Sec Form 3 Filing - Richardson Jaime Holte @ ALIGN TECHNOLOGY INC - 2026-04-14

FORM 3 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 Richardson Jaime Holte 2. Issuer Name and Ticker or Trading Symbol ALIGN TECHNOLOGY INC [ ALGN] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director _____ 10% Owner X __ Officer (give title below) _____ Other (specify below) See Remarks (Last) (First) (Middle) 410 NORTH SCOTTSDALE ROAD, SUITE 1300 3. Date of Earliest Transaction (MM/DD/YY) 04/14/2026 (Street) TEMPE, AZ85288 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 937 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 Restricted Stock Units $ 0.0001 ( 2 ) ( 1 ) ( 1 ) Common Stock 290 D Restricted Stock Units $ 0.0001 ( 2 ) ( 3 ) ( 3 ) Common Stock 579 D Restricted Stock Units $ 0.0001 ( 2 ) ( 4 ) ( 4 ) Common Stock 1,101 D Restricted Stock Units $ 0.0001 ( 2 ) ( 5 ) ( 5 ) Common Stock 2,746 D Market Stock Units $ 0.0001 ( 2 ) ( 6 ) ( 6 ) Common Stock 5,576 D

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other Richardson Jaime Holte 410 NORTH SCOTTSDALE ROAD SUITE 1300 TEMPE, AZ85288 See Remarks Signatures /s/ Julie Ann Coletti, Attorney-in-Fact for Jaime Holte Richardson 04/14/2026 Signature of Reporting Person Date

Explanation of Responses:

( 1 )On February 20, 2023, the reporting person received an award of 1,160 restricted stock units ("RSU"s), vesting 25% on each anniversary of the grant date. The remaining 290 unvested shares will vest in full on February 20, 2027, and shares will be delivered to the reporting person on such vesting date. ( 2 )Represents par value of ALGN common stock. ( 3 )On February 20, 2024, the reporting person received an award of 1,159 RSUs, vesting 25% on each anniversary of the grant date. The remaining 579 unvested shares will vest in equal installments on February 20, 2027 and February 20, 2028, and shares will be delivered to the reporting person on each such vesting date. ( 4 )On February 20, 2025, the reporting person received an award of 1,469 RSUs, vesting 25% on each anniversary of the grant date. The remaining 1,101 unvested shares will vest in equal installments on February 20, 2027, February 20, 2028 and February 20, 2029, and shares will be delivered to the reporting person on each such vesting date. ( 5 )On February 20, 2026, the reporting person received an award of 2,746 RSUs, vesting 25% on each anniversary of the grant date, and shares will be delivered to the reporting person on each such vesting date. ( 6 )Represents the number of shares which may be issued at target pursuant to the market stock units granted on February 20, 2026. If performance exceeds target, the maximum number of shares that may vest is 250% of the at target amount. Vesting, if any, of the market stock units occurs on the last day of the third year of the Performance Period (as defined in the market stock unit agreement).

Remarks: The reporting person is Executive Vice President, Global Human Resources. Exhibit List- 24- Limited Power of Attorney

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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