Mainspring Funding Manager LLC vs Jeff Seibert compared for founders deciding who to pitch. Stage focus, check size, and sector fit compared side by side.
Mainspring Funding Manager LLC is a individual/angel based in West Palm Beach. Jeff Seibert is a individual/angel based in San Francisco, California, United States across 54 portfolio companies.
Investors like Mainspring Funding Manager LLC · Investors like Jeff Seibert · Mainspring Funding Manager LLC co-investors · Full investor directory