F. THOMSON LEIGHTON SEC EDGAR Filings (CIK 0001106232)

SEC EDGAR filings, ownership reports, and insider transactions for 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

Recent SEC filings for F. THOMSON LEIGHTON including 4, 4/A, 5 and more.

Form type Document Filing Description Filing date Reporting date File number(s)
4 Open 4 document View SEC filing for 4 FORM 4 12 Aug 2025 11 Aug 2025 000-27275
4 Open 4 document View SEC filing for 4 FORM 4 07 Mar 2025 07 Mar 2025 000-27275
4 Open 4 document View SEC filing for 4 FORM 4 06 Mar 2025 06 Mar 2025 000-27275
4 Open 4 document View SEC filing for 4 FORM 4 05 Mar 2025 03 Mar 2025 000-27275
4 Open 4 document View SEC filing for 4 FORM 4 27 Feb 2025 27 Feb 2025 000-27275
4 Open 4 document View SEC filing for 4 FORM 4 25 Feb 2025 21 Feb 2025 000-27275
4 Open 4 document View SEC filing for 4 FORM 4 21 Feb 2025 19 Feb 2025 000-27275
4 Open 4 document View SEC filing for 4 FORM 4 14 May 2024 14 May 2024 000-27275
4 Open 4 document View SEC filing for 4 FORM 4 08 Mar 2024 07 Mar 2024 000-27275
4 Open 4 document View SEC filing for 4 FORM 4 06 Mar 2024 04 Mar 2024 000-27275
4 Open 4 document View SEC filing for 4 FORM 4 05 Mar 2024 01 Mar 2024 000-27275
4 Open 4 document View SEC filing for 4 FORM 4 23 Feb 2024 21 Feb 2024 000-27275
4 Open 4 document View SEC filing for 4 FORM 4 30 Aug 2023 28 Aug 2023 000-27275
4 Open 4 document View SEC filing for 4 FORM 4 20 Jun 2023 20 Jun 2023 000-27275
4 Open 4 document View SEC filing for 4 FORM 4 16 Jun 2023 14 Jun 2023 000-27275
4 Open 4 document View SEC filing for 4 FORM 4 13 Jun 2023 12 Jun 2023 000-27275
4 Open 4 document View SEC filing for 4 FORM 4 09 Jun 2023 07 Jun 2023 000-27275
4 Open 4 document View SEC filing for 4 FORM 4 06 Jun 2023 05 Jun 2023 000-27275
4 Open 4 document View SEC filing for 4 FORM 4 02 Jun 2023 01 Jun 2023 000-27275
4 Open 4 document View SEC filing for 4 FORM 4 31 May 2023 30 May 2023 000-27275
4 Open 4 document View SEC filing for 4 FORM 4 26 May 2023 24 May 2023 000-27275
4 Open 4 document View SEC filing for 4 FORM 4 23 May 2023 22 May 2023 000-27275
4 Open 4 document View SEC filing for 4 FORM 4 19 May 2023 17 May 2023 000-27275
4 Open 4 document View SEC filing for 4 FORM 4 16 May 2023 15 May 2023 000-27275
4 Open 4 document View SEC filing for 4 FORM 4 05 May 2023 04 May 2023 000-27275
4 Open 4 document View SEC filing for 4 FORM 4 03 May 2023 01 May 2023 000-27275
4 Open 4 document View SEC filing for 4 FORM 4 28 Apr 2023 27 Apr 2023 000-27275
4 Open 4 document View SEC filing for 4 FORM 4 26 Apr 2023 24 Apr 2023 000-27275
4 Open 4 document View SEC filing for 4 FORM 4 21 Apr 2023 19 Apr 2023 000-27275
4 Open 4 document View SEC filing for 4 FORM 4 18 Apr 2023 17 Apr 2023 000-27275
4 Open 4 document View SEC filing for 4 FORM 4 14 Apr 2023 13 Apr 2023 000-27275
4 Open 4 document View SEC filing for 4 FORM 4 12 Apr 2023 11 Apr 2023 000-27275
4 Open 4 document View SEC filing for 4 FORM 4 10 Apr 2023 06 Apr 2023 000-27275
4 Open 4 document View SEC filing for 4 FORM 4 05 Apr 2023 03 Apr 2023 000-27275
