David Mason

Business address
210 Broadway, Cambridge, MA, 02139
Top holdings (ownership)
SEMR and EVER
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David Mason has filed 68 SEC EDGAR filings since 27 Jun 2018

Latest Filings

Form type Document Filing Description Filing date Reporting date File number(s)
4 Open Document Open Filing FORM 4 17 Dec 2025 15 Dec 2025 001-40276
4 Open Document Open Filing FORM 4 02 Dec 2025 01 Dec 2025 001-40276
4 Open Document Open Filing FORM 4 03 Nov 2025 01 Nov 2025 001-40276
4 Open Document Open Filing FORM 4 02 Sep 2025 01 Sep 2025 001-40276
4 Open Document Open Filing FORM 4 04 Aug 2025 01 Aug 2025 001-40276
4 Open Document Open Filing FORM 4 04 Jun 2025 03 Jun 2025 001-40276
144 Open Document Open Filing 03 Jun 2025
4 Open Document Open Filing FORM 4 02 Jun 2025 01 Jun 2025 001-40276
4 Open Document Open Filing FORM 4 02 May 2025 01 May 2025 001-40276
4 Open Document Open Filing FORM 4 05 Mar 2025 01 Mar 2025 001-40276
4 Open Document Open Filing FORM 4 04 Feb 2025 03 Feb 2025 001-40276
4 Open Document Open Filing FORM 4 05 Nov 2024 04 Nov 2024 001-40276
4 Open Document Open Filing FORM 4 06 Aug 2024 02 Aug 2024 001-40276
4 Open Document Open Filing FORM 4 03 May 2024 02 May 2024 001-40276
4 Open Document Open Filing FORM 4 05 Mar 2024 01 Mar 2024 001-40276
4 Open Document Open Filing FORM 4 06 Feb 2024 02 Feb 2024 001-40276
4 Open Document Open Filing FORM 4 06 Nov 2023 02 Nov 2023 001-40276
4 Open Document Open Filing FORM 4 03 Nov 2022 01 Nov 2022 001-40276
3 Open Document Open Filing FORM 3 19 Oct 2022 17 Oct 2022 001-40276
4 Open Document Open Filing FORM 4 SUBMISSION 05 Oct 2022 03 Oct 2022 001-38549
4 Open Document Open Filing FORM 4 SUBMISSION 18 Aug 2022 17 Aug 2022 001-38549
4 Open Document Open Filing FORM 4 SUBMISSION 09 Aug 2022 08 Aug 2022 001-38549
4 Open Document Open Filing FORM 4 SUBMISSION 04 Aug 2022 02 Aug 2022 001-38549
4 Open Document Open Filing FORM 4 SUBMISSION 05 Jul 2022 30 Jun 2022 001-38549
4 Open Document Open Filing FORM 4 SUBMISSION 30 Jun 2022 28 Jun 2022 001-38549
4 Open Document Open Filing FORM 4 SUBMISSION 06 May 2022 05 May 2022 001-38549
4 Open Document Open Filing FORM 4 SUBMISSION 04 Apr 2022 01 Apr 2022 001-38549
4/A Open Document Open Filing FORM 4/A SUBMISSION 15 Feb 2022 11 Feb 2022 001-38549
4 Open Document Open Filing FORM 4 SUBMISSION 14 Feb 2022 11 Feb 2022 001-38549
4 Open Document Open Filing FORM 4 SUBMISSION 29 Dec 2021 28 Dec 2021 001-38549
4 Open Document Open Filing FORM 4 SUBMISSION 06 Aug 2021 04 Aug 2021 001-38549
4 Open Document Open Filing FORM 4 SUBMISSION 09 Jun 2021 07 Jun 2021 001-38549
4 Open Document Open Filing FORM 4 SUBMISSION 07 May 2021 05 May 2021 001-38549
4 Open Document Open Filing FORM 4 SUBMISSION 02 Apr 2021 31 Mar 2021 001-38549
