股本结构
单位：万股
| 公告日期 | 2025-10-31 | 2025-10-31 | 2025-08-01 | 2025-08-01 | 2025-05-02 | 2025-05-02 |
|---|---|---|---|---|---|---|
| 证券总股本 | 2137.37 | 2135.52 | 2131.42 | 2117.30 | 2109.15 | 2113.26 |
| 普通股本 | 2137.37 | 2135.52 | 2131.42 | 2117.30 | 2109.15 | 2113.26 |
| 优先股 | 未披露 | 未披露 | 未披露 | 未披露 | 未披露 | 未披露 |
| 其他 | 未披露 | 未披露 | 未披露 | 未披露 | 未披露 | 未披露 |
| 变动日期 | 2025-10-28 | 2025-09-30 | 2025-07-28 | 2025-06-30 | 2025-04-28 | 2025-03-31 |
注释：中概股证券总股本=普通股股本/
存托凭证比例
历史变动
| 公告日期 | 变动后普通股本（万股） | 变动后优先股（万股） | 变动原因 | 变动日期 |
|---|---|---|---|---|
| 2025-10-31 | 2137.37 | 未披露 | 定期报告 | 2025-10-28 |
| 2025-10-31 | 2135.52 | 未披露 |
更多>>
From June 30, 2025 to September 30, 2025
Exercise of common stock options
Issuance of unrestricted stock
|
2025-09-30 |
| 2025-08-01 | 2131.42 | 未披露 | 定期报告 | 2025-07-28 |
| 2025-08-01 | 2117.30 | 未披露 |
更多>>
From March 31, 2025 to June 30, 2025
Issuance of unrestricted stock
Shares surrendered by employees to pay taxes related to unrestricted stock
Issuance of common stock under employee stock purchase plan
Repurchase of common stock
|
2025-06-30 |
| 2025-05-02 | 2109.15 | 未披露 | 定期报告 | 2025-04-28 |
| 2025-04-25 | 2109.71 | 未披露 | 定期报告 | 2025-04-15 |
| 2025-05-02 | 2113.26 | 未披露 |
更多>>
From December 31, 2024 to March 31, 2025
Issuance of unrestricted stock
Repurchase of common stock
|
2025-03-31 |
| 2025-03-13 | 2109.66 | 未披露 |
更多>>
From December 31, 2023 to December 31, 2024
Issuance of common stock under employee stock purchase plan
Issuance of unrestricted stock
Repurchase of common stock
Shares surrendered by employees to pay taxes related to unrestricted stock
|
2024-12-31 |
| 2024-11-01 | 2120.39 | 未披露 | 定期报告 | 2024-10-28 |
| 2024-11-01 | 2119.41 | 未披露 |
更多>>
From June 30, 2024 to September 30, 2024
Issuance of unrestricted stock
Shares surrendered by employees to pay taxes related to unrestricted stock
|
2024-09-30 |
| 2024-08-09 | 2118.36 | 未披露 | 定期报告 | 2024-07-31 |
| 2024-08-09 | 2111.32 | 未披露 |
更多>>
From March 31, 2024 to June 30, 2024
Issuance of common stock under employee stock purchase plan
|
2024-06-30 |
| 2024-05-03 | 2108.52 | 未披露 |
更多>>
From December 31, 2023 to March 31, 2024
Issuance of unrestricted stock
|
2024-03-31 |
| 2024-03-15 | 2108.50 | 未披露 | 定期报告 | 2024-03-01 |
| 2024-03-15 | 2101.79 | 未披露 |
更多>>
From December 31, 2022 to December 31, 2023
Repurchase of common stock
Shares surrendered by employees to pay taxes related to unrestricted stock
Issuance of common stock under employee stock purchase plan
Issuance of unrestricted stock
|
2023-12-31 |
| 2023-11-30 | 2099.08 | 未披露 | 定期报告 | 2023-11-08 |
| 2023-11-03 | 2099.17 | 未披露 | 定期报告 | 2023-10-24 |
| 2023-11-03 | 2101.43 | 未披露 |
更多>>
From June 30, 2023 to September 30, 2023
Issuance of unrestricted stock
Repurchase of common stock
|
2023-09-30 |
| 2023-08-02 | 2106.03 | 未披露 | 定期报告 | 2023-07-24 |
| 2023-08-02 | 2099.32 | 未披露 |
更多>>
from March 31, 2023 to June 30, 2023
Issuance of common stock under employee stock purchase plan
|
2023-06-30 |
| 2023-05-03 | 2095.53 | 未披露 |
更多>>
From December 31, 2022 to March 31, 2023
Issuance of unrestricted stock
Repurchase of common stock
Shares surrendered by employees to pay taxes related to unrestricted stock
