RBBN · Ribbon Communications Inc. · Holdings
Institutional ownership from SEC Form 13F filings. Investment managers with more than $100 million in U.S. equities must disclose their positions every quarter, within 45 days of quarter-end, so the holdings shown can lag the market by up to a quarter.
Institutional Ownership Trend
Holder Concentration
Across 160 13F filersWho Holds RBBN
Last 8 quarters through Sep 30, 2026 (filing window open)Each kind of 13F filer's share of the common shares 13F filers report. Holder type comes from regulatory records, never the filer's name; style, turnover and horizon are measured from each filer's own 13F book. The quarter selector does not change this card.
Jun 30, 2026, the newest closed quarter: 160 filers, like-for-like change -0.7%; actively managed books -0.8%; index-like books -0.3%.
| Holder type | Share | Filers | Change |
|---|---|---|---|
| Registered adviser | 29.7% | 84 | -7.7% |
| Exempt adviser | 0.8% | 3 | +22.8% |
| Adviser | 0.3% | 3 | -9.9% |
| Bank | 43.4% | 13 | +0.2% |
| Insurer | 0.1% | 1 | +466.6% |
| Broker-dealer | 0.0% | 2 | +77.3% |
| Benefit plan | 0.1% | 4 | -3.1% |
| Non-US | 0.4% | 7 | +116.5% |
| Holding company | 20.5% | 7 | +3.9% |
| Unknown | 4.8% | 36 | +11.2% |
| Style | Share | Filers | Change |
|---|---|---|---|
| Index-like | 14.4% | 18 | -0.3% |
| Systematic-like | 4.0% | 17 | +40.0% |
| Concentrated | 2.9% | 19 | -56.4% |
| Diversified active | 78.7% | 106 | +2.6% |
| Not measured | 0.0% | 0 | — |
| Unknown | 0.0% | 0 | — |
| Turnover | Share | Filers | Change |
|---|---|---|---|
| Low turnover | 76.0% | 90 | -3.8% |
| Medium turnover | 12.6% | 35 | +7.8% |
| High turnover | 5.1% | 28 | +38.7% |
| Unknown | 6.4% | 7 | -1.1% |
| Not measured | 0.0% | 0 | — |
| Holding horizon | Share | Filers | Change |
|---|---|---|---|
| Short horizon | 7.3% | 18 | -0.2% |
| Medium horizon | 6.3% | 19 | +3.6% |
| Long horizon | 85.4% | 115 | -1.3% |
| Unknown | 1.0% | 8 | +22.6% |
| Not measured | 0.0% | 0 | — |
| 13F book size | Share | Filers | Change |
|---|---|---|---|
| Under $1B | 2.0% | 24 | +0.8% |
| $1B to $10B | 3.4% | 36 | -54.1% |
| $10B to $100B | 9.1% | 43 | +12.9% |
| $100B or more | 85.5% | 57 | +2.6% |
| Not measured | 0.0% | 0 | — |
| Client base | Share | Filers | Change |
|---|---|---|---|
| Individuals and high net worth | 2.0% | 42 | +4.6% |
| Pooled investment vehicles | 3.4% | 15 | +38.9% |
| Registered funds and BDCs | 17.8% | 12 | +1.1% |
| Insurance companies | 0.2% | 3 | +8.1% |
| Governments and sovereign funds | 0.1% | 1 | -1.7% |
| Diversified | 6.1% | 11 | -37.9% |
| Pension and profit sharing plans | 0.0% | 0 | — |
| Other investment advisers | 0.0% | 0 | — |
| Unknown | 70.3% | 76 | +2.5% |
| Private funds | Share | Filers | Change |
|---|---|---|---|
| Hedge funds | 10.8% | 24 | -20.0% |
| Private equity funds | 0.5% | 8 | +17.7% |
| Venture capital funds | 0.0% | 1 | +27.4% |
| Real estate funds | 0.0% | 2 | +112.6% |
| Securitized asset funds | 0.0% | 1 | 0.0% |
| Other private funds | 9.3% | 12 | +1.6% |
| Mixed private funds | 0.1% | 1 | +15.0% |
| Private funds, type not stated | 0.0% | 1 | new |
| No private funds | 9.7% | 37 | +1.2% |
| Unknown | 69.6% | 73 | +2.3% |
| Location | Share | Filers | Change |
|---|---|---|---|
| United States | 96.2% | 136 | -1.3% |
| Outside the US | 3.8% | 24 | +15.6% |
The Sep 30, 2026 filing window is still open, so its bar carries the Jun 30, 2026 positions of filers that have not filed yet.
