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 / MBX Capital

MBX Capital

Multi-stage venture firmTuxedo Park, NYSEC venture capital fund adviser

both early and growth/opportunity families, reported GAV $95M

Importance
25
moderate
Active deployment
29
moderate
Emerging
0
low
Completeness
38
elevated
Freshness
99
high
Research priority
15
moderate
Identity and regulatory footprint
Headquarters
Tuxedo Park, NYadviserinfo.sec.gov
Office address
12 RIDGE ROAD, Tuxedo Park, NY, 10987adviserinfo.sec.gov
Business phone
646-389-3388adviserinfo.sec.gov
Website
unknown
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 9, 2026
Private funds reported
45 (45 venture capital funds)adviserinfo.sec.gov
Private fund gross assets
$94.7Madviserinfo.sec.govreported GAV of the funds, the adviser's own number; not fund size, not dry powder
business phone
646-389-3388adviserinfo.sec.govpublished by the subject
Stated thesis versus observed behaviour
1 observed deals
Stated (the firm’s website)
Sectors
not stated or not yet read
Stages
not stated or not yet read
Geography
not stated
Check size
not stated; DFX does not estimate checks from round sizes
Observed (from deals on record)
Stage at participation: no observed deals yet
Stage at first entry: no observed deals yet
Sectors
Biotechnology 100%
lead rate n/afollow-on rate n/anew logos, 12 months 1
Funds and vehicles
45 reported
VehicleTypeVintageLifecycleReported GAVOwnersForm D soldLatest Form D
Capsule 18, a Series of Mbx Capital Opportunities I, LLCSPV or co-invest vehicle2025 form d first saleNewly closed$681,590
Sep 12, 2026
19$695,000
of $695,000
May 8, 2025
Capsule 17, a Series of Mbx Capital Opportunities I, LLCSPV or co-invest vehicle2025 form d first saleNewly closed$388,579
Sep 12, 2026
6$400,000
of $400,000
Feb 13, 2025
Capsule 19, a Series of Mbx Capital Opportunities I, LLCSPV or co-invest vehicle2025 form d first saleNewly closed$264,340
Sep 12, 2026
3$275,000
of $275,000
Aug 26, 2025
Capsule 12, a Series of Mbx Capital Opportunities I, LLCSPV or co-invest vehicle2024 form d first saleEarly deployment$1.2M
Sep 12, 2026
21$705,500
of $705,500
Mar 6, 2024
Capsule 16 a Series of Mbx Capital Opportunities I, LLCSPV or co-invest vehicle2024 form d first saleEarly deployment$313,185
Sep 12, 2026
6$300,600
of $300,600
Aug 21, 2024
Capsule 15 a Series of Mbx Capital Opportunities I, LLCSPV or co-invest vehicle2024 form d first saleEarly deployment$305,000
Sep 12, 2026
7$319,990
of $319,990
May 14, 2024
Capsule 14, a Series of Mbx Capital Opportunities I, LLCSPV or co-invest vehicle2024 form d first saleEarly deployment$208,890
Sep 12, 2026
3$220,000
of $220,000
Jul 5, 2024
MBX Capital III-A LPFeeder or parallel2023 form d first saleActive deployment$1.4M
Sep 12, 2026
12$1.4M
of $1.4M
Mar 11, 2025
Capsule 11, a Series of Mbx Capital Opportunities I, LLCSPV or co-invest vehicle2023 form d first saleActive deployment$113,290
Sep 12, 2026
3$122,000
of $122,000
Sep 8, 2023
Capsule 13, a Series of Mbx Capital Opportunities I, LLCSPV or co-invest vehicle2023 form d first saleActive deployment$96,015
Sep 12, 2026
3$105,000
of $105,000
Aug 31, 2023
Capsule 8, a Series of Mbx Capital Opportunities I, LLCSPV or co-invest vehicle2022 form d first saleActive deployment$4.0M
Sep 12, 2026
1$1.0M
of $1.0M
Feb 2, 2022
MBX Capital Ii-A ,LPFeeder or parallel2022 form d first saleActive deployment$4.0M
Sep 12, 2026
33$4.5M
of $4.5M
Mar 29, 2023
Capsule 7, a Series of Mbx Capital Opportunities I, LLCSPV or co-invest vehicle2022 form d first saleActive deployment$2.9M
Sep 12, 2026
74$2.9M
of $2.9M
Feb 2, 2022
Capsule 10, a Series of Mbx Capital Opportunities I, LLCSPV or co-invest vehicle2022 form d first saleActive deployment$618,130
Sep 12, 2026
