Ranked by reported Q1 2026 13F market value
Share of total reported institutional value in RBBN held by the largest 10 / 25 filers.
| # | Institution | Shares Held | Market Value | QoQ Change | Ownership % | % of Fund |
|---|---|---|---|---|---|---|
| 1 | Neuberger Berman Group LLC | 17.4M | $33.2M | -0.4% | 9.887% | 0.03% |
| 2 | PARADIGM CAPITAL MANAGEMENT INC/NY | 8.0M | $17.0M | -3.5% | 4.576% | 0.65% |
| 3 | BlackRock, Inc. | 6.7M | $14.3M | -12.3% | 3.829% | 0.00% |
| 4 | DIMENSIONAL FUND ADVISORS LP | 6.4M | $13.5M | -1.9% | 3.617% | 0.00% |
| 5 | ROYCE & ASSOCIATES LP | 4.9M | $10.3M | +5.7% | 2.779% | 0.10% |
| 6 | VANGUARD CAPITAL MANAGEMENT LLC | 4.2M | $8.9M | — | 2.401% | 0.00% |
| 7 | VANGUARD PORTFOLIO MANAGEMENT LLC | 3.3M | $7.1M | — | 1.900% | 0.00% |
| 8 | GEODE CAPITAL MANAGEMENT, LLC | 2.4M | $5.1M | +4.9% | 1.375% | 0.00% |
| 9 | Connor, Clark & Lunn Investment Management Ltd. | 2.1M | $4.4M | +4.7% | 1.190% | 0.01% |
| 10 | STATE STREET CORP | 1.9M | $4.0M | -9.0% | 1.088% | 0.00% |
| 11 | D. E. Shaw & Co., Inc. | 1.5M | $3.3M | +57.0% | 0.876% | 0.00% |
| 12 | FIRST WILSHIRE SECURITIES MANAGEMENT INC | 1.4M | $3.0M | +11.0% | 0.801% | 0.67% |
| 13 | AQR CAPITAL MANAGEMENT LLC | 1.3M | $2.7M | +155.8% | 0.716% | 0.00% |
| 14 | ARROWSTREET CAPITAL, LIMITED PARTNERSHIP | 1.2M | $2.6M | +18.2% | 0.693% | 0.00% |
| 15 | MARSHALL WACE, LLP | 770K | $1.6M | +343.2% | 0.438% | 0.00% |
| 16 | GOLDMAN SACHS GROUP INC | 745K | $1.6M | -5.4% | 0.424% | 0.00% |
| 17 | CHARLES SCHWAB INVESTMENT MANAGEMENT INC | 708K | $1.5M | -7.9% | 0.403% | 0.00% |
| 18 | NORTHERN TRUST CORP | 706K | $1.5M | -23.5% | 0.402% | 0.00% |
| 19 | JACOBS LEVY EQUITY MANAGEMENT, INC | 685K | $1.5M | -23.0% | 0.390% | 0.01% |
| 20 | CITADEL ADVISORS LLC | 593K | $1.3M | +999.7% | 0.338% | 0.00% |
| 21 | VANGUARD FIDUCIARY TRUST CO | 587K | $1.2M | — | 0.334% | 0.00% |
| 22 | MILLENNIUM MANAGEMENT LLC | 491K | $1.0M | +804.7% | 0.280% | 0.00% |
| 23 | Silverberg Bernstein Capital Management LLC | 438K | $929K | +0.5% | 0.249% | 0.51% |
| 24 | MORGAN STANLEY | 423K | $898K | +7.9% | 0.241% | 0.00% |
| 25 | VICTORY CAPITAL MANAGEMENT INC | 422K | $895K | +20.8% | 0.240% | 0.00% |
denotes a marquee investor (Buffett, Burry, ARK, Tiger Global, Pershing Square, Baupost and other widely-followed managers). “% of Fund” shows how much of that investor’s total 13F portfolio is invested in RBBN — a direct measure of their conviction.
Filings activity in RBBN during Q1 2026, grouped by how each filer changed its position.
8 quarters of 13F filings · Δ columns show change vs prior quarter
| Quarter | Inst. Holders | Δ Holders | Ownership % | Δ Ownership | Total 13F Value | Δ Value |
|---|---|---|---|---|---|---|
| Q1 2026 | 148 | 1.3% | 33.11% | 44.30 pp | $156M | 57% |
| Q4 2025 | 150 | +0.7% | 77.41% | 24.11 pp | $366M | 24% |
| Q3 2025 | 149 | +2.8% | 101.52% | 5.68 pp | $480M | 5.3% |
| Q2 2025 | 145 | +1.4% | 107.20% | +2.97 pp | $506M | +2.8% |
| Q1 2025 | 143 | +10% | 104.23% | 3.60 pp | $492M | 3.3% |
| Q4 2024 | 130 | +4.8% | 107.83% | +23.95 pp | $509M | +29% |
| Q3 2024 | 124 | 4.6% | 83.88% | 7.90 pp | $396M | 8.6% |
| Q2 2024 | 130 | — | 91.78% | — | $434M | — |
Source: SEC 13F institutional filings. Ownership % requires market cap data and will show once linked. Δ columns compare to the immediately prior filed quarter.
Quick answers to the most common questions about buying RBBN stock.
Based on Q1 2026 13F filings, institutional ownership of Ribbon Communications Inc. stands at 33.1%, held across 148 reporting institutions.
Neuberger Berman Group LLC is the largest reported institutional holder of RBBN, with approximately 17,361,988 shares worth $0.03B as of Q1 2026.
Yes — 2 widely-followed marquee investors appear among the top 25 institutional holders of RBBN, including CITADEL ADVISORS LLC, MILLENNIUM MANAGEMENT LLC.
Our composite Smart Money Score for RBBN is 41 out of 100 (Neutral). It combines net institutional buying activity, ownership shift, marquee investor presence, and holder-count growth.
38 institutions opened new positions in RBBN during Q1 2026, while 40 fully exited. 25 added to existing positions and 85 trimmed.
RBBN institutional ownership fell by 44.30 percentage points quarter-over-quarter, with a net change of -2 holders.
The top 10 institutions account for 75.4% of all reported 13F value in RBBN, and the top 25 account for 91.6%.
All data is sourced from SEC Form 13F filings, which institutional investment managers with at least $100M in assets are required to file each quarter. We process every 13F filing from EDGAR and recompute the aggregates after each cycle. Insider transactions are sourced from Form 4 filings.
Ribbon Communications Inc. (RBBN) Institutional Ownership