F. THOMSON LEIGHTON

Business address
145 Broadway, Cambridge, MA, 02142
Top holdings (ownership)
AKAM
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F. THOMSON LEIGHTON has filed 150 SEC EDGAR filings since 14 Feb 2000

Latest Filings

Form type Document Filing Description Filing date Reporting date File number(s)
4 Open Document Open Filing FORM 4 12 Aug 2025 11 Aug 2025 000-27275
4 Open Document Open Filing FORM 4 07 Mar 2025 07 Mar 2025 000-27275
4 Open Document Open Filing FORM 4 06 Mar 2025 06 Mar 2025 000-27275
4 Open Document Open Filing FORM 4 05 Mar 2025 03 Mar 2025 000-27275
4 Open Document Open Filing FORM 4 27 Feb 2025 27 Feb 2025 000-27275
4 Open Document Open Filing FORM 4 25 Feb 2025 21 Feb 2025 000-27275
4 Open Document Open Filing FORM 4 21 Feb 2025 19 Feb 2025 000-27275
4 Open Document Open Filing FORM 4 14 May 2024 14 May 2024 000-27275
4 Open Document Open Filing FORM 4 08 Mar 2024 07 Mar 2024 000-27275
4 Open Document Open Filing FORM 4 06 Mar 2024 04 Mar 2024 000-27275
4 Open Document Open Filing FORM 4 05 Mar 2024 01 Mar 2024 000-27275
4 Open Document Open Filing FORM 4 23 Feb 2024 21 Feb 2024 000-27275
4 Open Document Open Filing FORM 4 30 Aug 2023 28 Aug 2023 000-27275
4 Open Document Open Filing FORM 4 20 Jun 2023 20 Jun 2023 000-27275
4 Open Document Open Filing FORM 4 16 Jun 2023 14 Jun 2023 000-27275
4 Open Document Open Filing FORM 4 13 Jun 2023 12 Jun 2023 000-27275
4 Open Document Open Filing FORM 4 09 Jun 2023 07 Jun 2023 000-27275
4 Open Document Open Filing FORM 4 06 Jun 2023 05 Jun 2023 000-27275
4 Open Document Open Filing FORM 4 02 Jun 2023 01 Jun 2023 000-27275
4 Open Document Open Filing FORM 4 31 May 2023 30 May 2023 000-27275
4 Open Document Open Filing FORM 4 26 May 2023 24 May 2023 000-27275
4 Open Document Open Filing FORM 4 23 May 2023 22 May 2023 000-27275
4 Open Document Open Filing FORM 4 19 May 2023 17 May 2023 000-27275
4 Open Document Open Filing FORM 4 16 May 2023 15 May 2023 000-27275
4 Open Document Open Filing FORM 4 05 May 2023 04 May 2023 000-27275
4 Open Document Open Filing FORM 4 03 May 2023 01 May 2023 000-27275
4 Open Document Open Filing FORM 4 28 Apr 2023 27 Apr 2023 000-27275
4 Open Document Open Filing FORM 4 26 Apr 2023 24 Apr 2023 000-27275
4 Open Document Open Filing FORM 4 21 Apr 2023 19 Apr 2023 000-27275
4 Open Document Open Filing FORM 4 18 Apr 2023 17 Apr 2023 000-27275
4 Open Document Open Filing FORM 4 14 Apr 2023 13 Apr 2023 000-27275
4 Open Document Open Filing FORM 4 12 Apr 2023 11 Apr 2023 000-27275
4 Open Document Open Filing FORM 4 10 Apr 2023 06 Apr 2023 000-27275
4 Open Document Open Filing FORM 4 05 Apr 2023 03 Apr 2023 000-27275
4/A Open Document Open Filing FORM 4/A 31 Mar 2023 06 Mar 2023 000-27275
4 Open Document Open Filing FORM 4 31 Mar 2023 29 Mar 2023 000-27275
4 Open Document Open Filing FORM 4 28 Mar 2023 27 Mar 2023 000-27275
4 Open Document Open Filing FORM 4 24 Mar 2023 23 Mar 2023 000-27275
4 Open Document Open Filing FORM 4 22 Mar 2023 20 Mar 2023 000-27275
