리본커뮤니케이션즈(주)
US ˙ NasdaqGS ˙ US7625441040

SecurityRBBN / Ribbon Communications Inc.
InstitutionVanguard Group Inc
Latest Disclosed Ownership7,833,009 shares
Latest Disclosed Value $ 22,559,066
Vanguard Group Inc reports 1.85% increase in ownership of RBBN / Ribbon Communications Inc.

On January 29, 2026 - Vanguard Group Inc filed a 13F-HR form disclosing ownership of 7,833,009 shares of Ribbon Communications Inc. (US:RBBN) valued at $22,559,066 USD as of December 31, 2025. The entity filed a previous 13F-HR on November 7, 2025 disclosing 7,691,070 shares of Ribbon Communications Inc.. This represents a change in shares of 1.85% during the quarter. The current value of the position is $24,047,338 USD.

Institutional Ownership: 13F and NPORT Filings

The Security and Class in the table below are shown exactly as filed by the investor. We do our best to track continuity of investments through acquisitions, and this will be reflected in the table as changes in names. In addition to descriptive data, performance of the investment is shown over time. To calculate quarterly performance, we first calculate cost basis of the shares purchased during the quarter, then use that to calculate gross profit. Quarterly return is Gross Profit / Starting Portfolio value.

Note that cost basis is calculated and stored in thousands, so small quarterly changes in shares frequently result in a cost basis of zero.

