Company: RGNX
Filing Date: 2025-04-08
Form Type: DEFA14A
Source: 0000950170-25-052082
Chunk: 0

Company: REGENXBIO Inc.
Filing Date: 2025-04-08
Form: DEFA14A
Chunk 0
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<div align='center'>UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 14A

(Rule 14a-101)

Proxy Statement Pursuant to Section 14(a) of the

Securities Exchange Act of 1934

(Amendment No. )</div>

Filed by the Registrant☒Filed by a party other than the Registrant☐

Check the appropriate box:☐Preliminary Proxy Statement☐Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2))☐Definitive Proxy Statement☒Definitive Additional Materials☐Soliciting Material Pursuant to §240.14a-12

<div align='center'>REGENXBIO Inc.

(Name of Registrant as Specified In Its Charter)

(Name of Person(s) Filing Proxy Statement, if other than the Registrant)</div>

Payment of Filing Fee (Check the appropriate box):

☒No fee required

☐Fee paid previously with preliminary materials

☐Fee computed on table in exhibit required by Item 25(b) per Exchange Act Rule 14a-6(i)(1) and 0-11