Filer Snapshot

Stephen Williamson SEC EDGAR Filings

SEC filings, ownership reports, and insider transactions for CIK 0001648929.

Entity Type

Individual

Total Filings

102

Latest Filing

03 Mar 2026

Industry

n/a

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Review latest filings on this page Open reporting owner context
Business address
81 Wyman Street, Waltham, MA, 02451
Top holdings (ownership)
TMO, IFF, and HON

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Quick Takeaways

  • Stephen Williamson is an SEC filer tracked under CIK 0001648929.
  • 102 filings are listed on this profile.
  • Common form coverage includes 144, 4, 3 and more.

What Changed

  • Latest filing: 144 filed on 03 Mar 2026.
  • Report period: not specified in filing header.

Why This Matters

  • You can quote filing dates and form types directly from the SEC record on this page.
  • Use this profile before deeper ownership or insider analysis to confirm filing history context.

Official SEC Source

Official SEC Source

SEC EDGAR submissions for CIK 0001648929.

See Original Filing

Filer Overview

Stephen Williamson has filed 102 SEC EDGAR filings since 04 Aug 2015. Common forms include 144, 4, 3, 144/A and more.

Reporting owner transactions Latest 13F filings

Latest Filings

Recent SEC filings for Stephen Williamson with direct links to document and filing folders.

