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Disclosery

RBBN RIBBON COMMUNICATIONS INC

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COMMON STOCK (common), issuer CIK 1708055

144 managers (150 13F filers) reported a position in RBBN shares at 2026-03-31, 129,256,572 shares in all. 33 filers opened a position and 35 filers sold out during the quarter.

Managers
144
13F filers
150
New
33
Added
51
Reduced
43
Sold out
35
Shares held by filers
129,256,572

Shares held by filers adds up every 13F filer's report, so a share reported by a parent and by its subsidiary counts twice (H9). Managers counts each filer group once.

13D and 13G filers

No 13D or 13G on this security in the data. Structured 13D/G data starts 2024-12-18.

Insider trades

No Form 4 transaction on this security in the data.

13F holders, Q1 2026

Filers in the available 13F reports with a share position at 2026-03-31, filer groups collapsed to one row (method), largest first. Options and principal amounts are left out. A group row states no % of portfolio, since each member reports its own portfolio: the members' percents are listed under it. A value about 1,000 times or 1/1,000 of the price other filers imply is shown as filed but neither ranks the row nor enters a sum.

HolderSharesValue% of portfolioChangeSource
JPMORGAN CHASE & COin group JPMORGAN CHASE & CO52,043,036$108M0.01%+5,45913F-HR/ATimelineGroup
NEUBERGER BERMAN GROUP LLCin group NEUBERGER BERMAN GROUP LLC17,361,988$33.2M0.03%-69,11413F-HRTimelineGroup
VANGUARD GROUP INCgroup of 4 filers holding8,265,811$17.5MnewTimeline
PARADIGM CAPITAL MANAGEMENT INC/NY8,036,335$17M0.65%-286,96313F-HRTimeline
BlackRock, Inc.in group BlackRock, Inc.6,724,007$14.3M<0.01%-941,91813F-HRTimelineGroup
DIMENSIONAL FUND ADVISORS LPin group DIMENSIONAL FUND ADVISORS LP6,351,110$13.5M<0.01%-124,01513F-HRTimelineGroup
ROYCE & ASSOCIATES LP4,879,741$10.3M0.1%+265,00013F-HRTimeline
GEODE CAPITAL MANAGEMENT, LLCin group GEODE CAPITAL MANAGEMENT, LLC2,414,560$5.12M<0.01%+111,98713F-HRTimelineGroup
Connor, Clark & Lunn Investment Managem…2,089,722$4.43M0.01%+93,87713F-HRTimeline
STATE STREET CORPin group STATE STREET CORP1,910,027$4.05M<0.01%-189,76613F-HRTimelineGroup
D. E. Shaw & Co., Inc.in group D. E. Shaw & Co., Inc.1,538,472$3.26M<0.01%+558,63113F-HRTimelineGroup
ACADIAN ASSET MANAGEMENT LLCin group ACADIAN ASSET MANAGEMENT LLC1,438,490$3.04M<0.01%+677,32513F-HRTimelineGroup
FIRST WILSHIRE SECURITIES MANAGEMENT INC1,407,178$2.98M0.67%+139,59213F-HRTimeline
AQR CAPITAL MANAGEMENT LLCin group AQR CAPITAL MANAGEMENT LLC1,257,347$2.67M<0.01%+765,87613F-HRTimelineGroup
ARROWSTREET CAPITAL, LIMITED PARTNERSHIPin group ARROWSTREET CAPITAL, LIMITED …1,216,876$2.58M<0.01%+187,16013F-HRTimelineGroup
MARSHALL WACE, LLPin group MARSHALL WACE, LLP769,787$1.63M<0.01%+596,08513F-HRTimelineGroup
GOLDMAN SACHS GROUP INCin group GOLDMAN SACHS GROUP INC744,745$1.58M<0.01%-42,74813F-HRTimelineGroup
CHARLES SCHWAB INVESTMENT MANAGEMENT INCin group Charles Schwab Trust Co708,163$1.5M<0.01%-60,91113F-HRTimelineGroup
NORTHERN TRUST CORPin group NORTHERN TRUST CORP705,858$1.5M<0.01%-216,69613F-HRTimelineGroup
