Ribbon Communications Inc.
US ˙ NasdaqGS ˙ US7625441040

SecurityRBBN / Ribbon Communications Inc.
InstitutionNorthern Trust Corp
Latest Disclosed Ownership705,858 shares
Latest Disclosed Value $ 1,496,419
Northern Trust Corp reports 23.49% decrease in ownership of RBBN / Ribbon Communications Inc.

On May 14, 2026 - Northern Trust Corp filed a 13F-HR form disclosing ownership of 705,858 shares of Ribbon Communications Inc. (US:RBBN) valued at $1,496,419 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 922,554 shares of Ribbon Communications Inc.. This represents a change in shares of -23.49% during the quarter. The current value of the position is $2,166,984 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)
2026-05-14 2026-03-31 13F RIBBON COMMUNICATIONS COM 762544104 705,858 -216,696 -23.49 1,496 -43.67 0.0000
2026-02-17 2025-12-31 13F RIBBON COMMUNICATIONS COM 762544104 922,554 -75,557 -7.57 2,657 -29.96 0.0001
2025-11-14 2025-09-30 13F RIBBON COMMUNICATIONS COM 762544104 998,111 -828 -0.08 3,793 -5.32 0.0001
2025-08-13 2025-06-30 13F RIBBON COMMUNICATIONS COM 762544104 998,939 192,001 23.79 4,006 26.62 0.0006
2025-05-13 2025-03-31 13F RIBBON COMMUNICATIONS COM 762544104 806,938 -21,225 -2.56 3,163 -8.19 0.0005
2025-02-14 2024-12-31 13F RIBBON COMMUNICATIONS COM 762544104 828,163 56,461 7.32 3,445 37.36 0.0005
2024-11-13 2024-09-30 13F RIBBON COMMUNICATIONS COM 762544104 771,702 17,952 2.38 2,508 1.17 0.0004
2024-08-14 2024-06-30 13F RIBBON COMMUNICATIONS COM 762544104 753,750 -8,829 -1.16 2,480 1.60 0.0004
2024-05-14 2024-03-31 13F RIBBON COMMUNICATIONS COM 762544104 762,579 -99,796 -11.57 2,440 -2.40 0.0004
2024-02-13 2023-12-31 13F RIBBON COMMUNICATIONS COM 762544104 862,375 9,537 1.12 2,501 9.41 0.0005
2023-11-13 2023-09-30 13F RIBBON COMMUNICATIONS COM 762544104 852,838 -2,894 -0.34 2,286 -4.27 0.0004
2023-08-11 2023-06-30 13F RIBBON COMMUNICATIONS COM 762544104 855,732 195,041 29.52 2,387 5.67 0.0005
2023-05-15 2023-03-31 13F RIBBON COMMUNICATIONS COM 762544104 660,691 -35,297 -5.07 2,260 16.38 0.0004
2023-02-13 2022-12-31 13F RIBBON COMMUNICATIONS COM 762544104 695,988 -3,921 -0.56 1,942 24.90 0.0004
2022-11-14 2022-09-30 13F RIBBON COMMUNICATIONS COM 762544104 699,909 -81,937 -10.48 1,554 -34.62 0.0004
2022-08-12 2022-06-30 13F RIBBON COMMUNICATIONS COM 762544104 781,846 -14,471 -1.82 2,377 -3.41 0.0005
2022-05-13 2022-03-31 13F RIBBON COMMUNICATIONS COM 762544104 796,317 -19,230 -2.36 2,461 -50.12 0.0004
2022-02-08 2021-12-31 13F RIBBON COMMUNICATIONS COM 762544104 815,547 -6,299 -0.77 4,934 0.39 0.0008
2021-11-15 2021-09-30 13F RIBBON COMMUNICATIONS COM 762544104 821,846 -12,335 -1.48 4,915 -22.57 0.0009
2021-08-13 2021-06-30 13F RIBBON COMMUNICATIONS COM 762544104 834,181 7,211 0.87 6,348 -6.50 0.0011
2021-05-12 2021-03-31 13F RIBBON COMMUNICATIONS COM 762544104 826,970 -39,821 -4.59 6,789 19.40 0.0013
2021-02-11 2020-12-31 13F RIBBON COMMUNICATIONS COM 762544104 866,791 -15,878 -1.80 5,686 66.45 0.0011
2020-11-16 2020-09-30 13F RIBBON COMMUNICATIONS COM 762544104 882,669 607 0.07 3,416 -1.44 0.0007
2020-08-14 2020-06-30 13F RIBBON COMMUNICATIONS COM 762544104 882,062 71,493 8.82 3,466 41.18 0.0008
2020-05-14 2020-03-31 13F RIBBON COMMUNICATIONS COM 762544104 810,569 111,359 15.93 2,455 13.29 0.0007
2020-02-14 2019-12-31 13F RIBBON COMMUNICATIONS COM 762544104 699,210 -1,079 -0.15 2,167 -47.02 0.0005
2019-11-13 2019-09-30 13F RIBBON COMMUNICATIONS COM 762544104 700,289 75,671 12.11 4,090 33.92 0.0010
2019-08-13 2019-06-30 13F RIBBON COMMUNICATIONS COM 762544104 624,618 -24,478 -3.77 3,054 -8.64 0.0007
2019-05-13 2019-03-31 13F RIBBON COMMUNICATIONS COM 762544104 649,096 2,110 0.33 3,343 7.22 0.0008
2019-02-12 2018-12-31 13F RIBBON COMMUNICATIONS COM 762544104 646,986 18,400 2.93 3,118 -27.37 0.0009
2018-11-14 2018-09-30 13F RIBBON COMMUNICATIONS COM 762544104 628,586 13,856 2.25 4,293 -1.92 0.0011
2018-09-18 2018-06-30 13F/A-1 RIBBON COMMUNICATIONS COM 762544104 614,730 56,051 10.03 4,377 53.69 0.0011
2018-08-14 2018-06-30 13F RIBBON COMMUNICATIONS COM 762544104 620,693 62,014 4,420
2018-05-09 2018-03-31 13F RIBBON COMMUNICATIONS COM 762544104 558,679 23,048 4.30 2,848 -31.21 0.0007
2018-02-14 2017-12-31 13F RIBBON COMMUNICATIONS COM 762544104 535,631 535,631 4,140 0.0010
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.