-----BEGIN PRIVACY-ENHANCED MESSAGE-----
Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
Originator-Key-Asymmetric:
 MFgwCgYEVQgBAQICAf8DSgAwRwJAW2sNKK9AVtBzYZmr6aGjlWyK3XmZv3dTINen
 TWSM7vrzLADbmYQaionwg5sDW3P6oaM5D3tdezXMm7z1T+B+twIDAQAB
MIC-Info: RSA-MD5,RSA,
 MZBMV8A4HuJaF9YgvTf0Mb4KxaLeMNw5tVZvdz901debQneFYsjjIjN4jDz48szL
 RHfyDjqcCrItWJkRozi0Og==

<SEC-DOCUMENT>0000905718-05-000103.txt : 20050404
<SEC-HEADER>0000905718-05-000103.hdr.sgml : 20050404
<ACCEPTANCE-DATETIME>20050404115851
ACCESSION NUMBER:		0000905718-05-000103
CONFORMED SUBMISSION TYPE:	SC 13D/A
PUBLIC DOCUMENT COUNT:		1
FILED AS OF DATE:		20050404
DATE AS OF CHANGE:		20050404

SUBJECT COMPANY:	

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			AEROGEN INC
		CENTRAL INDEX KEY:			0001039160
		STANDARD INDUSTRIAL CLASSIFICATION:	SURGICAL & MEDICAL INSTRUMENTS & APPARATUS [3841]
		IRS NUMBER:				330488580
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		SC 13D/A
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	005-60561
		FILM NUMBER:		05728207

	BUSINESS ADDRESS:	
		STREET 1:		2071 STIERLIN COURT
		CITY:			MOUNTAIN VIEW
		STATE:			CA
		ZIP:			94043
		BUSINESS PHONE:		650 864-7300

	MAIL ADDRESS:	
		STREET 1:		2071 STIERLIN COURT
		CITY:			MOUNTAIN VIEW
		STATE:			CA
		ZIP:			94043

FILED BY:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			XMARK ASSET MANAGEMENT LLC
		CENTRAL INDEX KEY:			0001118481
		STATE OF INCORPORATION:			NY
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		SC 13D/A

	BUSINESS ADDRESS:	
		STREET 1:		CARNEGIE HALL TOWER
		STREET 2:		152 W 57TH ST 21ST FLOOR
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10019
		BUSINESS PHONE:		2122478200

	MAIL ADDRESS:	
		STREET 1:		CARNEGIE HALL TOWER
		STREET 2:		152 W 57TH ST 21ST FLOOR
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10019

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	BROWN SIMPSON ASSET MANAGEMENT LLC
		DATE OF NAME CHANGE:	20000707
</SEC-HEADER>
<DOCUMENT>
<TYPE>SC 13D/A
<SEQUENCE>1
<FILENAME>aerogen13dam4.txt
<DESCRIPTION>SC13DAM4
</DOCUMENT>
</SUBMISSION>