Stephen Williamson

Business address
81 Wyman Street, Waltham, MA, 02451
Top holdings (ownership)
TMO, IFF, and HON
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Stephen Williamson has filed 98 SEC EDGAR filings since 04 Aug 2015

Latest Filings

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