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.

Firms / Underscore.vc Management Company, LLC

Underscore.vc Management Company, LLC

Seed fund managerBoston, MAunderscore.vcSEC venture capital fund adviser

Underscore VC is a Boston-based venture capital firm backing bold early-stage B2B software founders at Pre-Seed and Seed.

name or self-description says seed

Importance
36
elevated
Active deployment
25
moderate
Emerging
0
low
Completeness
69
high
Freshness
100
high
Research priority
12
low
Identity and regulatory footprint
Headquarters
Boston, MAadviserinfo.sec.gov
Office address
125 HIGH STREET, MUSEUM BUILDING/TOWER, 3RD FLOOR, SUITE 300, Boston, MA, 02110adviserinfo.sec.gov
Business phone
617-303-0064adviserinfo.sec.gov
SEC adviser type
exempt reporting adviseradviserinfo.sec.gov
SEC exemption claimed
venture capital fund adviseradviserinfo.sec.govItem 2.B(1): advises solely venture capital funds
Latest Form ADV
Mar 25, 2026
Private funds reported
9 (9 venture capital funds)adviserinfo.sec.gov
Private fund gross assets
$451Madviserinfo.sec.govreported GAV of the funds, the adviser's own number; not fund size, not dry powder
business email
hello@underscore.vcunderscore.vcpublished by the subject
business phone
617-303-0064adviserinfo.sec.govpublished by the subject
Stated thesis versus observed behaviour
no observed deals yet
Stated (the firm’s website)
Sectors
ai, enterprise software, fintech, healthcare, biotech, climate, hardware, robotics, space, defense, devtools, cybersecurity
Stages
pre seed, seed, series b, early
Geography
boston, global, globally
Check size
not stated; DFX does not estimate checks from round sizes
Self-described
seed
Observed (from deals on record)
Stage at participation: no observed deals yet
Stage at first entry: no observed deals yet
Sectors: no observed deals yet
lead rate n/afollow-on rate n/anew logos, 12 months 0
Funds and vehicles
9 reported
VehicleTypeVintageLifecycleReported GAVOwnersForm D soldLatest Form D
Underscore.vc Fund III, L.PFund2023 form d first saleActive deployment$1.6M
Mar 28, 2024
0$58.2M
of $58.2M
Apr 12, 2024
Underscore.vc Core Fund II Extension, LLCContinuation vehicle2023 adv first reportedActive deployment$238,525
Mar 28, 2024
5unknownunknown
Underscore.vc Fund II Extension , LPContinuation vehicle2022 form d first saleActive deployment$12.5M
Mar 28, 2024
25$18.0M
of $18.0M
Mar 18, 2022
Underscore.vc Core Fund II, LLCFund2019 adv first reportedMature$4.3M
Mar 28, 2024
72unknownunknown
Underscore.vc Fund II, LPFund2018 form d first saleHarvest$180M
Mar 28, 2024
33$132M
of $140M
Dec 20, 2018
Underscore.vc Core Fund, LLCFund2018 adv first reportedHarvest$3.0M
Mar 28, 2024
45unknownunknown
Underscore.vc Salsify Spv, L.P.SPV or co-invest vehicle2017 adv first reportedHarvest$19.1M
Mar 28, 2024
3unknownunknown
Assemble.vc Fund I , LPFundunknownUnknown$125M
Mar 28, 2024
28$0
of $75.0M
Jan 22, 2016
Blue Tulip Ventures I LPFundunknownFundraisingunknownunknown$0Jun 12, 2025
GAV is the gross asset value the adviser reported on Form ADV for the vehicle, never the fund’s committed size and never dry powder. Form D sold is the amount sold as of the latest filing, never a final close.
Investment team
24 current, 0 departed
Rana El Kaliouby
Smarty Eye Deputy CEO & Co-Founder of Affectiva
Founder or executive
Claire Crowther
Vice President, Strategy & Operations
Platform and operations
Jenna Birch
VP of Narrative & Communications, NFX
Platform and operations
Katheryn Thayer
Director of Brand & Marketing, Primary Ventures
Platform and operations
Kerry Bennett
Marketing Partner, Upfront Ventures
Platform and operations
Marco Rosario
Operations Manager & Executive Assistant
Platform and operations
Investments on record
0 edges, 0 companies, 0 partner-attributed
No investment on record yet. Edges arrive from the firm’s portfolio page, financing announcements, and Form D board seats.
Co-investors
0 relationships from shared deals, counted for the whole firm
No co-investor relationship yet: these are derived only from rounds and portfolio listings the graph has seen both investors on.
Limited partners
0 disclosed
No LP commitment on record. An LP edge needs a public disclosure with a quote: a pension report (see Limited partners for the plans read), a fund announcement naming the LP, or a Form ADV owner. The fund page carries the LP’s reported performance.
Timeline
