UPB Upstream Bio, Inc.

NASDAQ
$5.36

Upstream Bio, Inc. (UPB) Institutional Ownership

What the institutions did with UPB last quarter, from their 13F filings. Counting managers rather than shares is the point: a single index fund adding to a position tells you far less than four hundred separate managers all deciding to. Positions as reported for the quarter ended June 30, 2026.

Managers compared
174
filed both this quarter and last
Managers holding
146
+7 on the quarter
Buyers
100
35 opened new
Sellers
56
28 sold out entirely
Buyer share
64.1%
of managers who traded it
Breadth
+28.2
net buyers, as a share of those trading

Every manager below opens. Subscribers can see any firm's whole portfolio — every position, its weight, and what they bought, trimmed and exited last quarter.

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Ownership map

Each block is one manager, sized by shares held and colored by how much they moved the position last quarter. Green added, red cut, grey stood pat.

Cut Unchanged Added Color saturates at ±50%.

Largest holders

Manager Shares % of reported
FMR LLC 8.2M 16.1%
ORBIMED ADVISORS LLC 5.7M 11.3%
NORGES BANK 3.8M 7.5%
BlackRock, Inc. 3.8M 7.4%
Decheng Capital LLC 2.7M 5.4%
ENAVATE SCIENCES GP, LLC 2.5M 4.9%
VANGUARD CAPITAL MANAGEMENT LLC 1.9M 3.7%
MILLENNIUM MANAGEMENT LLC 1.1M 2.3%
D. E. Shaw & Co., Inc. 1.0M 2.0%
JPMORGAN CHASE & CO 1.0M 2.0%
Qube Research & Technologies Ltd 978.5K 1.9%
Parkman Healthcare Partners LLC 935.2K 1.8%
GEODE CAPITAL MANAGEMENT, LLC 931.3K 1.8%
SEB Asset Management AB 878.5K 1.7%
Woodline Partners LP 831.5K 1.6%
STATE STREET CORP 766.3K 1.5%
VANGUARD PORTFOLIO MANAGEMENT LLC 712.7K 1.4%
Y-Intercept (Hong Kong) Ltd 693.6K 1.4%
Bain Capital Life Sciences Investors, LLC 600.9K 1.2%
AQR CAPITAL MANAGEMENT LLC 544.9K 1.1%
MORGAN STANLEY 524.6K 1.0%
BNP PARIBAS FINANCIAL MARKETS 511.5K 1.0%
Walleye Capital LLC 498.5K 1.0%
Trexquant Investment LP 466.4K 0.9%
Point72 Asset Management, L.P. 453.0K 0.9%