11$618,130
of $618,130
Jun 3, 2022
Capsule 9, a Series of Mbx Capital Opportunities I, LLCSPV or co-invest vehicle2022 form d first saleActive deployment$0
Sep 12, 2026
31$1.2M
of $1.2M
Mar 23, 2022
Capsule 6, a Series of Mbx Capital Opportunities I, LLCSPV or co-invest vehicle2021 form d first saleMature$1.1M
Sep 12, 2026
21$1.1M
of $1.1M
Jan 10, 2022
MBX Capsule 2 a Series of Mbx Capital Opportunities 2021, LLCSPV or co-invest vehicle2021 form d first saleMature$217,765
Sep 12, 2026
7$225,000
of $225,000
May 20, 2021
MBX Capsule 4, a Series of Mbx Capital Opportunities 2021, LLCSPV or co-invest vehicle2021 form d first saleMature$124,050
Sep 12, 2026
5$130,000
of $130,000
Aug 17, 2021
MBX Capsule 3 a Series of Mbx Capital Opportunities 2021, LLCSPV or co-invest vehicle2021 form d first saleMature$64,714
Sep 12, 2026
5$98,000
of $98,000
May 11, 2021
Contraline Capsule, a Series of Fundrx Master Fund I, LLCSPV or co-invest vehicle2020 form d first saleMature$279,998
Sep 12, 2026
13$290,000
of $290,000
May 5, 2020
MBX Capsule 1, a Series of Mbx Capital Opportunities 2020, LLCSPV or co-invest vehicle2020 form d first saleMature$0
Sep 12, 2026
5$245,000
of $245,000
Dec 29, 2020
FRX Select I, LPGrowth fund2019 adv first reportedMature$13.5M
Sep 12, 2026
73$0
of $25.0M
Nov 8, 2018
Atlas Health Capsule, a Series of Fundrx Master Fund I, LLCSPV or co-invest vehicle2019 form d first saleMature$1.8M
Sep 12, 2026
8$155,000
of $155,000
Jul 24, 2019
Concert Health Capsule, a Series of Fundrx Master Fund I, LLCSPV or co-invest vehicle2019 form d first saleMature$187,789
Sep 12, 2026
8$59,000
of $59,000
Mar 27, 2019
Cloudcath Capsule, a Series of Fundrx Master Fund I, LLCSPV or co-invest vehicle2019 form d first saleMature$122,245
Sep 12, 2026
9$130,000
of $130,000
Dec 17, 2019
Neuromotion Capsule, a Series of Fundrx Master Fund I, LLCSPV or co-invest vehicle2019 form d first saleMature$54,188
Sep 12, 2026
4$95,000
of $95,000
May 15, 2019
Carerev Capsule, a Series of Fundrx Master Fund I, LLCSPV or co-invest vehicle2019 form d first saleMature$0
Sep 12, 2026
8$130,000
of $130,000
Jul 29, 2019
Fundrx Capsule 19, a Series of Fundrx Master Fund I, LLCSPV or co-invest vehicle2018 form d first saleHarvest$352,237
Sep 12, 2026
4$70,000
of $70,000
Apr 26, 2018
Fundrx Capsule 23, a Series of Fundrx Master Fund I, LLCSPV or co-invest vehicle2018 form d first saleHarvest$174,459
Sep 12, 2026
6$125,000
of $125,000
Aug 2, 2018
Fundrx Capsule 22, a Series of Fundrx Master Fund I, LLCSPV or co-invest vehicle2018 form d first saleHarvest$0
Sep 12, 2026
6$165,000
of $165,000
Mar 28, 2018
Fundrx Capsule 25, a Series of Fundrx Master Fund I, LLCSPV or co-invest vehicle2018 form d first saleHarvest$0
Sep 12, 2026
5$90,000
of $90,000
Jul 11, 2018
Fundrx Capsule 14, a Series of Fundrx Master Fund I, LLCSPV or co-invest vehicle2017 form d first saleHarvest$253,169
Sep 12, 2026
4$55,640
of $55,640
Jul 20, 2017
Fundrx Capsule 20, a Series of Fundrx Master Fund I, LLCSPV or co-invest vehicle2017 form d first saleHarvest$78,763
Sep 12, 2026
2$100,000
of $100,000
Dec 6, 2017
Capsule Fund 15, a Series of Fundrx Master Fund I, LLCSPV or co-invest vehicle2017 form d first saleHarvest$56,359
Sep 12, 2026
4$80,000
of $80,000
Nov 15, 2017
Fundrx Capsule 21, a Series of Fundrx Master Fund I, LLCSPV or co-invest vehicle2017 form d first saleHarvest$25,594
Sep 12, 2026
2$55,000
of $55,000
Dec 14, 2017
Fundrx Capsule 18, a Series of Fundrx Master Fund I, LLCSPV or co-invest vehicle2017 form d first saleHarvest$0
Sep 12, 2026
5$130,000
of $130,000
Nov 8, 2017
Capsule Fund 16, a Series of Fundrx Master Fund I, LLCSPV or co-invest vehicle2017 form d first saleHarvest$0
Sep 12, 2026
3$110,000
of $110,000
Aug 24, 2017
