RIBBON COMMUNICATIONS INC

Ticker: RBBN CUSIP: 762544104 Class: Common Stock

ARROWSTREET CAPITAL, LIMITED PARTNERSHIP's Holding History (CIK: 0001164508)

Note: Option positions (PUT/CALL) are excluded.

Q4 2025

Shares 1,029,716 Value ($000) $2,966 Avg Close $3.23 Range $2.72 - $4.09

Q3 2025

Shares 964,446 Value ($000) $3,665 Avg Close $3.93 Range $3.57 - $4.29

Q2 2025

Shares 483,170 Value ($000) $1,938 Avg Close $3.60 Range $3.01 - $4.29

Q1 2025

Shares 556,324 Value ($000) $2,181 Avg Close $4.21 Range $3.66 - $5.38

Q4 2024

Shares 589,756 Value ($000) $2,453 Avg Close $3.78 Range $3.03 - $4.39

Q3 2024

Shares 690,070 Value ($000) $2,243 Avg Close $3.24 Range $2.75 - $3.95

Q2 2024

Shares 725,273 Value ($000) $2 Avg Close $3.04 Range $2.47 - $3.58

Q1 2024

Shares 809,253 Value ($000) $3 Avg Close $3.04 Range $2.75 - $3.65

Q4 2023

Shares 624,353 Value ($000) $2 Avg Close $2.25 Range $1.78 - $3.00

Q3 2023

Shares 1,047,446 Value ($000) $3 Avg Close $2.92 Range $2.59 - $3.59

Q2 2023

Shares 1,071,142 Value ($000) $3 Avg Close $2.77 Range $2.30 - $3.49

Q1 2023

Shares 902,256 Value ($000) $3 Avg Close $3.65 Range $2.70 - $4.84

Q4 2022

Shares 467,514 Value ($000) $1 Avg Close $2.59 Range $2.19 - $3.14

Q3 2022

Shares 467,514 Value ($000) $1,038 Avg Close $3.17 Range $2.22 - $3.99

Q2 2022

Shares 430,372 Value ($000) $1,308 Avg Close $3.02 Range $2.57 - $3.65

Q1 2022

Shares 279,715 Value ($000) $864 Avg Close $4.10 Range $2.74 - $6.42

Q4 2021

Shares 361,690 Value ($000) $2,188 Avg Close $5.93 Range $5.11 - $6.46

Q3 2021

Shares 743,708 Value ($000) $4,447 Avg Close $6.75 Range $5.80 - $7.78

Q2 2021

Shares 1,054,856 Value ($000) $8,027 Avg Close $7.65 Range $6.29 - $8.72

Q1 2021

Shares 837,961 Value ($000) $6,880 Avg Close $8.28 Range $6.22 - $11.25

Q4 2020

Shares 717,207 Value ($000) $4,705 Avg Close $5.28 Range $3.62 - $7.49

Q3 2020

Shares 663,511 Value ($000) $2,568 Avg Close $4.22 Range $3.61 - $5.64

Q2 2020

Shares 792,781 Value ($000) $3,116 Avg Close $3.63 Range $2.67 - $4.68

Q1 2020

Shares 792,781 Value ($000) $2,402 Avg Close $3.01 Range $1.95 - $3.68

Q4 2019

Shares 723,026 Value ($000) $2,241 Avg Close $3.98 Range $2.44 - $5.92

Q3 2019

Shares 453,200 Value ($000) $2,647 Avg Close $5.25 Range $4.79 - $5.93

Q2 2019

Shares 190,316 Value ($000) $931 Avg Close $4.88 Range $4.23 - $5.55

Q1 2019

Shares 502,420 Value ($000) $2,587 Avg Close $5.36 Range $4.64 - $6.56

Q4 2018

Shares 174,327 Value ($000) $840 Avg Close $5.80 Range $4.62 - $7.20

Q1 2018

Shares 221,148 Value ($000) $1,128 Avg Close $6.47 Range $5.01 - $7.93

Q4 2017

Shares 126,646 Value ($000) $979 Avg Close $7.68 Range $6.89 - $9.05

Period	Shares	Value ($000)	Average Close	Price Range
Q4 2025	1,029,716	$2,966	$3.23	$2.72 - $4.09
Q3 2025	964,446	$3,665	$3.93	$3.57 - $4.29
Q2 2025	483,170	$1,938	$3.60	$3.01 - $4.29
Q1 2025	556,324	$2,181	$4.21	$3.66 - $5.38
Q4 2024	589,756	$2,453	$3.78	$3.03 - $4.39
Q3 2024	690,070	$2,243	$3.24	$2.75 - $3.95
Q2 2024	725,273	$2	$3.04	$2.47 - $3.58
Q1 2024	809,253	$3	$3.04	$2.75 - $3.65
Q4 2023	624,353	$2	$2.25	$1.78 - $3.00
Q3 2023	1,047,446	$3	$2.92	$2.59 - $3.59
Q2 2023	1,071,142	$3	$2.77	$2.30 - $3.49
Q1 2023	902,256	$3	$3.65	$2.70 - $4.84
Q4 2022	467,514	$1	$2.59	$2.19 - $3.14
Q3 2022	467,514	$1,038	$3.17	$2.22 - $3.99
Q2 2022	430,372	$1,308	$3.02	$2.57 - $3.65
Q1 2022	279,715	$864	$4.10	$2.74 - $6.42
Q4 2021	361,690	$2,188	$5.93	$5.11 - $6.46
Q3 2021	743,708	$4,447	$6.75	$5.80 - $7.78
Q2 2021	1,054,856	$8,027	$7.65	$6.29 - $8.72
Q1 2021	837,961	$6,880	$8.28	$6.22 - $11.25
Q4 2020	717,207	$4,705	$5.28	$3.62 - $7.49
Q3 2020	663,511	$2,568	$4.22	$3.61 - $5.64
Q2 2020	792,781	$3,116	$3.63	$2.67 - $4.68
Q1 2020	792,781	$2,402	$3.01	$1.95 - $3.68
Q4 2019	723,026	$2,241	$3.98	$2.44 - $5.92
Q3 2019	453,200	$2,647	$5.25	$4.79 - $5.93
Q2 2019	190,316	$931	$4.88	$4.23 - $5.55
Q1 2019	502,420	$2,587	$5.36	$4.64 - $6.56
Q4 2018	174,327	$840	$5.80	$4.62 - $7.20
Q1 2018	221,148	$1,128	$6.47	$5.01 - $7.93
Q4 2017	126,646	$979	$7.68	$6.89 - $9.05