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Disclosed Equity Positions (from 13F/NPORT Filings)
File
Date		 Effective
Date		Form Security Class ID Avg Price
Paid (Est)		 Reported
Shares		 ΔShares ΔShares
(%)		 Reported
Value
(x1000)		 ΔValue
(%)		 Alloc
(%)		 ΔAlloc ΔAlloc (%) Cost Basis
(x1000)		 Unrealized
Gain/Loss
(x1000)
2026-01-29 2025-12-31 13F RIBBON COMMUNICATIONS COM 762544104 7,833,009 141,939 1.85 22,559 -22.81 0.0003
2025-11-07 2025-09-30 13F RIBBON COMMUNICATIONS COM 762544104 7,691,070 166,683 2.22 29,226 -3.14 0.0004
2025-08-11 2025-06-30 13F RIBBON COMMUNICATIONS COM 762544104 7,524,387 66,920 0.90 30,173 3.21 0.0005
2025-05-09 2025-03-31 13F RIBBON COMMUNICATIONS COM 762544104 7,457,467 55,394 0.75 29,233 -5.06 0.0005
2025-02-11 2024-12-31 13F RIBBON COMMUNICATIONS COM 762544104 7,402,073 295,524 4.16 30,793 33.32 0.0005
2024-11-13 2024-09-30 13F RIBBON COMMUNICATIONS COM 762544104 7,106,549 95,027 1.36 23,096 0.13 0.0004
2024-08-13 2024-06-30 13F RIBBON COMMUNICATIONS COM 762544104 7,011,522 78,694 1.14 23,068 3.98 0.0004
2024-05-10 2024-03-31 13F RIBBON COMMUNICATIONS COM 762544104 6,932,828 -50,384 -0.72 22,185 9.55 0.0004
2024-03-11 2023-12-31 13F/A-1 RIBBON COMMUNICATIONS COM 762544104 6,983,212 120,901 1.76 20,251 10.12 0.0004
2024-02-14 2023-12-31 13F RIBBON COMMUNICATIONS COM 762544104 6,983,212 120,901 20,251 0.0004
2023-12-18 2023-09-30 13F/A-1 RIBBON COMMUNICATIONS COM 762544104 6,862,311 35,132 0.51 18,391 -3.45 0.0005
2023-11-14 2023-09-30 13F RIBBON COMMUNICATIONS COM 762544104 6,862,311 35,132 18,391 0.0001
2023-08-14 2023-06-30 13F RIBBON COMMUNICATIONS COM 762544104 6,827,179 1,434,479 26.60 19,048 3.27 0.0005
2023-07-14 2023-03-31 13F/A-1 RIBBON COMMUNICATIONS COM 762544104 5,392,700 144,265 2.75 18,443 25.95 0.0005
2023-05-15 2023-03-31 13F RIBBON COMMUNICATIONS COM 762544104 5,392,700 144,265 18,443 0.0005
2023-02-10 2022-12-31 13F RIBBON COMMUNICATIONS COM 762544104 5,248,435 122,867 2.40 14,643 28.68 0.0004
2022-11-14 2022-09-30 13F RIBBON COMMUNICATIONS COM 762544104 5,125,568 280,524 5.79 11,379 -22.75 0.0003
2022-08-12 2022-06-30 13F RIBBON COMMUNICATIONS COM 762544104 4,845,044 194,609 4.18 14,730 2.50 0.0004
2022-05-13 2022-03-31 13F RIBBON COMMUNICATIONS COM 762544104 4,650,435 -10,203 -0.22 14,371 -49.04 0.0003
2022-02-14 2021-12-31 13F RIBBON COMMUNICATIONS COM 762544104 4,660,638 220,645 4.97 28,198 6.20 0.0006
2021-11-12 2021-09-30 13F RIBBON COMMUNICATIONS COM 762544104 4,439,993 -120,704 -2.65 26,552 -23.50 0.0007
2021-08-13 2021-06-30 13F RIBBON COMMUNICATIONS COM 762544104 4,560,697 285,579 6.68 34,707 -1.12 0.0009
2021-05-14 2021-03-31 13F RIBBON COMMUNICATIONS COM 762544104 4,275,118 346,729 8.83 35,099 36.20 0.0009
2021-02-12 2020-12-31 13F RIBBON COMMUNICATIONS COM 762544104 3,928,389 225,872 6.10 25,771 79.85 0.0007
2020-11-16 2020-09-30 13F RIBBON COMMUNICATIONS COM 762544104 3,702,517 128,141 3.58 14,329 2.00 0.0005
2020-08-14 2020-06-30 13F RIBBON COMMUNICATIONS COM 762544104 3,574,376 140,479 4.09 14,048 35.00 0.0005
2020-05-15 2020-03-31 13F RIBBON COMMUNICATIONS COM 762544104 3,433,897 591,950 20.83 10,406 18.12 0.0004
2020-02-14 2019-12-31 13F RIBBON COMMUNICATIONS COM 762544104 2,841,947 -912,482 -24.30 8,810 -59.82 0.0003
2019-11-14 2019-09-30 13F RIBBON COMMUNICATIONS COM 762544104 3,754,429 -76,860 -2.01 21,925 17.03 0.0008
2019-08-14 2019-06-30 13F RIBBON COMMUNICATIONS COM 762544104 3,831,289 -48,804 -1.26 18,735 -6.24 0.0007
2019-05-15 2019-03-31 13F RIBBON COMMUNICATIONS COM 762544104 3,880,093 149,553 4.01 19,982 11.12 0.0008
2019-02-14 2018-12-31 13F RIBBON COMMUNICATIONS COM 762544104 3,730,540 83,252 2.28 17,982 -27.82 0.0008
2018-12-13 2018-09-30 13F/A-2 RIBBON COMMUNICATIONS COM 762544104 3,647,288 288,331 8.58 24,911 4.16 0.0010
2018-11-23 2018-09-30 13F/A-1 RIBBON COMMUNICATIONS COM 762544104 3,647,288 0 24,911 0.0010
2018-11-14 2018-09-30 13F RIBBON COMMUNICATIONS COM 762544104 3,647,288 288,331 24,911
2018-08-14 2018-06-30 13F RIBBON COMMUNICATIONS COM 762544104 3,358,957 269,601 8.73 23,916 51.80 0.0010
2018-05-15 2018-03-31 13F RIBBON COMMUNICATIONS COM 762544104 3,089,356 -131,164 -4.07 15,755 -36.72 0.0007
2018-02-14 2017-12-31 13F RIBBON COMMUNICATIONS COM 762544104 3,220,520 3,220,520 24,896 0.0011
Legend
Shares
The total number of shares held by the institution at the end of the reporting period (the effective date). This is provided in the filing.
Value
The total value of the shares as of the effective date. This is provided in the filing.
Avg. Share Price
The weighted average share price of the shares held by the institution. We use FIFO accounting to determine this price
Class
This is the security class as indicated by the filer. There are a variety of values for this field. Common values include "EC" = equity common, "EP" - equity preferred
Allocation (%)
The percent of the institution's portfolio that this position represents. This is provided in NPORT filings. For 13F filings, we calculate it.
Change in Allocation
The change in allocation from the prior reporting period. This is calculated as current allocation - prior allocation.
Change in Allocation (%)
The percent change in allocation from the prior reporting period. This is calculated as (current allocation - prior allocation) / prior allocation.
Cost Basis
The total cost of the shares held. This is calculated as reported shares * avg. share price
Unrealized Gain/Loss
This is the market value of the position as of the effective date minus the cost basis.