How the mix is measured
Shares are 13F common shares restated to today's split basis; options and principal amounts are left out. The change compares only filers with a 13F in both quarters and keeps each filer in its bucket of the later quarter on both sides; a filer that continues under a new CIK is compared through its successor. Holder type comes from each filer's current regulatory profile; client base and private funds come from the Form ADV roster current at each quarter end (rosters from December 2019, so an earlier quarter reads Unknown). Style, turnover, horizon and book size are measured from each filer's 13F book in the newest measured quarter, and Not measured means none was. Actively managed books are those measured systematic-like, concentrated or diversified active.
Excluded 1 holder with no observed 2026-03-31 13F and 1 holder with no observed 2026-06-30 13F.
Conviction and Crowding
160 13F filers, quarter ended Jun 30, 2026Measured across every 13F filer's common-share book once the quarter's filing window closed. Crowding counts filers with high turnover or that advise private funds on Form ADV.
Managers in the top fifth by current three-year FundScore alpha were net buyers of $0 (0 buying, 0 selling).
Estimated Holder Cost Basis
Quarter ended Jun 30, 2026, on that quarter's share basisEstimated, never filed: each 13F buy is costed at its quarter's average traded price and each sale keeps the average cost, so this is what holders paid on average if they traded evenly through each quarter.
Estimated cost covers 14.8% of the 13F shares; positions already held when a filer's 13F history starts, or bought in a quarter without a trusted average price, have no estimate.
Shareholder Targets
13F filers that own its peers but not RBBN, quarter ended Jun 30, 2026Found through its holder-overlap peers: PFE, JNJ, IBM, XOM, AAPL, MSFT, GOOGL. 6,847 filers in all.
| # | Filer | In peers | Largest peers |
|---|---|---|---|
| 1 | NORGES BANK Non-US, Index-like | $169,128,057,248 7 held | GOOGL, AAPL, MSFT |
| 2 | Berkshire Hathaway Inc Insurer, Concentrated | $103,714,385,303 2 held | AAPL, GOOGL |
| 3 | Capital Research Global Investors Adviser, Diversified active | $98,517,104,682 5 held | GOOGL, MSFT, AAPL |
| 4 | Capital World Investors Adviser, Diversified active | $87,283,918,597 7 held | GOOGL, MSFT, AAPL |
| 5 | WELLINGTON MANAGEMENT GROUP LLP Holding company, Diversified active | $67,469,674,450 7 held | GOOGL, MSFT, AAPL |
| 6 | Amundi Holding company, Index-like | $65,871,743,034 7 held | AAPL, GOOGL, MSFT |
| 7 | Capital International Investors Adviser, Diversified active | $57,684,368,007 5 held | GOOGL, MSFT, AAPL |
| 8 | Fisher Asset Management, LLC Adviser, Diversified active | $51,800,119,099 7 held | AAPL, GOOGL, MSFT |
| 9 | Swiss National Bank Unknown, Index-like | $34,336,667,761 7 held | AAPL, GOOGL, MSFT |
| 10 | MASSACHUSETTS FINANCIAL SERVICES CO /MA/ Registered adviser, Diversified active | $33,315,862,770 6 held | GOOGL, AAPL, MSFT |
Fund Ownership of RBBN by Fund Type
Registered funds' Form N-PORT reports for the quarter ended Jun 30, 2026Index funds and index ETFs hold 8.36% of shares outstanding.