|
2023-03-31 |
| 2023-03-15 | 2099.39 | 未披露 | 定期报告 | 2023-03-01 |
| 2023-03-15 | 2109.34 | 未披露 |
更多>>
From December 31, 2021 to December 31, 2022
Issuance of unrestricted stock
Shares surrendered by employees to pay taxes related to unrestricted stock
Issuance of common stock under employee stock purchase plan
Repurchase of common stock
|
2022-12-31 |
| 2022-10-28 | 2165.59 | 未披露 | 定期报告 | 2022-10-19 |
| 2022-10-28 | 2168.65 | 未披露 | 定期报告 | 2022-09-30 |
| 2022-07-29 | 2173.46 | 未披露 | 定期报告 | 2022-07-22 |
| 2022-07-29 | 2168.06 | 未披露 |
更多>>
From March 31, 2022 to June 30, 2022
Issuance of common stock under employee stock purchase plan
Repurchase of common stock
|
2022-06-30 |
| 2022-04-27 | 2164.23 | 未披露 |
更多>>
From December 31, 2021 to March 31, 2022
Issuance of unrestricted stock
|
2022-03-31 |
| 2022-03-15 | 2164.23 | 未披露 | 定期报告 | 2022-03-01 |
| 2022-03-15 | 2161.40 | 未披露 |
更多>>
From December 31, 2020 to December 31, 2021
Issuance of unrestricted stock
Shares surrendered by employees to pay taxes related to unrestricted stock
Issuance of common stock under employee stock purchase plan
|
2021-12-31 |
| 2021-10-27 | 2155.95 | 未披露 | 定期报告 | 2021-10-22 |
| 2021-10-27 | 2154.95 | 未披露 |
更多>>
From June 30, 2021 to September 30, 2021
Issuance of unrestricted stock
|
2021-09-30 |
| 2021-07-28 | 2152.95 | 未披露 | 定期报告 | 2021-07-23 |
| 2021-07-28 | 2150.12 | 未披露 |
更多>>
From March 31, 2021 to June 30, 2021
Issuance of common stock under employee stock purchase plan
|
2021-06-30 |
| 2021-04-28 | 2149.42 | 未披露 |
更多>>
From December 31, 2020 To March 22, 2021
Issuance of unrestricted stock
Shares surrendered by employees to pay taxes related to unrestricted stock
|
2021-03-22 |
| 2021-02-17 | 2149.42 | 未披露 | 定期报告 | 2021-02-12 |
| 2021-02-17 | 2137.88 | 未披露 |
更多>>
From December 31,2019 to December 31,2020
Issuance of unrestricted stock
Shares surrendered by employees to pay taxes related to unrestricted stock
Repurchase of common stock
Issuance of common stock under employee stock purchase plan
|
2020-12-31 |
| 2020-10-30 | 2144.73 | 未披露 | 定期报告 | 2020-10-28 |
| 2020-10-30 | 2143.73 | 未披露 |
更多>>
From June 30, 2020 to September 30, 2020
Issuance of unrestricted stock
Shares surrendered by employees to pay taxes related to unrestricted stock
Repurchase of common stock
|
2020-09-30 |
| 2020-07-31 | 2150.02 | 未披露 | 定期报告 | 2020-07-27 |
| 2020-07-31 | 2139.05 | 未披露 |
更多>>
From March 31, 2020 to June 30, 2020
Issuance of common stock under employee stock purchase plan
Repurchase of common stock
|
2020-06-30 |
| 2020-05-01 | 2152.19 | 未披露 |
更多>>
From December 31, 2019 to March 31, 2020
Issuance of unrestricted stock
Shares surrendered by employees to pay taxes related to unrestricted stock
|
2020-03-31 |
| 2020-02-18 | 2152.19 | 未披露 | 定期报告 | 2020-02-12 |
| 2020-02-18 | 2144.28 | 未披露 |
更多>>
from December 31, 2018 to December 31, 2019
Exercise of common stock options
Performance share award
Issuance of unrestricted stock
Shares surrendered by employees to pay taxes related to unrestricted stock
Issuance of common stock under employee stock purchase plan
Repurchase of common stock
|
2019-12-31 |
