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RBBN

Ribbon Communications Inc.

Company with tickers: RBBN

CIK
1708055
CUSIP
762544104
Shares Outstanding
176,139,067
13F Activity (30d)
122 filings 119 filers
Holders: 149
Total Value: $274,409,880
Total Shares: 129,438,670
Showing 1–100 of 152 holdings by value · page 1 of 2

Institutional Ownership Trend

25 quarters

Holder Concentration

Across 149 13F filers · Δ vs Dec 31, 2025
Top Holder
40.2%
Jun 2023 → Mar 2026 · range 38.8% – 41.5%
+0.1 pts
Top 5
69.9%
Jun 2023 → Mar 2026 · range 68.9% – 76.5%
−1.9 pts
Top 10
83.0%
Jun 2023 → Mar 2026 · range 81.7% – 87.7%
−2.3 pts
HHI
1,935
Jun 2023 → Mar 2026 · range 1,862 – 2,118
Moderately concentrated −17

Quarterly Activity

vs Dec 31, 2025
New
35
Increased
52
Decreased
43
Sold Out
41
Unchanged
19
Holder count: -6
Institutional value: -26.6%
Shares held: -0.3%

Top Buyers

vs Dec 31, 2025
Institution Added Now Holds Open
Mega AQR CAPITAL MANAGEMENT LLC +765,876 1,257,347
Large ACADIAN ASSET MANAGEMENT LLC +677,325 1,438,490
Large MARSHALL WACE, LLP +596,085 769,787
Mega D. E. Shaw & Co., Inc. +558,631 1,538,472
Mega CITADEL ADVISORS LLC +538,886 592,789

Top Sellers

vs Dec 31, 2025
Institution Sold Now Holds Open
Mega BlackRock, Inc. −941,918 6,724,007
Small HERALD INVESTMENT MANAGEMENT Ltd −700,000 100,000
Mid PARADIGM CAPITAL MANAGEMENT INC/NY −286,963 8,036,335
Mega NORTHERN TRUST CORP −216,696 705,858
Mega UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC −211,077 1,547

Top New Positions

vs Dec 31, 2025
Institution Acquired Value (USD) Open
Mega VANGUARD CAPITAL MANAGEMENT LLC 4,216,459 $8,938,893
Mega VANGUARD PORTFOLIO MANAGEMENT LLC 3,335,665 $7,071,609
Mega VANGUARD FIDUCIARY TRUST CO 587,429 $1,245,349
Mid OP Asset Management Ltd 206,802 $438,420
Mega Vanguard Global Advisers, LLC 126,258 $267,666

