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The information in this preliminary prospectus supplement and the accompanying prospectus is not complete and may be changed. A registration statement relating to these securities has become effective under the Securities Act of 1933, as amended. This preliminary prospectus supplement and the accompanying prospectus are not an offer to sell these securities and are not soliciting an offer to buy these securities in any jurisdiction where the offer or sale is not permitted.

Filed Pursuant to Rule 424(b)(5)
Registration No. 333-295470

Subject to Completion, dated July 6, 2026

PROSPECTUS SUPPLEMENT
(to Prospectus dated April 30, 2026)

75,000,000 Shares

Rivian Automotive, Inc.

Class A common stock

We are offering 75,000,000 shares of our Class A common stock, par value $0.001 per share (“Class A common stock”).

Our Class A common stock is listed on the Nasdaq Global Select Market (“Nasdaq”) under the symbol “RIVN.” On July 2, 2026, the last reported sale price of our Class A common stock on Nasdaq was $18.63 per share.

Per
Share

Total

Public offering price

Underwriting discounts and commissions(1)

Proceeds before expenses, to us

(1)

See “Underwriting” for a description of the compensation payable to the underwriters.

We intend to grant the underwriters an option for a period of 30 days to purchase up to an additional 11,250,000 shares of our Class A common stock, less the underwriting discounts and commissions set forth above.

Investing in our Class A common stock involves a high degree of risk. See the section titled “Risk Factors” beginning on page S-5 of this prospectus supplement and the other risk factors that we incorporate by reference into this prospectus supplement and the accompanying prospectus.

Neither the Securities and Exchange Commission (the “SEC”) nor any state securities commission has approved or disapproved of these securities or passed upon the adequacy or accuracy of this prospectus supplement or the accompanying prospectus. Any representation to the contrary is a criminal offense.

The underwriters expect to deliver the shares to purchasers on or about , 2026.

Joint Book-Running Managers

Goldman Sachs & Co. LLC

Allen & Company LLC

Barclays

J.P. Morgan

Morgan Stanley

Wells Fargo Securities

The date of this prospectus supplement is , 2026

	Page
PROSPECTUS SUPPLEMENT
ABOUT THIS PROSPECTUS SUPPLEMENT		S-ii
CAUTIONARY NOTE REGARDING FORWARD-LOOKING STATEMENTS		S-iii
PROSPECTUS SUPPLEMENT SUMMARY		S-1
RISK FACTORS		S-5
USE OF PROCEEDS		S-11
DIVIDEND POLICY		S-12
DILUTION		S-13
MATERIAL U.S. FEDERAL INCOME TAX CONSEQUENCES TO NON-U.S. HOLDERS		S-14
UNDERWRITERS		S-18
LEGAL MATTERS		S-26
EXPERTS		S-27
WHERE YOU CAN FIND MORE INFORMATION; INCORPORATION BY REFERENCE		S-28

	Page
PROSPECTUS
ABOUT THIS PROSPECTUS		1
WHERE YOU CAN FIND MORE INFORMATION; INCORPORATION BY REFERENCE		2
THE COMPANY		4
RISK FACTORS		5
USE OF PROCEEDS		6
DESCRIPTION OF CAPITAL STOCK		7
DESCRIPTION OF DEBT SECURITIES		13
DESCRIPTION OF OTHER SECURITIES		20
GLOBAL SECURITIES		21
PLAN OF DISTRIBUTION		25
LEGAL MATTERS		26
EXPERTS		26

	Three Months Ended June 30, 2025			Three Months Ended June 30, 2026
(in billions)	Actual			Estimated — High			Estimated — Low
Total revenues		$	1.30		$	1.65		$	1.55

	March 31, 2026			June 30, 2026
(in billions)	Actual			Estimated
Cash, cash equivalents, and short-term investments		$	4.8		$	5.3

Public offering price per share			$
Net tangible book value per share as of March 31, 2026	$	3.19
Increase per share attributable to new investors in this offering	$
Adjusted net tangible book value per share			$
Dilution in adjusted net tangible book value per share to new investors in this offering			$

Underwriters	Number of Shares of Class A common stock
Goldman Sachs & Co. LLC
Allen & Company LLC
Barclays Capital Inc.
J.P. Morgan Securities LLC
Morgan Stanley & Co. LLC
Wells Fargo Securities, LLC
Total		75,000,000