13G Filing: Capital Research Global Investors and Irhythm Technologies Inc (IRTC)

Page 4 of 5 – SEC Filing

Item 6 Ownership of More than Five Percent on Behalf of Another
Person: One or more clients of Capital Research Global
Investors have the right to receive or the power to direct the
receipt of dividends from, or the proceeds from the sale of,
the Common Stock of iRhythm Technologies, Inc. Capital
Research Global Investors holds more than five percent of the
outstanding Common Stock of iRhythm Technologies, Inc. as of
May 31, 2017 on behalf of each of the following client(s):

SMALLCAP World Fund, Inc.

Item 7 Identification and Classification of the Subsidiary Which
Acquired the Security Being Reported on By the Parent Holding
Company or Control Person: N/A

Item 8 Identification and Classification of Members of the Group:
N/A

Item 9 Notice of Dissolution of Group: N/A

Item 10 Certification

By signing below, I certify that, to the best of my knowledge
and belief, the securities referred to above were acquired and
are held in the ordinary course of business and were not
acquired and are not held for the purpose of or with the effect
of changing or influencing the control of the issuer of the
securities and were not acquired and are not held in connection
with or as a participant in any transaction having that purpose
or effect.

Signature

After reasonable inquiry and to the best of my knowledge and
belief, I certify that the information set forth in this
statement is true, complete and correct.

Date: June 8, 2017

Signature: Timothy D. Armour***
Name/Title: Timothy D. Armour – Partner
Capital Research Global Investors

CUSIP: 450056106 Page 4 of 5