Top Sold-Out Positions

vs Dec 31, 2025
Institution Previously Held Last Value (USD) Open
Mega VANGUARD GROUP INC 7,833,009 $22,559,063
Large First Eagle Investment Management, LLC 862,528 $2,484,080
Mid KENNEDY CAPITAL MANAGEMENT LLC 710,703 $2,046,824
Mega JANE STREET GROUP, LLC 379,465 $1,092,858
Large STATE OF WISCONSIN INVESTMENT BOARD 310,366 $893,854
Filter: New 35 Increased 52 Reduced 43 Sold out 41 Unchanged 19
100 of 100 shown
All Common Calls Puts
Export CSV
Holder Value (USD) % of 13F Shares Open
Mega JPMORGAN CHASE & CO $110,331,235 40.21% 52,043,036
Mega NEUBERGER BERMAN GROUP LLC $36,807,413 13.41% 17,361,988
Mid PARADIGM CAPITAL MANAGEMENT INC/NY $17,037,029 6.21% 8,036,335
Mega BlackRock, Inc. $14,254,890 5.19% 6,724,007
Mega DIMENSIONAL FUND ADVISORS LP $13,464,351 4.91% 6,351,110
Mid ROYCE & ASSOCIATES LP $10,345,050 3.77% 4,879,741
Mega VANGUARD CAPITAL MANAGEMENT LLC $8,938,893 3.26% 4,216,459
Mega VANGUARD PORTFOLIO MANAGEMENT LLC $7,071,609 2.58% 3,335,665
Mega GEODE CAPITAL MANAGEMENT, LLC $5,118,867 1.87% 2,414,560
Large Connor, Clark & Lunn Investment Management Ltd. $4,430,210 1.61% 2,089,722
Mega STATE STREET CORP $4,049,257 1.48% 1,910,027
Mega D. E. Shaw & Co., Inc. $3,261,560 1.19% 1,538,472
Large ACADIAN ASSET MANAGEMENT LLC $3,049,598 1.11% 1,438,490
Small FIRST WILSHIRE SECURITIES MANAGEMENT INC Broker-Dealer $2,983,217 1.09% 1,407,178
Mega AQR CAPITAL MANAGEMENT LLC $2,665,572 0.97% 1,257,347
Mega ARROWSTREET CAPITAL, LIMITED PARTNERSHIP $2,579,777 0.94% 1,216,876
Large MARSHALL WACE, LLP $1,631,947 0.59% 769,787
Mega GOLDMAN SACHS GROUP INC $1,578,858 0.58% 744,745
Mega CHARLES SCHWAB INVESTMENT MANAGEMENT INC $1,501,305 0.55% 708,163
Mega NORTHERN TRUST CORP Bank $1,496,418 0.55% 705,858
Large JACOBS LEVY EQUITY MANAGEMENT, INC $1,452,857 0.53% 685,310
Mega VANGUARD FIDUCIARY TRUST CO Bank $1,245,349 0.45% 587,429
Mega CITADEL ADVISORS LLC $1,218,976 0.44% 574,989
Mega MILLENNIUM MANAGEMENT LLC $1,041,598 0.38% 491,320
Small Silverberg Bernstein Capital Management LLC $928,820 0.34% 438,123
Mega MORGAN STANLEY $897,743 0.33% 423,465
Mega VICTORY CAPITAL MANAGEMENT INC $895,384 0.33% 422,351
Mega Bank of New York Mellon Corp Bank $800,011 0.29% 377,364
Large Russell Investments Group, Ltd. $745,968 0.27% 351,873
Mid GSA CAPITAL PARTNERS LLP $620,642 0.23% 292,756
Large COMMONWEALTH EQUITY SERVICES, LLC $603,612 0.22% 284,723
Small Pacific Ridge Capital Partners, LLC $521,893 0.19% 246,176
Mega AMERICAN CENTURY COMPANIES INC $450,209 0.16% 212,363
Mega BANK OF AMERICA CORP /DE/ Bank $441,447 0.16% 208,230
Large VOYA INVESTMENT MANAGEMENT LLC $440,321 0.16% 207,699
Mid OP Asset Management Ltd $438,420 0.16% 206,802
Large ExodusPoint Capital Management, LP $417,444 0.15% 196,908
Mega UBS Group AG $408,841 0.15% 192,850
Mega Invesco Ltd. $385,505 0.14% 181,843
Mega Nuveen, LLC $375,665 0.14% 177,201
Mid XTX Topco Ltd $341,197 0.12% 160,942
Mega UBS Group AG $300,192 0.11% 141,600
Small EntryPoint Capital, LLC $297,444 0.11% 140,304
Mid Engineers Gate Manager LP $296,719 0.11% 139,962
Large LSV ASSET MANAGEMENT $287,896 0.10% 135,800
Mega RHUMBLINE ADVISERS $272,218 0.10% 128,405
