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 48 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	DIMENSIONAL FUND ADVISORS LP CIK 354204 · View history	$9.95M 5,651,021 shares	0.00%	-635.30K(-10.10%)Reduced	SEC filing ↗ Nov 4, 2026	▾
02	GEODE CAPITAL MANAGEMENT, LLC CIK 1214717 · View history	$3.83M 2,175,465 shares	0.00%	-309.60K(-12.50%)Reduced	SEC filing ↗ Nov 6, 2026	▾
03	Silverberg Bernstein Capital Management LLC CIK 2007880 · View history	$725.51K 412,223 shares	0.34%	-6.60K(-1.60%)Reduced	SEC filing ↗ Oct 13, 2026	▾
04	Bank of New York Mellon Corp CIK 1390777 · View history	$675.34K 383,718 shares	0.00%	+3.92K(+1.00%)Added	SEC filing ↗ Nov 5, 2026	▾
05	BARCLAYS PLC CIK 312069 · View history	$604.26K 343,327 shares	0.00%	+248.83K(+263.30%)Added	SEC filing ↗ Nov 6, 2026	▾
06	COMMONWEALTH EQUITY SERVICES, LLC CIK 312272 · View history	$501.11K 284,723 shares	0.00%	0(0.00%)Unchanged	SEC filing ↗ Nov 2, 2026	▾
07	Creative Planning CIK 1540235 · View history	$314.30K 178,577 shares	0.00%	+77.95K(+77.50%)Added	SEC filing ↗ Nov 2, 2026	▾
08	LSV ASSET MANAGEMENT CIK 1050470 · View history	$239.00K 135,800 shares	0.00%	0(0.00%)Unchanged	SEC filing ↗ Nov 6, 2026	▾
09	CITIGROUP INC CIK 831001 · View history	$171.38K 97,372 shares	0.00%	+9.46K(+10.80%)Added	SEC filing ↗ Nov 4, 2026	▾
10	INDEPENDENT FINANCIAL GROUP, LLC CIK 275484 · View history	$163.98K 93,168 shares	0.00%	+93.17KNew	SEC filing ↗ Oct 13, 2026	▾
11	Russell Investments Group, Ltd. CIK 1692234 · View history	$141.67K 80,497 shares	0.00%	-304.73K(-79.10%)Reduced	SEC filing ↗ Nov 6, 2026	▾
12	DEUTSCHE BANK AG\ CIK 948046 · View history	$126.12K 71,660 shares	0.00%	-10.28K(-12.50%)Reduced	SEC filing ↗ Nov 6, 2026	▾
13	SEVEN MILE ADVISORY CIK 1987932 · View history	$110.05K 62,526 shares	0.07%	+62.53KNew	SEC filing ↗ Oct 22, 2026	▾
14	Assenagon Asset Management S.A. CIK 1546007 · View history	$66.75K 37,927 shares	0.00%	0(0.00%)Unchanged	SEC filing ↗ Oct 15, 2026	▾
15	State of Alaska, Department of Revenue CIK 1370102 · View history	$48.00K 27,786 shares	0.00%	+2.40K(+9.40%)Added	SEC filing ↗ Oct 15, 2026	▾
16	WEDBUSH SECURITIES INC CIK 1142495 · View history	$45.00K 25,553 shares	0.00%	+25.55KNew	SEC filing ↗ Oct 22, 2026	▾
17	STRS OHIO CIK 820478 · View history	$43.47K 24,700 shares	0.00%	+7.10K(+40.30%)Added	SEC filing ↗ Oct 30, 2026	▾
18	MACKENZIE FINANCIAL CORP CIK 919859 · View history	$39.36K 22,362 shares	0.00%	0(0.00%)Unchanged	SEC filing ↗ Nov 2, 2026	▾
19	VISTA INVESTMENT PARTNERS LLC CIK 2023386 · View history	$35.90K 20,400 shares	0.01%	0(0.00%)Unchanged	SEC filing ↗ Oct 8, 2026	▾
20	LPL Financial LLC CIK 1403438 · View history	$34.11K 19,379 shares	0.00%	+1.08K(+5.90%)Added	SEC filing ↗ Nov 6, 2026	▾

Showing 20 / 48 institutions. The complete set is available through the API.

Coverage & totals by quarter

Reporting institutions

Cancelled or null records excluded

Disclosed shares

10,212,997

Not deduplicated across managers

Disclosed value

$17.98M

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. · Q3 2026

Explore all 48 reporting institutions.

This page includes 20 of 48 reporting institutions. Log in to look up the full history beyond 3 years, use advanced screening & filtering, download CSV, and get the complete set through the Akkru API.

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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.