| 2019-11-01 | 2148.92 | 未披露 | 定期报告 | 2019-10-28 |
| 2019-11-01 | 2147.92 | 未披露 |
更多>>
from June 30, 2019 to September 30, 2019
Performance share award
Issuance of unrestricted stock
Shares surrendered by employees to pay taxes related to unrestricted stock
Repurchase of common stock
|
2019-09-30 |
| 2019-08-02 | 2157.27 | 未披露 | 定期报告 | 2019-07-29 |
| 2019-08-02 | 2151.42 | 未披露 |
更多>>
from March 31, 2019 to June 30, 2019
Exercise of common stock options
Issuance of common stock under employee stock purchase plan
Repurchase of common stock
|
2019-06-30 |
| 2019-05-03 | 2155.14 | 未披露 |
更多>>
from December 31, 2018 to March 31, 2019
Issuance of unrestricted stock
Shares surrendered by employees to pay taxes related to unrestricted stock
Repurchase of common stock
|
2019-03-31 |
| 2019-02-19 | 2157.12 | 未披露 | 定期报告 | 2019-02-11 |
| 2019-02-19 | 2151.59 | 未披露 |
更多>>
from December 31, 2017 to December 31, 2018
Issuance of unrestricted stock
Shares surrendered by employees to pay taxes related to unrestricted stock
Issuance of common stock under employee stock purchase plan
Repurchase of common stock
|
2018-12-31 |
| 2018-10-26 | 2154.51 | 未披露 | 定期报告 | 2018-09-30 |
| 2018-07-27 | 2157.77 | 未披露 | 定期报告 | 2018-07-23 |
| 2018-07-27 | 2152.01 | 未披露 | 定期报告 | 2018-06-30 |
| 2018-04-27 | 2154.68 | 未披露 | 定期报告 | 2018-03-31 |
| 2018-02-28 | 2154.68 | 未披露 | 定期报告 | 2018-02-14 |
| 2018-02-28 | 2149.34 | 未披露 |
更多>>
from December 31, 2016 to December 31, 2017
Exercise of common stock options
Issuance of unrestricted stock
Shares surrendered by employees to pay taxes related to unrestricted stock
Issuance of common stock under employee stock purchase plan
Repurchase of common stock
|
2017-12-31 |
| 2017-10-27 | 2161.26 | 未披露 | 定期报告 | 2017-09-30 |
| 2017-07-28 | 2172.92 | 未披露 | 定期报告 | 2017-07-24 |
| 2017-07-28 | 2167.51 | 未披露 | 定期报告 | 2017-06-30 |
| 2017-04-28 | 2183.76 | 未披露 | 定期报告 | 2017-03-31 |
| 2017-02-10 | 2243.13 | 未披露 | 定期报告 | 2017-02-03 |
| 2017-02-10 | 2237.07 | 未披露 |
更多>>
from December 31, 2015 to December 31, 2016
Issuance of unrestricted stock
Shares surrendered by employees to pay taxes related to unrestricted stock
Issuance of common stock under employee stock purchase plan
Repurchase of common stock
|
2016-12-31 |
| 2016-10-27 | 2263.00 | 未披露 | 定期报告 | 2016-09-30 |
| 2016-07-27 | 2297.55 | 未披露 | 定期报告 | 2016-07-22 |
| 2016-07-27 | 2291.66 | 未披露 | 定期报告 | 2016-06-30 |
| 2016-04-27 | 2299.31 | 未披露 | 定期报告 | 2016-03-31 |
| 2016-02-12 | 2299.31 | 未披露 | 定期报告 | 2016-02-05 |
| 2016-02-12 | 2293.60 | 未披露 |
更多>>
from December 31, 2014 to December 31, 2015
Issuance of unrestricted stock
Shares surrendered by employees to pay taxes related to unrestricted stock
Issuance of common stock under employee stock purchase plan
|
2015-12-31 |
| 2015-10-27 | 2292.99 | 未披露 | 定期报告 | 2015-09-30 |
| 2015-07-28 | 2292.99 | 未披露 | 定期报告 | 2015-07-22 |
| 2015-07-28 | 2287.10 | 未披露 | 定期报告 | 2015-06-30 |
| 2015-04-24 | 2286.56 | 未披露 | 定期报告 | 2015-03-31 |
| 2015-02-13 | 2286.56 | 未披露 | 定期报告 | 2015-02-05 |
| 2015-02-13 | 2280.88 | 未披露 |
更多>>
From December 31, 2013 to December 31, 2014
Exercise of common stock options
Issuance of unrestricted stock