Form type Document Filing Description Filing date Reporting date File number(s)
144 Open 144 document View SEC filing for 144 03 Mar 2026
4 Open 4 document View SEC filing for 4 PRIMARY DOCUMENT 02 Mar 2026 28 Feb 2026 001-08002
4 Open 4 document View SEC filing for 4 PRIMARY DOCUMENT 27 Feb 2026 25 Feb 2026 001-08002
4 Open 4 document View SEC filing for 4 FORM 4 06 Jan 2026 02 Jan 2026 001-08974
4 Open 4 document View SEC filing for 4 PRIMARY DOCUMENT 17 Nov 2025 14 Nov 2025 001-08002
4 Open 4 document View SEC filing for 4 FORM 4 02 Oct 2025 01 Oct 2025 001-08974
4 Open 4 document View SEC filing for 4 PRIMARY DOCUMENT 02 Sep 2025 28 Aug 2025 001-08002
4 Open 4 document View SEC filing for 4 FORM 4 02 Jul 2025 01 Jul 2025 001-08974
4 Open 4 document View SEC filing for 4 FORM 4 21 May 2025 20 May 2025 001-08974
4 Open 4 document View SEC filing for 4 FORM 4 17 Apr 2025 15 Apr 2025 001-08974
3 Open 3 document View SEC filing for 3 FORM 3 03 Apr 2025 01 Apr 2025 001-08974
4 Open 4 document View SEC filing for 4 PRIMARY DOCUMENT 04 Mar 2025 28 Feb 2025 001-08002
4 Open 4 document View SEC filing for 4 PRIMARY DOCUMENT 21 Feb 2025 19 Feb 2025 001-08002
4 Open 4 document View SEC filing for 4 PRIMARY DOCUMENT 05 Feb 2025 03 Feb 2025 001-08002
144/A Open 144/A document View SEC filing for 144/A 05 Feb 2025
144/A Open 144/A document View SEC filing for 144/A 05 Feb 2025
144 Open 144 document View SEC filing for 144 04 Feb 2025
144 Open 144 document View SEC filing for 144 03 Feb 2025
4 Open 4 document View SEC filing for 4 PRIMARY DOCUMENT 29 Aug 2024 28 Aug 2024 001-08002
4 Open 4 document View SEC filing for 4 PRIMARY DOCUMENT 27 Aug 2024 23 Aug 2024 001-08002
4 Open 4 document View SEC filing for 4 PRIMARY DOCUMENT 29 May 2024 28 May 2024 001-08002
4 Open 4 document View SEC filing for 4 PRIMARY DOCUMENT 15 May 2024 13 May 2024 001-08002
144 Open 144 document View SEC filing for 144 13 May 2024
4 Open 4 document View SEC filing for 4 PRIMARY DOCUMENT 29 Feb 2024 28 Feb 2024 001-08002
4 Open 4 document View SEC filing for 4 PRIMARY DOCUMENT 26 Feb 2024 23 Feb 2024 001-08002
4 Open 4 document View SEC filing for 4 PRIMARY DOCUMENT 23 Feb 2024 21 Feb 2024 001-08002
4 Open 4 document View SEC filing for 4 PRIMARY DOCUMENT 29 Aug 2023 25 Aug 2023 001-08002
4 Open 4 document View SEC filing for 4 PRIMARY DOCUMENT 25 Aug 2023 23 Aug 2023 001-08002
4 Open 4 document View SEC filing for 4 PRIMARY DOCUMENT 02 Aug 2023 31 Jul 2023 001-08002
144 Open 144 document View SEC filing for 144 01 Aug 2023
144 Open 144 document View SEC filing for 144 31 Jul 2023
4 Open 4 document View SEC filing for 4 PRIMARY DOCUMENT 02 Mar 2023 28 Feb 2023 001-08002
4 Open 4 document View SEC filing for 4 PRIMARY DOCUMENT 24 Feb 2023 22 Feb 2023 001-08002
4 Open 4 document View SEC filing for 4 PRIMARY DOCUMENT 15 Dec 2022 15 Nov 2022 001-08002
4 Open 4 document View SEC filing for 4 03 Nov 2022 01 Nov 2022 001-04858
4 Open 4 document View SEC filing for 4 PRIMARY DOCUMENT 29 Aug 2022 25 Aug 2022 001-08002
4 Open 4 document View SEC filing for 4 PRIMARY DOCUMENT 24 Aug 2022 23 Aug 2022 001-08002
4 Open 4 document View SEC filing for 4 PRIMARY DOCUMENT 16 Aug 2022 12 Aug 2022 001-08002
4 Open 4 document View SEC filing for 4 06 May 2022 04 May 2022 001-04858
4 Open 4 document View SEC filing for 4 PRIMARY DOCUMENT 01 Mar 2022 25 Feb 2022 001-08002
4 Open 4 document View SEC filing for 4 PRIMARY DOCUMENT 25 Feb 2022 23 Feb 2022 001-08002
4 Open 4 document View SEC filing for 4 03 Nov 2021 01 Nov 2021 001-04858
4 Open 4 document View SEC filing for 4 PRIMARY DOCUMENT 03 Nov 2021 02 Nov 2021 001-08002
4 Open 4 document View SEC filing for 4 PRIMARY DOCUMENT 30 Aug 2021 26 Aug 2021 001-08002
4 Open 4 document View SEC filing for 4 PRIMARY DOCUMENT 26 Aug 2021 25 Aug 2021 001-08002
4 Open 4 document View SEC filing for 4 PRIMARY DOCUMENT 24 Aug 2021 23 Aug 2021 001-08002
4 Open 4 document View SEC filing for 4 07 May 2021 05 May 2021 001-04858
4 Open 4 document View SEC filing for 4 PRIMARY DOCUMENT 01 Mar 2021 25 Feb 2021 001-08002
4 Open 4 document View SEC filing for 4 PRIMARY DOCUMENT 25 Feb 2021 23 Feb 2021 001-08002
4 Open 4 document View SEC filing for 4 04 Nov 2020 02 Nov 2020 001-04858
4 Open 4 document View SEC filing for 4 PRIMARY DOCUMENT 11 Sep 2020 26 Aug 2020 001-08002
4 Open 4 document View SEC filing for 4 PRIMARY DOCUMENT 31 Aug 2020 27 Aug 2020 001-08002
4 Open 4 document View SEC filing for 4 PRIMARY DOCUMENT 27 Aug 2020 25 Aug 2020 001-08002
