股本结构
单位：万股
| 公告日期 | 2025-12-19 | 2025-11-13 | 2025-04-04 | 2025-03-13 | 2025-03-13 | 2024-08-13 |
|---|---|---|---|---|---|---|
| 证券总股本 | 809.01 | 808.69 | 808.12 | 808.13 | 807.37 | 807.10 |
| 普通股本 | 809.01 | 808.69 | 808.12 | 808.13 | 807.37 | 807.10 |
| 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 | 2025-12-12 | 2025-09-30 | 2025-03-14 | 2025-03-13 | 2024-12-31 | 2024-08-13 |
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 |
|---|---|---|---|---|
| 2025-12-19 | 809.01 | 未披露 | 定期报告 | 2025-12-12 |
| 2025-11-13 | 808.69 | 未披露 |
更多>>
From June 30, 2025 to September 30, 2025
Shares issued for stock grants
|
2025-09-30 |
| 2025-04-04 | 808.12 | 未披露 | 定期报告 | 2025-03-14 |
| 2025-03-13 | 808.13 | 未披露 | 定期报告 | 2025-03-13 |
| 2025-03-13 | 807.37 | 未披露 |
更多>>
From December 31, 2023 to December 31, 2024
Stock-based compensation, net
Common shares repurchased (43,858 shares)
|
2024-12-31 |
| 2024-08-13 | 807.10 | 未披露 | 定期报告 | 2024-08-13 |
| 2024-05-14 | 806.71 | 未披露 |
更多>>
From December 31, 2023 to March 31, 2024
Stock-based compensation, net
Common shares repurchased (43,858)
|
2024-03-31 |
| 2024-03-28 | 806.91 | 未披露 | 定期报告 | 2024-03-28 |
| 2024-04-05 | 806.71 | 未披露 | 定期报告 | 2024-03-15 |
| 2024-03-28 | 809.53 | 未披露 |
更多>>
From December 31, 2022 to December 31, 2023
Stock-based compensation, net
Treasury shares acquired (164,221 shares)
|
2023-12-31 |
| 2023-11-13 | 809.26 | 未披露 |
更多>>
From June 30, 2023 to August 14, 2023
Stock-based compensation, net
|
2023-08-14 |
| 2023-03-15 | 808.88 | 未披露 | 定期报告 | 2023-03-14 |
| 2023-03-15 | 824.52 | 未披露 |
更多>>
From December 31, 2021 to December 31, 2022
Common stock issued in business combination
Stock-based compensation, net
Treasury shares acquired (229,420 shares)
|
2022-12-31 |
| 2022-09-27 | 576.78 | 未披露 | 定期报告 | 2022-09-22 |
| 2022-08-08 | 580.16 | 未披露 | 定期报告 | 2022-08-05 |
| 2022-08-08 | 581.04 | 未披露 |
更多>>
From March 31, 2022 to June 30, 2022
Treasury shares acquired (63,214)
|
2022-06-30 |
| 2022-05-10 | 585.63 | 未披露 | 定期报告 | 2022-05-10 |
| 2022-05-10 | 587.36 | 未披露 |
更多>>
From December 31, 2021 to March 31, 2022
Stock-based compensation, net
|
2022-03-31 |
| 2022-04-05 | 587.81 | 未披露 | 定期报告 | 2022-03-17 |
| 2022-03-15 | 588.00 | 未披露 | 定期报告 | 2022-03-15 |
| 2022-02-15 | 587.42 | 未披露 | 定期报告 | 2022-02-14 |
| 2022-01-25 | 588.87 | 未披露 | 定期报告 | 2021-12-31 |
| 2021-11-10 | 596.81 | 未披露 | 定期报告 | 2021-11-10 |
| 2021-11-10 | 605.41 | 未披露 |
更多>>
From June 30, 2021 to September 30, 2021
Stock-based compensation, net
Treasury shares acquired (165,058)
|
2021-09-30 |
| 2021-08-13 | 612.89 | 未披露 | 定期报告 | 2021-08-09 |
| 2021-08-05 | 614.64 | 未披露 | 定期报告 | 2021-08-05 |
| 2021-08-05 | 621.55 | 未披露 |
更多>>
From March 31, 2021 to June 30, 2021
Stock-based compensation, net
|
2021-06-30 |
| 2021-05-05 | 633.35 | 未披露 | 定期报告 | 2021-05-05 |
| 2021-04-05 | 634.47 | 未披露 | 定期报告 | 2021-03-18 |
| 2021-03-12 | 642.77 | 未披露 | 定期报告 | 2021-03-12 |
| 2020-11-03 | 637.90 | 未披露 | 定期报告 | 2020-11-03 |
| 2020-11-03 | 637.81 | 未披露 |
更多>>
From June 30, 2020 to August 4, 2020
Stock options exercised
Stock-based compensation,net
|
2020-08-04 |
| 2020-05-06 | 636.95 | 未披露 |
更多>>
From December 31, 2019 to March 31, 2020
Stock-based compensation, net
Treasury shares acquired (58,200 shares)
|
2020-03-31 |
| 2020-04-03 | 637.77 | 未披露 | 定期报告 | 2020-03-19 |
| 2020-03-04 | 642.77 | 未披露 | 定期报告 | 2020-03-04 |
| 2020-03-04 | 642.36 | 未披露 |
更多>>
From December 31, 2018 to December 31, 2019
Stock options exercised
Dividend reinvestment and purchase plan
Stock-based compensation, net
Treasury shares acquired (98,832 shares)
|
2019-12-31 |
| 2019-10-18 | 640.00 | 未披露 |
更多>>
Middlefield’s Board recently declared a two-for-one stock split that will be effective on November 8, 2019 and will increase the number of shares outstanding to approximately 6.4 million shares.
