RIBBON COMMUNICATIONS INC

Ticker: RBBN CUSIP: 762544104 Class: Common Stock

OBERWEIS ASSET MANAGEMENT INC/'s Holding History (CIK: 0000937886)

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

Q1 2021

Shares 101,400 Value ($000) $832 Avg Close $8.28 Range $6.22 - $11.25

Q4 2020

Shares 72,000 Value ($000) $472 Avg Close $5.28 Range $3.62 - $7.49

Q4 2018

Shares 85,300 Value ($000) $411 Avg Close $5.80 Range $4.62 - $7.20

Period	Shares	Value ($000)	Average Close	Price Range
Q1 2021	101,400	$832	$8.28	$6.22 - $11.25
Q4 2020	72,000	$472	$5.28	$3.62 - $7.49
Q4 2018	85,300	$411	$5.80	$4.62 - $7.20