RIBBON COMMUNICATIONS INC

Ticker: RBBN CUSIP: 762544104 Class: Common Stock

Boston Partners's Holding History (CIK: 0001386060)

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

Q4 2018

Shares 290,940 Value ($000) $1,402 Avg Close $5.80 Range $4.62 - $7.20

Q3 2018

Shares 678,730 Value ($000) $4,636 Avg Close $7.12 Range $6.36 - $7.89

Q2 2018

Shares 864,580 Value ($000) $6,156 Avg Close $5.86 Range $4.97 - $7.28

Q1 2018

Shares 774,850 Value ($000) $3,951 Avg Close $6.47 Range $5.01 - $7.93

Q4 2017

Shares 680,140 Value ($000) $5,257 Avg Close $7.68 Range $6.89 - $9.05

Period	Shares	Value ($000)	Average Close	Price Range
Q4 2018	290,940	$1,402	$5.80	$4.62 - $7.20
Q3 2018	678,730	$4,636	$7.12	$6.36 - $7.89
Q2 2018	864,580	$6,156	$5.86	$4.97 - $7.28
Q1 2018	774,850	$3,951	$6.47	$5.01 - $7.93
Q4 2017	680,140	$5,257	$7.68	$6.89 - $9.05