Exhibit 31.3
CERTIFICATIONS
I, David Fellows, certify that:
1. I have reviewed this Amendment No. 1 to the Annual Report on Form 10-K of Nightstar Therapeutics plc; 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.
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Date: April 30, 2019 |
| By: |
| /s/ David Fellows |
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| David Fellows |
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| Chief Executive Officer |
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| (Principal Executive Officer) |