|
2019-11-12 |
| 2019-11-05 | 321.17 | 未披露 | 定期报告 | 2019-11-05 |
| 2019-11-05 | 321.16 | 未披露 |
更多>>
from June 30, 2019 to September 30, 2019
Dividend reinvestment and purchase plan
|
2019-09-30 |
| 2019-08-06 | 324.28 | 未披露 | 定期报告 | 2019-08-06 |
| 2019-08-06 | 324.26 | 未披露 |
更多>>
from March 31, 2019 to June 30,2019
Dividend reinvestment and purchase plan
Stock options exercised
Treasury shares acquired (17,747)
|
2019-06-30 |
| 2019-05-07 | 325.67 | 未披露 | 定期报告 | 2019-05-07 |
| 2019-05-07 | 325.64 | 未披露 |
更多>>
From December 31, 2018 to March 21, 2019
Dividend reinvestment and purchase plan
Stock-based compensation, net
|
2019-03-21 |
| 2019-03-06 | 363.28 | 未披露 | 定期报告 | 2019-03-06 |
| 2019-03-06 | 324.43 | 未披露 |
更多>>
From December 31, 2017 to December 31, 2018
Dividend reinvestment and purchase plan
Stock options exercised
Stock-based compensation
|
2018-12-31 |
| 2018-11-06 | 323.83 | 未披露 | 定期报告 | 2018-11-06 |
| 2018-11-06 | 323.67 | 未披露 |
更多>>
from December 31, 2017 to September 30, 2018
Dividend reinvestment and purchase plan (8,763 shares)
Stock options exercised (4,650 shares)
Stock-based compensation (5,560 shares)
|
2018-09-30 |
| 2018-08-07 | 323.39 | 未披露 | 定期报告 | 2018-08-07 |
| 2018-08-07 | 323.37 | 未披露 |
更多>>
from December 31, 2017 to June 30, 2018
Dividend reinvestment and purchase plan (5,902 shares)
Stock options exercised (4,500 shares)
Stock-based compensation expense (5,560 shares)
|
2018-06-30 |
| 2018-05-09 | 322.45 | 未披露 | 定期报告 | 2018-05-09 |
| 2018-05-09 | 322.30 | 未披露 |
更多>>
From December 31, 2017 to March 21, 2018
Dividend reinvestment and purchase plan (3,278 shares)
Stock-based compensation expense (1,990 shares)
|
2018-03-21 |
| 2018-03-07 | 360.59 | 未披露 | 定期报告 | 2018-03-07 |
| 2018-03-07 | 321.77 | 未披露 |
更多>>
from December 31, 2016 to December 31, 2017
Common stock issued in business combination
Other common stock issuance, net of offering cost ($760)
Dividend reinvestment and purchase plan
Stock options exercised
Stock-based compensation expense
|
2017-12-31 |
| 2017-11-14 | 321.48 | 未披露 | 定期报告 | 2017-11-14 |
| 2017-11-14 | 321.47 | 未披露 |
更多>>
from December 31, 2016 to September 30, 2017
Common stock issued in business combination (544,610 shares)
Other common stock issuances, net of offering cost (399,008 shares)
Dividend reinvestment and purchase plan (8,917 shares)
Stock options exercised (7,126 shares)
Stock issued in connection with equity awards, net (823 shares)
|
2017-09-30 |
| 2017-08-14 | 321.18 | 未披露 | 定期报告 | 2017-08-14 |
| 2017-08-14 | 321.17 | 未披露 |
更多>>
from December 31, 2016 to June 30, 2017
Common stock issued in business combination (554,610 shares)
Common stock issuance (396,957 shares)
Dividend reinvestment and purchase plan (5,928 shares)
|
2017-06-30 |
| 2017-05-15 | 320.49 | 未披露 | 定期报告 | 2017-05-15 |
| 2017-05-15 | 280.36 | 未披露 |
更多>>
from December 31, 2016 to March 21, 2017
Common stock issuance (546,107 shares)
Dividend reinvestment and purchase plan (3,197 shares)
|
2017-03-21 |
| 2017-03-15 | 280.04 | 未披露 | 定期报告 | 2017-03-10 |
| 2017-03-06 | 225.43 | 未披露 | 定期报告 | 2016-12-31 |
| 2016-11-22 | 225.09 | 未披露 | 定期报告 | 2016-11-17 |
| 2016-11-14 | 225.07 | 未披露 | 定期报告 | 2016-11-10 |
| 2016-11-14 | 225.07 | 未披露 |
更多>>
from December 31, 2015 to September 30, 2016
Common stock issuance, net of cost (360,815 shares)
Dividend reinvestment and purchase plan (11,712 shares)
|
2016-09-30 |
| 2016-09-13 | 224.69 | 未披露 | 定期报告 | 2016-09-13 |
| 2016-08-10 | 224.70 | 未披露 | 定期报告 | 2016-08-10 |
| 2016-08-10 | 224.69 | 未披露 |
更多>>
from December 31, 2015 to June 30, 2016