Fundrx Capsule 13, a Series of Fundrx Master Fund I, LLCSPV or co-invest vehicle2017 form d first saleHarvest$0
Sep 12, 2026
6$130,000
of $130,000
Aug 10, 2017
Fundrx Epibone Fund, a Series of Fundrx Master Fund I, LLCSPV or co-invest vehicle2016 form d first saleHarvest$0
Sep 12, 2026
5$70,000
of $70,000
Dec 1, 2016
FRX Sensulin LLCFund2016 form d first saleHarvest$0
Sep 12, 2026
6$40,000
of $40,000
Mar 15, 2017
Fundrx Soundbite Fund, a Series of Fundrx Master Fund I, LLCSPV or co-invest vehicle2016 form d first saleHarvest$0
Sep 12, 2026
5$85,000
of $85,000
Jul 22, 2016
MBX Capital III, LPFundunknownUnknown$29.3M
Sep 12, 2026
37$0
of $50.0M
Aug 9, 2023
MBX Capital II, LPFundunknownUnknown$24.6M
Sep 12, 2026
71$0
of $30.0M
Jan 11, 2021
MBX Capital NYS SSBCI Fund, LPFundunknownUnknown$5.8M
Sep 12, 2026
1$0
of $6.0M
Mar 13, 2025
Fundrx Capsule 31, a Series of Fund Rx Master Fund I, LLCSPV or co-invest vehicleunknownUnknown$100,389
Sep 12, 2026
2unknownunknown
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
0 current, 0 departed
No named professional yet. People arrive from Form ADV Schedule A (owners, officers, control persons) and the team page.
Investments on record
1 edges, 1 companies, 0 partner-attributed
CompanyRoundRolePartnerRound sizeThis investorDateSource
Contraline, Inc.portfolio listingunknownunknownunknownunknownSep 13, 2026Fact Portfolio company websites (about, investors, press pages)
“This investor” is the amount disclosed for this investor alone; it is unknown unless a source said it. The round size is the whole round.
Co-investors
6 relationships from shared deals, counted for the whole firm
RA Capital Management, LP 1 shared · one timeBVF Partners 1 shared · one time · they led 1Amboy Street Ventures, LLC 1 shared · one timeGoogle Ventures 1 shared · one timeGraphene Ventures LLC 1 shared · one timeBVF Partners L 1 shared · one time · they led 1
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
24 dated events
  1. Sep 12, 2026
    MBX Capital: INSTITUTIONAL_VC -> MULTI_STAGE_VC (both early and growth/opportunity families, reported GAV $95M)
    Classification changedClassificationInferenceno URL
  2. Sep 12, 2026
    MBX Capsule 4, a Series of Mbx Capital Opportunities 2021, LLC first reported on Form ADV by MBX Capital, GAV $124,050
    Fund first reported on Form ADVFundsFactMBX Capsule 4, a Series of Mbx Capital Opportunities 2021, LLCIAPD Form ADV Part 1 PDF per firm (current filing, Schedule D 7.B.(1) and Schedule A)
  3. Sep 12, 2026
    MBX Capsule 3 a Series of Mbx Capital Opportunities 2021, LLC first reported on Form ADV by MBX Capital, GAV $64,714
    Fund first reported on Form ADVFundsFactMBX Capsule 3 a Series of Mbx Capital Opportunities 2021, LLCIAPD Form ADV Part 1 PDF per firm (current filing, Schedule D 7.B.(1) and Schedule A)
  4. Sep 12, 2026
    MBX Capsule 2 a Series of Mbx Capital Opportunities 2021, LLC first reported on Form ADV by MBX Capital, GAV $217,765
    Fund first reported on Form ADVFundsFactMBX Capsule 2 a Series of Mbx Capital Opportunities 2021, LLCIAPD Form ADV Part 1 PDF per firm (current filing, Schedule D 7.B.(1) and Schedule A)
  5. Sep 12, 2026
    MBX Capsule 1, a Series of Mbx Capital Opportunities 2020, LLC first reported on Form ADV by MBX Capital
    Fund first reported on Form ADVFundsFactMBX Capsule 1, a Series of Mbx Capital Opportunities 2020, LLCIAPD Form ADV Part 1 PDF per firm (current filing, Schedule D 7.B.(1) and Schedule A)
  6. Sep 12, 2026
    MBX Capital III, LP first reported on Form ADV by MBX Capital, GAV $29,250,981
    Fund first reported on Form ADVFundsFactMBX Capital III, LPIAPD Form ADV Part 1 PDF per firm (current filing, Schedule D 7.B.(1) and Schedule A)
  7. Sep 12, 2026
