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Ribbon Communications
RBBN

153 hedge funds and large institutions have $369M invested in Ribbon Communications in 2025 Q4 according to their latest regulatory filings, with 25 funds opening new positions, 56 increasing their positions, 51 reducing their positions, and 24 closing their positions.

New
Increased
Maintained
Reduced
Closed

10% more repeat investments, than reductions

Existing positions increased: 56 | Existing positions reduced: 51

4% more first-time investments, than exits

New positions opened: 25 | Existing positions closed: 24

0.08% more ownership

Funds ownership: 73.34% → 73.41% (+0.08%)

0% more funds holding

Funds holding: 153 → 153 (0)

24% less capital invested

Capital invested by funds: $489M → $369M (-$119M)

Holders
153
Holders Change
–
Holders Change %
0%
% of All Funds
1.86%
Holding in Top 10
–
Holding in Top 10 Change
–
Holding in Top 10 Change %
–
% of All Funds
–
New
25
Increased
56
Reduced
51
Closed
24
Calls
$738K
Puts
–
Net Calls
+$738K
Net Calls Change
-$111K

Top Buyers

Rank Fund Capital Flow
1
Acadian Asset Management
Acadian Asset Management
Massachusetts
+$2.34M
2
KCM
Kennedy Capital Management
Missouri
+$2.29M
3
Jacobs Levy Equity Management
Jacobs Levy Equity Management
New Jersey
+$1.35M
4
D.E. Shaw & Co
D.E. Shaw & Co
New York
+$1.26M
5
Goldman Sachs
Goldman Sachs
New York
+$1.17M

Top Sellers

Rank Fund Capital Flow
1
Neuberger Berman Group
Neuberger Berman Group
New York
-$2.66M
2
CCM
Cinctive Capital Management
New York
-$1.99M
3
Franklin Resources
Franklin Resources
California
-$1.7M
4
PCMI
Paradigm Capital Management Inc
New York
-$1.37M
5
Raymond James Financial
Raymond James Financial
Florida
-$1.33M
Name Holding Trade Value Shares
Change 		Change in
Stake
XT
51
XTX Topco
Cayman Islands
$296K -$153K -47,473 -32%
Legal & General Group
52
Legal & General Group
United Kingdom
$272K -$24.9K -7,713 -8%
DTL
53
Dynamic Technology Lab
Singapore
$262K +$67.7K +20,982 +30%
California State Teachers Retirement System (CalSTRS)
54
California State Teachers Retirement System (CalSTRS)
California
$255K -$236 -73 -0.1%
Russell Investments Group
55
Russell Investments Group
United Kingdom
$252K -$783K -242,655 -73%
Deutsche Bank
56
Deutsche Bank
Germany
$247K +$14.1K +4,379 +5%
B
57
Bailard
California
$215K +$8.39K +2,600 +4%
Franklin Resources
58
Franklin Resources
California
$205K -$1.7M -526,459 -88%
T. Rowe Price Associates
59
T. Rowe Price Associates
Maryland
$202K +$29.4K +9,103 +15%
TC
60
Trilogy Capital
California
$188K +$131K +40,510 +163%
Ohio Public Employees Retirement System (OPERS)
61
Ohio Public Employees Retirement System (OPERS)
Ohio
$175K +$31.3K +9,700 +19%
OAM
62
Oxford Asset Management
United Kingdom
$160K +$179K +55,568 New
EGM
63
Engineers Gate Manager
New York
$160K +$179K +55,480 New
SFI
64
Susquehanna Fundamental Investments
Pennsylvania
$157K +$117K +36,136 +196%
Millennium Management
65
Millennium Management
New York
$156K +$175K +54,306 New
Citadel Advisors
66
Citadel Advisors
Florida
$155K -$5.33K -1,651 -3%
Los Angeles Capital Management
67
Los Angeles Capital Management
California
$142K +$2.38K +738 +2%
Zurich Cantonal Bank
68
Zurich Cantonal Bank
Switzerland
$136K – – –
Qube Research & Technologies (QRT)
69
Qube Research & Technologies (QRT)
United Kingdom
$127K +$142K +44,058 New
Mirae Asset Global ETFs Holdings
70
Mirae Asset Global ETFs Holdings
Hong Kong
$126K -$3.67K -1,137 -3%
SG Americas Securities
71
SG Americas Securities
New York
$120K +$67.9K +21,041 +103%
PCM
72
Prelude Capital Management
New York
$117K +$25.5K +7,900 +24%
BNP Paribas Asset Management
73
BNP Paribas Asset Management
France
$117K +$123K +38,121 +1,498%
Verition Fund Management
74
Verition Fund Management
Connecticut
$117K +$131K +40,496 New
Assenagon Asset Management
75
Assenagon Asset Management
Luxembourg
$116K -$33.2K -10,288 -20%
1 2
3
4 5

RBBN Hedge Fund Activity: Q4 2025 in Review

153 of the 8,223 institutional investors tracked by Wall St. Rank reported a position in Ribbon Communications (RBBN) for Q4 2025, worth a combined $369M — down 24% from $489M a quarter earlier.

Buyers outnumbered sellers: 25 funds opened new RBBN positions and 24 closed out — a net gain of 1 holder — while 56 added to existing stakes and 51 trimmed.

The largest buyer was Acadian Asset Management, adding an estimated $2.34M. The largest seller was Neuberger Berman Group, cutting an estimated $2.66M.

  • 153 institutional investors held Ribbon Communications (RBBN) as of Q4 2025, unchanged from Q3 2025.
  • Funds reported $369M of Ribbon Communications stock for Q4 2025, down 24% quarter-over-quarter.
  • 25 funds opened new Ribbon Communications positions in Q4 2025 and 24 closed out, a net change of +1 holder.
  • The largest Ribbon Communications buyer in Q4 2025 was Acadian Asset Management, an estimated $2.34M added.
  • The largest Ribbon Communications seller in Q4 2025 was Neuberger Berman Group, an estimated $2.66M sold.

Based on aggregated 13F filings for Q4 2025.