How many subsidiaries does Ribbon Communications Inc. file with the SEC?

41, listed in its most recent exhibit 21. They are incorporated across 31 jurisdictions, led by Argentina, Australia, Brazil. That exhibit is filed with the company's annual report and is the company's own list, not an estimate.

Is Ribbon Communications Inc. financially healthy?

Ribbon Communications Inc. scores 6 out of 9 on the Piotroski F-score. Its Altman Z-score puts it in the distress zone. Every test and the numbers behind it are shown above, so the arithmetic is checkable rather than something you have to take on trust.

Who are the largest institutional holders of Ribbon Communications Inc.?

Among the managers tracked here, the biggest positions as of the 2026-Q2 13F filings are JPMORGAN CHASE & CO (trimming), BlackRock, Inc. (adding), GEODE CAPITAL MANAGEMENT, LLC (adding). Direction is the change in share count against that manager's own previous filing; managers with no prior filing are left out rather than counted as new buyers.

Ribbon Communications Inc. (RBBN)

Nasdaq · Services-Computer Integrated Systems Design

One email a week from me: what it filed, which 13F holders added or cut, where its scores stand. Free.

Corporate structure

41 entities across 31 jurisdictions. Read directly from the company’s own 10-K EX-21 filed 2026-02-26 — see the exhibit.

Which other public companies file entities in the same places:

Israel4 Netherlands4 China2 India2 Russia2 Vietnam2 Argentina1 Australia1 Brazil1 Canada1 Chile1 Colombia1

Subsidiaries of Ribbon Communications Inc. as disclosed in its SEC filing
Entity	Jurisdiction	Note
ECI de Argentina S.A.	Argentina
Ribbon Communications Australia Pty Ltd	Australia
Ribbon Communications do Brasil Ltda.	Brazil
Ribbon Communications Canada ULC	Canada
Ribbon Networks Communications Chile Limitada	Chile
Ribbon Communications Shanghai Co., Ltd.	China
Ribbon Communications Shanghai Co., LTD Hangzhou Branch	China
Ribbon Communications Sur America Ltda.	Colombia
Ribbon Communications Czech Republic s.r.o.	Czech Republic
Ribbon Communications France EURL

Financial health

Two standard screens, computed from the XBRL in FY2025 against FY2024. Every test shows the numbers behind it — a score with its inputs hidden is a number you cannot check.

Piotroski F-score

6 / 9

PASSReturn on assets positiveROA 3.3%
PASSOperating cash flow positiveOCF 51M
PASSReturn on assets improving-4.7% → 3.3%
PASSCash flow exceeds earningsOCF 51M vs NI 40M
PASSLong-term debt ratio falling28.4% → 26.8% of assets
PASSCurrent ratio improving1.41 → 1.44
FAILNo share dilution174M → 180M shares
FAILGross margin improving52.7% → 49.8%
FAILAsset turnover improving0.72× → 0.70×

Altman Z-score

-0.71distress

Bankruptcy-risk screen combining working capital, retained earnings, operating income, market value against liabilities, and asset turnover. Above 2.99 is the safe zone; below 1.81 is distress.

Six-year record

Year	Revenue	Net income	Free cash flow	Gross margin	Shares
FY2020	$843.8M	$88.6M	$74.8M	58.4%	144,650,000
FY2021	$845.0M	−$177.2M	$2.0M	52.6%	147,575,000
FY2022	$819.8M	−$98.1M	−$36.6M	48.9%	156,668,000
FY2023	$826.3M	−$66.2M	$7.7M	49.4%	170,408,000
FY2024	$833.9M	−$54.2M	$27.8M	52.7%	174,044,000

Ownership flow

10 institutions tracked — 7 added, 2 reduced.

Institutional holders of Ribbon Communications Inc. and their share-count change
Manager	Kind	Shares	Change	Value
CITADEL ADVISORS LLC	Hedge fund	1,268,900	+676,111	$3.0M
BlackRock, Inc.	Index	7,146,590	+422,583	$16.7M
AQR CAPITAL MANAGEMENT LLC	Hedge fund	1,409,795	+152,448	$3.3M
GEODE CAPITAL MANAGEMENT, LLC	Index	2,485,064	+70,504	$5.8M

Capital returned

What the company actually paid out and bought back, as reported — the record behind any yield figure.

Shares repurchased

2026Q1: $824,000
2025Q3: $3.5M
2025Q2: $2.3M

Identity

CIK: 0001708055
LEI: 549300L1E8Z8RL7CUL52
SIC: 7373 · Services-Computer Integrated Systems Design
Incorporated: DE
Headquarters: PLANO, TX

Ownership

Institutional: 73.3%
Institutions: 211
Insiders: 18.8%

Ownership percentages are a vendor aggregate, not a filing — unlike everything else on this page.

Other services-computer integrated systems design companies

Ribbon Communications Inc. files under SIC 7373 — all 14 services-computer integrated systems design companies compared on assets and F-score.

Leidos Holdings, Inc.LDOS OPEN TEXT CORPOTEX Kyndryl Holdings, Inc.KD CACI INTERNATIONAL INC /DE/CACI GoDaddy Inc.GDDY IonQ, Inc.IONQ

Questions about Ribbon Communications Inc.

How many subsidiaries does Ribbon Communications Inc. file with the SEC?: 41, listed in its most recent exhibit 21. They are incorporated across 31 jurisdictions, led by Argentina, Australia, Brazil. That exhibit is filed with the company's annual report and is the company's own list, not an estimate.
Is Ribbon Communications Inc. financially healthy?: Ribbon Communications Inc. scores 6 out of 9 on the Piotroski F-score. Its Altman Z-score puts it in the distress zone. Every test and the numbers behind it are shown above, so the arithmetic is checkable rather than something you have to take on trust.
Who are the largest institutional holders of Ribbon Communications Inc.?: Among the managers tracked here, the biggest positions as of the 2026-Q2 13F filings are JPMORGAN CHASE & CO (trimming), BlackRock, Inc. (adding), GEODE CAPITAL MANAGEMENT, LLC (adding). Direction is the change in share count against that manager's own previous filing; managers with no prior filing are left out rather than counted as new buyers.

This page is one panel of the terminal

The structure map above is the Corporate Blueprint, and in the desktop it is interactive — click any entity to re-centre the map on it and walk the ownership chain. It sits alongside the screener, the scorecard and the filings lab on one desk, on your machine.

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Sourced from SEC EDGAR primary filings. Figures are as reported by the company and are not investment advice. Scores are standard published screens computed from those filings; every input is shown above so you can check the arithmetic.