Company: ALGN
Filing Date: 2025-08-06
Form Type: S-8
Source: 0001097149-25-000066
Chunk: 1

Company: ALIGN TECHNOLOGY INC
Filing Date: 2025-08-06
Form: S-8
Chunk 1
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 If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 7(a)(2)(B) of the Securities Act. ☐ |     |   |     |                           |     |   |

### EXPLANATORY NOTE
In May 2005, the stockholders of Align Technology, Inc., a Delaware corporation (the “

#### Company
”), approved the Align Technology, Inc. 2005 Incentive Plan (as amended to date, the “

#### 2005 Plan
”). In May 2025, the Company’s stockholders approved an amendment to the 2005 Plan solely to increase the number of shares of common stock, $0.0001 par value per share (“

#### Common Stock
”), reserved for issuance under the 2005 Plan by 2,500,000 shares (the “

#### Additional Shares
”). As a result, the aggregate number of shares of Common Stock reserved for issuance under the 2005 Plan is 34,668,895.

The Additional Shares are securities of the same class as other securities for which Registration Statements on Form S-8 relating to the 2005 Plan were previously filed with the Securities and Exchange Commission (the “

#### SEC
”) on June 7, 2005 ( File No. 333-125586 ), May 25, 2006 ( File No. 333-134477 ), May 29, 2007 ( File No. 333-143319 ), August 5, 2009 ( File No. 333-161054 ), August 5, 2010 ( File No. 333-168548 ), August 8, 2011 ( File No. 333-176134 ), August 2, 2013 ( File No. 333-190351 ), November 8, 2016 ( File No. 333-214493 ) and August 4, 2023 ( File No. 333-273715 ) (the “

#### Prior Registration Statements
”). Pursuant to General Instruction E of Form S-8, the Prior Registration Statements are incorporated by reference into this Registration Statement on Form S-8 (the “

#### Registration Statement
”) .

In accordance with the instructional note to Part I of Form S-8 as promulgated by the SEC, the information specified by Part I of Form S-8 has