Filed Pursuant to Rule 424(b)(3)

Registration No. 333-251433

PROSPECTUS SUPPLEMENT

(To Prospectus dated May 18, 2021)

306,053,642 Shares of Class A Common Stock

6,650,000 Warrants

This Prospectus Supplement supplements the prospectus dated May 18, 2021 (as supplemented to date, the “Prospectus”), which forms a part of our Registration Statement on Post-Effective Amendment No. 3 to the Form S-1 (Registration Statement No. 333- 251433) filed with the Securities and Exchange Commission (the “Commission”) on May 17, 2021 and declared effective by the Commission on May 18, 2021.

The Prospectus and this Prospectus Supplement relate to the disposition from time to time of 1) up to 306,053,642 shares of our Class A Common Stock, which include Class A Common Stock issuable upon conversion of our Class B Common Stock, the exercise of certain private placement and public warrants (together, the “Warrants”), the exercise of certain stock options, and the vesting of certain restricted stock units, and 2) up to 6,650,000 private placement warrants, which are held or may be held by the selling securityholders named in the Prospectus. We will not receive any proceeds from the sale of our securities offered by the selling securityholders under the Prospectus. We will receive up to an aggregate of approximately $207,650,336.50 from the exercise of the Warrants assuming the exercise in full of all of the Warrants for cash at a current exercise price of $11.50 per share, less the amount that will not be received due to cashless exercises.

This Prospectus Supplement should be read in conjunction with the Prospectus, which is to be delivered with this Prospectus Supplement. This Prospectus Supplement updates, amends and supplements the information included or incorporated by reference in the Prospectus. If there is any inconsistency between the information in the Prospectus and this Prospectus Supplement, you should rely on the information in this Prospectus Supplement.

This Prospectus Supplement is not complete without, and may not be delivered or utilized except in connection with, the Prospectus, including any amendments or supplements to it.

Current Report on Form 8-K

On August 16, 2021, we filed a Current Report on Form 8-K with the Commission. The portion of the text of such Form 8-K that is treated as “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended, is attached hereto.

Investing in our securities involves a high degree of risk. In reviewing the Prospectus and this Prospectus Supplement, you should carefully consider the matters described under the heading “Risk Factors” beginning on page 6 of the Prospectus.

You should rely only on the information contained in the Prospectus, this Prospectus Supplement or any Prospectus Supplement or amendment hereto. We have not authorized anyone to provide you with different information.

Neither the Securities and Exchange Commission nor any state securities commission has approved or disapproved of these securities or determined if this prospectus is truthful or complete. Any representation to the contrary is a criminal offense.

The date of this prospectus supplement is August 16, 2021.

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d)

of the Securities Exchange Act of 1934

Date of report (Date of earliest event reported): August 16, 2021

QuantumScape Corporation

(Exact Name of Registrant as Specified in Charter)

Delaware	001-39345	85-0796578
(State or other jurisdiction of incorporation)	(Commission File Number)	(I.R.S. Employer Identification Number)

1730 Technology Drive San Jose, California	95110
(Address of principal executive offices)	(Zip code)

(408) 452-2000

(Registrant’s telephone number, including area code)

Not Applicable

(Former name or former address, if changed since last report)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the Registrant under any of the following provisions:

☐ Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

☐ Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

☐ Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

☐ Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Act:

Title of each class	Trading Symbol(s)	Name of each exchange on which registered
Class A common stock, par value $0.0001 per share	QS	The New York Stock Exchange
Redeemable warrants, each whole warrant exercisable for one share of Class A common stock at an exercise price of $11.50	QS.WS	The New York Stock Exchange

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§ 230.405) or Rule 12b-2 of the Securities Exchange Act of 1934 (§ 240.12b-2).

Emerging growth company ☒

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

Item 7.01.   Regulation FD Disclosure.

On August 16, 2021, the Chief Executive Officer of QuantumScape Corporation (the “Company”) posted information for investors via his Twitter account located at https://twitter.com/startupjag.

The Company’s investor relations website is located at https://ir.quantumscape.com, its Company Twitter account is located at https://twitter.com/QuantumScapeCo, its investor relations Twitter account is located at https://twitter.com/QuantumScapeIR, its Chief Executive Officer’s Twitter account is located at https://twitter.com/startupjag, its Chief Technology Officer’s Twitter account is located at https://twitter.com/ironmantimholme and its Chief Marketing Officer’s Twitter account is located at https://twitter.com/HussainAsim. The Company uses its investor relations website and aforementioned Twitter accounts to post important information for investors, including news releases, analyst presentations, and supplemental financial information, and as a means of disclosing material non-public information and for complying with its disclosure obligations under Regulation FD. Accordingly, investors should monitor the Company’s investor relations website, and aforementioned Twitter accounts, in addition to following press releases, filings with the Securities and Exchange Commission (the “SEC”) and public conference calls and webcasts. The Company also makes available, free of charge, on its investor relations website under “Financials—SEC Filings,” our Annual Reports on Form 10-K, Quarterly Reports on Form 10-Q, Current Reports on Form 8-K and amendments to these reports as soon as reasonably practicable after electronically filing or furnishing those reports to the SEC.

The information in Item 7.01 of this Current Report on Form 8-K, and Exhibit 99.1 attached hereto, shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”) or otherwise subject to the liabilities of that section, nor shall it be deemed incorporated by reference in any filing under the Securities Act of 1933, as amended, or the Exchange Act, except as shall be expressly set forth by specific reference in such a filing.

Item 9.01   Financial Statements and Exhibits

(d)    Exhibits

Exhibit No.	Description
99.1	Tweet, dated August 16, 2021.
104	Cover Page Interactive Data File (embedded within the Inline XBRL document)

2

SIGNATURE

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, hereunto duly authorized.

Dated: August 16, 2021

QUANTUMSCAPE CORPORATION
By:	/s/ Michael McCarthy
	Name:	Michael McCarthy
	Title:	Chief Legal Officer and Head of Corporate Development

Exhibit 99.1

Encouraging early ten-layer cell cycling results - now at 200 cycles with >96% capacity retention at 1C/1C and 25 degC, generally in line with what we’ve seen for our single- and four-layer cells

10-Layer Multilayer Cycle Life Charge-Discharge Rate 1C-1C Cathode Loading 3.1mAh/cm2 Current Density 3.1mA/cm3 Temperature 25°C Anode Anode-free Li metal Depth of Discharge 100% Area 70x85mm Pressure ~3.4atm Layers 10 Discharge Capacity [%] 0 20 40 60 80 100 Cycle 0 25 50 75 100 125 150 175 200