<SEC-DOCUMENT>0000950170-24-115295-index.html : 20241017
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<ACCEPTANCE-DATETIME>20241017160504
ACCESSION NUMBER:		0000950170-24-115295
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20241015
FILED AS OF DATE:		20241017
DATE AS OF CHANGE:		20241017

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Blavatnik Len
		CENTRAL INDEX KEY:			0001326628
		ORGANIZATION NAME:           	

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-42366
		FILM NUMBER:		241377626

	MAIL ADDRESS:	
		STREET 1:		C/O ACCESS INDUSTRIES
		STREET 2:		730 FIFTH AVENUE
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10019

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Access Industries Holdings LLC
		CENTRAL INDEX KEY:			0001391297
		ORGANIZATION NAME:           	
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-42366
		FILM NUMBER:		241377628

	BUSINESS ADDRESS:	
		STREET 1:		C/O ACCESS INDUSTRIES MANAGEMENT, LLC.
		STREET 2:		730 FIFTH AVENUE, 20TH FLOOR
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10019
		BUSINESS PHONE:		212 247 6400

	MAIL ADDRESS:	
		STREET 1:		C/O ACCESS INDUSTRIES MANAGEMENT, LLC.
		STREET 2:		730 FIFTH AVENUE, 20TH FLOOR
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10019

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			AI Upstream LLC
		CENTRAL INDEX KEY:			0002039907
		ORGANIZATION NAME:           	
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-42366
		FILM NUMBER:		241377630

	BUSINESS ADDRESS:	
		STREET 1:		ACCESS INDUSTRIES MANAGEMENT LLC
		STREET 2:		40 WEST 57TH STREET, 28TH FLOOR
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10019
		BUSINESS PHONE:		212-247-6400

	MAIL ADDRESS:	
		STREET 1:		ACCESS INDUSTRIES MANAGEMENT LLC
		STREET 2:		40 WEST 57TH STREET, 28TH FLOOR
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10019

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			AI Biotechnology LLC
		CENTRAL INDEX KEY:			0001942670
		ORGANIZATION NAME:           	
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-42366
		FILM NUMBER:		241377629

	BUSINESS ADDRESS:	
		STREET 1:		C/O ACCESS INDUSTRIES, INC.
		STREET 2:		40 WEST 57TH STREET, 28TH FLOOR
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10019
		BUSINESS PHONE:		212-247-6400

	MAIL ADDRESS:	
		STREET 1:		C/O ACCESS INDUSTRIES, INC.
		STREET 2:		40 WEST 57TH STREET, 28TH FLOOR
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10019

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			ACCESS INDUSTRIES MANAGEMENT, LLC
		CENTRAL INDEX KEY:			0001508226
		ORGANIZATION NAME:           	
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-42366
		FILM NUMBER:		241377627

	BUSINESS ADDRESS:	
		STREET 1:		730 FIFTH AVENUE
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10019
		BUSINESS PHONE:		2122476400

	MAIL ADDRESS:	
		STREET 1:		730 FIFTH AVENUE
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10019

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			Upstream Bio, Inc.
		CENTRAL INDEX KEY:			0002022626
		STANDARD INDUSTRIAL CLASSIFICATION:	PHARMACEUTICAL PREPARATIONS [2834]
		ORGANIZATION NAME:           	03 Life Sciences
		IRS NUMBER:				000000000
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		890 WINTER STREET, SUITE 200
		CITY:			WALTHAM
		STATE:			MA
		ZIP:			02451
		BUSINESS PHONE:		781-208-2466

	MAIL ADDRESS:	
		STREET 1:		890 WINTER STREET, SUITE 200
		CITY:			WALTHAM
		STATE:			MA
		ZIP:			02451
</SEC-HEADER>
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