Shares surrendered by employees to pay taxes related to unrestricted stock
Issuance of common stock under employee stock purchase plan
|
2014-12-31 |
| 2014-10-24 | 2280.47 | 未披露 | 定期报告 | 2014-09-30 |
| 2014-07-25 | 2280.30 | 未披露 | 定期报告 | 2014-07-21 |
| 2014-07-25 | 2267.21 | 未披露 | 定期报告 | 2014-06-30 |
| 2014-04-28 | 2262.75 | 未披露 | 定期报告 | 2014-04-18 |
| 2014-04-28 | 2262.74 | 未披露 | 定期报告 | 2014-03-31 |
| 2014-02-18 | 2262.44 | 未披露 | 定期报告 | 2014-02-07 |
| 2014-02-18 | 2257.43 | 未披露 |
更多>>
from December 31, 2012 to December 31, 2013
Issuance of common stock under employee stock purchase plan
Shares surrendered by employees to pay taxes related to unrestricted stock
Issuance of unrestricted stock
Exercise of common stock options
|
2013-12-31 |
| 2013-10-29 | 2257.08 | 未披露 | 定期报告 | 2013-09-30 |
| 2013-07-26 | 2257.07 | 未披露 | 定期报告 | 2013-07-22 |
| 2013-07-26 | 2251.94 | 未披露 | 定期报告 | 2013-06-30 |
| 2013-04-12 | 2251.55 | 未披露 | 定期报告 | 2013-04-04 |
| 2013-04-29 | 2251.40 | 未披露 | 定期报告 | 2013-03-31 |
| 2013-02-19 | 2250.95 | 未披露 |
更多>>
from December 31, 2011 to December 31, 2012
Exercise of common stock options
Issuance of unrestricted stock
Shares surrendered by employees to pay taxes related to unrestricted stock
Issuance of common stock under employee stock purchase plan
|
2012-12-31 |
| 2012-10-31 | 2235.68 | 未披露 |
更多>>
from December 31, 2011 to September 30, 2012
Exercise of common stock options
Issuance of unrestricted stock
Shares surrendered by employees to pay taxes related to unrestricted stock
Issuance of common stock under employee stock purchase plan
|
2012-09-30 |
| 2012-08-02 | 2232.87 | 未披露 | 定期报告 | 2012-07-25 |
| 2012-08-02 | 2226.04 | 未披露 |
更多>>
from December 31, 2011 to June 30, 2012
Exercise of common stock options
Issuance of unrestricted stock
Shares surrendered by employees to pay taxes related to unrestricted stock
Issuance of common stock under employee stock purchase plan
|
2012-06-30 |
| 2012-05-03 | 2112.92 | 未披露 | 定期报告 | 2012-04-27 |
| 2012-05-03 | 2078.55 | 未披露 | 定期报告 | 2012-03-31 |
| 2012-02-21 | 2070.03 | 未披露 | 定期报告 | 2012-02-10 |
| 2012-02-21 | 2062.29 | 未披露 |
更多>>
from December 31, 2010 to December 31, 2011
Exercise of common stock options
Issuance of unrestricted stock
Shares surrendered by employees to pay taxes related to unrestricted stock
Repurchase of common stock
Issuance of common stock under employee stock purchase plan
|
2011-12-31 |
| 2011-10-27 | 2058.29 | 未披露 | 定期报告 | 2011-09-30 |
| 2011-07-27 | 2057.37 | 未披露 | 定期报告 | 2011-07-22 |
| 2011-07-27 | 2076.77 | 未披露 | 定期报告 | 2011-06-30 |
| 2011-04-27 | 2056.73 | 未披露 | 定期报告 | 2011-04-22 |
| 2011-04-27 | 2029.84 | 未披露 | 定期报告 | 2011-03-31 |
| 2011-02-11 | 2018.38 | 未披露 | 定期报告 | 2011-02-04 |
| 2011-02-11 | 2004.19 | 未披露 |
更多>>
Exercise of common stock options
Issuance of unrestricted stock under a stock option exchange program
Shares surrendered by employees to pay taxes related to unrestricted stock
Issuance of unrestricted stock
Issuance of common stock under employee stock purchase plan
|
2010-12-31 |
| 2010-10-29 | 2003.91 | 未披露 | 定期报告 | 2010-10-25 |
| 2010-07-28 | 1992.80 | 未披露 | 定期报告 | 2010-07-26 |
| 2010-04-29 | 1992.70 | 未披露 | 定期报告 | 2010-04-26 |
