Stephen Williamson

Entity
Individual
Business address
81 Wyman Street, 02451 Waltham, MA
Insider ownership signature
/s/ Melodie T. Morin, Attorney-in-Fact for Stephen Williamson
All SEC filings
View on sec.gov
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Stephen Williamson has filed 98 SEC EDGAR filings since 8/4/2015

Latest Filings

Form type Document Filing Description Filing date Reporting date File number(s)
4 Open Document Open Filing PRIMARY DOCUMENT Nov 17, 2025 Nov 14, 2025 001-08002
4 Open Document Open Filing FORM 4 Oct 2, 2025 Oct 1, 2025 001-08974
4 Open Document Open Filing PRIMARY DOCUMENT Sep 2, 2025 Aug 28, 2025 001-08002
4 Open Document Open Filing FORM 4 Jul 2, 2025 Jul 1, 2025 001-08974
4 Open Document Open Filing FORM 4 May 21, 2025 May 20, 2025 001-08974
4 Open Document Open Filing FORM 4 Apr 17, 2025 Apr 15, 2025 001-08974
3 Open Document Open Filing FORM 3 Apr 3, 2025 Apr 1, 2025 001-08974
4 Open Document Open Filing PRIMARY DOCUMENT Mar 4, 2025 Feb 28, 2025 001-08002
4 Open Document Open Filing PRIMARY DOCUMENT Feb 21, 2025 Feb 19, 2025 001-08002
4 Open Document Open Filing PRIMARY DOCUMENT Feb 5, 2025 Feb 3, 2025 001-08002
144/A Open Document Open Filing Feb 5, 2025
144/A Open Document Open Filing Feb 5, 2025
144 Open Document Open Filing Feb 4, 2025
144 Open Document Open Filing Feb 3, 2025
4 Open Document Open Filing PRIMARY DOCUMENT Aug 29, 2024 Aug 28, 2024 001-08002
4 Open Document Open Filing PRIMARY DOCUMENT Aug 27, 2024 Aug 23, 2024 001-08002
4 Open Document Open Filing PRIMARY DOCUMENT May 29, 2024 May 28, 2024 001-08002
4 Open Document Open Filing PRIMARY DOCUMENT May 15, 2024 May 13, 2024 001-08002
144 Open Document Open Filing May 13, 2024
4 Open Document Open Filing PRIMARY DOCUMENT Feb 29, 2024 Feb 28, 2024 001-08002
4 Open Document Open Filing PRIMARY DOCUMENT Feb 26, 2024 Feb 23, 2024 001-08002
4 Open Document Open Filing PRIMARY DOCUMENT Feb 23, 2024 Feb 21, 2024 001-08002
4 Open Document Open Filing PRIMARY DOCUMENT Aug 29, 2023 Aug 25, 2023 001-08002
4 Open Document Open Filing PRIMARY DOCUMENT Aug 25, 2023 Aug 23, 2023 001-08002
4 Open Document Open Filing PRIMARY DOCUMENT Aug 2, 2023 Jul 31, 2023 001-08002
144 Open Document Open Filing Aug 1, 2023
144 Open Document Open Filing Jul 31, 2023
4 Open Document Open Filing PRIMARY DOCUMENT Mar 2, 2023 Feb 28, 2023 001-08002
4 Open Document Open Filing PRIMARY DOCUMENT Feb 24, 2023 Feb 22, 2023 001-08002
4 Open Document Open Filing PRIMARY DOCUMENT Dec 15, 2022 Nov 15, 2022 001-08002
4 Open Document Open Filing Nov 3, 2022 Nov 1, 2022 001-04858
4 Open Document Open Filing PRIMARY DOCUMENT Aug 29, 2022 Aug 25, 2022 001-08002
4 Open Document Open Filing PRIMARY DOCUMENT Aug 24, 2022 Aug 23, 2022 001-08002
4 Open Document Open Filing PRIMARY DOCUMENT Aug 16, 2022 Aug 12, 2022 001-08002
4 Open Document Open Filing May 6, 2022 May 4, 2022 001-04858
4 Open Document Open Filing PRIMARY DOCUMENT Mar 1, 2022 Feb 25, 2022 001-08002
4 Open Document Open Filing PRIMARY DOCUMENT Feb 25, 2022 Feb 23, 2022 001-08002
4 Open Document Open Filing Nov 3, 2021 Nov 1, 2021 001-04858
4 Open Document Open Filing PRIMARY DOCUMENT Nov 3, 2021 Nov 2, 2021 001-08002
4 Open Document Open Filing PRIMARY DOCUMENT Aug 30, 2021 Aug 26, 2021 001-08002
4 Open Document Open Filing PRIMARY DOCUMENT Aug 26, 2021 Aug 25, 2021 001-08002
4 Open Document Open Filing PRIMARY DOCUMENT Aug 24, 2021 Aug 23, 2021 001-08002
4 Open Document Open Filing May 7, 2021 May 5, 2021 001-04858
4 Open Document Open Filing PRIMARY DOCUMENT Mar 1, 2021 Feb 25, 2021 001-08002
4 Open Document Open Filing PRIMARY DOCUMENT Feb 25, 2021 Feb 23, 2021 001-08002
4 Open Document Open Filing Nov 4, 2020 Nov 2, 2020 001-04858
4 Open Document Open Filing PRIMARY DOCUMENT Sep 11, 2020 Aug 26, 2020 001-08002
4 Open Document Open Filing PRIMARY DOCUMENT Aug 31, 2020 Aug 27, 2020 001-08002