JACOBS LEVY EQUITY MANAGEMENT, INC685,310$1.45M0.01%-204,85813F-HRTimeline
CITADEL ADVISORS LLCin group CITADEL ADVISORS LLC574,989$1.22M<0.01%+521,08613F-HRTimelineGroup
MILLENNIUM MANAGEMENT LLCin group MILLENNIUM MANAGEMENT LLC491,320$1.04M<0.01%+437,01413F-HRTimelineGroup
Silverberg Bernstein Capital Management…438,123$929K0.51%+2,10013F-HRTimeline
MORGAN STANLEYin group MORGAN STANLEY423,465$898K<0.01%+31,07413F-HRTimelineGroup
VICTORY CAPITAL MANAGEMENT INC422,351$895K<0.01%+72,80813F-HRTimeline
Bank of New York Mellon Corpin group Bank of New York Mellon Corp377,364$800K<0.01%-12,63013F-HRTimelineGroup
Russell Investments Group, Ltd.in group Russell Investments Group, Lt…351,873$746K<0.01%+264,34113F-HRTimelineGroup
GSA CAPITAL PARTNERS LLP292,756$621K0.04%+5,17313F-HRTimeline
COMMONWEALTH EQUITY SERVICES, LLC284,723$604K<0.01%-2113F-HRTimeline
Pacific Ridge Capital Partners, LLC246,176$522K0.11%+4713F-HRTimeline
AMERICAN CENTURY COMPANIES INCin group AMERICAN CENTURY COMPANIES INC212,363$450K<0.01%-1,58313F-HRTimelineGroup
BANK OF AMERICA CORP /DE/in group BANK OF AMERICA CORP /DE/208,230$441K<0.01%+60,54113F-HRTimelineGroup
VOYA INVESTMENT MANAGEMENT LLCin group VOYA INVESTMENT MANAGEMENT LLC207,699$440K<0.01%+58,13913F-HRTimelineGroup
OP Asset Management Ltd206,802$438K<0.01%new13F-HR/ATimeline
SUSQUEHANNA INTERNATIONAL GROUP, LLPgroup of 3 filers holding199,958$424K+35,529Timeline
ExodusPoint Capital Management, LP196,908$417K<0.01%-1,28313F-HRTimeline
UBS Group AGgroup of 2 filers holding194,397$412K-209,597Timeline
Invesco Ltd.in group Invesco Ltd.181,843$386K<0.01%+12,92813F-HRTimelineGroup
Nuveen, LLCin group TIAA177,201$376K<0.01%+96613F-HRTimelineGroup
ALLIANCEBERNSTEIN L.P.120,149$346K<0.01%+89913F-HRTimeline
XTX Topco Ltdin group XTX Topco Ltd160,942$341K0.01%+58,05713F-HRTimelineGroup
EntryPoint Capital, LLC140,304$297K0.09%+15,73113F-HRTimeline
Engineers Gate Manager LP139,962$297K<0.01%+84,48213F-HRTimeline
LSV ASSET MANAGEMENT135,800$288K<0.01%013F-HRTimeline
RHUMBLINE ADVISERS128,405$272K<0.01%+11813F-HRTimeline
FRANKLIN RESOURCES INCin group Franklin Resources108,769$231K<0.01%+37,56513F-HRTimelineGroup
AMERIPRISE FINANCIAL INCin group AMERIPRISE FINANCIAL INC107,484$228K<0.01%-21,49113F-HR/ATimelineGroup
BARCLAYS PLCin group BARCLAYS PLC101,833$216K<0.01%-100,62813F-HRTimelineGroup
HERALD INVESTMENT MANAGEMENT Ltd100,000$212K0.03%-700,00013F-HRTimeline
BRIDGEWAY CAPITAL MANAGEMENT, LLC88,231$187K<0.01%new13F-HRTimeline
Empowered Funds, LLC88,231$187K<0.01%new13F-HR/ATimeline
SEI INVESTMENTS COin group SEI INVESTMENTS CO81,706$173K<0.01%-58,34113F-HRTimelineGroup
PRICE T ROWE ASSOCIATES INC /MD/69,822$149K<0.01%013F-HRTimeline
Creative Planningin group Creative Planning64,892$138K<0.01%new13F-HRTimelineGroup
PUBLIC EMPLOYEES RETIREMENT SYSTEM OF O…60,645$129K<0.01%013F-HRTimeline
Dynamic Technology Lab Private Ltd59,495$126K0.02%-31,53113F-HRTimeline
State of Wyoming54,933$116K0.01%new13F-HRTimeline
Vident Advisory, LLCin group Vident Advisory, LLC50,192$106K<0.01%new13F-HRTimelineGroup
WINTON GROUP Ltdin group WINTON GROUP Ltd50,115$106K<0.01%+17,02013F-HRTimelineGroup
