Ribbon Communications
RBBN
145 hedge funds and large institutions have $509M invested in Ribbon Communications in 2025 Q2 according to their latest regulatory filings, with 22 funds opening new positions, 60 increasing their positions, 34 reducing their positions, and 20 closing their positions.
76% more repeat investments, than reductions
Existing positions increased: 60 | Existing positions reduced: 34
10% more first-time investments, than exits
New positions opened: 22 | Existing positions closed: 20
3% more capital invested
Capital invested by funds: $495M → $509M (+$13.7M)
1% more funds holding
Funds holding: 144 → 145 (+1)
0.05% more ownership
Funds ownership: 72.51% → 72.57% (+0.05%)
Top Buyers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
Millennium Management
New York
|
+$2.11M |
| 2 |
RA
Royce & Associates
New York
|
+$2.09M |
| 3 |
Connor, Clark & Lunn Investment Management (CC&L)
Vancouver,
British Columbia, Canada
|
+$1.03M |
| 4 |
Northern Trust
Chicago,
Illinois
|
+$692K |
| 5 |
Dimensional Fund Advisors
Austin,
Texas
|
+$691K |
Top Sellers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
PCMI
Paradigm Capital Management Inc
Albany,
New York
|
-$2.75M |
| 2 |
HIM
Hillsdale Investment Management
Toronto,
Ontario, Canada
|
-$1.28M |
| 3 |
Bank of America
Charlotte,
North Carolina
|
-$780K |
| 4 |
II
Inspire Investing
Meridian,
Idaho
|
-$756K |
| 5 |
BCM
Bridgeway Capital Management
Houston,
Texas
|
-$698K |
RBBN Hedge Fund Activity: Q2 2025 in Review
145 of the 7,613 institutional investors tracked by Wall St. Rank reported a position in Ribbon Communications (RBBN) for Q2 2025, worth a combined $509M — up 2.8% from $495M a quarter earlier.
Buyers outnumbered sellers: 22 funds opened new RBBN positions and 20 closed out — a net gain of 2 holders — while 60 added to existing stakes and 34 trimmed.
The largest buyer was Millennium Management, adding an estimated $2.11M. The largest seller was Paradigm Capital Management Inc, cutting an estimated $2.75M.
- 145 institutional investors held Ribbon Communications (RBBN) as of Q2 2025, up from 144 in Q1 2025.
- Funds reported $509M of Ribbon Communications stock for Q2 2025, up 2.8% quarter-over-quarter.
- 22 funds opened new Ribbon Communications positions in Q2 2025 and 20 closed out, a net change of +2 holders.
- The largest Ribbon Communications buyer in Q2 2025 was Millennium Management, an estimated $2.11M added.
- The largest Ribbon Communications seller in Q2 2025 was Paradigm Capital Management Inc, an estimated $2.75M sold.
Based on aggregated 13F filings for Q2 2025.