UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 14A

Proxy Statement Pursuant to Section 14(a) of the

Securities Exchange Act of 1934 (Amendment No.)

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Filed by a Party other than the Registrant ☐

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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 §240.14a-12

Nikola Corporation

(Name of Registrant as Specified In Its Charter)

(Name of Person(s) Filing Proxy Statement, if other than the Registrant)

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

[First used on May 15, 2023]

We urge all #NKLA stockholders to vote FOR Proposal 2. Vote TODAY by calling Alliance Advisors at (855) 935-2562. The deadline is June 6, 2023, at 11:59 p.m. ET. https://www.nikolamotor.com/stockholder-meeting/

[First used on or about May 17, 2023]

#NKLA stockholders, voting is quick and easy and EVERY share counts. Contact Alliance Advisors at (855) 935-2562 to vote FOR all proposals TODAY. https://www.nikolamotor.com/stockholder-meeting/

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