Exhibit 31.2

CERTIFICATIONS

I, Yasir B. Al-Wakeel, certify that:

1. I have reviewed this Amendment No. 1 to the Annual Report on Form 10-K of Neon Therapeutics, Inc.; and

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

Date: April 21, 2020	By:	/s/ Yasir B. Al-Wakeel
		Yasir B. Al-Wakeel, B.M.B.Ch.
		Chief Financial Officer (Principal Financial Officer and Principal Accounting Officer)