4 Open Document Open Filing FORM 4 17 Mar 2023 15 Mar 2023 000-27275
4 Open Document Open Filing FORM 4 14 Mar 2023 13 Mar 2023 000-27275
4 Open Document Open Filing FORM 4 10 Mar 2023 09 Mar 2023 000-27275
4 Open Document Open Filing FORM 4 08 Mar 2023 06 Mar 2023 000-27275
4 Open Document Open Filing FORM 4 06 Mar 2023 06 Mar 2023 000-27275
4 Open Document Open Filing FORM 4 03 Mar 2023 01 Mar 2023 000-27275
4 Open Document Open Filing FORM 4 28 Feb 2023 27 Feb 2023 000-27275
4 Open Document Open Filing FORM 4 24 Feb 2023 24 Feb 2023 000-27275
4 Open Document Open Filing FORM 4 23 Feb 2023 21 Feb 2023 000-27275
4 Open Document Open Filing FORM 4 21 Feb 2023 21 Feb 2023 000-27275
4 Open Document Open Filing FORM 4 10 Feb 2023 08 Feb 2023 000-27275
4 Open Document Open Filing FORM 4 07 Feb 2023 06 Feb 2023 000-27275
4 Open Document Open Filing FORM 4 03 Feb 2023 01 Feb 2023 000-27275
4 Open Document Open Filing FORM 4 31 Jan 2023 30 Jan 2023 000-27275
4 Open Document Open Filing FORM 4 27 Jan 2023 25 Jan 2023 000-27275
4 Open Document Open Filing FORM 4 24 Jan 2023 23 Jan 2023 000-27275
4 Open Document Open Filing FORM 4 20 Jan 2023 18 Jan 2023 000-27275
4 Open Document Open Filing FORM 4 17 Jan 2023 17 Jan 2023 000-27275
4 Open Document Open Filing FORM 4 13 Jan 2023 11 Jan 2023 000-27275
4 Open Document Open Filing FORM 4 10 Jan 2023 09 Jan 2023 000-27275
4 Open Document Open Filing FORM 4 06 Jan 2023 04 Jan 2023 000-27275
4 Open Document Open Filing FORM 4 03 Jan 2023 03 Jan 2023 000-27275
4 Open Document Open Filing FORM 4 30 Dec 2022 28 Dec 2022 000-27275
4 Open Document Open Filing FORM 4 27 Dec 2022 27 Dec 2022 000-27275
4 Open Document Open Filing FORM 4 23 Dec 2022 21 Dec 2022 000-27275
4 Open Document Open Filing FORM 4 20 Dec 2022 19 Dec 2022 000-27275
4 Open Document Open Filing FORM 4 16 Dec 2022 15 Dec 2022 000-27275
4 Open Document Open Filing FORM 4 14 Dec 2022 01 Aug 2022 000-27275
4 Open Document Open Filing FORM 4 09 Mar 2022 07 Mar 2022 000-27275
4 Open Document Open Filing FORM 4 04 Mar 2022 03 Mar 2022 000-27275
4 Open Document Open Filing FORM 4 03 Mar 2022 01 Mar 2022 000-27275
4 Open Document Open Filing FORM 4 24 Feb 2022 22 Feb 2022 000-27275
4 Open Document Open Filing FORM 4 23 Feb 2022 21 Feb 2022 000-27275
4 Open Document Open Filing FORM 4 03 Mar 2021 01 Mar 2021 000-27275
4 Open Document Open Filing FORM 4 22 Feb 2021 18 Feb 2021 000-27275
4 Open Document Open Filing FORM 4 10 Feb 2021 08 Feb 2021 000-27275
5 Open Document Open Filing FORM 5 15 Jan 2021 31 Dec 2020 000-27275
4 Open Document Open Filing FORM 4 26 May 2020 03 Mar 2020 000-27275
4 Open Document Open Filing FORM 4 05 Mar 2020 03 Mar 2020 000-27275
4 Open Document Open Filing FORM 4 03 Mar 2020 01 Mar 2020 000-27275
4 Open Document Open Filing FORM 4 11 Feb 2020 08 Feb 2020 000-27275
5 Open Document Open Filing FORM 5 24 Jan 2020 31 Dec 2019 000-27275
4 Open Document Open Filing FORM 4 06 Mar 2019 01 Mar 2019 000-27275