| Fund type | Of shares outstanding | Shares |
|---|---|---|
| Index funds | 1.81% | 3,236,382 |
| Index ETFs | 6.55% | 11,715,972 |
| Active ETFs | 1.63% | 2,912,578 |
| Active funds | 7.11% | 12,706,553 |
| Unclassified | 0.79% | 1,409,501 |
| All registered funds | 17.88% | 31,980,986 |
How fund types are measured
Each fund series counts once, with its latest Form N-PORT report dated inside the quarter; only long share positions count, restated to today's split basis. The fund type is the series' latest Form N-CEN answer on or before the quarter end (the index-fund box and the exchange-traded flag), never its name. Unclassified funds have no usable N-CEN; unit investment trusts are among them, so index ownership is a floor. Funds sit inside their advisers' 13F reports, so these shares overlap the 13F figures and are never added to them.
| Holder | Value (USD) | % of 13F | Shares | Type | Filed | Open |
|---|---|---|---|---|---|---|
| Mega JPMORGAN CHASE & CO Bank | $121,780,468 | 40.51% | 52,042,936 | Shares | 2026-08-12 | |
| Mega NEUBERGER BERMAN GROUP LLC Holding company | $42,847,910 | 14.25% | 18,311,073 | Shares | 2026-08-13 | |
| Mega BlackRock, Inc. Holding company | $16,723,015 | 5.56% | 7,146,590 | Shares | 2026-08-07 | |
| Mega DIMENSIONAL FUND ADVISORS LP Registered adviser | $14,709,995 | 4.89% | 6,286,323 | Shares | 2026-08-11 | |
| Large ROYCE & ASSOCIATES LP Registered adviser | $11,912,769 | 3.96% | 5,090,927 | Shares | 2026-08-14 | |
| Mega VANGUARD CAPITAL MANAGEMENT LLC Registered adviser | $9,185,964 | 3.06% | 3,925,626 | Shares | 2026-08-13 | |
| Mega VANGUARD PORTFOLIO MANAGEMENT LLC Registered adviser | $8,220,576 | 2.73% | 3,513,067 | Shares | 2026-08-13 | |
| Mid PARADIGM CAPITAL MANAGEMENT INC/NY Registered adviser | $7,105,171 | 2.36% | 3,036,398 | Shares | 2026-08-13 | |
| Mega GEODE CAPITAL MANAGEMENT, LLC Registered adviser | $5,815,049 | 1.93% | 2,485,064 | Shares | 2026-08-12 | |
| Large Connor, Clark & Lunn Investment Management Ltd. Registered adviser | $5,178,733 | 1.72% | 2,213,134 | Shares | 2026-08-13 | |
| Mega STATE STREET CORP Bank | $4,516,558 | 1.50% | 1,930,153 | Shares | 2026-09-22 | |
| Mega D. E. Shaw & Co., Inc. | $4,189,477 | 1.39% | 1,790,375 | Shares | 2026-08-14 | |
| Large ACADIAN ASSET MANAGEMENT LLC | $4,137,651 | 1.38% | 1,768,227 | Shares | 2026-08-13 | |
| Mega AQR CAPITAL MANAGEMENT LLC Registered adviser | $3,298,917 | 1.10% | 1,409,795 | Shares | 2026-08-14 | |
| Small FIRST WILSHIRE SECURITIES MANAGEMENT INC Registered adviser | $3,286,513 | 1.09% | 1,404,493 | Shares | 2026-08-14 | |
| Mega CITADEL ADVISORS LLC Registered adviser | $2,904,407 | 0.97% | 1,241,200 | Shares | 2026-09-02 | |
| Mega ARROWSTREET CAPITAL, LIMITED PARTNERSHIP Registered adviser | $2,843,638 | 0.95% | 1,215,230 | Shares | 2026-08-13 | |
