IRHYTHM TECHNOLOGIES INC

Ticker: IRTC CUSIP: 450056106 Class: EQTY

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

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

Q1 2021

Shares 3,800 Value ($000) $528 Avg Close $179.22 Range $125.10 - $286.19

Q4 2020

Shares 5,100 Value ($000) $1,210 Avg Close $227.91 Range $179.01 - $274.21

Q3 2020

Shares 9,700 Value ($000) $2,310 Avg Close $176.91 Range $108.86 - $241.93

Q1 2020

Shares 9,500 Value ($000) $773 Avg Close $82.93 Range $56.54 - $104.25

Period	Shares	Value ($000)	Average Close	Price Range
Q1 2021	3,800	$528	$179.22	$125.10 - $286.19
Q4 2020	5,100	$1,210	$227.91	$179.01 - $274.21
Q3 2020	9,700	$2,310	$176.91	$108.86 - $241.93
Q1 2020	9,500	$773	$82.93	$56.54 - $104.25