Atlas Venture Fund X, L.P.

Business address
400 Technology Square, 10 Th Floor, Cambridge, MA, 02139
Top holdings (ownership)
KYMR, IRON, GBIO, and QTTB
State of incorporation
DE
Fiscal year end
31 December
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Atlas Venture Fund X, L.P. has filed 112 SEC EDGAR filings since 18 Dec 2014

Latest Filings

Form type Document Filing Description Filing date Reporting date File number(s)
144 Open Document Open Filing 16 Dec 2025
144 Open Document Open Filing 16 Dec 2025
144 Open Document Open Filing 15 Dec 2025
144 Open Document Open Filing 15 Dec 2025
144 Open Document Open Filing 12 Dec 2025
144 Open Document Open Filing 12 Dec 2025
144 Open Document Open Filing 11 Dec 2025
144 Open Document Open Filing 10 Dec 2025
144 Open Document Open Filing 17 Oct 2025
144 Open Document Open Filing 16 Oct 2025
144 Open Document Open Filing 15 Oct 2025
144 Open Document Open Filing 22 Aug 2025
SCHEDULE 13D/A Open Document Open Filing 15 Aug 2025
144 Open Document Open Filing 14 Aug 2025
144 Open Document Open Filing 13 Aug 2025
144 Open Document Open Filing 05 Aug 2025
144 Open Document Open Filing 30 Jul 2025
SCHEDULE 13D/A Open Document Open Filing 29 Jul 2025
144 Open Document Open Filing 24 Jul 2025
144 Open Document Open Filing 23 Jul 2025
144 Open Document Open Filing 18 Jul 2025
144 Open Document Open Filing 05 Feb 2025
144 Open Document Open Filing 04 Feb 2025
144 Open Document Open Filing 03 Feb 2025
SC 13G/A Open Document Open Filing SC 13G/A 14 Nov 2024
SC 13D/A Open Document Open Filing SC 13D/A 28 Oct 2024
144 Open Document Open Filing 09 Jul 2024
144 Open Document Open Filing 13 Jun 2024
144 Open Document Open Filing 12 Jun 2024
SC 13D Open Document Open Filing SC 13D 01 Apr 2024
3 Open Document Open Filing 3 27 Mar 2024 25 Mar 2024 001-38433
144 Open Document Open Filing 15 Mar 2024
144 Open Document Open Filing 14 Mar 2024
4 Open Document Open Filing 13 Mar 2024 11 Mar 2024 001-39460
144 Open Document Open Filing 13 Mar 2024
144 Open Document Open Filing 12 Mar 2024
144 Open Document Open Filing 11 Mar 2024
144 Open Document Open Filing 05 Mar 2024
SC 13G/A Open Document Open Filing SC 13G/A 09 Feb 2024
SC 13G/A Open Document Open Filing SC 13G/A 09 Feb 2024
SC 13D/A Open Document Open Filing SC 13D/A 25 Jan 2024
4 Open Document Open Filing FORM 4 SUBMISSION 25 Jan 2024 23 Jan 2024 001-39438
144 Open Document Open Filing 23 Jan 2024
4 Open Document Open Filing FORM 4 SUBMISSION 12 Jan 2024 10 Jan 2024 001-39438
144 Open Document Open Filing 10 Jan 2024
4 Open Document Open Filing FORM 4 SUBMISSION 14 Dec 2023 12 Dec 2023 001-39438
144 Open Document Open Filing 12 Dec 2023
SC 13D/A Open Document Open Filing SC 13D/A 21 Sep 2023
4 Open Document Open Filing FORM 4 SUBMISSION 18 Sep 2023 14 Sep 2023 001-39438
144 Open Document Open Filing 15 Sep 2023
SC 13D/A Open Document Open Filing SC 13D/A 15 Sep 2023
144 Open Document Open Filing 14 Sep 2023
4 Open Document Open Filing FORM 4 SUBMISSION 16 Aug 2023 14 Aug 2023 001-39438
144 Open Document Open Filing 15 Aug 2023
144 Open Document Open Filing 14 Aug 2023
SC 13G/A Open Document Open Filing AMENDMENT TO FORM SC 13G 14 Feb 2023
SC 13D/A Open Document Open Filing AMENDMENT TO FORM SC 13D 14 Feb 2023
4 Open Document Open Filing FORM 4 SUBMISSION 13 Jan 2023 11 Jan 2023 001-39460
4 Open Document Open Filing FORM 4 SUBMISSION 03 Jan 2023 29 Dec 2022 001-39438
4 Open Document Open Filing FORM 4 SUBMISSION 16 Dec 2022 14 Dec 2022 001-39460
SC 13D/A Open Document Open Filing AMENDMENT TO FORM SC 13D 06 Dec 2022
4 Open Document Open Filing FORM 4 SUBMISSION 04 Nov 2022 02 Nov 2022 001-39460