Common stock issuance, net of cost (361,715 shares)
Dividend reinvestment and purchase plan (7,951 shares)
|
2016-06-30 |
| 2016-05-11 | 203.37 | 未披露 | 定期报告 | 2016-05-11 |
| 2016-05-11 | 188.20 | 未披露 |
更多>>
from December 31, 2015 to March 21, 2016
Common stock issuance (900 shares)
Dividend reinvestment and purchase plan (3,888 shares)
|
2016-03-21 |
| 2016-03-09 | 187.74 | 未披露 | 定期报告 | 2016-03-09 |
| 2016-03-09 | 187.72 | 未披露 |
更多>>
From December 31, 2014 to December 31, 2015
Dividend reinvestment and purchase plan
Stock options exercised
Stock-based compensation
Purchase of treasury stock (196,635 shares)
|
2015-12-31 |
| 2015-11-10 | 187.31 | 未披露 | 定期报告 | 2015-11-10 |
| 2015-11-10 | 206.95 | 未披露 |
更多>>
from December 31, 2014 to September 30, 2015
Dividend reinvestment and purchase plan (16,029 shares)
Stock options exercised (400 shares)
|
2015-09-30 |
| 2015-08-11 | 206.27 | 未披露 | 定期报告 | 2015-08-11 |
| 2015-08-11 | 206.26 | 未披露 |
更多>>
from December 31, 2014 to June 30, 2015
Dividend reinvestment and purchase plan (9,754 shares)
Stock options exercised (400 shares)
|
2015-06-30 |
| 2015-05-13 | 224.78 | 未披露 | 定期报告 | 2015-05-13 |
| 2015-05-13 | 205.80 | 未披露 |
更多>>
from December 31, 2014 to March 23, 2015
Dividend reinvestment and purchase plan (5,281 shares)
Stock options exercised (250 shares)
|
2015-03-23 |
| 2015-03-11 | 205.26 | 未披露 | 定期报告 | 2015-03-11 |
| 2015-03-11 | 205.25 | 未披露 |
更多>>
From December 31, 2013 to December 31, 2014
Dividend reinvestment and purchase plan
Stock-based compensation
|
2014-12-31 |
| 2014-11-04 | 204.89 | 未披露 | 定期报告 | 2014-11-04 |
| 2014-11-04 | 204.88 | 未披露 |
更多>>
From December 31, 2013 to September 30, 2014
Dividend reinvestment and purchase plan (16,103 shares)
Stock options exercised
Employee stock awards (400 shares)
|
2014-09-30 |
| 2014-08-12 | 204.29 | 未披露 | 定期报告 | 2014-08-12 |
| 2014-08-12 | 204.28 | 未披露 |
更多>>
From December 31, 2013 to June 30, 2014
Dividend reinvestment and purchase plan (10,049 shares)
Employee Stock Grants (400 shares)
|
2014-06-30 |
From June 30, 2025 to September 30, 2025
Shares issued for stock grants
From December 31, 2023 to December 31, 2024
Stock-based compensation, net
Common shares repurchased (43,858 shares)
From December 31, 2023 to March 31, 2024
Stock-based compensation, net
Common shares repurchased (43,858)
From December 31, 2022 to December 31, 2023
Stock-based compensation, net
Treasury shares acquired (164,221 shares)
From June 30, 2023 to August 14, 2023
Stock-based compensation, net
From December 31, 2021 to December 31, 2022
Common stock issued in business combination
Stock-based compensation, net
Treasury shares acquired (229,420 shares)
From March 31, 2022 to June 30, 2022
Treasury shares acquired (63,214)
From December 31, 2021 to March 31, 2022
Stock-based compensation, net
From June 30, 2021 to September 30, 2021
Stock-based compensation, net
Treasury shares acquired (165,058)
From March 31, 2021 to June 30, 2021
Stock-based compensation, net
From June 30, 2020 to August 4, 2020
Stock options exercised
Stock-based compensation,net
From December 31, 2019 to March 31, 2020
Stock-based compensation, net
Treasury shares acquired (58,200 shares)
From December 31, 2018 to December 31, 2019
Stock options exercised
Dividend reinvestment and purchase plan
Stock-based compensation, net
Treasury shares acquired (98,832 shares)
Middlefield’s Board recently declared a two-for-one stock split that will be effective on November 8, 2019 and will increase the number of shares outstanding to approximately 6.4 million shares.