4 Open 4 document View SEC filing for 4 PRIMARY DOCUMENT 31 Jul 2020 29 Jul 2020 001-08002
4 Open 4 document View SEC filing for 4 PRIMARY DOCUMENT 02 Jun 2020 01 Jun 2020 001-08002
4 Open 4 document View SEC filing for 4 08 May 2020 06 May 2020 001-04858
4 Open 4 document View SEC filing for 4 05 May 2020 01 May 2020 001-04858
4 Open 4 document View SEC filing for 4 PRIMARY DOCUMENT 05 Mar 2020 04 Mar 2020 001-08002
4 Open 4 document View SEC filing for 4 PRIMARY DOCUMENT 04 Mar 2020 02 Mar 2020 001-08002
4 Open 4 document View SEC filing for 4 PRIMARY DOCUMENT 28 Feb 2020 27 Feb 2020 001-08002
4 Open 4 document View SEC filing for 4 PRIMARY DOCUMENT 27 Feb 2020 25 Feb 2020 001-08002
4 Open 4 document View SEC filing for 4 PRIMARY DOCUMENT 05 Feb 2020 03 Feb 2020 001-08002
4 Open 4 document View SEC filing for 4 05 Nov 2019 01 Nov 2019 001-04858
4 Open 4 document View SEC filing for 4 PRIMARY DOCUMENT 29 Aug 2019 27 Aug 2019 001-08002
4 Open 4 document View SEC filing for 4 PRIMARY DOCUMENT 27 Aug 2019 24 Aug 2019 001-08002
4 Open 4 document View SEC filing for 4 PRIMARY DOCUMENT 04 Jun 2019 03 Jun 2019 001-08002
4 Open 4 document View SEC filing for 4 03 May 2019 01 May 2019 001-04858
4 Open 4 document View SEC filing for 4 PRIMARY DOCUMENT 05 Mar 2019 04 Mar 2019 001-08002
4 Open 4 document View SEC filing for 4 PRIMARY DOCUMENT 01 Mar 2019 28 Feb 2019 001-08002
4 Open 4 document View SEC filing for 4 PRIMARY DOCUMENT 28 Feb 2019 26 Feb 2019 001-08002
5 Open 5 document View SEC filing for 5 14 Feb 2019 31 Dec 2018 001-04858
4 Open 4 document View SEC filing for 4 PRIMARY DOCUMENT 11 Dec 2018 07 Dec 2018 001-08002
4 Open 4 document View SEC filing for 4 02 Nov 2018 31 Oct 2018 001-04858
4 Open 4 document View SEC filing for 4 05 Sep 2018 01 Sep 2018 001-04858
4 Open 4 document View SEC filing for 4 PRIMARY DOCUMENT 30 Aug 2018 28 Aug 2018 001-08002
4 Open 4 document View SEC filing for 4 PRIMARY DOCUMENT 28 Aug 2018 24 Aug 2018 001-08002
4 Open 4 document View SEC filing for 4 PRIMARY DOCUMENT 04 Jun 2018 04 Jun 2018 001-08002
4 Open 4 document View SEC filing for 4 03 May 2018 02 May 2018 001-04858
4 Open 4 document View SEC filing for 4 PRIMARY DOCUMENT 06 Mar 2018 05 Mar 2018 001-08002
4 Open 4 document View SEC filing for 4 PRIMARY DOCUMENT 01 Mar 2018 27 Feb 2018 001-08002
4 Open 4 document View SEC filing for 4 PRIMARY DOCUMENT 27 Feb 2018 23 Feb 2018 001-08002
4 Open 4 document View SEC filing for 4 PRIMARY DOCUMENT 08 Feb 2018 07 Feb 2018 001-08002
4 Open 4 document View SEC filing for 4 01 Nov 2017 31 Oct 2017 001-04858
4 Open 4 document View SEC filing for 4 05 Sep 2017 01 Sep 2017 001-04858
4 Open 4 document View SEC filing for 4 PRIMARY DOCUMENT 29 Aug 2017 28 Aug 2017 001-08002
4 Open 4 document View SEC filing for 4 PRIMARY DOCUMENT 28 Aug 2017 24 Aug 2017 001-08002
3 Open 3 document View SEC filing for 3 02 Aug 2017 01 Aug 2017 001-04858
4 Open 4 document View SEC filing for 4 PRIMARY DOCUMENT 06 Jun 2017 05 Jun 2017 001-08002
4 Open 4 document View SEC filing for 4 PRIMARY DOCUMENT 08 Mar 2017 06 Mar 2017 001-08002
4 Open 4 document View SEC filing for 4 PRIMARY DOCUMENT 02 Mar 2017 28 Feb 2017 001-08002
4 Open 4 document View SEC filing for 4 PRIMARY DOCUMENT 28 Feb 2017 24 Feb 2017 001-08002
4 Open 4 document View SEC filing for 4 PRIMARY DOCUMENT 30 Aug 2016 26 Aug 2016 001-08002
4 Open 4 document View SEC filing for 4 PRIMARY DOCUMENT 29 Aug 2016 25 Aug 2016 001-08002
4 Open 4 document View SEC filing for 4 PRIMARY DOCUMENT 26 Aug 2016 24 Aug 2016 001-08002
4 Open 4 document View SEC filing for 4 PRIMARY DOCUMENT 26 May 2016 24 May 2016 001-08002
4 Open 4 document View SEC filing for 4 PRIMARY DOCUMENT 23 Mar 2016 21 Mar 2016 001-08002
4 Open 4 document View SEC filing for 4 PRIMARY DOCUMENT 01 Mar 2016 26 Feb 2016 001-08002
4 Open 4 document View SEC filing for 4 PRIMARY DOCUMENT 29 Feb 2016 25 Feb 2016 001-08002
4 Open 4 document View SEC filing for 4 PRIMARY DOCUMENT 26 Feb 2016 24 Feb 2016 001-08002
4 Open 4 document View SEC filing for 4 PRIMARY DOCUMENT 27 Aug 2015 26 Aug 2015 001-08002
4 Open 4 document View SEC filing for 4 PRIMARY DOCUMENT 26 Aug 2015 25 Aug 2015 001-08002
3 Open 3 document View SEC filing for 3 PRIMARY DOCUMENT 04 Aug 2015 01 Aug 2015 001-08002

About this filer

Stephen Williamson files with the SEC under CIK 0001648929. This page aggregates EDGAR filings and related ownership activity.

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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