4/A Open 4/A document View SEC filing for 4/A FORM 4/A 31 Mar 2023 06 Mar 2023 000-27275
4 Open 4 document View SEC filing for 4 FORM 4 31 Mar 2023 29 Mar 2023 000-27275
4 Open 4 document View SEC filing for 4 FORM 4 28 Mar 2023 27 Mar 2023 000-27275
4 Open 4 document View SEC filing for 4 FORM 4 24 Mar 2023 23 Mar 2023 000-27275
4 Open 4 document View SEC filing for 4 FORM 4 22 Mar 2023 20 Mar 2023 000-27275
4 Open 4 document View SEC filing for 4 FORM 4 17 Mar 2023 15 Mar 2023 000-27275
4 Open 4 document View SEC filing for 4 FORM 4 14 Mar 2023 13 Mar 2023 000-27275
4 Open 4 document View SEC filing for 4 FORM 4 10 Mar 2023 09 Mar 2023 000-27275
4 Open 4 document View SEC filing for 4 FORM 4 08 Mar 2023 06 Mar 2023 000-27275
4 Open 4 document View SEC filing for 4 FORM 4 06 Mar 2023 06 Mar 2023 000-27275
4 Open 4 document View SEC filing for 4 FORM 4 03 Mar 2023 01 Mar 2023 000-27275
4 Open 4 document View SEC filing for 4 FORM 4 28 Feb 2023 27 Feb 2023 000-27275
4 Open 4 document View SEC filing for 4 FORM 4 24 Feb 2023 24 Feb 2023 000-27275
4 Open 4 document View SEC filing for 4 FORM 4 23 Feb 2023 21 Feb 2023 000-27275
4 Open 4 document View SEC filing for 4 FORM 4 21 Feb 2023 21 Feb 2023 000-27275
4 Open 4 document View SEC filing for 4 FORM 4 10 Feb 2023 08 Feb 2023 000-27275
4 Open 4 document View SEC filing for 4 FORM 4 07 Feb 2023 06 Feb 2023 000-27275
4 Open 4 document View SEC filing for 4 FORM 4 03 Feb 2023 01 Feb 2023 000-27275
4 Open 4 document View SEC filing for 4 FORM 4 31 Jan 2023 30 Jan 2023 000-27275
4 Open 4 document View SEC filing for 4 FORM 4 27 Jan 2023 25 Jan 2023 000-27275
4 Open 4 document View SEC filing for 4 FORM 4 24 Jan 2023 23 Jan 2023 000-27275
4 Open 4 document View SEC filing for 4 FORM 4 20 Jan 2023 18 Jan 2023 000-27275
4 Open 4 document View SEC filing for 4 FORM 4 17 Jan 2023 17 Jan 2023 000-27275
4 Open 4 document View SEC filing for 4 FORM 4 13 Jan 2023 11 Jan 2023 000-27275
4 Open 4 document View SEC filing for 4 FORM 4 10 Jan 2023 09 Jan 2023 000-27275
4 Open 4 document View SEC filing for 4 FORM 4 06 Jan 2023 04 Jan 2023 000-27275
4 Open 4 document View SEC filing for 4 FORM 4 03 Jan 2023 03 Jan 2023 000-27275
4 Open 4 document View SEC filing for 4 FORM 4 30 Dec 2022 28 Dec 2022 000-27275
4 Open 4 document View SEC filing for 4 FORM 4 27 Dec 2022 27 Dec 2022 000-27275
4 Open 4 document View SEC filing for 4 FORM 4 23 Dec 2022 21 Dec 2022 000-27275
4 Open 4 document View SEC filing for 4 FORM 4 20 Dec 2022 19 Dec 2022 000-27275
4 Open 4 document View SEC filing for 4 FORM 4 16 Dec 2022 15 Dec 2022 000-27275
4 Open 4 document View SEC filing for 4 FORM 4 14 Dec 2022 01 Aug 2022 000-27275
4 Open 4 document View SEC filing for 4 FORM 4 09 Mar 2022 07 Mar 2022 000-27275
4 Open 4 document View SEC filing for 4 FORM 4 04 Mar 2022 03 Mar 2022 000-27275
4 Open 4 document View SEC filing for 4 FORM 4 03 Mar 2022 01 Mar 2022 000-27275
4 Open 4 document View SEC filing for 4 FORM 4 24 Feb 2022 22 Feb 2022 000-27275
4 Open 4 document View SEC filing for 4 FORM 4 23 Feb 2022 21 Feb 2022 000-27275
