Biggest changeDecember 31, 2017 December 31, 2018 December 31, 2019 December 31, 2020 December 31, 2021 December 31, 2022 Qualys, Inc. $ 100.00 $ 125.93 $ 140.47 $ 205.34 $ 231.20 $ 189.10 NASDAQ Global Select Market $ 100.00 $ 96.32 $ 130.62 $ 186.83 $ 230.03 $ 155.00 NASDAQ Computer $ 100.00 $ 96.32 $ 144.80 $ 217.17 $ 299.39 $ 192.28 S&P 500 $ 100.00 $ 95.62 $ 125.72 $ 148.85 $ 191.58 $ 156.88 The information on the above Stock Price Performance Graph shall not be deemed to be “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended, or otherwise subject to the liabilities of that section or Sections 11 and 12(a)(2) of the Securities Act of 1933, as amended, and shall not be incorporated by reference into any registration statement or other document filed by us with the SEC, whether made before or after the date of this Annual Report on Form 10-K, regardless of any general incorporation language in such filing, except as shall be expressly set forth by specific reference in such filing. 38 Table of Contents Purchases of Equity Securities by the Issuer and Affiliated Purchasers A summary of our repurchases of common stock during the three months ended December 31, 2022 is as follows: Period Total Number of Shares Purchased Average Price Paid per Share Total Number of Shares Purchased as Part of Publicly Announced Plan or Program (1) Approximate Dollar Value of Shares that May Yet Be Purchased under the Plan or Program October 1, 2022 - October 31, 2022 231,057 $ 136.68 231,057 $ 227,405,137 November 1, 2022 - November 30, 2022 285,100 $ 121.98 285,100 $ 192,628,215 December 1, 2022 - December 31, 2022 331,441 $ 115.09 331,441 $ 154,481,340 (2) Total 847,598 847,598 (1) On February 5, 2018, our board of directors authorized a $100.0 million share repurchase program, which was announced on February 12, 2018.
Biggest changeDecember 31, 2018 December 31, 2019 December 31, 2020 December 31, 2021 December 31, 2022 December 31, 2023 Qualys, Inc. $ 100.00 $ 111.55 $ 163.06 $ 183.60 $ 150.16 $ 262.62 NASDAQ Global Select Market $ 100.00 $ 135.60 $ 193.97 $ 238.82 $ 160.92 $ 233.41 NASDAQ Computer $ 100.00 $ 150.34 $ 225.48 $ 310.84 $ 199.64 $ 322.34 S&P 500 $ 100.00 $ 131.49 $ 155.68 $ 200.37 $ 164.08 $ 207.21 The information on the above Stock Price Performance Graph shall not be deemed to be “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended, or otherwise subject to the liabilities of that section or Sections 11 and 12(a)(2) of the Securities Act of 1933, as amended, and shall not be incorporated by reference into any registration statement or other document filed by us with the SEC, whether made before or after the date of this Annual Report on Form 10-K, regardless of any general incorporation language in such filing, except as shall be expressly set forth by specific reference in such filing. 41 Table of Contents Purchases of Equity Securities by the Issuer and Affiliated Purchasers A summary of our repurchases of common stock during the three months ended December 31, 2023 is as follows: Period Total Number of Shares Purchased Average Price Paid per Share Total Number of Shares Purchased as Part of Publicly Announced Plan or Program (1) Approximate Dollar Value of Shares that May Yet Be Purchased under the Plan or Program October 1, 2023 - October 31, 2023 76,000 $ 156.94 76,000 $ 94,828,514 November 1, 2023 - November 30, 2023 49,112 $ 171.10 49,112 $ 86,425,300 December 1, 2023 - December 31, 2023 14,400 $ 190.51 14,400 $ 83,681,929 (2) Total 139,512 139,512 (1) On February 12, 2018, we announced that our board of directors authorized a $100.0 million share repurchase program.
Such returns are based on historical results and are not intended to suggest future performance. COMPARISON OF CUMULATIVE TOTAL RETURN* Among Qualys, Inc., NASDAQ-Global Select Market Composite Index, and NASDAQ Computer Index and S&P 500 Index * $100 invested on December 31, 2017 in stock or index, including reinvestment of dividends. Fiscal year ending December 31.
Such returns are based on historical results and are not intended to suggest future performance. 40 Table of Contents COMPARISON OF CUMULATIVE TOTAL RETURN* Among Qualys, Inc., NASDAQ-Global Select Market Composite Index, and NASDAQ Computer Index and S&P 500 Index * $100 invested on December 31, 2018 in stock or index, including reinvestment of dividends. Fiscal year ending December 31.
On each of October 30, 2018, October 30, 2019, May 7, 2020 and February 10, 2021, we announced that our board of directors had authorized an increase of $100.0 million, and on each of November 3, 2021 and May 4, 2022, we announced that our board of directors had authorized an increase of $200.0 million to the share repurchase program, resulting in an aggregate authorization of $900.0 million as of December 31, 2022.
On each of October 30, 2018, October 30, 2019, May 7, 2020, February 10, 2021 and February 9, 2023, we announced that our board of directors had authorized an increase of $100.0 million, and on each of November 3, 2021 and May 4, 2022, we announced that our board of directors had authorized an increase of $200.0 million to the share repurchase program, resulting in an aggregate authorization of $1.0 billion as of December 31, 2023.
Item 5. Market for Registrant's Common Equity, Related Stockholder Matters and Issuer Purchases of Equity Securities Market Information Our common stock is listed and traded on the Nasdaq Global Select Market under the symbol “QLYS”. Holders of Record As of February 14, 2023, there were approximately 52 holders of record of our common stock.
Item 5. Market for Registrant's Common Equity, Related Stockholder Matters and Issuer Purchases of Equity Securities Market Information Our common stock is listed and traded on the NASDAQ Global Select Market under the symbol “QLYS”. Holders of Record As of February 12, 2024, there were approximately 48 holders of record of our common stock.
(4) Consists of 2,351 thousand shares reserved for issuance under our Restated 2012 Plan and 555 thousand shares reserved for issuance under our 2021 ESPP. 37 Table of Contents Stock Price Performance Graph The following graph shows a comparison from December 31, 2017 through December 31, 2022 of the cumulative total return for an investment of $100 (and the reinvestment of dividends) in our common stock, the NASDAQ Global Select Market Composite Index and the NASDAQ Computer Index and the S&P 500 Index.
Stock Price Performance Graph The following graph shows a comparison from December 31, 2018 through December 31, 2023 of the cumulative total return for an investment of $100 (and the reinvestment of dividends) in our common stock, the NASDAQ Global Select Market Composite Index and the NASDAQ Computer Index and the S&P 500 Index.
Our share repurchase program does not have an expiration date. (2) Does not reflect the $100.0 million increase to our share repurchase program announced on February 9, 2023.
Our share repurchase program does not have an expiration date. (2) Does not reflect the $200.0 million increase to our share repurchase program announced on February 7, 2024. Item 6. [RESERVED] 42 Table of Contents