11 dated events
  1. Sep 15, 2026
    Underscore.vc Management Company, LLC: INSTITUTIONAL_VC -> SEED_FUND_MANAGER (name or self-description says seed)
    Classification changedClassificationInferenceno URL
  2. Mar 28, 2024
    Underscore.vc Fund III, L.P first reported on Form ADV by Underscore.vc Management Company, LLC (Venture Capital Fund), GAV $1,568,464
  3. Apr 3, 2023
    Underscore.vc Core Fund II Extension, LLC first reported on Form ADV by Underscore.vc Management Company, LLC (Venture Capital Fund), GAV $188,462
  4. Mar 31, 2022
    Underscore.vc Fund II Extension , LP first reported on Form ADV by Underscore.vc Management Company, LLC (Venture Capital Fund), GAV $18,035,677
  5. Mar 13, 2019
    Underscore.vc Fund II, LP first reported on Form ADV by Underscore.vc Management Company, LLC (Venture Capital Fund), GAV $128,226,717
  6. Mar 13, 2019
    Underscore.vc Core Fund II, LLC first reported on Form ADV by Underscore.vc Management Company, LLC (Venture Capital Fund)
  7. Aug 1, 2018
    James S Orsillo Jr joined Schedule A of Underscore.vc Management Company, LLC as Chief Financial Officer
  8. Mar 30, 2018
    Underscore.vc Core Fund, LLC first reported on Form ADV by Assemble.vc Management Company, LLC (Venture Capital Fund), GAV $751,036
  9. Mar 22, 2017
    Underscore.vc Salsify Spv, L.P. first reported on Form ADV by Assemble.vc Management Company, LLC (Venture Capital Fund), GAV $3,547,461
  10. Mar 25, 2016
    Assemble.vc Management Company, LLC first filed Form ADV (ERA, venture capital fund adviser exemption)
  11. Mar 25, 2016
    Assemble.vc Fund I , LP first reported on Form ADV by Assemble.vc Management Company, LLC (Venture Capital Fund), GAV $32,100,000
Classification history
  1. Sep 15, 2026
    Seed fund manager (confirmed, 95%, cls-1)
    name or self-description says seed
  2. Sep 12, 2026
    Institutional venture firm (confirmed, 95%, cls-1)
    venture manager, reported GAV $345M across 8 vehicles
Evidence
53 observations from 3 sources
Every observation behind this profile, with its source, date and class
FactValueEffectiveClassSource
Why admittedvc_exemption,vc_funds_reportedMar 25, 2026FactSEC Form ADV monthly roster (registered + exempt reporting advisers)
SEC exemption claimedventure_capital_fund_adviserMar 25, 2026FactSEC Form ADV monthly roster (registered + exempt reporting advisers)
SEC exemption claimedventure_capital_fund_adviserMar 28, 2024FactSEC Form ADV filing data 2011 to 2024 (every filing, Schedule D 7.B.(1) private funds, Schedules A/B)
SEC adviser typeexempt_reporting_adviserMar 25, 2026FactSEC Form ADV monthly roster (registered + exempt reporting advisers)
SEC adviser typeexempt_reporting_adviserMar 28, 2024FactSEC Form ADV filing data 2011 to 2024 (every filing, Schedule D 7.B.(1) private funds, Schedules A/B)
First Form ADV filing2016-03-25Mar 28, 2024FactSEC Form ADV filing data 2011 to 2024 (every filing, Schedule D 7.B.(1) private funds, Schedules A/B)
Adv history loadedadv-hist-1Sep 12, 2026FactSEC Form ADV filing data 2011 to 2024 (every filing, Schedule D 7.B.(1) private funds, Schedules A/B)
Latest Form ADV filing2026-03-25Mar 25, 2026FactSEC Form ADV monthly roster (registered + exempt reporting advisers)
Latest Form ADV filing2024-03-28Mar 28, 2024FactSEC Form ADV filing data 2011 to 2024 (every filing, Schedule D 7.B.(1) private funds, Schedules A/B)
SEC statusERA - ActiveMar 25, 2026FactSEC Form ADV monthly roster (registered + exempt reporting advisers)
SEC status effective2016-03-25Mar 25, 2026FactSEC Form ADV monthly roster (registered + exempt reporting advisers)
Venture share of reported funds1Mar 28, 2024FactSEC Form ADV filing data 2011 to 2024 (every filing, Schedule D 7.B.(1) private funds, Schedules A/B)
Business phone617-303-0064Mar 25, 2026FactSEC Form ADV monthly roster (registered + exempt reporting advisers)
Business phone617-303-0064Mar 28, 2024FactSEC Form ADV filing data 2011 to 2024 (every filing, Schedule D 7.B.(1) private funds, Schedules A/B)
DescriptionUnderscore VC is a Boston-based venture capital firm backing bold early-stage B2B software founders at Pre-Seed and Seed.
meta description
Sep 16, 2026FactVenture organization websites (about, team, portfolio, thesis, news pages)
DescriptionUnderscore VC is a Boston-based venture capital firm backing bold early-stage B2B software founders at Pre-Seed and Seed.
meta description
