Item 5. Market for Registrant’s Common Equity, Related Stockholder Matters and Issuer Purchases of Equity Securities.
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Item 5. Market for Registrant’s Common Equity, Related Stockholder Matters and Issuer Purchases of Equity Securities.
Market Information
Our common stock is traded on the NASDAQ Global Market under the symbol ALGN. As of February 20, 2023, there were approximately 53 holders of record of our common stock. Because the majority of our shares of outstanding common stock are held by brokers and other institutions on behalf of stockholders, we are unable to estimate the total number of stockholders represented by these record holders.
Performance Graph
Notwithstanding any statement to the contrary in any of our previous or future filings with the SEC, the following information relating to the price performance of our common stock shall not be deemed “filed” with the SEC or “Soliciting Material” under the Securities Exchange Act of 1934, as amended, or subject to Regulation 14A or 14C, or to liabilities of Section 18 of the Exchange Act except to the extent we specifically request that such information be treated as soliciting material or to the extent we specifically incorporate this information by reference.
The graph below matches our cumulative 5-year total stockholder return on common stock with the cumulative total returns of the NASDAQ Composite index, the S&P 500 index and the S&P 1500 Composite Health Care Equipment & Supplies index. The graph tracks the performance of a $100 investment in our common stock and each index (with the reinvestment of all dividends) from December 31, 2017 to December 31, 2022.

Unregistered Sales of Equity Securities
None.
Purchases of Equity Securities by the Issuer and Affiliated Purchasers
The following table summarizes the stock repurchase activity for the three months ended December 31, 2022:
| Period | Total Number of Shares Purchased | Average Price Paid per Share | Total Number of Shares Purchased as Part of Publicly Announced Programs | Approximate Dollar Value of Shares that May Yet Be Purchased Under the Programs**(1)** | ||||||||||||||||||||||
| October 1, 2022 through October 31, 2022 | 848,266 | $ | 188.62 | 848,266 | $ | 249,926,094 | ||||||||||||||||||||
| November 1, 2022 through November 30, 2022 | — | $ | — | — | $ | 249,926,094 | ||||||||||||||||||||
| December 1, 2022 through December 31, 2022 | — | $ | — | — | $ | 249,926,094 | ||||||||||||||||||||
| Total | 848,266 | 848,266 |
1 May 2021 Repurchase Program. On May 13, 2021, we announced that our Board of Directors had authorized a plan to repurchase up to $1.0 billion of our common stock. See Note 10 “Common Stock Repurchase Programs” of the Notes to Consolidated Financial Statements for details on the May 2021 Repurchase Program.
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