REPLIGEN CORP

Ticker: RGEN CUSIP: 759916109 Class: Common Stock

MACKAY SHIELDS LLC's Holding History (CIK: 0000061227)

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

Q2 2020

Shares 6,200 Value ($000) $766 Avg Close $117.64 Range $92.00 - $143.93

Q1 2020

Shares 22,100 Value ($000) $2,133 Avg Close $96.54 Range $78.41 - $109.94

Q4 2019

Shares 8,301 Value ($000) $768 Avg Close $84.01 Range $72.32 - $93.50

Q3 2019

Shares 36,711 Value ($000) $2,816 Avg Close $87.47 Range $75.80 - $99.25

Q2 2019

Shares 39,311 Value ($000) $3,379 Avg Close $68.16 Range $52.87 - $86.16

Q1 2019

Shares 17,274 Value ($000) $1,021 Avg Close $57.51 Range $49.07 - $63.41

Q4 2018

Shares 18,774 Value ($000) $990 Avg Close $58.65 Range $48.26 - $70.50

Q3 2018

Shares 26,906 Value ($000) $1,492 Avg Close $51.54 Range $45.00 - $58.99

Q2 2018

Shares 20,106 Value ($000) $946 Avg Close $41.16 Range $34.61 - $47.87

Q1 2018

Shares 20,706 Value ($000) $749 Avg Close $35.17 Range $29.56 - $37.82

Period	Shares	Value ($000)	Average Close	Price Range
Q2 2020	6,200	$766	$117.64	$92.00 - $143.93
Q1 2020	22,100	$2,133	$96.54	$78.41 - $109.94
Q4 2019	8,301	$768	$84.01	$72.32 - $93.50
Q3 2019	36,711	$2,816	$87.47	$75.80 - $99.25
Q2 2019	39,311	$3,379	$68.16	$52.87 - $86.16
Q1 2019	17,274	$1,021	$57.51	$49.07 - $63.41
Q4 2018	18,774	$990	$58.65	$48.26 - $70.50
Q3 2018	26,906	$1,492	$51.54	$45.00 - $58.99
Q2 2018	20,106	$946	$41.16	$34.61 - $47.87
Q1 2018	20,706	$749	$35.17	$29.56 - $37.82