| Mega MARSHALL WACE, LLP Exempt adviser | $1,905,068 | 0.63% | 814,132 | Shares | 2026-08-13 | |
| Mega CHARLES SCHWAB INVESTMENT MANAGEMENT INC Registered adviser | $1,872,372 | 0.62% | 800,159 | Shares | 2026-08-14 | |
| Mega NORTHERN TRUST CORP Bank | $1,754,585 | 0.58% | 749,823 | Shares | 2026-08-13 | |
| Mega MILLENNIUM MANAGEMENT LLC Registered adviser | $1,634,391 | 0.54% | 698,458 | Shares | 2026-08-14 | |
| Mega VANGUARD FIDUCIARY TRUST CO | $1,433,888 | 0.48% | 612,773 | Shares | 2026-08-13 | |
| Large JACOBS LEVY EQUITY MANAGEMENT, INC Registered adviser | $1,362,097 | 0.45% | 582,093 | Shares | 2026-08-14 | |
| Mega VICTORY CAPITAL MANAGEMENT INC Registered adviser | $1,068,025 | 0.36% | 456,421 | Shares | 2026-08-07 | |
| Mega GOLDMAN SACHS GROUP INC Holding company | $972,104 | 0.32% | 415,430 | Shares | 2026-08-14 | |
| Mega Russell Investments Group, Ltd. | $901,425 | 0.30% | 385,226 | Shares | 2026-08-06 | |
| Mega Bank of New York Mellon Corp Bank | $888,731 | 0.30% | 379,800 | Shares | 2026-08-06 | |
| Mega MORGAN STANLEY Holding company | $888,705 | 0.30% | 379,790 | Shares | 2026-08-13 | |
| Mid XTX Topco Ltd | $756,538 | 0.25% | 323,307 | Shares | 2026-08-14 | |
| Small Silverberg Bernstein Capital Management LLC Registered adviser | $725,512 | 0.24% | 412,223 | Shares | 2026-10-13 | |
| Large BNP PARIBAS ASSET MANAGEMENT Holding S.A. Non-US | $710,421 | 0.24% | 303,599 | Shares | 2026-08-13 | |
| Small Pacific Ridge Capital Partners, LLC Registered adviser | $669,738 | 0.22% | 286,213 | Shares | 2026-08-12 | |
| Large COMMONWEALTH EQUITY SERVICES, LLC Registered adviser | $666,251 | 0.22% | 284,723 | Shares | 2026-07-29 | |
| Mega VOYA INVESTMENT MANAGEMENT LLC Registered adviser | $502,816 | 0.17% | 214,879 | Shares | 2026-08-12 | |
| Mega AMERICAN CENTURY COMPANIES INC | $493,917 | 0.16% | 211,076 | Shares | 2026-08-12 | |
| Large Squarepoint Ops LLC Registered adviser | $447,880 | 0.15% | 191,402 | Shares | 2026-08-14 | |
| Mega BANK OF AMERICA CORP /DE/ Bank | $440,942 | 0.15% | 188,437 | Shares | 2026-08-14 | |
| Mega Nuveen, LLC | $414,650 | 0.14% | 177,201 | Shares | 2026-08-11 | |
| Mid GSA CAPITAL PARTNERS LLP Registered adviser | $407,262 | 0.14% | 174,044 | Shares | 2026-08-06 | |
| Small EntryPoint Capital, LLC Registered adviser | $404,539 | 0.13% | 172,880 | Shares | 2026-08-13 | |
| Large ExodusPoint Capital Management, LP Registered adviser | $403,919 | 0.13% | 172,615 | Shares | 2026-08-14 | |
| Mega UBS Group AG Bank | $386,970 | 0.13% | 165,372 | Shares | 2026-08-13 | |
| Mega Invesco Ltd. Adviser | $380,644 | 0.13% | 162,669 | Shares | 2026-08-14 | |
| Mid WINTON GROUP Ltd | $349,605 | 0.12% | 149,404 | Shares | 2026-08-07 | |
| Mega UBS Group AG Bank | $331,110 | 0.11% | 141,500 | Call | 2026-08-13 | |
