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.)

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 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 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.

[First used on or about May 30, 2023]

[First used on or about May 30, 2023]

LESS THAN ONE WEEK REMAINS! All #NKLA stockholders are urged to vote FOR Proposal 2 by calling (855) 935-2562 or 1 (551) 210-9929 for international holders. The deadline for voting is June 6, 2023, at 11:59 p.m. ET. https://www.nikolamotor.com/stockholder-meeting/

[First used on or about May 31, 2023]

Join Nikola’s CEO, Michael Lohscheller, at tomorrow’s “Fireside Chat” and Q&A session for Stockholders at 4:30 p.m. ET (1:30 p.m. PT) to address questions related to the upcoming Annual Meeting of Stockholders. Learn more here:

https://www.nikolamotor.com/press_releases/nikola-corporation-announces-date-for-ceo-fireside-chat-and-qa-platform-for-stockholders-with-michael-lohscheller/

[First used on or about June 1, 2023]

#NKLA stockholders, we urge you to vote your shares TODAY. Voting is quick and easy. Contact Alliance Advisors at (855) 935-2562, or 1 (551) 210-9929 for international holders, to vote FOR today. The deadline is June 6, 2023, at 11:59 p.m. ET.

https://www.nikolamotor.com/stockholder-meeting/