Exhibit 99
Form 3 Joint Filer Information
Name: New Leaf Venture Associates II, L.P.
Address: c/o New Leaf Venture Partners,
7 Times Square, Suite 3502 New York,
NY 10036
Designated Filer: New Leaf Ventures II, L.P.
Issuer & Ticker Symbol: iRhythm Technologies, Inc. (IRTC)
Date of Event Requiring Statement: October 19, 2016
Signature: /s/ Craig L. Slutzkin, attorney-in-fact,
New Leaf Venture Associates II, L.P.,
as general partner of New Leaf
Ventures II, L.P.
Name: New Leaf Venture Management II, L.L. C.
Address: c/o New Leaf Venture Partners,
7 Times Square, Suite 3502 New York,
NY 10036
Designated Filer: New Leaf Ventures II, L.P.
Issuer & Ticker Symbol: iRhythm Technologies, Inc. (IRTC)
Date of Event Requiring Statement: October 19, 2016
Signature: /s/ Craig L. Slutzkin, attorney-in-fact,
New Leaf Venture Management II, L.L.C,
as general partner of New Leaf Venture
Associates II, L.P
Name: Philippe O. Chambon
Address: c/o New Leaf Venture Partners, 7 Times
Square, Suite 3502 New York, NY 10036
Designated Filer: New Leaf Ventures II, L.P.
Issuer & Ticker Symbol: iRhythm Technologies, Inc. (IRTC)
Date of Event Requiring Statement: October 19, 2016
Signature: /s/ Craig L. Slutzkin, attorney-in-fact
on behalf of Philippe O. Chambon, as
Member of New Leaf Venture
Management II, L.L.C.
Name: Jeani Delagardelle
Address: c/o New Leaf Venture Partners, 1200 Park
Place, Suite 300 San Mateo, CA 94403
Designated Filer: New Leaf Ventures II, L.P.
Issuer & Ticker Symbol: iRhythm Technologies, Inc. (IRTC)
Date of Event Requiring Statement: October 19, 2016
Signature: /s/ Craig L. Slutzkin, attorney-in-fact
on behalf of Jeani Delagardelle, as Member
of New Leaf Venture Management II, L.L.C.
Name: Ronald M. Hunt
Address: c/o New Leaf Venture Partners, 7 Times
Square, Suite 3502 New York, NY 10036
Designated Filer: New Leaf Ventures II, L.P.
Issuer & Ticker Symbol: iRhythm Technologies, Inc. (IRTC)
Date of Event Requiring Statement: October 19, 2016
Signature: /s/ Craig L. Slutzkin, attorney-in-fact on
behalf of Ronald M. Hunt, as Member of New
Leaf Venture Management II, L.L.C.
Name: Liam Ratcliffe
Address: c/o New Leaf Venture Partners, 7 Times
Square, Suite 3502 New York, NY 10036
Designated Filer: New Leaf Ventures II, L.P.
Issuer & Ticker Symbol: iRhythm Technologies, Inc. (IRTC)
Date of Event Requiring Statement: October 19, 2016
Signature: /s/ Craig L. Slutzkin, attorney-in-fact on
behalf of Liam Ratcliffe, as Member of New
Leaf Venture Management II, L.L.C.