Sep 15, 2026FactVenture organization websites (about, team, portfolio, thesis, news pages)
HeadquartersBoston, MAMar 25, 2026FactSEC Form ADV monthly roster (registered + exempt reporting advisers)
HeadquartersBoston, MAMar 28, 2024FactSEC Form ADV filing data 2011 to 2024 (every filing, Schedule D 7.B.(1) private funds, Schedules A/B)
Office address125 HIGH STREET, MUSEUM BUILDING/TOWER, 3RD FLOOR, SUITE 300, Boston, MA, 02110Mar 25, 2026FactSEC Form ADV monthly roster (registered + exempt reporting advisers)
Office addressOLD CITY HALL, 45 SCHOOL STREET FLOOR 2, Boston, MA, 02108Mar 28, 2024FactSEC Form ADV filing data 2011 to 2024 (every filing, Schedule D 7.B.(1) private funds, Schedules A/B)
Self-described typeseed
Underscore VC is a Boston-based venture capital firm backing bold B2B software entrepreneurs at Pre-Seed and Seed.
Sep 16, 2026FactVenture organization websites (about, team, portfolio, thesis, news pages)
Self-described typeseed
Underscore VC is a Boston-based venture capital firm backing bold B2B software entrepreneurs at Pre-Seed and Seed.
Sep 15, 2026FactVenture organization websites (about, team, portfolio, thesis, news pages)
Legal formLimited Liability CompanyMar 25, 2026FactSEC Form ADV monthly roster (registered + exempt reporting advisers)
Legal formLimited Liability CompanyMar 28, 2024FactSEC Form ADV filing data 2011 to 2024 (every filing, Schedule D 7.B.(1) private funds, Schedules A/B)
Portfolio pagehttps://underscore.vc/portfolio/
0 entries read
Sep 16, 2026FactVenture organization websites (about, team, portfolio, thesis, news pages)
Portfolio pagehttps://underscore.vc/portfolio/
0 entries read
Sep 15, 2026FactVenture organization websites (about, team, portfolio, thesis, news pages)
Private funds reported9Mar 25, 2026FactSEC Form ADV monthly roster (registered + exempt reporting advisers)
Private funds reported8Mar 28, 2024FactSEC Form ADV filing data 2011 to 2024 (every filing, Schedule D 7.B.(1) private funds, Schedules A/B)
Private fund gross assets (reported)$451MMar 25, 2026FactSEC Form ADV monthly roster (registered + exempt reporting advisers)
Private fund gross assets (reported)$345MMar 28, 2024FactSEC Form ADV filing data 2011 to 2024 (every filing, Schedule D 7.B.(1) private funds, Schedules A/B)
Stated geographyboston,global,globally
geography words on the home page
Sep 16, 2026FactVenture organization websites (about, team, portfolio, thesis, news pages)
Stated geographyboston,global,globally
geography words on the home page
Sep 15, 2026FactVenture organization websites (about, team, portfolio, thesis, news pages)
Stated sectorsai,enterprise_software,fintech,healthcare,biotech,climate,hardware,robotics,space,defense,devtools,cybersecurity
sector words on the home page
Sep 16, 2026FactVenture organization websites (about, team, portfolio, thesis, news pages)
Stated sectorsai,enterprise_software,fintech,healthcare,biotech,climate,hardware,robotics,space,defense,devtools,cybersecurity
sector words on the home page
Sep 15, 2026FactVenture organization websites (about, team, portfolio, thesis, news pages)
Stated stagespre_seed,seed,series_b,early
stage words on the home page
Sep 16, 2026FactVenture organization websites (about, team, portfolio, thesis, news pages)
Stated stagespre_seed,seed,series_b,early
stage words on the home page
Sep 15, 2026FactVenture organization websites (about, team, portfolio, thesis, news pages)
Team pagehttps://underscore.vc/team/
21 name/title pairs read
Sep 16, 2026FactVenture organization websites (about, team, portfolio, thesis, news pages)
Team pagehttps://underscore.vc/team/
21 name/title pairs read
Sep 15, 2026FactVenture organization websites (about, team, portfolio, thesis, news pages)
Venture funds reported9Mar 25, 2026FactSEC Form ADV monthly roster (registered + exempt reporting advisers)
Venture funds reported8Mar 28, 2024FactSEC Form ADV filing data 2011 to 2024 (every filing, Schedule D 7.B.(1) private funds, Schedules A/B)
WebsiteHTTPS://UNDERSCORE.VC/Mar 28, 2024FactSEC Form ADV filing data 2011 to 2024 (every filing, Schedule D 7.B.(1) private funds, Schedules A/B)
Site titleHome | Underscore VC
title tag
Sep 16, 2026FactVenture organization websites (about, team, portfolio, thesis, news pages)
Site titleHome | Underscore VC
title tag
Sep 15, 2026FactVenture organization websites (about, team, portfolio, thesis, news pages)