| Mega ALLIANCEBERNSTEIN L.P. Registered adviser | $323,324 | 0.11% | 138,173 | Shares | 2026-08-14 | |
| Mega Qube Research & Technologies Ltd Exempt adviser | $322,683 | 0.11% | 137,899 | Shares | 2026-08-14 | |
| Large LSV ASSET MANAGEMENT Registered adviser | $317,772 | 0.11% | 135,800 | Shares | 2026-08-06 | |
| Mega Vanguard Global Advisers, LLC Registered adviser | $295,443 | 0.10% | 126,258 | Shares | 2026-08-13 | |
| Mega RHUMBLINE ADVISERS Registered adviser | $295,275 | 0.10% | 126,186 | Shares | 2026-08-12 | |
| Small Dynamic Technology Lab Private Ltd | $245,377 | 0.08% | 104,862 | Shares | 2026-08-13 | |
| Mega AMERIPRISE FINANCIAL INC Adviser | $241,924 | 0.08% | 103,387 | Shares | 2026-08-14 | |
| Mega TWO SIGMA INVESTMENTS, LP Registered adviser | $239,117 | 0.08% | 102,187 | Shares | 2026-08-14 | |
| Mega Creative Planning Registered adviser | $235,464 | 0.08% | 100,626 | Shares | 2026-08-13 | |
| Mega BARCLAYS PLC Bank | $221,127 | 0.07% | 94,499 | Shares | 2026-08-14 | |
| Large Empowered Funds, LLC Registered adviser | $220,938 | 0.07% | 94,418 | Shares | 2026-08-17 | |
| Mid BRIDGEWAY CAPITAL MANAGEMENT, LLC Registered adviser | $220,938 | 0.07% | 94,418 | Shares | 2026-08-14 | |
| Mega FRANKLIN RESOURCES INC Adviser | $216,561 | 0.07% | 92,548 | Shares | 2026-08-13 | |
| Mid Hillsdale Investment Management Inc. Registered adviser | $212,970 | 0.07% | 91,013 | Shares | 2026-08-12 | |
| Mega CITIGROUP INC Bank | $205,701 | 0.07% | 87,907 | Shares | 2026-08-03 | |
| Mega PRICE T ROWE ASSOCIATES INC /MD/ Registered adviser | $200,640 | 0.07% | 85,744 | Shares | 2026-08-14 | |
| Large PRUDENTIAL FINANCIAL INC Insurer | $194,074 | 0.06% | 82,938 | Shares | 2026-08-12 | |
| Mega DEUTSCHE BANK AG\ Non-US | $191,727 | 0.06% | 81,935 | Shares | 2026-08-07 | |
| Mega WELLS FARGO & COMPANY/MN Bank | $190,727 | 0.06% | 81,508 | Shares | 2026-08-14 | |
| Mega SEI INVESTMENTS CO Holding company | $183,334 | 0.06% | 78,348 | Shares | 2026-08-14 | |
| Mid SIMPLEX TRADING, LLC | $172,867 | 0.06% | 73,875 | Shares | 2026-08-12 | |
| Mid INDEPENDENT FINANCIAL GROUP, LLC Registered adviser | $163,975 | 0.05% | 93,168 | Shares | 2026-10-13 | |
| Small HighMark Wealth Management LLC Registered adviser | $161,460 | 0.05% | 69,000 | Shares | 2026-08-12 | |
| Large PUBLIC EMPLOYEES RETIREMENT SYSTEM OF OHIO Benefit plan | $141,909 | 0.05% | 60,645 | Shares | 2026-08-17 | |
| Mid Virtu Financial LLC | $135,486 | 0.05% | 57,900 | Shares | 2026-08-13 | |
| Large MetLife Investment Management, LLC Registered adviser | $124,050 | 0.04% | 53,013 | Shares | 2026-08-14 | |
| Mid PRELUDE CAPITAL MANAGEMENT, LLC Registered adviser | $122,002 | 0.04% | 52,138 | Shares | 2026-08-14 | |
| Large Vident Advisory, LLC Registered adviser | $117,449 | 0.04% | 50,192 | Shares | 2026-08-12 | |
