Sec Form 4 Filing - Aquino Melissa @ IDEX CORP /DE/ - 2023-01-04

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 Aquino Melissa 2. Issuer Name and Ticker or Trading Symbol IDEX CORP /DE/ [ IEX] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director _____ 10% Owner X __ Officer (give title below) _____ Other (specify below) Former SVP, Group Exec FMT&FSD (Last) (First) (Middle) 3100 SANDERS ROAD, SUITE 301 3. Date of Earliest Transaction (MM/DD/YY) 01/04/2023 (Street) NORTHBROOK, IL60062 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 01/04/2023 D( 1 ) 12,895 D $ 0 0 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 OPTIONS (RIGHT TO BUY) $ 203.58 01/04/2023 D( 1 ) V 15,770 10/17/2023( 2 ) 10/17/2032 COMMON STOCK 15,770 $ 0 0 D

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other Aquino Melissa 3100 SANDERS ROAD SUITE 301 NORTHBROOK, IL60062 Former SVP, Group Exec FMT&FSD Signatures Melissa Aquino 01/04/2023 Signature of Reporting Person Date

Explanation of Responses:

( 1 )In connection with the Reporting Person's resignation as an officer of the Issuer effective January 4, 2023, these unvested shares of restricted stock and unvested stock options were forfeited back to the Issuer. The forfeiture of the stock options is exempt from reporting under Section 16 of the Exchange Act pursuant to Rule 16a-4(d), but is being voluntarily reported herein for transparency. ( 2 )The options would have vested in four equal installments beginning October 17, 2023

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).

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