from June 30, 2019 to September 30, 2019
Dividend reinvestment and purchase plan
from March 31, 2019 to June 30,2019
Dividend reinvestment and purchase plan
Stock options exercised
Treasury shares acquired (17,747)
From December 31, 2018 to March 21, 2019
Dividend reinvestment and purchase plan
Stock-based compensation, net
From December 31, 2017 to December 31, 2018
Dividend reinvestment and purchase plan
Stock options exercised
Stock-based compensation
from December 31, 2017 to September 30, 2018
Dividend reinvestment and purchase plan (8,763 shares)
Stock options exercised (4,650 shares)
Stock-based compensation (5,560 shares)
from December 31, 2017 to June 30, 2018
Dividend reinvestment and purchase plan (5,902 shares)
Stock options exercised (4,500 shares)
Stock-based compensation expense (5,560 shares)
From December 31, 2017 to March 21, 2018
Dividend reinvestment and purchase plan (3,278 shares)
Stock-based compensation expense (1,990 shares)
from December 31, 2016 to December 31, 2017
Common stock issued in business combination
Other common stock issuance, net of offering cost ($760)
Dividend reinvestment and purchase plan
Stock options exercised
Stock-based compensation expense
from December 31, 2016 to September 30, 2017
Common stock issued in business combination (544,610 shares)
Other common stock issuances, net of offering cost (399,008 shares)
Dividend reinvestment and purchase plan (8,917 shares)
Stock options exercised (7,126 shares)
Stock issued in connection with equity awards, net (823 shares)
from December 31, 2016 to June 30, 2017
Common stock issued in business combination (554,610 shares)
Common stock issuance (396,957 shares)
Dividend reinvestment and purchase plan (5,928 shares)
from December 31, 2016 to March 21, 2017
Common stock issuance (546,107 shares)
Dividend reinvestment and purchase plan (3,197 shares)
from December 31, 2015 to September 30, 2016
Common stock issuance, net of cost (360,815 shares)
Dividend reinvestment and purchase plan (11,712 shares)
from December 31, 2015 to June 30, 2016
Common stock issuance, net of cost (361,715 shares)
Dividend reinvestment and purchase plan (7,951 shares)
from December 31, 2015 to March 21, 2016
Common stock issuance (900 shares)
Dividend reinvestment and purchase plan (3,888 shares)
From December 31, 2014 to December 31, 2015
Dividend reinvestment and purchase plan
Stock options exercised
Stock-based compensation
Purchase of treasury stock (196,635 shares)
from December 31, 2014 to September 30, 2015
Dividend reinvestment and purchase plan (16,029 shares)
Stock options exercised (400 shares)
from December 31, 2014 to June 30, 2015
Dividend reinvestment and purchase plan (9,754 shares)
Stock options exercised (400 shares)
from December 31, 2014 to March 23, 2015
Dividend reinvestment and purchase plan (5,281 shares)
Stock options exercised (250 shares)
From December 31, 2013 to December 31, 2014
Dividend reinvestment and purchase plan
Stock-based compensation
From December 31, 2013 to September 30, 2014
Dividend reinvestment and purchase plan (16,103 shares)
Stock options exercised
Employee stock awards (400 shares)
From December 31, 2013 to June 30, 2014
Dividend reinvestment and purchase plan (10,049 shares)
Employee Stock Grants (400 shares)