Sec Form 4 Filing - Kearney Matthew Joseph @ Mount Rainier Acquisition Corp. - 2021-10-07

FORM 4 Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person Kearney Matthew Joseph 2. Issuer Name and Ticker or Trading Symbol Mount Rainier Acquisition Corp. [ RNER] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) X __ Director _____ 10% Owner X __ Officer (give title below) _____ Other (specify below) Chief Executive Officer (Last) (First) (Middle) C/O MOUNT RAINIER ACQUISITION CORP., 256 W. 38TH STREET, 15TH FLOOR 3. Date of Earliest Transaction (MM/DD/YY) 10/07/2021 (Street) NEW YORK, NY10018 4. If Amendment, Date Original Filed (MM/DD/YY) 6. Individual or Joint/Group Filing (Check Applicable Line) __ X __ Form filed by One Reporting Person _____ Form filed by More than One Reporting Person (City) (State) (Zip)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned 1.Title of Security (Instr. 3) 2. Transaction Date (MM/DD/YY) 2A. Deemed Execution Date, if any (MM/DD/YY) 3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4) Code V Amount (A) or (D) Price Common Stock 10/07/2021 P 10,000 A 346,985 D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned ( e.g. , puts, calls, warrants, options, convertible securities) 1. Title of Derivative Security (Instr. 3) 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (MM/DD/YY) 3A. Deemed Execution Date, if any (MM/DD/YY) 4. Transaction Code (Instr. 8) 5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4, and 5) 6. Date Exercisable and Expiration Date (MM/DD/YY) 7. Title and Amount of Underlying Securities (Instr. 3 and 4) 8. Price of Derivative Security (Instr. 5) 9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4) Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares Warrants to purchase Common Stock $ 11.5 10/07/2021 P 10,000 ( 2 ) ( 3 ) Common Stock 7,500 ( 1 ) 10,000 D

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other Kearney Matthew Joseph C/O MOUNT RAINIER ACQUISITION CORP. 256 W. 38TH STREET, 15TH FLOOR NEW YORK, NY10018 X Chief Executive Officer Signatures By: /s/ Matthew Kearney 10/08/2021 Signature of Reporting Person Date

Explanation of Responses:

( 1 )The securities reported herein are held as units ("Units"), with each Unit consisting of one share of common stock, par value $0.0001 ("Common Stock"), of Mount Rainier Acquisition Corp. (the "Company") and one warrant. Each warrant entitles the holder thereof to purchase three-fourths (3/4) of a share of Common Stock at a price of $11.50 per whole share, subject to adjustment. The Units were purchased for a total price of $100,000, or $10.00 per Unit. ( 2 )Each warrant becomes exercisable on the later of one year after the closing of the Company's initial public offering or 30 days after the completion of an initial business combination. ( 3 )The warrants expire five years after the completion of an initial business combination, or earlier upon redemption, as described in the Company's prospectus filed with the SEC.

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.

* If the form is filed by more than one reporting person, see Instruction 4(b)(v).

** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).

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