| 4 | DIMENSIONAL FUND ADVISORS LP | 6.3M | $14.7M | -1.0% | 3.569% | 0.00% |
| 5 | ROYCE & ASSOCIATES LP | 5.1M | $11.9M | +4.3% | 2.890% | 0.10% |
| 6 | VANGUARD CAPITAL MANAGEMENT LLC | 3.9M | $9.2M | -6.9% | 2.229% | 0.00% |
| 7 | VANGUARD PORTFOLIO MANAGEMENT LLC | 3.5M | $8.2M | +5.3% | 1.995% | 0.00% |
| 8 | PARADIGM CAPITAL MANAGEMENT INC/NY | 3.0M | $7.1M | -62.2% | 1.724% | 0.19% |
| 9 | GEODE CAPITAL MANAGEMENT, LLC | 2.5M | $5.8M | +2.9% | 1.411% | 0.00% |
| 10 | Connor, Clark & Lunn Investment Management Ltd. | 2.2M | $5.2M | +5.9% | 1.256% | 0.01% |
| 11 | STATE STREET CORP | 1.9M | $4.5M | +1.1% | 1.096% | 0.00% |
| 12 | D. E. Shaw & Co., Inc. | 1.8M | $4.2M | +16.4% | 1.016% | 0.00% |
| 13 | AQR CAPITAL MANAGEMENT LLC | 1.4M | $3.3M | +12.1% | 0.800% | 0.00% |
| 14 | FIRST WILSHIRE SECURITIES MANAGEMENT INC | 1.4M | $3.3M | -0.2% | 0.797% | 0.68% |
| 15 | CITADEL ADVISORS LLC | 1.3M | $3.0M | +114.1% | 0.720% | 0.00% |
| 16 | ARROWSTREET CAPITAL, LIMITED PARTNERSHIP | 1.2M | $2.8M | -0.1% | 0.690% | 0.00% |
| 17 | MARSHALL WACE, LLP | 814K | $1.9M | +5.8% | 0.462% | 0.00% |
| 18 | CHARLES SCHWAB INVESTMENT MANAGEMENT INC | 800K | $1.9M | +13.0% | 0.454% | 0.00% |
| 19 | NORTHERN TRUST CORP | 750K | $1.8M | +6.2% | 0.426% | 0.00% |
| 20 | MILLENNIUM MANAGEMENT LLC | 698K | $1.6M | +42.2% | 0.396% | 0.00% |
| 21 | VANGUARD FIDUCIARY TRUST CO | 613K | $1.4M | +4.3% | 0.348% | 0.00% |
| 22 | JACOBS LEVY EQUITY MANAGEMENT, INC | 582K | $1.4M | -15.1% | 0.331% | 0.00% |
| 23 | VICTORY CAPITAL MANAGEMENT INC | 456K | $1.1M | +8.1% | 0.259% | 0.00% |
| 24 | Silverberg Bernstein Capital Management LLC | 419K | $980K | -4.4% | 0.238% | 0.38% |
| 25 | GOLDMAN SACHS GROUP INC | 415K | $972K | -44.2% | 0.236% | 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.
| 73.47% |
| +0.98 pp |
| $492M |
| 3.3% |
| Q4 2024 | 130 | +4.8% | 72.49% | +0.06 pp | $509M | +29% |
| Q3 2024 | 124 | — | 72.43% | — | $396M | — |
Source: SEC 13F institutional filings. Ownership % requires market cap data and will show once linked. Δ columns compare to the immediately prior filed quarter.
21 institutions opened new positions in RBBN during Q2 2026, while 13 fully exited. 111 added to existing positions and 25 trimmed.
RBBN institutional ownership fell by 1.91 percentage points quarter-over-quarter, with a net change of +9 holders.
The top 10 institutions account for 81.8% of all reported 13F value in RBBN, and the top 25 account for 93.8%.
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