PRELUDE CAPITAL MANAGEMENT, LLC49,038$104K0.01%+8,30013F-HRTimeline
MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd.in group Mirae Asset Global Investment…44,653$94.7K<0.01%+1,07613F-HRTimelineGroup
MetLife Investment Management, LLCin group MetLife Investment Management…39,460$83.7K<0.01%+2,14113F-HRTimelineGroup
Assenagon Asset Management S.A.37,927$80.4K<0.01%-2,42813F-HRTimeline
STATE BOARD OF ADMINISTRATION OF FLORID…37,543$79.6K<0.01%013F-HRTimeline
WELLS FARGO & COMPANY/MNin group WELLS FARGO & COMPANY/MN37,438$79.4K<0.01%-73,36013F-HR/ATimelineGroup
CITIGROUP INCin group CITIGROUP INC36,567$77.5K<0.01%+3,22713F-HRTimelineGroup
SG Americas Securities, LLC32,161$68K<0.01%-9,37613F-HRTimeline
Polymer Capital Management (US) LLC31,877$67.6K0.01%new13F-HRTimeline
Focus Partners Wealthin group Focus Partners Wealth31,412$66.6K<0.01%-3,68813F-HRTimelineGroup
MANUFACTURERS LIFE INSURANCE COMPANY, T…in group MANUFACTURERS LIFE INSURANCE …27,704$58.7K<0.01%-3,58213F-HRTimelineGroup
ENVESTNET ASSET MANAGEMENT INCin group ENVESTNET ASSET MANAGEMENT INC26,477$56.1K<0.01%-23713F-HRTimelineGroup
Abacus Wealth Partners, LLC26,091$55.3K0.01%new13F-HRTimeline
Virtu Financial LLCin group Virtu Financial LLC25,706$54K<0.01%new13F-HRTimelineGroup
DEUTSCHE BANK AG\in group DEUTSCHE BANK AG\25,382$53.8K<0.01%-60,28513F-HRTimelineGroup
State of Alaska, Department of Revenue25,390$53K<0.01%013F-HRTimeline
Police & Firemen's Retirement System of…24,692$52.3K<0.01%013F-HRTimeline
Essex Financial Services, Inc.in group Essex Financial Services, Inc.24,661$52.3K<0.01%+14313F-HRTimelineGroup
Mariner, LLCin group Mariner, LLC23,093$49K<0.01%new13F-HRTimelineGroup
TWO SIGMA SECURITIES, LLC22,964$48.7K0.01%-7,78213F-HRTimeline
NEW YORK STATE COMMON RETIREMENT FUND22,549$47.8K<0.01%013F-HRTimeline
INTECH INVESTMENT MANAGEMENT LLC21,940$46.5K<0.01%-5,14713F-HRTimeline
Schonfeld Strategic Advisors LLC21,784$46.2K<0.01%new13F-HRTimeline
VISTA INVESTMENT PARTNERS LLC20,400$43.2K0.01%013F-HRTimeline
BNP PARIBAS FINANCIAL MARKETSin group BNP PARIBAS FINANCIAL MARKETS20,036$42.5K<0.01%+32813F-HRTimelineGroup
JONES FINANCIAL COMPANIES LLLPin group JONES FINANCIAL COMPANIES LLLP19,118$40.7K<0.01%+1,85013F-HRTimelineGroup
IRONWOOD INVESTMENT MANAGEMENT LLC18,066$38.3K0.02%-28413F-HRTimeline
STRS OHIO17,600$37.3K<0.01%013F-HRTimeline
Vestmark Advisory Solutions, Inc.16,260$34.5K<0.01%new13F-HRTimeline
NewEdge Wealth, LLC16,260$34.5K<0.01%new13F-HRTimeline
SEVEN MILE ADVISORY15,976$33.9K0.02%new13F-HRTimeline
LPL Financial LLC15,601$33.1K<0.01%+1,68913F-HRTimeline
Trilogy Capital Inc.15,360$32.6K<0.01%-50,00013F-HRTimeline
PRUDENTIAL FINANCIAL INCin group PRUDENTIAL FINANCIAL INC14,638$31K<0.01%new13F-HRTimelineGroup
NINE MASTS CAPITAL Ltd14,377$30.5K<0.01%new13F-HRTimeline
IEQ CAPITAL, LLC14,129$30K<0.01%new13F-HRTimeline
WEALTH ENHANCEMENT ADVISORY SERVICES, L…13,557$29.6K<0.01%new13F-HRTimeline
ProShare Advisors LLC13,597$28.8K<0.01%-3,54613F-HRTimeline
WHITE PINE CAPITAL LLC13,335$28.3K0.01%013F-HR/ATimeline
CWM, LLCin group CWM, LLC12,399$26.3K<0.01%+10,20513F-HRTimelineGroup