| 2010-02-12 | 1992.70 | 未披露 | 定期报告 | 2010-02-05 |
| 2010-02-12 | 1980.93 | 未披露 |
更多>>
from December 31, 2008 to December 31, 2009
Issuance of unrestricted stock
Repurchase of common stock
Issuance of common stock under employee stock purchase plan
|
2009-12-31 |
| 2009-02-13 | 2328.12 | 未披露 |
更多>>
from December 31, 2007 to December 31, 2008
Exercise of common stock options
Repurchase of common stock
|
2008-12-31 |
| 2008-02-15 | 2386.37 | 未披露 | 定期报告 | 2008-02-05 |
| 2008-02-15 | 2385.47 | 未披露 |
更多>>
from December 31, 2006 to December 31, 2007
Exercise of common stock options
Repurchase of common stock
Issuance of unrestricted stock
Shares surrendered by employees to pay taxes related to unrestricted stock
|
2007-12-31 |
| 2007-03-14 | 2367.36 | 未披露 | 定期报告 | 2007-03-05 |
| 2007-03-14 | 2364.28 | 未披露 |
更多>>
from December 31, 2005 to December 31, 2006
Exercise of common stock options
Issuance of unrestricted stock
Issuance of common stock under employee stock purchase plan
|
2006-12-31 |
| 2006-03-14 | 2329.08 | 未披露 | 定期报告 | 2006-03-06 |
| 2006-03-14 | 2328.16 | 未披露 |
更多>>
from December 31, 2004 to December 31, 2005
Exercise of common stock options
Issuance of common stock under employee stock purchase plan
|
2005-12-31 |
| 2005-03-16 | 2297.69 | 未披露 | 定期报告 | 2005-03-04 |
| 2005-03-16 | 2290.88 | 未披露 |
更多>>
from December 31, 2003 to December 31, 2004
Exercise of common stock options
Issuance of common stock under employee stock purchase plan
|
2004-12-31 |
| 2004-03-15 | 2275.03 | 未披露 |
更多>>
from December 31, 2002 to December 31, 2003
Exercise of common stock options
Issuance of common stock under employee stock purchase plan
|
2003-12-31 |
| 2003-03-27 | 2269.82 | 未披露 |
更多>>
from December 31, 2001 to December 31, 2002
Exercise of common stock options
Issuance of common stock under employee stock purchase plan
|
2002-12-31 |
| 2002-03-20 | 2266.70 | 未披露 | 定期报告 | 2002-03-12 |
| 2002-03-20 | 2265.77 | 未披露 |
更多>>
from December 31, 2000 to December 31, 2001
Exercise of common stock options
Issuance of common stock under employee stock purchase plan
|
2001-12-31 |
| 2001-03-28 | 2261.83 | 未披露 | 定期报告 | 2001-03-12 |
| 2001-03-28 | 2260.63 | 未披露 |
更多>>
from December 31, 1999 to December 31, 2000
Exercise of common stock options
Issuance of common stock under employee stock purchase plan
|
2000-12-31 |
| 2000-03-28 | 2239.62 | 未披露 | 定期报告 | 2000-02-29 |
| 2000-03-28 | 2191.81 | 未披露 |
更多>>
from December 31, 1998 to December 31, 1999
Exercise of common stock options
Issuance of common stock under employee stock purchase plan
|
1999-12-31 |
| 1999-03-30 | 2117.35 | 未披露 | 定期报告 | 1999-02-26 |
| 1999-03-30 | 2091.14 | 未披露 |
更多>>
from December 31, 1997 to December 31, 1998
Exercise of common stock options,1,258,171 shares
Issuance of common stock under employee stock purchase plan , 7,193 shares
Retirement of treasury stock
|
1998-12-31 |
| 1998-03-30 | 1977.47 | 未披露 | 定期报告 | 1998-02-27 |
| 1998-03-30 | 1964.60 | 未披露 |
更多>>
from December 31, 1996 to December 31, 1997
Exercise of common stock options,686,127 shares
|
1997-12-31 |
| 1997-03-28 | 1911.66 | 未披露 | 定期报告 | 1997-02-28 |
| 1997-03-28 | 1895.99 | 未披露 |
更多>>