4 Open Document Open Filing PRIMARY DOCUMENT Aug 27, 2020 Aug 25, 2020 001-08002
4 Open Document Open Filing PRIMARY DOCUMENT Jul 31, 2020 Jul 29, 2020 001-08002
4 Open Document Open Filing PRIMARY DOCUMENT Jun 2, 2020 Jun 1, 2020 001-08002
4 Open Document Open Filing May 8, 2020 May 6, 2020 001-04858
4 Open Document Open Filing May 5, 2020 May 1, 2020 001-04858
4 Open Document Open Filing PRIMARY DOCUMENT Mar 5, 2020 Mar 4, 2020 001-08002
4 Open Document Open Filing PRIMARY DOCUMENT Mar 4, 2020 Mar 2, 2020 001-08002
4 Open Document Open Filing PRIMARY DOCUMENT Feb 28, 2020 Feb 27, 2020 001-08002
4 Open Document Open Filing PRIMARY DOCUMENT Feb 27, 2020 Feb 25, 2020 001-08002
4 Open Document Open Filing PRIMARY DOCUMENT Feb 5, 2020 Feb 3, 2020 001-08002
4 Open Document Open Filing Nov 5, 2019 Nov 1, 2019 001-04858
4 Open Document Open Filing PRIMARY DOCUMENT Aug 29, 2019 Aug 27, 2019 001-08002
4 Open Document Open Filing PRIMARY DOCUMENT Aug 27, 2019 Aug 24, 2019 001-08002
4 Open Document Open Filing PRIMARY DOCUMENT Jun 4, 2019 Jun 3, 2019 001-08002
4 Open Document Open Filing May 3, 2019 May 1, 2019 001-04858
4 Open Document Open Filing PRIMARY DOCUMENT Mar 5, 2019 Mar 4, 2019 001-08002
4 Open Document Open Filing PRIMARY DOCUMENT Mar 1, 2019 Feb 28, 2019 001-08002
4 Open Document Open Filing PRIMARY DOCUMENT Feb 28, 2019 Feb 26, 2019 001-08002
5 Open Document Open Filing Feb 14, 2019 Dec 31, 2018 001-04858
4 Open Document Open Filing PRIMARY DOCUMENT Dec 11, 2018 Dec 7, 2018 001-08002
4 Open Document Open Filing Nov 2, 2018 Oct 31, 2018 001-04858
4 Open Document Open Filing Sep 5, 2018 Sep 1, 2018 001-04858
4 Open Document Open Filing PRIMARY DOCUMENT Aug 30, 2018 Aug 28, 2018 001-08002
4 Open Document Open Filing PRIMARY DOCUMENT Aug 28, 2018 Aug 24, 2018 001-08002
4 Open Document Open Filing PRIMARY DOCUMENT Jun 4, 2018 Jun 4, 2018 001-08002
4 Open Document Open Filing May 3, 2018 May 2, 2018 001-04858
4 Open Document Open Filing PRIMARY DOCUMENT Mar 6, 2018 Mar 5, 2018 001-08002
4 Open Document Open Filing PRIMARY DOCUMENT Mar 1, 2018 Feb 27, 2018 001-08002
4 Open Document Open Filing PRIMARY DOCUMENT Feb 27, 2018 Feb 23, 2018 001-08002
4 Open Document Open Filing PRIMARY DOCUMENT Feb 8, 2018 Feb 7, 2018 001-08002
4 Open Document Open Filing Nov 1, 2017 Oct 31, 2017 001-04858
4 Open Document Open Filing Sep 5, 2017 Sep 1, 2017 001-04858
4 Open Document Open Filing PRIMARY DOCUMENT Aug 29, 2017 Aug 28, 2017 001-08002
4 Open Document Open Filing PRIMARY DOCUMENT Aug 28, 2017 Aug 24, 2017 001-08002
3 Open Document Open Filing Aug 2, 2017 Aug 1, 2017 001-04858
4 Open Document Open Filing PRIMARY DOCUMENT Jun 6, 2017 Jun 5, 2017 001-08002
4 Open Document Open Filing PRIMARY DOCUMENT Mar 8, 2017 Mar 6, 2017 001-08002
4 Open Document Open Filing PRIMARY DOCUMENT Mar 2, 2017 Feb 28, 2017 001-08002
4 Open Document Open Filing PRIMARY DOCUMENT Feb 28, 2017 Feb 24, 2017 001-08002
4 Open Document Open Filing PRIMARY DOCUMENT Aug 30, 2016 Aug 26, 2016 001-08002
4 Open Document Open Filing PRIMARY DOCUMENT Aug 29, 2016 Aug 25, 2016 001-08002
4 Open Document Open Filing PRIMARY DOCUMENT Aug 26, 2016 Aug 24, 2016 001-08002
4 Open Document Open Filing PRIMARY DOCUMENT May 26, 2016 May 24, 2016 001-08002
4 Open Document Open Filing PRIMARY DOCUMENT Mar 23, 2016 Mar 21, 2016 001-08002
4 Open Document Open Filing PRIMARY DOCUMENT Mar 1, 2016 Feb 26, 2016 001-08002
4 Open Document Open Filing PRIMARY DOCUMENT Feb 29, 2016 Feb 25, 2016 001-08002
4 Open Document Open Filing PRIMARY DOCUMENT Feb 26, 2016 Feb 24, 2016 001-08002
4 Open Document Open Filing PRIMARY DOCUMENT Aug 27, 2015 Aug 26, 2015 001-08002
4 Open Document Open Filing PRIMARY DOCUMENT Aug 26, 2015 Aug 25, 2015 001-08002
3 Open Document Open Filing PRIMARY DOCUMENT Aug 4, 2015 Aug 1, 2015 001-08002