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Ribbon Communications
RBBN

153 hedge funds and large institutions have $489M invested in Ribbon Communications in 2025 Q3 according to their latest regulatory filings, with 25 funds opening new positions, 50 increasing their positions, 44 reducing their positions, and 16 closing their positions.

New
Increased
Maintained
Reduced
Closed

56% more first-time investments, than exits

New positions opened: 25 | Existing positions closed: 16

14% more repeat investments, than reductions

Existing positions increased: 50 | Existing positions reduced: 44

6% more funds holding

Funds holding: 145 → 153 (+8)

0.77% more ownership

Funds ownership: 72.57% → 73.34% (+0.77%)

4% less capital invested

Capital invested by funds: $509M → $489M (-$20.3M)

Holders
153
Holders Change
+8
Holders Change %
+5.52%
% of All Funds
2.01%
Holding in Top 10
–
Holding in Top 10 Change
–
Holding in Top 10 Change %
–
% of All Funds
–
New
25
Increased
50
Reduced
44
Closed
16
Calls
$849K
Puts
–
Net Calls
+$849K
Net Calls Change
-$77K

Top Buyers

Rank Fund Capital Flow
1
RA
Royce & Associates
New York
+$2.49M
2
CCM
Cinctive Capital Management
New York
+$2.06M
3
Arrowstreet Capital
Arrowstreet Capital
Massachusetts
+$1.89M
4
Connor, Clark & Lunn Investment Management (CC&L)
Connor, Clark & Lunn Investment Management (CC&L)
British Columbia, Canada
+$1.53M
5
Marshall Wace
Marshall Wace
United Kingdom
+$1.36M

Top Sellers

Rank Fund Capital Flow
1
Millennium Management
Millennium Management
New York
-$3.33M
2
Franklin Resources
Franklin Resources
California
-$1.94M
3
Neuberger Berman Group
Neuberger Berman Group
New York
-$817K
4
UBS AM
UBS AM
Illinois
-$599K
5
Victory Capital Management
Victory Capital Management
Texas
-$537K
Name Holding Trade Value Shares
Change 		Change in
Stake
Marshall Wace
26
Marshall Wace
United Kingdom
$1.32M +$1.36M +346,095 New
Bank of New York Mellon
27
Bank of New York Mellon
New York
$1.28M +$29.9K +7,612 +2%
Russell Investments Group
28
Russell Investments Group
United Kingdom
$1.25M +$499K +126,963 +62%
WPC
29
White Pine Capital
Minnesota
$1.14M -$464K -118,172 -28%
Commonwealth Equity Services
30
Commonwealth Equity Services
Massachusetts
$1.09M -$17.8K -4,532 -2%
State of Wisconsin Investment Board
31
State of Wisconsin Investment Board
Wisconsin
$1.06M +$10.2K +2,586 +0.9%
N
32
Nuveen
North Carolina
$1.04M +$15.6K +3,959 +1%
AIM
33
AXA Investment Managers
France
$1.02M +$1.06M +269,401 New
PRCP
34
Pacific Ridge Capital Partners
Oregon
$894K – – –
UBS AM
35
UBS AM
Illinois
$830K -$599K -152,464 -41%
GCP
36
GSA Capital Partners
United Kingdom
$822K +$24.3K +6,173 +3%
Lazard Asset Management
37
Lazard Asset Management
New York
$794K +$821K +208,956 New
American Century Companies
38
American Century Companies
Missouri
$791K +$94.5K +24,055 +13%
Jane Street
39
Jane Street
New York
$763K +$505K +128,424 +177%
Swiss National Bank
40
Swiss National Bank
Switzerland
$705K – – –
Invesco
41
Invesco
Georgia
$657K +$13.6K +3,471 +2%
AQR Capital Management
42
AQR Capital Management
Connecticut
$643K -$220K -55,993 -25%
RhumbLine Advisers
43
RhumbLine Advisers
Massachusetts
$615K -$58.1K -14,777 -8%
UBS Group
44
UBS Group
Switzerland
$614K -$422K -107,405 -40%
PCM
45
Penn Capital Management
Pennsylvania
$608K +$158K +40,314 +34%
Barclays
46
Barclays
United Kingdom
$588K -$178K -45,278 -23%
XT
47
XTX Topco
Cayman Islands
$571K +$363K +92,363 +159%
VOYA Investment Management
48
VOYA Investment Management
Georgia
$558K -$72.8K -18,516 -11%
LSV Asset Management
49
LSV Asset Management
Illinois
$516K +$534K +135,800 New
Squarepoint
50
Squarepoint
New York
$483K +$500K +127,152 New
1
2
3 4 5

RBBN Hedge Fund Activity: Q3 2025 in Review

153 of the 7,621 institutional investors tracked by Wall St. Rank reported a position in Ribbon Communications (RBBN) for Q3 2025, worth a combined $489M — down 4% from $509M a quarter earlier.

Buyers outnumbered sellers: 25 funds opened new RBBN positions and 16 closed out — a net gain of 9 holders — while 50 added to existing stakes and 44 trimmed.

The largest buyer was Royce & Associates, adding an estimated $2.49M. The largest seller was Millennium Management, exiting entirely with an estimated $3.33M sold.

  • 153 institutional investors held Ribbon Communications (RBBN) as of Q3 2025, up from 145 in Q2 2025.
  • Funds reported $489M of Ribbon Communications stock for Q3 2025, down 4% quarter-over-quarter.
  • 25 funds opened new Ribbon Communications positions in Q3 2025 and 16 closed out, a net change of +9 holders.
  • The largest Ribbon Communications buyer in Q3 2025 was Royce & Associates, an estimated $2.49M added.
  • The largest Ribbon Communications seller in Q3 2025 was Millennium Management, an estimated $3.33M sold.

Based on aggregated 13F filings for Q3 2025.