from December 31, 1995 to December 31, 1996
Conversion of preferred stock to common stock, 12,799,800 shares
Issuance of common stock in initial public offering, net of issuance costs, 3,910,000 shares
Exercise of common stock options,1,083,162 shares
|
1996-12-31 |
| 1997-03-28 | 116.70 | 12.80 |
更多>>
from December 31, 1994 to December 31, 1995
Repurchase of Series D preferred stock, 4,100 shares
Exercise of common stock options, 16,867 shares
|
1995-12-31 |
From June 30, 2025 to September 30, 2025
Exercise of common stock options
Issuance of unrestricted stock
From March 31, 2025 to June 30, 2025
Issuance of unrestricted stock
Shares surrendered by employees to pay taxes related to unrestricted stock
Issuance of common stock under employee stock purchase plan
Repurchase of common stock
From December 31, 2024 to March 31, 2025
Issuance of unrestricted stock
Repurchase of common stock
From December 31, 2023 to December 31, 2024
Issuance of common stock under employee stock purchase plan
Issuance of unrestricted stock
Repurchase of common stock
Shares surrendered by employees to pay taxes related to unrestricted stock
From June 30, 2024 to September 30, 2024
Issuance of unrestricted stock
Shares surrendered by employees to pay taxes related to unrestricted stock
From March 31, 2024 to June 30, 2024
Issuance of common stock under employee stock purchase plan
From December 31, 2023 to March 31, 2024
Issuance of unrestricted stock
From December 31, 2022 to December 31, 2023
Repurchase of common stock
Shares surrendered by employees to pay taxes related to unrestricted stock
Issuance of common stock under employee stock purchase plan
Issuance of unrestricted stock
From June 30, 2023 to September 30, 2023
Issuance of unrestricted stock
Repurchase of common stock
from March 31, 2023 to June 30, 2023
Issuance of common stock under employee stock purchase plan
From December 31, 2022 to March 31, 2023
Issuance of unrestricted stock
Repurchase of common stock
Shares surrendered by employees to pay taxes related to unrestricted stock
From December 31, 2021 to December 31, 2022
Issuance of unrestricted stock
Shares surrendered by employees to pay taxes related to unrestricted stock
Issuance of common stock under employee stock purchase plan
Repurchase of common stock
From March 31, 2022 to June 30, 2022
Issuance of common stock under employee stock purchase plan
Repurchase of common stock
From December 31, 2021 to March 31, 2022
Issuance of unrestricted stock
From December 31, 2020 to December 31, 2021
Issuance of unrestricted stock
Shares surrendered by employees to pay taxes related to unrestricted stock
Issuance of common stock under employee stock purchase plan
From June 30, 2021 to September 30, 2021
Issuance of unrestricted stock
From March 31, 2021 to June 30, 2021
Issuance of common stock under employee stock purchase plan
From December 31, 2020 To March 22, 2021
Issuance of unrestricted stock
Shares surrendered by employees to pay taxes related to unrestricted stock
From December 31,2019 to December 31,2020
Issuance of unrestricted stock
Shares surrendered by employees to pay taxes related to unrestricted stock
Repurchase of common stock