4 Open 4 document View SEC filing for 4 FORM 4 03 Mar 2021 01 Mar 2021 000-27275
4 Open 4 document View SEC filing for 4 FORM 4 22 Feb 2021 18 Feb 2021 000-27275
4 Open 4 document View SEC filing for 4 FORM 4 10 Feb 2021 08 Feb 2021 000-27275
5 Open 5 document View SEC filing for 5 FORM 5 15 Jan 2021 31 Dec 2020 000-27275
4 Open 4 document View SEC filing for 4 FORM 4 26 May 2020 03 Mar 2020 000-27275
4 Open 4 document View SEC filing for 4 FORM 4 05 Mar 2020 03 Mar 2020 000-27275
4 Open 4 document View SEC filing for 4 FORM 4 03 Mar 2020 01 Mar 2020 000-27275
4 Open 4 document View SEC filing for 4 FORM 4 11 Feb 2020 08 Feb 2020 000-27275
5 Open 5 document View SEC filing for 5 FORM 5 24 Jan 2020 31 Dec 2019 000-27275
4 Open 4 document View SEC filing for 4 FORM 4 06 Mar 2019 01 Mar 2019 000-27275
4 Open 4 document View SEC filing for 4 FORM 4 25 Feb 2019 21 Feb 2019 000-27275
4 Open 4 document View SEC filing for 4 FORM 4 11 Feb 2019 08 Feb 2019 000-27275
5 Open 5 document View SEC filing for 5 FORM 5 04 Jan 2019 31 Dec 2018 000-27275
4 Open 4 document View SEC filing for 4 FORM 4 27 Feb 2018 23 Feb 2018 000-27275
4 Open 4 document View SEC filing for 4 FORM 4 26 Feb 2018 22 Feb 2018 000-27275
4 Open 4 document View SEC filing for 4 FORM 4 12 Feb 2018 08 Feb 2018 000-27275
4 Open 4 document View SEC filing for 4 FORM 4 28 Dec 2017 28 Dec 2017 000-27275
4 Open 4 document View SEC filing for 4 FORM 4 15 Dec 2017 15 Dec 2017 000-27275
4 Open 4 document View SEC filing for 4 FORM 4 16 Nov 2017 15 Nov 2017 000-27275
4 Open 4 document View SEC filing for 4 FORM 4 18 Oct 2017 16 Oct 2017 000-27275
4/A Open 4/A document View SEC filing for 4/A FORM 4/A 29 Sep 2017 15 Sep 2017 000-27275
4 Open 4 document View SEC filing for 4 FORM 4 18 Sep 2017 15 Sep 2017 000-27275
4 Open 4 document View SEC filing for 4 FORM 4 16 Aug 2017 15 Aug 2017 000-27275
4 Open 4 document View SEC filing for 4 FORM 4 17 Jul 2017 14 Jul 2017 000-27275
4 Open 4 document View SEC filing for 4 FORM 4 16 Jun 2017 15 Jun 2017 000-27275
4 Open 4 document View SEC filing for 4 FORM 4 01 Jun 2017 31 May 2017 000-27275
4 Open 4 document View SEC filing for 4 FORM 4 07 Mar 2017 03 Mar 2017 000-27275
4 Open 4 document View SEC filing for 4 FORM 4 27 Feb 2017 23 Feb 2017 000-27275
4 Open 4 document View SEC filing for 4 FORM 4 14 Feb 2017 11 Feb 2017 000-27275
4 Open 4 document View SEC filing for 4 FORM 4 10 Feb 2017 09 Feb 2017 000-27275
4 Open 4 document View SEC filing for 4 FORM 4 09 Feb 2017 07 Feb 2017 000-27275
5 Open 5 document View SEC filing for 5 FORM 5 06 Jan 2017 31 Dec 2016 000-27275
4 Open 4 document View SEC filing for 4 FORM 4 16 Dec 2016 15 Dec 2016 000-27275
4 Open 4 document View SEC filing for 4 FORM 4 16 Nov 2016 15 Nov 2016 000-27275
4 Open 4 document View SEC filing for 4 FORM 4 18 Oct 2016 17 Oct 2016 000-27275
4 Open 4 document View SEC filing for 4 FORM 4 19 Sep 2016 15 Sep 2016 000-27275
4 Open 4 document View SEC filing for 4 FORM 4 16 Aug 2016 15 Aug 2016 000-27275
4 Open 4 document View SEC filing for 4 FORM 4 18 Jul 2016 15 Jul 2016 000-27275
