aTYR PHARMA INC — Director's Dealing 2015

May 6, 2015

SEC Form 3 — Initial Statement of Beneficial Ownership

Issuer: aTYR PHARMA INC (LIFE)
CIK: 0001339970
Period of Report: 2015-05-06

Reporting Person: Alta Partners VIII, L.P. (10% Owner)
Reporting Person: Alta Partners Management VIII, LLC (10% Owner)
Reporting Person: JANNEY DANIEL (10% Owner)
Reporting Person: CHAMPSI FARAH (10% Owner)
Reporting Person: NOHRA GUY P (10% Owner)

Holdings (Derivative)

Security	Exercise Price	Expiration	Underlying	Shares	Ownership
Series B Redeemable Convertible Preferred Stock	$		Common Stock (3600000)		Direct
Series B-2 Redeemable Convertible Preferred Stock	$		Common Stock (4320173)		Direct
Series C Redeemable Convertible Preferred Stock	$		Common Stock (4361703)		Direct
Series D Redeemable Convertible Preferred Stock	$		Common Stock (1126866)		Direct
Series E Redeemable Convertible Preferred Stock	$		Common Stock (893655)		Direct

Footnotes

F1: The aggregate number of shares of the Issuer's Preferred Stock held by the Reporting Person converts into Common Stock immediately prior to the closing of the Issuer's initial public offering and has no expiration date. These shares convert into Common Stock on a 1-for-7.95413 basis.

F2: The aggregate number of shares of the Issuer's Preferred Stock held by the Reporting Person converts into Common Stock immediately prior to the closing of the Issuer's initial public offering and has no expiration date. These shares convert into Common Stock on a 1-for-9.6814 basis.

F3: The shares of Preferred Stock are held of record by Alta Partners VIII, L.P. ("APVIII"). Alta Partners Management VIII, LLC ("APMVIII") is the general partner of APVIII. Guy Nohra, Daniel Janney and Farah Champsi are managing directors of APMVIII and exercise shared voting and investment power with respect to the shares owned by APVIII. Each of the reporting persons disclaims beneficial ownership of such securities, except to the extent of his, her or its proportionate pecuniary interest therein.