Sec Form 4 Filing - RITTICHIER JEFFREY @ EMCORE CORP - 2023-03-23

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 RITTICHIER JEFFREY 2. Issuer Name and Ticker or Trading Symbol EMCORE CORP [ EMKR] 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) 2015 W. CHESTNUT STREET 3. Date of Earliest Transaction (MM/DD/YY) 03/23/2023 (Street) ALHAMBRA, CA91803 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 Restricted Stock Units 03/23/2023 A 217,100 A 683,900 ( 2 ) D Common Stock 03/23/2023 F 19,678 ( 3 ) D $ 1.15 664,222 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 Performance-Based Restricted Stock Units (PSUs) ( 4 ) 03/23/2023 A 217,100 ( 4 ) ( 5 ) ( 5 ) Common Stock 217,100 ( 4 ) $ 0 217,100 ( 4 ) D

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other RITTICHIER JEFFREY 2015 W. CHESTNUT STREET ALHAMBRA, CA91803 X Chief Executive Officer Signatures /s/ Ryan Hochgesang, attorney in fact 03/27/2023 Signature of Reporting Person Date

Explanation of Responses:

( 1 )Each restricted stock unit (RSU) represents a contingent right to receive one share of EMCORE common stock. The RSUs were issued pursuant to the Amended and Restated EMCORE Corporation 2019 Equity Incentive Plan. The RSUs vest as to 1/4 of the underlying shares on each of the first four anniversaries of the grant date, subject to the Reporting Person's continued service with the Issuer through the applicable vesting date. ( 2 )On April 27, 2022, the Reporting Person filed a Form 4 which inadvertently reported that he directly owned 400,134 shares of Common Stock. The Reporting Person directly owned 466,800 shares of Common Stock following the transactions reported on such Form 4. ( 3 )On March 23, 2021, the Reporting Person was granted 130,000 RSUs, vesting in four equal annual installments beginning on the first anniversary of the grant date, which grant was previously reported on a Form 4, Table I. The Reporting Person vested in 32,500 shares on March 23, 2023 from this RSU award. The number of shares reported here represents the number of shares required to be withheld in accordance with Rule 16b-3 to cover the Reporting Person's tax withholding obligation in connection with the vesting of the RSUs on March 23, 2023. ( 4 )Each Performance-Based Restricted Stock Unit (PSU) represents a contingent right to receive one share of EMCORE common stock, based on a threshold average closing share price for EMCORE's common stock, as set by the Compensation Committee of the Board of Directors, during any 30-day period within the three-year period following the grant date. ( 5 )Either zero (0) or 100% of the PSUs will vest, if at all, on March 23, 2026, subject to the Reporting Person's continued service with the Issuer through such date.

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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