Largest changes

Manager Action Previous Current Change
FEDERATED HERMES, INC. Sold Out 979.8K 0 -979.8K
Pictet Asset Management Holding SA Sold Out 733.4K 0 -733.4K
HSBC HOLDINGS PLC Reduced 640.3K 10.8K -629.5K
JPMORGAN CHASE & CO Increased 463.0K 1.0M +549.0K
Walleye Capital LLC New 0 498.5K +498.5K
AQR CAPITAL MANAGEMENT LLC Increased 72.2K 544.9K +472.7K
Nantahala Capital Management, LLC Sold Out 400.0K 0 -400.0K
BNP PARIBAS FINANCIAL MARKETS Increased 126.0K 511.5K +385.5K
BlackRock, Inc. Increased 3.4M 3.8M +382.7K
SAMSARA BIOCAPITAL, LLC Reduced 736.0K 353.7K -382.3K
Qube Research & Technologies Ltd Increased 619.3K 978.5K +359.2K
BANK OF AMERICA CORP /DE/ Increased 48.5K 391.8K +343.3K
Y-Intercept (Hong Kong) Ltd Reduced 1.0M 693.6K -307.1K
DIMENSIONAL FUND ADVISORS LP Increased 80.0K 381.6K +301.6K
Alyeska Investment Group, L.P. Sold Out 298.3K 0 -298.3K
Trexquant Investment LP Increased 176.7K 466.4K +289.8K
Voleon Capital Management LP New 0 285.2K +285.2K
Point72 Asset Management, L.P. Increased 178.2K 453.0K +274.8K
Bain Capital Life Sciences Investors, LLC Reduced 867.2K 600.9K -266.3K
JACOBS LEVY EQUITY MANAGEMENT, INC New 0 253.1K +253.1K
Squarepoint Ops LLC Increased 44.6K 290.9K +246.3K
Prosight Management, LP Sold Out 241.1K 0 -241.1K
D. E. Shaw & Co., Inc. Increased 820.5K 1.0M +215.6K
MILLENNIUM MANAGEMENT LLC Increased 937.3K 1.1M +206.5K
TCG Crossover Management, LLC Sold Out 181.1K 0 -181.1K
ACADIAN ASSET MANAGEMENT LLC New 0 175.1K +175.1K
ARROWSTREET CAPITAL, LIMITED PARTNERSHIP Increased 185.1K 357.8K +172.7K
HRT FINANCIAL LP New 0 170.6K +170.6K
Parkman Healthcare Partners LLC Increased 786.8K 935.2K +148.5K
SPHERA FUNDS MANAGEMENT LTD. Reduced 358.0K 219.7K -138.3K
ALGERT GLOBAL LLC New 0 118.6K +118.6K
Jump Financial, LLC Reduced 319.4K 223.2K -96.2K
GOLDMAN SACHS GROUP INC Reduced 316.6K 246.9K -69.7K
RENAISSANCE TECHNOLOGIES LLC Increased 62.1K 131.3K +69.2K
MARSHALL WACE, LLP Sold Out 66.8K 0 -66.8K
Schonfeld Strategic Advisors LLC Increased 161.3K 225.8K +64.4K
FMR LLC Increased 8.1M 8.2M +61.3K
STATE STREET CORP Increased 705.4K 766.3K +61.0K
DEUTSCHE BANK AG\ Increased 180.9K 241.4K +60.6K
EntryPoint Capital, LLC Increased 73.6K 129.4K +55.9K
Man Group plc Increased 21.2K 73.8K +52.7K
ExodusPoint Capital Management, LP Reduced 91.4K 41.0K -50.4K
Brevan Howard Capital Management LP New 0 50.4K +50.4K
Russell Investments Group, Ltd. Increased 3.6K 47.5K +43.9K
Virtus Investment Advisers, LLC Increased 10.0K 53.6K +43.6K
Allspring Global Investments Holdings, LLC New 0 43.2K +43.2K
TWO SIGMA INVESTMENTS, LP New 0 42.3K +42.3K
NORTHERN TRUST CORP Increased 261.0K 297.3K +36.4K
CITIGROUP INC Increased 5.1K 40.3K +35.3K
ADAR1 Capital Management, LLC Sold Out 35.0K 0 -35.0K
XTX Topco Ltd Increased 209.3K 242.3K +33.1K
Aquatic Capital Management LLC Sold Out 31.5K 0 -31.5K
GSA CAPITAL PARTNERS LLP Increased 39.2K 69.3K +30.1K
Bleakley Financial Group, LLC Sold Out 28.9K 0 -28.9K
MORGAN STANLEY Reduced 552.6K 524.6K -28.0K
Quantbot Technologies LP Increased 663 28.2K +27.5K
TUDOR INVESTMENT CORP ET AL Sold Out 26.4K 0 -26.4K
MARTINGALE ASSET MANAGEMENT L P Sold Out 26.2K 0 -26.2K
VICTORY CAPITAL MANAGEMENT INC Sold Out 25.9K 0 -25.9K
STATE OF WISCONSIN INVESTMENT BOARD Reduced 41.7K 17.1K -24.6K

13F filings are due 45 days after quarter end and cover long positions in U.S.-listed equities only, so this is a lagged and partial picture: shorts, bonds and foreign listings never appear. Options positions are excluded here rather than folded into the share counts. Political ownership is coming.