4 Open Document Open Filing FORM 4 25 Feb 2019 21 Feb 2019 000-27275
4 Open Document Open Filing FORM 4 11 Feb 2019 08 Feb 2019 000-27275
5 Open Document Open Filing FORM 5 04 Jan 2019 31 Dec 2018 000-27275
4 Open Document Open Filing FORM 4 27 Feb 2018 23 Feb 2018 000-27275
4 Open Document Open Filing FORM 4 26 Feb 2018 22 Feb 2018 000-27275
4 Open Document Open Filing FORM 4 12 Feb 2018 08 Feb 2018 000-27275
4 Open Document Open Filing FORM 4 28 Dec 2017 28 Dec 2017 000-27275
4 Open Document Open Filing FORM 4 15 Dec 2017 15 Dec 2017 000-27275
4 Open Document Open Filing FORM 4 16 Nov 2017 15 Nov 2017 000-27275
4 Open Document Open Filing FORM 4 18 Oct 2017 16 Oct 2017 000-27275
4/A Open Document Open Filing FORM 4/A 29 Sep 2017 15 Sep 2017 000-27275
4 Open Document Open Filing FORM 4 18 Sep 2017 15 Sep 2017 000-27275
4 Open Document Open Filing FORM 4 16 Aug 2017 15 Aug 2017 000-27275
4 Open Document Open Filing FORM 4 17 Jul 2017 14 Jul 2017 000-27275
4 Open Document Open Filing FORM 4 16 Jun 2017 15 Jun 2017 000-27275
4 Open Document Open Filing FORM 4 01 Jun 2017 31 May 2017 000-27275
4 Open Document Open Filing FORM 4 07 Mar 2017 03 Mar 2017 000-27275
4 Open Document Open Filing FORM 4 27 Feb 2017 23 Feb 2017 000-27275
4 Open Document Open Filing FORM 4 14 Feb 2017 11 Feb 2017 000-27275
4 Open Document Open Filing FORM 4 10 Feb 2017 09 Feb 2017 000-27275
4 Open Document Open Filing FORM 4 09 Feb 2017 07 Feb 2017 000-27275
5 Open Document Open Filing FORM 5 06 Jan 2017 31 Dec 2016 000-27275
4 Open Document Open Filing FORM 4 16 Dec 2016 15 Dec 2016 000-27275
4 Open Document Open Filing FORM 4 16 Nov 2016 15 Nov 2016 000-27275
4 Open Document Open Filing FORM 4 18 Oct 2016 17 Oct 2016 000-27275
4 Open Document Open Filing FORM 4 19 Sep 2016 15 Sep 2016 000-27275
4 Open Document Open Filing FORM 4 16 Aug 2016 15 Aug 2016 000-27275
4 Open Document Open Filing FORM 4 18 Jul 2016 15 Jul 2016 000-27275
4 Open Document Open Filing FORM 4 17 Jun 2016 16 Jun 2016 000-27275
4 Open Document Open Filing FORM 4 17 May 2016 16 May 2016 000-27275
4 Open Document Open Filing FORM 4 18 Apr 2016 15 Apr 2016 000-27275
4 Open Document Open Filing FORM 4 17 Mar 2016 16 Mar 2016 000-27275
4 Open Document Open Filing FORM 4 07 Mar 2016 03 Mar 2016 000-27275
4 Open Document Open Filing FORM 4 17 Feb 2016 16 Feb 2016 000-27275
4 Open Document Open Filing FORM 4 16 Feb 2016 11 Feb 2016 000-27275
4 Open Document Open Filing FORM 4 10 Feb 2016 08 Feb 2016 000-27275
4 Open Document Open Filing FORM 4 04 Jan 2016 30 Dec 2015 000-27275
4 Open Document Open Filing FORM 4 16 Sep 2015 15 Sep 2015 000-27275
4 Open Document Open Filing FORM 4 17 Feb 2015 12 Feb 2015 000-27275
4 Open Document Open Filing FORM 4 11 Feb 2015 09 Feb 2015 000-27275
5 Open Document Open Filing FORM 5 10 Feb 2015 31 Dec 2014 000-27275
4 Open Document Open Filing FORM 4 06 Nov 2014 05 Nov 2014 000-27275
4 Open Document Open Filing FORM 4 05 Aug 2014 01 Aug 2014 000-27275
4 Open Document Open Filing FORM 4 10 Feb 2014 07 Feb 2014 000-27275