Sec Form 4 Filing - TortoiseEcofin Sponsor III LLC @ TortoiseEcofin Acquisition Corp. III - 2021-07-19

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 TortoiseEcofin Sponsor III LLC 2. Issuer Name and Ticker or Trading Symbol TortoiseEcofin Acquisition Corp. III [ TRTL] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director X __ 10% Owner _____ Officer (give title below) _____ Other (specify below) (Last) (First) (Middle) 6363 COLLEGE BOULEVARD 3. Date of Earliest Transaction (MM/DD/YY) 07/19/2021 (Street) OVERLAND PARK, KS66211 4. If Amendment, Date Original Filed (MM/DD/YY) 6. Individual or Joint/Group Filing (Check Applicable Line) _____ Form filed by One Reporting Person __ X __ 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

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 Class B Ordinary Shares ( 1 ) 07/19/2021 J( 2 ) 120,000 ( 1 ) ( 1 ) Class A Ordinary Shares 120,000 $ 0 8,505,000 I See Footnote ( 3 )

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other TortoiseEcofin Sponsor III LLC 6363 COLLEGE BOULEVARD OVERLAND PARK, KS66211 X TortoiseEcofin Borrower LLC 6363 COLLEGE BOULEVARD OVERLAND PARK, KS66211 X TortoiseEcofin Investments, LLC 6363 COLLEGE BOULEVARD OVERLAND PARK, KS66211 X Signatures /s/ TortoiseEcofin Sponsor III LLC, by Steven C. Schnitzer as Attorney-in-Fact 07/21/2021 Signature of Reporting Person Date /s/ TortoiseEcofin Borrower LLC, by Steven C. Schnitzer as Attorney-in-Fact 07/21/2021 Signature of Reporting Person Date /s/ TortoiseEcofin Investments, LLC, by Steven C. Schnitzer as Attorney-in-Fact 07/21/2021 Signature of Reporting Person Date

Explanation of Responses:

( 1 )The Class B Ordinary Shares are convertible into the Issuer's Class A Ordinary Shares on a one-for-one basis, subject to adjustment pursuant to certain anti-dilution rights, and have no expiration date. ( 2 )In connection with the Issuer's initial public offering and the appointment of Juan J. Daboub, William J. Clinton and Mary Beth Mandanas to the Issuer's Board of Directors, TortoiseEcofin Sponsor III forfeited 120,000 Class B Ordinary Shares to the Issuer and the Issuer issued 40,000 Class B Ordinary Shares to each of Juan J. Daboub, William J. Clinton and Mary Beth Mandanas. ( 3 )TortoiseEcofin Sponsor III LLC is the record holder of the shares reported herein. TortoiseEcofin Borrower LLC is the managing member of TortoiseEcofin Sponsor III LLC. TortoiseEcofin Parent Holdco LLC is the sole member of TortoiseEcofin Borrower LLC and TortoiseEcofin Investments, LLC is the sole member of TortoiseEcofin Parent Holdco LLC. Accordingly, TortoiseEcofin Borrower LLC and TortoiseEcofin Investments, LLC may be deemed to have or share beneficial ownership of the Class B Ordinary Shares held directly by TortoiseEcofin Sponsor III LLC. The address of each of TortoiseEcofin Borrower LLC and TortoiseEcofin Investments, LLC is 6363 College Boulevard, Overland Park, Kansas 66211.

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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