DFX Intelligence

Matthew John Downs

Managing Memberat Sandbox Industries· IL

As of 2026-09-23 · this person's identity; each section below carries its own date

Current roles: 6
Investments attributed: 1
Board seats: 1

Ask DFX about this View relationships Find contacts Investments Board seats

As of 2026-09-23 · this person's identity; each section below carries its own date

3 additional roles and seats

Every relationship, signal and contact on this record, with the source on each.

Includes 3 days of DFX Intelligence. Then $199/month unless canceled.

Nothing material in the last 365 days. Last change: 10 Apr 2024, Latest Lumeris Group Holdings round on 10 Apr 2024.

Relationship network

8 connected entities1 observed investment recordinvestment records 2024

From the roles sources name this person in, the investments a source attributes to them, and the boards and funds Form D names them on.

Some relationships on this record are counted rather than named here. They open with the full profile.

Click any name or line for the investment records and sources behind it. Line weight is investment records together; dashed lines are inferred.

Reading the network

Organization
Company
Fund or vehicle

›How strength and recency are read

Venture relationships are not scored. Each line names its claim: a round led or joined, a board seat or a filing that names the firm, a listing on a portfolio page (dated by when DFX saw it, never by when the investment was made), a disclosed LP commitment, or a co-investor pair counted from observed participations. Observed means a named source says so; Derived means DFX counted it from observed rows; Inferred means a match that may be wrong.

Darker lines were active in the last 24 months or are current; lighter lines are older or undated.

Ask DFX about this network

Which companies and boards is Matthew John Downs connected to?

How am I connected?

Name your firm, a company or a person, and DFX finds the published routes to Matthew John Downs: a shared portfolio company or board, a prior employer, a co-investor, a shared LP or service provider. Every step is a filed or published record with its source; none is a guess about who knows whom.

See how you connect to Matthew John Downs

Includes 3 days of DFX Intelligence. Then $199/month unless canceled.

Drawing the relationship network…

Roles

5 current, 1 past

Cultivian Sandbox Venture Management, LLC Managing Member
Aug 1, 2017 to present · “Schedule A: DOWNS, MATTHEW, JOHN, MANAGING MEMBER, since 08/2017, ownership D, control person Y”
Fact Form ADV
Sandbox Industries Managing Member
Aug 1, 2017 to present · “Schedule A: DOWNS, MATTHEW, JOHN, MANAGING MEMBER, since 08/2017, ownership D, control person Y”
Fact Form ADV
Sandbox Holdings, LLC Managing Member
Aug 1, 2017 to present · “Schedule A: DOWNS, MATTHEW, JOHN, MANAGING MEMBER, since 08/2017, ownership D, control person Y”
Fact Form ADV

Investments attributed to this person

Company	Round	Investor	Attribution	Date	Source
Lumeris Group Holdings Corp	board only	Cultivian Sandbox Venture Management, LLC	strongly supported · board	Apr 10, 2024	Inference sec.gov

Board seats and vehicles

1 board, 1 vehicle

Lumeris Group Holdings Corp Director Apr 10, 2024 Inference
Healthbox Nashville I LLC Executive Officer/Director/Promoter Oct 7, 2013

Timeline

6 dated entries: events, attributed deals, board seats and role changes

Apr 10, 2024
Board seat at Lumeris Group Holdings Corp (Cultivian Sandbox Venture Management, LLC)
Board seat Inference Lumeris Group Holdings Corp Form D
Mar 30, 2018
Matthew John Downs (Director) no longer on Schedule A of Healthbox Global Partners
Person left Inference Healthbox Global Partners Form ADV
Aug 1, 2017
Joined Cultivian Sandbox Venture Management, LLC as Managing Member
Role began Fact Cultivian Sandbox Venture Management, LLC Form ADV
Aug 1, 2017
Joined Sandbox Industries as Managing Member
Role began Fact Sandbox Industries Form ADV
Aug 1, 2017
Joined Sandbox Holdings, LLC as Managing Member
Role began Fact Sandbox Holdings, LLC Form ADV

Full timeline · 6 entriesnewest first

Apr 10, 2024
Board seat at Lumeris Group Holdings Corp (Cultivian Sandbox Venture Management, LLC)
Board seat Inference Lumeris Group Holdings Corp Form D
Mar 30, 2018
Matthew John Downs (Director) no longer on Schedule A of Healthbox Global Partners
Person left Inference Healthbox Global Partners Form ADV
Aug 1, 2017
Joined Cultivian Sandbox Venture Management, LLC as Managing Member
Role began Fact Cultivian Sandbox Venture Management, LLC Form ADV
Aug 1, 2017
Joined Sandbox Industries as Managing Member
Role began Fact Sandbox Industries Form ADV
Aug 1, 2017
Joined Sandbox Holdings, LLC as Managing Member
Role began Fact Sandbox Holdings, LLC Form ADV
Aug 1, 2008
Matthew John Downs joined Schedule A of Sandbox Investment Management, LLC as Member, Manager
Person joined Fact Sandbox Investment Management, LLC Form ADV

Record history

2 dated events on the change ledger, latest event first

Person left
2018-03-30source on record
Person joined
2008-08-01source on record

The ledger records every merge, rename and reclassification this record went through and the dated filings observed on it, so the identity on this page can be traced to the records it was built from. The ledger's own sentences name other records, so they show with the names.