Y-Intercept (Hong Kong) Ltd12,356$26.2K<0.01%new13F-HRTimeline
CANADA PENSION PLAN INVESTMENT BOARD11,400$24.2K<0.01%new13F-HRTimeline
Ballentine Partners, LLC10,664$22.6K<0.01%new13F-HRTimeline
Indivisible Partners10,257$21.7K<0.01%013F-HRTimeline
GRIMES & Co WEALTH MANAGEMENT, LLC10,030$21.3K<0.01%013F-HRTimeline
Kathmere Capital Management, LLC10,000$21.2K<0.01%013F-HRTimeline
Ameritas Investment Partners, Inc.in group Ameritas Investment Partners,…8,663$18.4K<0.01%013F-HRTimelineGroup
Legal & General Group Plcin group Legal & General Group Plc8,432$17.9K<0.01%-85,91113F-HRTimelineGroup
Tower Research Capital LLC (TRC)in group Tower Research Capital LLC (T…7,558$16K<0.01%-7,22913F-HRTimelineGroup
OSAIC HOLDINGS, INC.in group OSAIC HOLDINGS, INC.7,536$16K<0.01%-4113F-HRTimelineGroup
ROYAL BANK OF CANADAin group ROYAL BANK OF CANADA5,896$12K<0.01%+2,78213F-HRTimelineGroup
FMR LLCin group FMR LLC5,221$11.1K<0.01%-8,05213F-HRTimelineGroup
CALIFORNIA STATE TEACHERS RETIREMENT SY…5,075$10.8K<0.01%-83,37713F-HRTimeline
Rockefeller Capital Management L.P.in group Rockefeller Capital Managemen…3,602$7.64K<0.01%-2,80613F-HRTimelineGroup
Allworth Financial LP3,263$6.92K<0.01%+25813F-HRTimeline
Sterling Capital Management LLC3,105$6.58K<0.01%-2,30213F-HRTimeline
FIFTH THIRD BANCORPin group FIFTH THIRD BANK, NATIONAL AS…2,049$4.34K<0.01%new13F-HRTimelineGroup
Colonial Trust Advisorsin group Colonial Trust Advisors2,000$4.24K<0.01%+1,00013F-HRTimelineGroup
Medallion Wealth Advisors, LLC1,920$4.07K<0.01%013F-HRTimeline
Farther Finance Advisors, LLC1,654$3.62K<0.01%-2,86813F-HRTimeline
BARROW HANLEY MEWHINNEY & STRAUSS LLC1,516$3.21K<0.01%new13F-HRTimeline
Community Bank, N.A.1,400$2.95K<0.01%013F-HRTimeline
Bell Investment Advisors, Inc1,307$2.77K<0.01%new13F-HRTimeline
Arax Advisory Partners673$1.43K<0.01%-4513F-HRTimeline
PNC Financial Services Group, Inc.in group PNC Financial Services Group,…643$1.36K<0.01%-42013F-HRTimelineGroup
MAI Capital Management641$1.36K<0.01%+56313F-HRTimeline
Essential Partners LLC502$1.06K<0.01%+48913F-HRTimeline
ROTHSCHILD INVESTMENT LLC438$929<0.01%+26813F-HRTimeline
SIGNATUREFD, LLC405$859<0.01%+36713F-HRTimeline
EverSource Wealth Advisors, LLCin group EverSource Wealth Advisors, L…397$842<0.01%+39513F-HR/ATimelineGroup
MassMutual Private Wealth & Trust, FSB381$808<0.01%new13F-HRTimeline
GROUP ONE TRADING LLC314$666<0.01%new13F-HRTimeline
Larson Financial Group LLC245$519<0.01%+7413F-HRTimeline
IFP Advisors, Inc231$490<0.01%+6813F-HRTimeline
Root Financial Partners, LLC164$348<0.01%new13F-HRTimeline
True Wealth Design, LLC123$261<0.01%+12013F-HRTimeline
US BANCORP \DE\in group US BANCORP \DE\90$191<0.01%-1,99513F-HRTimelineGroup
CoreCap Advisors, LLC80$170<0.01%013F-HRTimeline
Wealth Preservation Advisors, LLC50$106<0.01%new13F-HRTimeline
SBI Securities Co., Ltd.26$55<0.01%+1713F-HRTimeline
SJS Investment Consulting Inc.15$32<0.01%new13F-HRTimeline
TFC Financial Management, Inc.12$26<0.01%013F-HRTimeline
Caitong International Asset Management …3$6<0.01%new13F-HRTimeline
Basecamp Wealth Advisors LLC2$4<0.01%new13F-HRTimeline
Kilter Group LLC1$3<0.01%new13F-HRTimeline