Company · Ownership research

Ribbon Communications Inc. RBBN

CIK 0001708055 · CUSIP 762544104

Insider trading Initial holdings Institutional holders

Quarter-end disclosures, not live holdings.

Several CUSIPs are reported for this company; this page shows CUSIP 762544104 (RBBN), not CUSIP 762544904 (RBBN), and does not merge CUSIPs.

This page lists the top 20 of 150 rows by value; the complete set is available through the API.

Some filings reported values in thousands; those figures were scaled ×1,000 to dollars.

Top 20 institutions

Weight means this stock's share of the manager's own portfolio.

By reported value

#	Manager	Value	Manager weight	Change vs prior	Source
01	JPMORGAN CHASE & CO CIK 19617 · Amended · View history	$107.99M 52,043,036 shares	0.01%	+5.46K(0.00%)Added	SEC filing ↗ May 13, 2026	▾
02	NEUBERGER BERMAN GROUP LLC CIK 1465109 · Amended · View history	$33.20M 17,361,988 shares	0.03%	-69.11K(-0.40%)Reduced	SEC filing ↗ Oct 27, 2026	▾
03	PARADIGM CAPITAL MANAGEMENT INC/NY CIK 1037792 · View history	$17.04M 8,036,335 shares	0.65%	-286.96K(-3.40%)Reduced	SEC filing ↗ May 14, 2026	▾
04	BlackRock, Inc. CIK 2012383 · View history	$14.25M 6,724,007 shares	0.00%	-941.92K(-12.30%)Reduced	SEC filing ↗ May 13, 2026	▾
05	DIMENSIONAL FUND ADVISORS LP CIK 354204 · View history	$13.46M 6,351,110 shares	0.00%	-124.02K(-1.90%)Reduced	SEC filing ↗ May 7, 2026	▾
06	ROYCE & ASSOCIATES LP CIK 906304 · View history	$10.35M 4,879,741 shares	0.10%	+265.00K(+5.70%)Added	SEC filing ↗ May 12, 2026	▾
07	VANGUARD CAPITAL MANAGEMENT LLC CIK 2100119 · Amended · View history	$8.94M 4,216,459 shares	0.00%	—	SEC filing ↗ May 15, 2026	▾
08	VANGUARD PORTFOLIO MANAGEMENT LLC CIK 2100121 · Amended · View history	$7.07M 3,335,665 shares	0.00%	—	SEC filing ↗ May 8, 2026	▾
09	GEODE CAPITAL MANAGEMENT, LLC CIK 1214717 · View history	$5.12M 2,414,560 shares	0.00%	+111.99K(+4.90%)Added	SEC filing ↗ May 15, 2026	▾
10	Connor, Clark & Lunn Investment Management Ltd. CIK 1596800 · View history	$4.43M 2,089,722 shares	0.01%	+93.88K(+4.70%)Added	SEC filing ↗ May 11, 2026	▾
11	STATE STREET CORP CIK 93751 · View history	$4.05M 1,910,027 shares	0.00%	-189.77K(-9.00%)Reduced	SEC filing ↗ May 15, 2026	▾
12	D. E. Shaw & Co., Inc. CIK 1009207 · View history	$3.26M 1,538,472 shares	0.00%	+558.63K(+57.00%)Added	SEC filing ↗ May 15, 2026	▾
13	ACADIAN ASSET MANAGEMENT LLC CIK 916542 · View history	$3.04M 1,438,490 shares	0.00%	+677.33K(+89.00%)Added	SEC filing ↗ May 13, 2026	▾
14	FIRST WILSHIRE SECURITIES MANAGEMENT INC CIK 732847 · View history	$2.98M 1,407,178 shares	0.67%	+139.59K(+11.00%)Added	SEC filing ↗ May 12, 2026	▾
15	AQR CAPITAL MANAGEMENT LLC CIK 1167557 · View history	$2.67M 1,257,347 shares	0.00%	+765.88K(+155.80%)Added	SEC filing ↗ May 15, 2026	▾
16	ARROWSTREET CAPITAL, LIMITED PARTNERSHIP CIK 1164508 · View history	$2.58M 1,216,876 shares	0.00%	+187.16K(+18.20%)Added	SEC filing ↗ May 14, 2026	▾
17	MARSHALL WACE, LLP CIK 1318757 · View history	$1.63M 769,787 shares	0.00%	+596.09K(+343.20%)Added	SEC filing ↗ May 15, 2026	▾
18	GOLDMAN SACHS GROUP INC CIK 886982 · View history	$1.58M 744,745 shares	0.00%	-42.75K(-5.40%)Reduced	SEC filing ↗ May 15, 2026	▾
19	CHARLES SCHWAB INVESTMENT MANAGEMENT INC CIK 884546 · View history	$1.50M 708,163 shares	0.00%	-60.91K(-7.90%)Reduced	SEC filing ↗ May 15, 2026	▾
20	NORTHERN TRUST CORP CIK 73124 · View history	$1.50M 705,858 shares	0.00%	-216.70K(-23.50%)Reduced	SEC filing ↗ May 14, 2026	▾

Showing 20 / 150 institutions. The complete set is available through the API.

Coverage & totals by quarter

Reporting institutions

150

Cancelled or null records excluded

Disclosed shares

129,256,572

Not deduplicated across managers

Disclosed value

$268.16M

Not market cap or free float

Reporting institutions by quarter

Counts also change with data coverage and reporting entities; they do not measure net buying. Distinct managers with a live stock row in this CUSIP; totals may include overlapping filings and are not a share of the company.

Ribbon Communications Inc. · Q1 2026

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Sources, coverage & how to read this data

Figures are as reported to the SEC and merged with later amendments where Akkru could match them. Preview limits apply to what is listed, not to the totals, which come from the complete reported data. Nothing is zero-filled: a missing quarter or month is shown as missing.