Adverum Biotechnologies DEFA14A Additional proxy soliciting materials

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☐	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 Under Rule 14a-12

☒	No fee required
☐	Fee paid previously with preliminary materials.
☐	Fee computed on table in exhibit required by Item 25(b) per Exchange Act Rules 14a-6(i)(1) and 0-11.

Adverum Biotechnologies (ADVM) DEFA14AAdditional proxy soliciting materials