Ribbon Communications Inc.
US ˙ NasdaqGS ˙ US7625441040

SecurityRBBN / Ribbon Communications Inc.
InstitutionEngineers Gate Manager LP
Latest Disclosed Ownership139,962 shares
Latest Disclosed Value $ 296,719
Engineers Gate Manager LP reports 152.27% increase in ownership of RBBN / Ribbon Communications Inc.

On May 15, 2026 - Engineers Gate Manager LP filed a 13F-HR form disclosing ownership of 139,962 shares of Ribbon Communications Inc. (US:RBBN) valued at $296,719 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 55,480 shares of Ribbon Communications Inc.. This represents a change in shares of 152.27% during the quarter. The current value of the position is $436,681 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)
2026-05-15 2026-03-31 13F RIBBON COMMUNICATIONS COM 762544104 139,962 84,482 152.27 297 86.16 0.0037
2026-02-17 2025-12-31 13F RIBBON COMMUNICATIONS COM 762544104 55,480 55,480 160 0.0019
2025-11-14 2025-09-30 13F RIBBON COMMUNICATIONS COM 762544104 0 -13,176 -100.00 0 -100.00
2025-08-14 2025-06-30 13F RIBBON COMMUNICATIONS COM 762544104 13,176 13,176 53 0.0007
2025-05-15 2025-03-31 13F RIBBON COMMUNICATIONS COM 762544104 0 -18,691 -100.00 0 -100.00
2025-02-14 2024-12-31 13F RIBBON COMMUNICATIONS COM 762544104 18,691 -22,704 -54.85 78 -42.54 0.0014
2024-11-14 2024-09-30 13F RIBBON COMMUNICATIONS COM 762544104 41,395 -13,383 -24.43 135 -25.56 0.0026
2024-08-14 2024-06-30 13F RIBBON COMMUNICATIONS COM 762544104 54,778 -17,606 -24.32 180 -22.08 0.0041
2024-05-15 2024-03-31 13F RIBBON COMMUNICATIONS COM 762544104 72,384 -391 -0.54 232 9.48 0.0061
2024-02-14 2023-12-31 13F RIBBON COMMUNICATIONS COM 762544104 72,775 -11,079 -13.21 211 -5.80 0.0060
2023-11-14 2023-09-30 13F RIBBON COMMUNICATIONS COM 762544104 83,854 -60,201 -41.79 225 -44.14 0.0083
2023-08-14 2023-06-30 13F RIBBON COMMUNICATIONS COM 762544104 144,055 -3,545 -2.40 402 -20.44 0.0152
2023-05-15 2023-03-31 13F RIBBON COMMUNICATIONS COM 762544104 147,600 79,692 117.35 505 166.67 0.0211
2023-02-14 2022-12-31 13F RIBBON COMMUNICATIONS COM 762544104 67,908 -8,699 -11.36 189 11.18 0.0114
2022-11-14 2022-09-30 13F RIBBON COMMUNICATIONS COM 762544104 76,607 -148,252 -65.93 170 -75.15 0.0106
2022-08-15 2022-06-30 13F RIBBON COMMUNICATIONS COM 762544104 224,859 -41,384 -15.54 684 -16.89 0.0251
2022-05-16 2022-03-31 13F RIBBON COMMUNICATIONS COM 762544104 266,243 187,665 238.83 823 73.26 0.0322
2022-02-14 2021-12-31 13F RIBBON COMMUNICATIONS COM 762544104 78,578 78,578 475 0.0214
2021-08-16 2021-06-30 13F RIBBON COMMUNICATIONS COM 762544104 0 -64,923 -100.00 0 -100.00
2021-05-17 2021-03-31 13F RIBBON COMMUNICATIONS COM 762544104 64,923 -37,205 -36.43 533 -20.45 0.0264
2021-02-16 2020-12-31 13F RIBBON COMMUNICATIONS COM 762544104 102,128 102,128 670 0.0291
2020-11-16 2020-09-30 13F RIBBON COMMUNICATIONS COM 762544104 0 -36,284 -100.00 0 -100.00
2020-08-17 2020-06-30 13F RIBBON COMMUNICATIONS COM 762544104 36,284 -36,373 -50.06 143 -35.00 0.0073
2020-05-15 2020-03-31 13F RIBBON COMMUNICATIONS COM 762544104 72,657 42,614 141.84 220 136.56 0.0158
2020-02-14 2019-12-31 13F RIBBON COMMUNICATIONS COM 762544104 30,043 3,822 14.58 93 -39.22 0.0041
2019-11-14 2019-09-30 13F RIBBON COMMUNICATIONS COM 762544104 26,221 -11,486 -30.46 153 -16.85 0.0078
2019-08-14 2019-06-30 13F RIBBON COMMUNICATIONS COM 762544104 37,707 37,707 184 0.0102
2019-05-15 2019-03-31 13F RIBBON COMMUNICATIONS COM 762544104 0 -37,403 -100.00 0 -100.00
2019-02-14 2018-12-31 13F RIBBON COMMUNICATIONS COM 762544104 37,403 37,403 180 0.0144
2018-08-03 2018-06-30 13F RIBBON COMMUNICATIONS COM 762544104 0 -61,656 -100.00 0 -100.00
2018-05-07 2018-03-31 13F RIBBON COMMUNICATIONS COM 762544104 61,656 25,837 72.13 314 13.36 0.0209
2018-02-01 2017-12-31 13F RIBBON COMMUNICATIONS COM 762544104 35,819 35,819 277 0.0190
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.