Issuance of common stock under employee stock purchase plan
From June 30, 2020 to September 30, 2020
Issuance of unrestricted stock
Shares surrendered by employees to pay taxes related to unrestricted stock
Repurchase of common stock
From March 31, 2020 to June 30, 2020
Issuance of common stock under employee stock purchase plan
Repurchase of common stock
From December 31, 2019 to March 31, 2020
Issuance of unrestricted stock
Shares surrendered by employees to pay taxes related to unrestricted stock
from December 31, 2018 to December 31, 2019
Exercise of common stock options
Performance share award
Issuance of unrestricted stock
Shares surrendered by employees to pay taxes related to unrestricted stock
Issuance of common stock under employee stock purchase plan
Repurchase of common stock
from June 30, 2019 to September 30, 2019
Performance share award
Issuance of unrestricted stock
Shares surrendered by employees to pay taxes related to unrestricted stock
Repurchase of common stock
from March 31, 2019 to June 30, 2019
Exercise of common stock options
Issuance of common stock under employee stock purchase plan
Repurchase of common stock
from December 31, 2018 to March 31, 2019
Issuance of unrestricted stock
Shares surrendered by employees to pay taxes related to unrestricted stock
Repurchase of common stock
from December 31, 2017 to December 31, 2018
Issuance of unrestricted stock
Shares surrendered by employees to pay taxes related to unrestricted stock
Issuance of common stock under employee stock purchase plan
Repurchase of common stock
from December 31, 2016 to December 31, 2017
Exercise of common stock options
Issuance of unrestricted stock
Shares surrendered by employees to pay taxes related to unrestricted stock
Issuance of common stock under employee stock purchase plan
Repurchase of common stock
from December 31, 2015 to December 31, 2016
Issuance of unrestricted stock
Shares surrendered by employees to pay taxes related to unrestricted stock
Issuance of common stock under employee stock purchase plan
Repurchase of common stock
from December 31, 2014 to December 31, 2015
Issuance of unrestricted stock
Shares surrendered by employees to pay taxes related to unrestricted stock
Issuance of common stock under employee stock purchase plan
From December 31, 2013 to December 31, 2014
Exercise of common stock options
Issuance of unrestricted stock
Shares surrendered by employees to pay taxes related to unrestricted stock
Issuance of common stock under employee stock purchase plan
from December 31, 2012 to December 31, 2013
Issuance of common stock under employee stock purchase plan
Shares surrendered by employees to pay taxes related to unrestricted stock
Issuance of unrestricted stock
Exercise of common stock options
from December 31, 2011 to December 31, 2012
Exercise of common stock options
Issuance of unrestricted stock
Shares surrendered by employees to pay taxes related to unrestricted stock
Issuance of common stock under employee stock purchase plan
from December 31, 2011 to September 30, 2012
Exercise of common stock options
Issuance of unrestricted stock