4 Open Document Open Filing FORM 4 SUBMISSION 17 Mar 2021 15 Mar 2021 001-38549
4 Open Document Open Filing FORM 4 SUBMISSION 09 Mar 2021 08 Mar 2021 001-38549
4 Open Document Open Filing FORM 4 SUBMISSION 01 Mar 2021 25 Feb 2021 001-38549
4 Open Document Open Filing FORM 4 SUBMISSION 09 Nov 2020 06 Nov 2020 001-38549
4 Open Document Open Filing FORM 4 SUBMISSION 04 Nov 2020 02 Nov 2020 001-38549
4 Open Document Open Filing FORM 4 SUBMISSION 07 Oct 2020 05 Oct 2020 001-38549
4 Open Document Open Filing FORM 4 SUBMISSION 09 Sep 2020 04 Sep 2020 001-38549
4 Open Document Open Filing FORM 4 SUBMISSION 06 Jul 2020 01 Jul 2020 001-38549
4 Open Document Open Filing FORM 4 SUBMISSION 06 May 2020 04 May 2020 001-38549
4 Open Document Open Filing FORM 4 SUBMISSION 09 Apr 2020 06 Apr 2020 001-38549
4 Open Document Open Filing FORM 4 SUBMISSION 02 Mar 2020 27 Feb 2020 001-38549
4 Open Document Open Filing FORM 4 SUBMISSION 24 Feb 2020 20 Feb 2020 001-38549
4 Open Document Open Filing FORM 4 SUBMISSION 08 Nov 2019 08 Nov 2019 001-38549
4 Open Document Open Filing FORM 4 SUBMISSION 12 Aug 2019 08 Aug 2019 001-38549
4 Open Document Open Filing FORM 4 SUBMISSION 06 May 2019 02 May 2019 001-38549
4 Open Document Open Filing FORM 4 SUBMISSION 01 May 2019 29 Apr 2019 001-38549
4 Open Document Open Filing FORM 4 SUBMISSION 17 Apr 2019 15 Apr 2019 001-38549
4 Open Document Open Filing FORM 4 SUBMISSION 04 Apr 2019 01 Apr 2019 001-38549
4 Open Document Open Filing FORM 4 SUBMISSION 01 Apr 2019 29 Mar 2019 001-38549
4 Open Document Open Filing FORM 4 SUBMISSION 07 Mar 2019 05 Mar 2019 001-38549
4 Open Document Open Filing FORM 4 SUBMISSION 28 Feb 2019 26 Feb 2019 001-38549
4 Open Document Open Filing FORM 4 SUBMISSION 19 Feb 2019 15 Feb 2019 001-38549
4 Open Document Open Filing FORM 4 SUBMISSION 06 Feb 2019 04 Feb 2019 001-38549
4 Open Document Open Filing FORM 4 SUBMISSION 16 Jan 2019 14 Jan 2019 001-38549
4 Open Document Open Filing FORM 4 SUBMISSION 09 Jan 2019 07 Jan 2019 001-38549
4 Open Document Open Filing FORM 4 SUBMISSION 07 Jan 2019 04 Jan 2019 001-38549
4 Open Document Open Filing FORM 4 SUBMISSION 04 Jan 2019 02 Jan 2019 001-38549
4 Open Document Open Filing FORM 4 SUBMISSION 03 Jan 2019 31 Dec 2018 001-38549
4 Open Document Open Filing FORM 4 SUBMISSION 26 Dec 2018 21 Dec 2018 001-38549
4/A Open Document Open Filing FORM 4/A SUBMISSION 21 Aug 2018 28 Jun 2018 001-38549
4 Open Document Open Filing FORM 4 SUBMISSION 02 Aug 2018 01 Aug 2018 001-38549
3/A Open Document Open Filing FORM 3/A SUBMISSION 05 Jul 2018 27 Jun 2018 001-38549
4 Open Document Open Filing FORM 4 SUBMISSION 02 Jul 2018 28 Jun 2018 001-38549
3 Open Document Open Filing FORM 3 SUBMISSION 27 Jun 2018 27 Jun 2018 001-38549