4 Open Document Open Filing FORM 4 SUBMISSION 01 Nov 2022 28 Oct 2022 001-39460
SC 13D/A Open Document Open Filing AMENDMENT TO FORM SC 13D 14 Sep 2022
SC 13D/A Open Document Open Filing AMENDMENT TO FORM SC 13D 05 May 2022
SC 13D Open Document Open Filing SCHEDULE 13D 11 Feb 2022
SC 13G/A Open Document Open Filing AMENDMENT TO SC 13G 11 Feb 2022
SC 13G/A Open Document Open Filing AMENDMENT TO SC 13G 11 Feb 2022
4 Open Document Open Filing FORM 4 SUBMISSION 21 Sep 2021 17 Sep 2021 001-39319
4 Open Document Open Filing FORM 4 SUBMISSION 21 Jun 2021 16 Jun 2021 001-39319
4 Open Document Open Filing FORM 4 SUBMISSION 18 May 2021 18 May 2021 001-39460
4 Open Document Open Filing FORM 4 SUBMISSION 01 Apr 2021 30 Mar 2021 001-40287
3 Open Document Open Filing FORM 3 SUBMISSION 25 Mar 2021 25 Mar 2021 001-40287
4 Open Document Open Filing FORM 4 SUBMISSION 18 Mar 2021 16 Mar 2021 001-39319
4 Open Document Open Filing FORM 4 SUBMISSION 22 Feb 2021 18 Feb 2021 001-39460
SC 13D/A Open Document Open Filing AMENDED ACQUISITION OF BENEFICIAL OWNERSHIP 17 Feb 2021
4 Open Document Open Filing FORM 4 SUBMISSION 16 Feb 2021 11 Feb 2021 001-38541
SC 13D/A Open Document Open Filing AMENDED ACQUISITION OF BENEFICIAL OWNERSHIP 16 Feb 2021
SC 13G Open Document Open Filing SCHEDULE FILED TO REPORT ACQUISITION OF BENEFICIAL OWNERSHIP 16 Feb 2021
SC 13G Open Document Open Filing SCHEDULE FILED TO REPORT ACQUISITION OF BENEFICIAL OWNERSHIP 16 Feb 2021
SC 13D Open Document Open Filing SCHEDULE 13D 16 Feb 2021
3 Open Document Open Filing 11 Feb 2021 05 Feb 2021 001-39438
4 Open Document Open Filing FORM 4 SUBMISSION 17 Dec 2020 15 Dec 2020 001-39319
SC 13D/A Open Document Open Filing AMENDMENT TO FORM SC 13D 17 Sep 2020
4 Open Document Open Filing FORM 4 SUBMISSION 17 Sep 2020 15 Sep 2020 001-38596
4 Open Document Open Filing FORM 4 SUBMISSION 25 Aug 2020 25 Aug 2020 001-39460
3 Open Document Open Filing FORM 3 SUBMISSION 20 Aug 2020 20 Aug 2020 001-39460
SC 13D Open Document Open Filing ACQUISITION OF BENEFICIAL OWNERSHIP 14 Jul 2020
4 Open Document Open Filing FORM 4 SUBMISSION 07 Jul 2020 02 Jul 2020 001-38596
SC 13D/A Open Document Open Filing AMENDMENT TO FORM SC 13D 07 Jul 2020
SC 13D/A Open Document Open Filing AMENDMENT TO FORM SC 13D 19 Jun 2020
4 Open Document Open Filing FORM 4 SUBMISSION 18 Jun 2020 16 Jun 2020 001-39319
4 Open Document Open Filing FORM 4 SUBMISSION 18 Jun 2020 16 Jun 2020 001-38596
3 Open Document Open Filing FORM 3 SUBMISSION 11 Jun 2020 11 Jun 2020 001-39319
SC 13G/A Open Document Open Filing SC 13G/A 13 Feb 2020
SC 13D Open Document Open Filing SC 13D 25 Nov 2019
SC 13D Open Document Open Filing SCHEDULE 13D 30 Jul 2019
4/A Open Document Open Filing FORM 4/A SUBMISSION 29 Jul 2019 19 Jul 2019 001-38537
4 Open Document Open Filing FORM 4 SUBMISSION 23 Jul 2019 19 Jul 2019 001-38537
4 Open Document Open Filing FORM 4 SUBMISSION 22 Mar 2019 20 Mar 2019 001-38541
4 Open Document Open Filing FORM 4 SUBMISSION 14 Feb 2019 12 Feb 2019 001-38596
SC 13G Open Document Open Filing SCHEDULE 13G 13 Feb 2019
SC 13G Open Document Open Filing SCHEDULE 13G 13 Feb 2019
SC 13G Open Document Open Filing SCHEDULE 13G 13 Feb 2019
4 Open Document Open Filing 4 26 Jul 2018 24 Jul 2018 001-38596
3 Open Document Open Filing 3 19 Jul 2018 19 Jul 2018 001-38596
4 Open Document Open Filing FORM 4 SUBMISSION 27 Jun 2018 25 Jun 2018 001-38541
4 Open Document Open Filing FORM 4 SUBMISSION 25 Jun 2018 25 Jun 2018 001-38537
3 Open Document Open Filing FORM 3 SUBMISSION 20 Jun 2018 20 Jun 2018 001-38541
3 Open Document Open Filing FORM 3 SUBMISSION 20 Jun 2018 20 Jun 2018 001-38537
SC 13D Open Document Open Filing SC 13D 14 Mar 2018
D Open Document Open Filing 18 Dec 2014 021-230375