Shares surrendered by employees to pay taxes related to unrestricted stock
Issuance of common stock under employee stock purchase plan
from December 31, 2011 to June 30, 2012
Exercise of common stock options
Issuance of unrestricted stock
Shares surrendered by employees to pay taxes related to unrestricted stock
Issuance of common stock under employee stock purchase plan
from December 31, 2010 to December 31, 2011
Exercise of common stock options
Issuance of unrestricted stock
Shares surrendered by employees to pay taxes related to unrestricted stock
Repurchase of common stock
Issuance of common stock under employee stock purchase plan
Exercise of common stock options
Issuance of unrestricted stock under a stock option exchange program
Shares surrendered by employees to pay taxes related to unrestricted stock
Issuance of unrestricted stock
Issuance of common stock under employee stock purchase plan
from December 31, 2008 to December 31, 2009
Issuance of unrestricted stock
Repurchase of common stock
Issuance of common stock under employee stock purchase plan
from December 31, 2007 to December 31, 2008
Exercise of common stock options
Repurchase of common stock
from December 31, 2006 to December 31, 2007
Exercise of common stock options
Repurchase of common stock
Issuance of unrestricted stock
Shares surrendered by employees to pay taxes related to unrestricted stock
from December 31, 2005 to December 31, 2006
Exercise of common stock options
Issuance of unrestricted stock
Issuance of common stock under employee stock purchase plan
from December 31, 2004 to December 31, 2005
Exercise of common stock options
Issuance of common stock under employee stock purchase plan
from December 31, 2003 to December 31, 2004
Exercise of common stock options
Issuance of common stock under employee stock purchase plan
from December 31, 2002 to December 31, 2003
Exercise of common stock options
Issuance of common stock under employee stock purchase plan
from December 31, 2001 to December 31, 2002
Exercise of common stock options
Issuance of common stock under employee stock purchase plan
from December 31, 2000 to December 31, 2001
Exercise of common stock options
Issuance of common stock under employee stock purchase plan
from December 31, 1999 to December 31, 2000
Exercise of common stock options
Issuance of common stock under employee stock purchase plan
from December 31, 1998 to December 31, 1999
Exercise of common stock options
Issuance of common stock under employee stock purchase plan
from December 31, 1997 to December 31, 1998
Exercise of common stock options,1,258,171 shares
Issuance of common stock under employee stock purchase plan , 7,193 shares
Retirement of treasury stock
from December 31, 1996 to December 31, 1997
Exercise of common stock options,686,127 shares
from December 31, 1995 to December 31, 1996
Conversion of preferred stock to common stock, 12,799,800 shares
Issuance of common stock in initial public offering, net of issuance costs, 3,910,000 shares
Exercise of common stock options,1,083,162 shares
from December 31, 1994 to December 31, 1995
Repurchase of Series D preferred stock, 4,100 shares
Exercise of common stock options, 16,867 shares