Mega Vanguard Global Advisers, LLC $267,666 0.10% 126,258
Mega ALLIANCEBERNSTEIN L.P. $254,715 0.09% 120,149
Mega FRANKLIN RESOURCES INC $230,588 0.08% 108,769
Mega AMERIPRISE FINANCIAL INC $227,866 0.08% 107,484
Mega BARCLAYS PLC $215,884 0.08% 101,833
Small HERALD INVESTMENT MANAGEMENT Ltd $212,000 0.08% 100,000
Mid Susquehanna Portfolio Strategies, LLC $197,562 0.07% 93,190
Mid BRIDGEWAY CAPITAL MANAGEMENT, LLC $187,049 0.07% 88,231
Large Empowered Funds, LLC $187,049 0.07% 88,231
Large SEI INVESTMENTS CO $173,216 0.06% 81,706
Mega PRICE T ROWE ASSOCIATES INC /MD/ $148,022 0.05% 69,822
Large Creative Planning $137,571 0.05% 64,892
Large PUBLIC EMPLOYEES RETIREMENT SYSTEM OF OHIO Pension $128,567 0.05% 60,645
Small Dynamic Technology Lab Private Ltd $126,129 0.05% 59,495
Small State of Wyoming $116,457 0.04% 54,933
Mid SUSQUEHANNA FUNDAMENTAL INVESTMENTS, LLC $115,618 0.04% 54,537
Mega SUSQUEHANNA INTERNATIONAL GROUP, LLP $110,729 0.04% 52,231
Large Vident Advisory, LLC $106,407 0.04% 50,192
Mid WINTON GROUP Ltd $106,243 0.04% 50,115
Mid PRELUDE CAPITAL MANAGEMENT, LLC $103,960 0.04% 49,038
Large MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. Mutual Fund $94,664 0.03% 44,653
Large MetLife Investment Management, LLC $83,655 0.03% 39,460
Large Assenagon Asset Management S.A. $80,405 0.03% 37,927
Large STATE BOARD OF ADMINISTRATION OF FLORIDA RETIREMENT SYSTEM Pension $79,591 0.03% 37,543
Mega WELLS FARGO & COMPANY/MN $79,368 0.03% 37,438
Mega CITIGROUP INC $77,520 0.03% 36,567
Large SG Americas Securities, LLC Broker-Dealer $68,181 0.02% 32,161
Small Polymer Capital Management (US) LLC $67,579 0.02% 31,877
Large Focus Partners Wealth $66,593 0.02% 31,412
Mega MANUFACTURERS LIFE INSURANCE COMPANY, THE Insurance $58,732 0.02% 27,704
Mega ENVESTNET ASSET MANAGEMENT INC $56,131 0.02% 26,477
Small Abacus Wealth Partners, LLC $55,312 0.02% 26,091
Mid Virtu Financial LLC $54,496 0.02% 25,706
Mid State of Alaska, Department of Revenue $53,826 0.02% 25,390
Mega DEUTSCHE BANK AG\ Bank $53,809 0.02% 25,382
Large Police & Firemen's Retirement System of New Jersey Pension $52,347 0.02% 24,692
Small Essex Financial Services, Inc. $52,281 0.02% 24,661
Large Mariner, LLC $48,957 0.02% 23,093
Small TWO SIGMA SECURITIES, LLC Broker-Dealer $48,683 0.02% 22,964
Mega SUSQUEHANNA INTERNATIONAL GROUP, LLP $48,124 0.02% 22,700
Large NEW YORK STATE COMMON RETIREMENT FUND Pension $47,803 0.02% 22,549
Mid INTECH INVESTMENT MANAGEMENT LLC $46,512 0.02% 21,940
Large Schonfeld Strategic Advisors LLC $46,182 0.02% 21,784
Small VISTA INVESTMENT PARTNERS LLC $43,248 0.02% 20,400
Mega BNP PARIBAS ARBITRAGE, SA $42,476 0.02% 20,036
Large JONES FINANCIAL COMPANIES LLLP $40,530 0.01% 19,118
Small IRONWOOD INVESTMENT MANAGEMENT LLC $38,299 0.01% 18,066
Mega CITADEL ADVISORS LLC $37,736 0.01% 17,800
Large STRS OHIO $37,312 0.01% 17,600
Mid Vestmark Advisory Solutions, Inc. $34,471 0.01% 16,260
Mid NewEdge Wealth, LLC $34,471 0.01% 16,260
Micro SEVEN MILE ADVISORY $33,869 0.01% 15,976
Mega LPL Financial LLC $33,074 0.01% 15,601
Small Trilogy Capital Inc. $32,563 0.01% 15,360
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