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 25, 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 25, 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 25, 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 25, 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 25, 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 25, 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