Firms, funds, partners, companies and rounds from sworn filings, firm sites and announcements, kept as a graph with a date and a source on every edge. Facts, inferences and estimates are labelled as such. A fund target is never a close, GAV is never dry powder, and a round size is never an investor’s check.

Funds / Mainspring Funding LLC

Mainspring Funding LLC

Newly closedClosed to new capitalFundADV: Venture Capital Fundmanager not yet resolvedDelaware
Amounts, each with its basis
Vintage
2026basis: form d first sale
Target
unknownnot announced
First close
unknownnever inferred from a Form D
Final close
unknownonly from an announcement or an LP disclosure
Announced size
unknown
Form D offering
$711,974what may be sold, not what was raised; file 021-588181, 021-475603, sworn by the adviser or filed under this vehicle
Form D sold
$711,974as of the filing of Jun 23, 2026, 34 investors
First sale
Jun 8, 2026
Reported GAV
unknown
Owners (ADV)
unknown
Reported on ADV
unknown
Fundraising evidence
Closed to new capital
Form D filed or amended 2026-06-23: the stated $711,974 offering reported fully sold (fr-1)
evidence dated Jun 23, 2026. A Form D offering is permission to sell, not a fund in market; an amount sold is never a close; an evergreen offering amended every year is not a raise.
Lifecycle
Newly closed
first sale within 24 months; Form D sold out or quiet
first sale: 2026-06-08vintage year: $2,026adv gav as of: n/avintage basis: form_d_first_saleform d sold usd: $711,974form d offering usd: $711,974form d latest filed at: 2026-06-23
The fund's own reporting through time
0 Form ADV filings
No Form ADV reporting row: this vehicle is known from Form D only.
Principals and agents
2 principals on Form D, 0 placement agents
  • Alexander Weiss Executive Officer/Director
  • Mainspring Funding Manager LLC Executive Officer/Director/Promoter
Limited partners and their reported performance
0 public LP reports
No public LP has reported this vehicle. The LP tape is read from public pension disclosures (see Limited partners); a fund appears here only when an LP’s report names it.
Investments attributed to this vehicle
0
No investment attributed to this vehicle. The firm’s investments sit on the firm; a fund gets one only when a source names the vehicle.
Timeline
2 events
  1. Jun 23, 2026
    Mainspring Funding LLC filed Form D: $711,974 sold of $711,974, Venture Capital Fund
    Form D filed Fact SEC EDGAR Form D data sets (quarterly)
  2. Mar 13, 2023
    Mainspring Funding LLC filed Form D: $6,830,000 sold of $10,000,000, Venture Capital Fund
    Form D filed Fact SEC EDGAR Form D data sets (quarterly)
Evidence
32 observations
Every observation on this vehicle