| Mega SUSQUEHANNA INTERNATIONAL GROUP, LLP | $110,389 | 0.04% | 47,175 | Shares | 2026-08-14 | |
| Small SEVEN MILE ADVISORY Registered adviser | $110,045 | 0.04% | 62,526 | Shares | 2026-10-22 | |
| Mid SUSQUEHANNA FUNDAMENTAL INVESTMENTS, LLC | $109,186 | 0.04% | 46,661 | Shares | 2026-08-14 | |
| Large Mariner, LLC Registered adviser | $101,387 | 0.03% | 43,328 | Shares | 2026-08-13 | |
| Large MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. | $101,013 | 0.03% | 43,168 | Shares | 2026-08-14 | |
| Large STATE BOARD OF ADMINISTRATION OF FLORIDA RETIREMENT SYSTEM Benefit plan | $87,850 | 0.03% | 37,543 | Shares | 2026-08-10 | |
| Micro Worth Venture Partners, LLC Registered adviser | $81,900 | 0.03% | 35,000 | Shares | 2026-08-10 | |
| Mega SG Americas Securities, LLC Non-US | $81,427 | 0.03% | 34,798 | Shares | 2026-08-07 | |
| Large Focus Partners Wealth Registered adviser | $76,578 | 0.03% | 32,726 | Shares | 2026-08-12 | |
| Large Assenagon Asset Management S.A. | $66,751 | 0.02% | 37,927 | Shares | 2026-10-15 | |
| Small Polymer Capital Management (US) LLC | $66,350 | 0.02% | 28,355 | Shares | 2026-08-14 | |
| Mega CITADEL ADVISORS LLC Registered adviser | $64,818 | 0.02% | 27,700 | Call | 2026-09-02 | |
| Mega ENVESTNET ASSET MANAGEMENT INC Registered adviser | $64,801 | 0.02% | 27,693 | Shares | 2026-09-23 | |
| Mega HSBC HOLDINGS PLC | $63,158 | 0.02% | 26,991 | Shares | 2026-08-14 | |
| Large Brevan Howard Capital Management LP Exempt adviser | $61,200 | 0.02% | 26,154 | Shares | 2026-08-14 | |
| Small Abacus Wealth Partners, LLC Registered adviser | $61,052 | 0.02% | 26,091 | Shares | 2026-07-22 | |
| Mega MANUFACTURERS LIFE INSURANCE COMPANY, THE Non-US | $59,826 | 0.02% | 25,567 | Shares | 2026-09-09 | |
| Mid Essex Financial Services, Inc. Registered adviser | $58,055 | 0.02% | 24,810 | Shares | 2026-08-10 | |
| Large Police & Firemen's Retirement System of New Jersey | $57,779 | 0.02% | 24,692 | Shares | 2026-07-23 | |
| Mid Susquehanna Portfolio Strategies, LLC | $56,953 | 0.02% | 24,339 | Shares | 2026-08-14 | |
| Mid Global Retirement Partners, LLC | $56,864 | 0.02% | 24,301 | Shares | 2026-08-06 | |
| Large NEW YORK STATE COMMON RETIREMENT FUND | $52,764 | 0.02% | 22,549 | Shares | 2026-07-29 | |
| Mega JONES FINANCIAL COMPANIES LLLP | $52,612 | 0.02% | 22,484 | Shares | 2026-08-14 | |
| Large MACKENZIE FINANCIAL CORP Registered adviser | $52,327 | 0.02% | 22,362 | Shares | 2026-08-13 | |
| Mega JANE STREET GROUP, LLC | $51,201 | 0.02% | 21,881 | Shares | 2026-08-14 | |
| Mid State of Alaska, Department of Revenue | $48,902 | 0.02% | 27,786 | Shares | 2026-10-15 | |
| Large INTECH INVESTMENT MANAGEMENT LLC Registered adviser | $48,531 | 0.02% | 20,740 | Shares | 2026-08-10 |
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