP), LLC.