Atlas Venture Fund X, L.P.

CIK 0001628098

1 SPAC with a current declared position, filed between Jan 25, 2024 and Jan 25, 2024. 0 of them were re-affirmed in the last 12 months. The rest are the filer’s last word on a position, not proof it is still held: an amendment is only required on a material change, so a fund that sells below 5% may never file again.

This filer has not filed a Schedule 13 on any SPAC since Jan 25, 2024. Read the page below as a record of what was declared, not as a register of what is held.

SPACs declared

every position whose latest statement stands — the record

Re-affirmed in 12 months

filed inside 365 days — what a reader means by "owns"

Still live

positions in SPACs still searching or in an announced deal

Median stake

5.8%

no percentage stated on the cover pages

1 activist (13D)26 superseded statements on file

Positions

one row per SPAC — every figure read from the accession in the Source column

1 of 1 shown · 1 position has not been amended in over a year

	SPAC			Voting	Dispositive			Source
FSDC	FS Development Corp.8 reporting persons on this schedule	5.8%	1,402,186	0 / 1,402,186	0 / 1,402,186	Closed (deSPAC)	Jan 25, 2024Stale	SC 13D/A · may seek to influence control0001104659-24-006716 26 earlier statements

26 superseded statements (newest 4 shown)

An amendment replaces a stake as current; it never erases the record of it. These are the earlier statements, each with the accession that replaced it — kept because “what did this filer say in 2022” is a different question from “what does it say now”, and only the second one has an answer above.

FSDC FS Development Corp.0.2% · SC 13D/A Jan 25, 2024replaced Feb 16, 2021 by 0001839882-21-002166
FSDC FS Development Corp.7.0% · SC 13D/A Sep 21, 2023replaced Jan 25, 2024 by 0001104659-24-006716
FSDC FS Development Corp.12.9% · SC 13D/A Feb 14, 2023replaced Sep 21, 2023 by 0001104659-23-102844
FSDC FS Development Corp.8.9% · SC 13D Feb 16, 2021replaced Feb 14, 2023 by 0001387131-23-002058

Reporting persons on this filer's schedules

one filer, several names — collapsed once, shown in full

A joint Schedule 13 names every person who beneficially owns the shares — the management company, the funds it advises, the general partner and often the individual who controls all three. They report the same shares. Counting them separately would publish this filer’s footprint two or three times over, so they are counted once, under CIK 0001628098. This filer has named 8 of them across the schedules in the table above:

Atlas Venture Associates Opportunity I
Atlas Venture Associates Opportunity Ii
Atlas Venture Associates X
Atlas Venture Associates XII
Atlas Venture Fund X
Atlas Venture Fund Xii
Atlas Venture Opportunity Fund I
Atlas Venture Opportunity Fund II

Appears alongside

other filers with a current declared position in the same SPACs

Co-occurrence in the disclosure record, and nothing more. It is not evidence of a group, an agreement or acting in concert — filers who act as a group say so on the cover page and file a 13D. Two arbitrage funds above 5% in the same shell is the ordinary shape of this market. The second number restricts both sides to statements filed in the last 12 months, because a 2021 stake beside a 2026 one is two facts about two different years.

Every percentage above is the one printed on the cover page of the filing cited beside it — a percentage of the shares outstanding on that date. A SPAC’s float collapses at each redemption, so two of these percentages are percentages of two different companies and they do not add. Rows are one per SPAC: where a joint schedule names several reporting persons, the largest single figure is shown rather than their sum, because a manager and the funds it advises beneficially own the same shares. Nothing on this page is derived from a 13F, a vendor holdings file or a press release. See how this is built.