4 Open 4 document View SEC filing for 4 FORM 4 17 Jun 2016 16 Jun 2016 000-27275
4 Open 4 document View SEC filing for 4 FORM 4 17 May 2016 16 May 2016 000-27275
4 Open 4 document View SEC filing for 4 FORM 4 18 Apr 2016 15 Apr 2016 000-27275
4 Open 4 document View SEC filing for 4 FORM 4 17 Mar 2016 16 Mar 2016 000-27275
4 Open 4 document View SEC filing for 4 FORM 4 07 Mar 2016 03 Mar 2016 000-27275
4 Open 4 document View SEC filing for 4 FORM 4 17 Feb 2016 16 Feb 2016 000-27275
4 Open 4 document View SEC filing for 4 FORM 4 16 Feb 2016 11 Feb 2016 000-27275
4 Open 4 document View SEC filing for 4 FORM 4 10 Feb 2016 08 Feb 2016 000-27275
4 Open 4 document View SEC filing for 4 FORM 4 04 Jan 2016 30 Dec 2015 000-27275
4 Open 4 document View SEC filing for 4 FORM 4 16 Sep 2015 15 Sep 2015 000-27275
4 Open 4 document View SEC filing for 4 FORM 4 17 Feb 2015 12 Feb 2015 000-27275
4 Open 4 document View SEC filing for 4 FORM 4 11 Feb 2015 09 Feb 2015 000-27275
5 Open 5 document View SEC filing for 5 FORM 5 10 Feb 2015 31 Dec 2014 000-27275
4 Open 4 document View SEC filing for 4 FORM 4 06 Nov 2014 05 Nov 2014 000-27275
4 Open 4 document View SEC filing for 4 FORM 4 05 Aug 2014 01 Aug 2014 000-27275
4 Open 4 document View SEC filing for 4 FORM 4 10 Feb 2014 07 Feb 2014 000-27275
4 Open 4 document View SEC filing for 4 FORM 4 09 Dec 2013 05 Dec 2013 000-27275
4 Open 4 document View SEC filing for 4 FORM 4 11 Sep 2013 05 Aug 2013 000-27275
4 Open 4 document View SEC filing for 4 FORM 4 14 Mar 2013 13 Mar 2013 000-27275
4 Open 4 document View SEC filing for 4 PRIMARY DOCUMENT 11 Feb 2013 08 Feb 2013 000-27275
4 Open 4 document View SEC filing for 4 PRIMARY DOCUMENT 22 Oct 2012 27 Sep 2012 000-27275
4 Open 4 document View SEC filing for 4 PRIMARY DOCUMENT 27 Sep 2012 25 Sep 2012 000-27275
4 Open 4 document View SEC filing for 4 PRIMARY DOCUMENT 12 Sep 2012 10 Sep 2012 000-27275
4 Open 4 document View SEC filing for 4 PRIMARY DOCUMENT 30 Aug 2012 29 Aug 2012 000-27275
4 Open 4 document View SEC filing for 4 PRIMARY DOCUMENT 06 Jun 2012 05 Jun 2012 000-27275
4 Open 4 document View SEC filing for 4 PRIMARY DOCUMENT 30 May 2012 29 May 2012 000-27275
4 Open 4 document View SEC filing for 4 PRIMARY DOCUMENT 30 Apr 2012 27 Apr 2012 000-27275
4 Open 4 document View SEC filing for 4 PRIMARY DOCUMENT 20 Jul 2011 25 May 2011 000-27275
4 Open 4 document View SEC filing for 4 PRIMARY DOCUMENT 19 May 2011 19 May 2011 000-27275
5 Open 5 document View SEC filing for 5 PRIMARY DOCUMENT 21 Jan 2011 31 Dec 2010 000-27275

About this filer

F. THOMSON LEIGHTON files with the SEC under CIK 0001106232. This page aggregates EDGAR filings and related ownership activity.

See reporting owner transactions.

FAQ

What is a CIK?
A Central Index Key (CIK) is a unique identifier assigned by the SEC to each filer.
Why are some filings missing?
New filings appear as the SEC updates EDGAR, and older records can vary by availability.
How often is this page updated?
Updates follow new EDGAR submissions and periodic data refreshes.

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