RBBN Ribbon Communications Inc.

NASDAQ
$1.72

Ribbon Communications Inc. (RBBN) Institutional Ownership

What the institutions did with RBBN 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
171
filed both this quarter and last
Managers holding
159
+10 on the quarter
Buyers
87
22 opened new
Sellers
54
12 sold out entirely
Buyer share
61.7%
of managers who traded it
Breadth
+23.4
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.

Sign in or subscribe

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
JPMORGAN CHASE & CO 52.0M 40.6%
NEUBERGER BERMAN GROUP LLC 18.3M 14.3%
BlackRock, Inc. 7.1M 5.6%
DIMENSIONAL FUND ADVISORS LP 6.3M 4.9%
ROYCE & ASSOCIATES LP 5.1M 4.0%
VANGUARD CAPITAL MANAGEMENT LLC 3.9M 3.1%
VANGUARD PORTFOLIO MANAGEMENT LLC 3.5M 2.7%
PARADIGM CAPITAL MANAGEMENT INC/NY 3.0M 2.4%
GEODE CAPITAL MANAGEMENT, LLC 2.5M 1.9%
Connor, Clark & Lunn Investment Management Ltd. 2.2M 1.7%
STATE STREET CORP 1.9M 1.5%
D. E. Shaw & Co., Inc. 1.8M 1.4%
ACADIAN ASSET MANAGEMENT LLC 1.8M 1.4%
AQR CAPITAL MANAGEMENT LLC 1.4M 1.1%
FIRST WILSHIRE SECURITIES MANAGEMENT INC 1.4M 1.1%
CITADEL ADVISORS LLC 1.2M 1.0%
ARROWSTREET CAPITAL, LIMITED PARTNERSHIP 1.2M 0.9%
MARSHALL WACE, LLP 814.1K 0.6%
CHARLES SCHWAB INVESTMENT MANAGEMENT INC 800.2K 0.6%
NORTHERN TRUST CORP 749.8K 0.6%
MILLENNIUM MANAGEMENT LLC 698.5K 0.5%
VANGUARD FIDUCIARY TRUST CO 612.8K 0.5%
JACOBS LEVY EQUITY MANAGEMENT, INC 582.1K 0.5%
VICTORY CAPITAL MANAGEMENT INC 456.4K 0.4%
Silverberg Bernstein Capital Management LLC 418.8K 0.3%

Largest changes

Manager Action Previous Current Change
PARADIGM CAPITAL MANAGEMENT INC/NY Reduced 8.0M 3.0M -5.0M
NEUBERGER BERMAN GROUP LLC Increased 17.4M 18.3M +949.1K
CITADEL ADVISORS LLC Increased 575.0K 1.2M +666.2K
BlackRock, Inc. Increased 6.7M 7.1M +422.6K
ACADIAN ASSET MANAGEMENT LLC Increased 1.4M 1.8M +329.7K
GOLDMAN SACHS GROUP INC Reduced 744.7K 415.4K -329.3K
BNP PARIBAS ASSET MANAGEMENT Holding S.A. New 0 303.6K +303.6K
VANGUARD CAPITAL MANAGEMENT LLC Reduced 4.2M 3.9M -290.8K
D. E. Shaw & Co., Inc. Increased 1.5M 1.8M +251.9K
ROYCE & ASSOCIATES LP Increased 4.9M 5.1M +211.2K
MILLENNIUM MANAGEMENT LLC Increased 491.3K 698.5K +207.1K
OP Asset Management Ltd Sold Out 206.8K 0 -206.8K
Squarepoint Ops LLC New 0 191.4K +191.4K
VANGUARD PORTFOLIO MANAGEMENT LLC Increased 3.3M 3.5M +177.4K
XTX Topco Ltd Increased 160.9K 323.3K +162.4K
AQR CAPITAL MANAGEMENT LLC Increased 1.3M 1.4M +152.4K
Engineers Gate Manager LP Sold Out 140.0K 0 -140.0K
Qube Research & Technologies Ltd New 0 137.9K +137.9K
Connor, Clark & Lunn Investment Management Ltd. Increased 2.1M 2.2M +123.4K
GSA CAPITAL PARTNERS LLP Reduced 292.8K 174.0K -118.7K
JACOBS LEVY EQUITY MANAGEMENT, INC Reduced 685.3K 582.1K -103.2K
TWO SIGMA INVESTMENTS, LP New 0 102.2K +102.2K
HERALD INVESTMENT MANAGEMENT Ltd Sold Out 100.0K 0 -100.0K
WINTON GROUP Ltd Increased 50.1K 149.4K +99.3K
CHARLES SCHWAB INVESTMENT MANAGEMENT INC Increased 708.2K 800.2K +92.0K
Hillsdale Investment Management Inc. New 0 91.0K +91.0K
SIMPLEX TRADING, LLC New 0 73.9K +73.9K
GEODE CAPITAL MANAGEMENT, LLC Increased 2.4M 2.5M +70.5K
HighMark Wealth Management LLC New 0 69.0K +69.0K
Susquehanna Portfolio Strategies, LLC Reduced 93.2K 24.3K -68.9K
PRUDENTIAL FINANCIAL INC Increased 14.6K 82.9K +68.3K
DIMENSIONAL FUND ADVISORS LP Reduced 6.4M 6.3M -64.8K
DEUTSCHE BANK AG\ Increased 25.4K 81.9K +56.6K
State of Wyoming Sold Out 54.9K 0 -54.9K
CITIGROUP INC Increased 36.6K 87.9K +51.3K
Dynamic Technology Lab Private Ltd Increased 59.5K 104.9K +45.4K
MARSHALL WACE, LLP Increased 769.8K 814.1K +44.3K
WELLS FARGO & COMPANY/MN Increased 37.4K 81.5K +44.1K
NORTHERN TRUST CORP Increased 705.9K 749.8K +44.0K
MORGAN STANLEY Reduced 423.5K 379.8K -43.7K
Pacific Ridge Capital Partners, LLC Increased 246.2K 286.2K +40.0K
Assenagon Asset Management S.A. Increased 37.9K 75.9K +37.9K
Creative Planning Increased 64.9K 100.6K +35.7K
Worth Venture Partners, LLC New 0 35.0K +35.0K
VICTORY CAPITAL MANAGEMENT INC Increased 422.4K 456.4K +34.1K
Russell Investments Group, Ltd. Increased 351.9K 385.2K +33.4K
EntryPoint Capital, LLC Increased 140.3K 172.9K +32.6K
Virtu Financial LLC Increased 25.7K 57.9K +32.2K
UBS Group AG Reduced 192.9K 165.4K -27.5K
HSBC HOLDINGS PLC New 0 27.0K +27.0K
Brevan Howard Capital Management LP New 0 26.2K +26.2K
VANGUARD FIDUCIARY TRUST CO Increased 587.4K 612.8K +25.3K
ExodusPoint Capital Management, LP Reduced 196.9K 172.6K -24.3K
MACKENZIE FINANCIAL CORP New 0 22.4K +22.4K
JANE STREET GROUP, LLC New 0 21.9K +21.9K
Schonfeld Strategic Advisors LLC Sold Out 21.8K 0 -21.8K
Mariner, LLC Increased 23.1K 43.3K +20.2K
STATE STREET CORP Increased 1.9M 1.9M +20.1K
BANK OF AMERICA CORP /DE/ Reduced 208.2K 188.4K -19.8K
Silverberg Bernstein Capital Management LLC Reduced 438.1K 418.8K -19.3K

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.