Mark Christopherson is listed as an executive officer and director on 3 SEC Form D filings by 3 issuers between Sep 2013 and Jan 2026: NXTHERA INC (Maple Grove, MN — other health care — 2013; $25M reported sold to 31 investors), Lunair Medical, Inc. (Minneapolis, MN — other health care — 2025; $7.5M reported sold to 3 investors) and Bone Foam, Inc. (Corcoran, MN — other health care — 2026; $290K reported sold to 7 investors).
What this means A repeat sponsor — 3 separate companies raised money with this person listed as executive officer and director, over about 13 years. Across those companies the filings report $32.8M sold in total.
1 of the issuers belongs to the sponsor group Nxthera (2 issuers, $60.6M reported sold, 2009–2024).
What this means A sponsor group is one team that sets up a new company for each deal. Nxthera has 2 companies on file and $60.6M reported sold in total — the group page shows the whole track record in one place.
Public records searched: federal courts (CourtListener / RECAP), SEC enforcement releases, state securities regulators (AZ, CA, DE, TX, WA) — 6 bankruptcy cases matching the name listed in Key records below.
What this means 6 records came back. Each one is listed below with a link to the original document and a line saying why it matched. A name match is not proof it is the same person or company — read the why line and the document. Being sued or named in a release is an accusation, not a finding.
We compared 3 public filings for Mark Christopherson and found 4 differences: Form D filed 20 days after the first sale; Form D filed 40 days after the first sale; and more below.
What this means These are differences between the sponsor's own SEC filings — both values, dates and sources are listed in Key records, section 4. Most have ordinary explanations; ask the sponsor.