    MBX Capital Ii-A ,LP first reported on Form ADV by MBX Capital, GAV $3,963,448
    Fund first reported on Form ADVFundsFactMBX Capital Ii-A ,LPIAPD Form ADV Part 1 PDF per firm (current filing, Schedule D 7.B.(1) and Schedule A)
  8. Sep 12, 2026
    MBX Capital II, LP first reported on Form ADV by MBX Capital, GAV $24,615,197
    Fund first reported on Form ADVFundsFactMBX Capital II, LPIAPD Form ADV Part 1 PDF per firm (current filing, Schedule D 7.B.(1) and Schedule A)
  9. Sep 12, 2026
    Contraline Capsule, a Series of Fundrx Master Fund I, LLC first reported on Form ADV by MBX Capital, GAV $279,998
    Fund first reported on Form ADVFundsFactContraline Capsule, a Series of Fundrx Master Fund I, LLCIAPD Form ADV Part 1 PDF per firm (current filing, Schedule D 7.B.(1) and Schedule A)
  10. Sep 12, 2026
    Capsule 9, a Series of Mbx Capital Opportunities I, LLC first reported on Form ADV by MBX Capital
    Fund first reported on Form ADVFundsFactCapsule 9, a Series of Mbx Capital Opportunities I, LLCIAPD Form ADV Part 1 PDF per firm (current filing, Schedule D 7.B.(1) and Schedule A)
  11. Sep 12, 2026
    Capsule 8, a Series of Mbx Capital Opportunities I, LLC first reported on Form ADV by MBX Capital, GAV $3,964,449
    Fund first reported on Form ADVFundsFactCapsule 8, a Series of Mbx Capital Opportunities I, LLCIAPD Form ADV Part 1 PDF per firm (current filing, Schedule D 7.B.(1) and Schedule A)
  12. Sep 12, 2026
    Capsule 7, a Series of Mbx Capital Opportunities I, LLC first reported on Form ADV by MBX Capital, GAV $2,913,522
    Fund first reported on Form ADVFundsFactCapsule 7, a Series of Mbx Capital Opportunities I, LLCIAPD Form ADV Part 1 PDF per firm (current filing, Schedule D 7.B.(1) and Schedule A)
  13. Sep 12, 2026
    Capsule 6, a Series of Mbx Capital Opportunities I, LLC first reported on Form ADV by MBX Capital, GAV $1,129,993
    Fund first reported on Form ADVFundsFactCapsule 6, a Series of Mbx Capital Opportunities I, LLCIAPD Form ADV Part 1 PDF per firm (current filing, Schedule D 7.B.(1) and Schedule A)
  14. Sep 12, 2026
    Capsule 19, a Series of Mbx Capital Opportunities I, LLC first reported on Form ADV by MBX Capital, GAV $264,340
    Fund first reported on Form ADVFundsFactCapsule 19, a Series of Mbx Capital Opportunities I, LLCIAPD Form ADV Part 1 PDF per firm (current filing, Schedule D 7.B.(1) and Schedule A)
  15. Sep 12, 2026
    Capsule 18, a Series of Mbx Capital Opportunities I, LLC first reported on Form ADV by MBX Capital, GAV $681,590
    Fund first reported on Form ADVFundsFactCapsule 18, a Series of Mbx Capital Opportunities I, LLCIAPD Form ADV Part 1 PDF per firm (current filing, Schedule D 7.B.(1) and Schedule A)
  16. Sep 12, 2026
    Capsule 17, a Series of Mbx Capital Opportunities I, LLC first reported on Form ADV by MBX Capital, GAV $388,579
    Fund first reported on Form ADVFundsFactCapsule 17, a Series of Mbx Capital Opportunities I, LLCIAPD Form ADV Part 1 PDF per firm (current filing, Schedule D 7.B.(1) and Schedule A)
  17. Sep 12, 2026
    Capsule 16 a Series of Mbx Capital Opportunities I, LLC first reported on Form ADV by MBX Capital, GAV $313,185
    Fund first reported on Form ADVFundsFactCapsule 16 a Series of Mbx Capital Opportunities I, LLCIAPD Form ADV Part 1 PDF per firm (current filing, Schedule D 7.B.(1) and Schedule A)
  18. Sep 12, 2026
    Capsule 15 a Series of Mbx Capital Opportunities I, LLC first reported on Form ADV by MBX Capital, GAV $305,000
    Fund first reported on Form ADVFundsFactCapsule 15 a Series of Mbx Capital Opportunities I, LLCIAPD Form ADV Part 1 PDF per firm (current filing, Schedule D 7.B.(1) and Schedule A)
  19. Sep 12, 2026
    Capsule 14, a Series of Mbx Capital Opportunities I, LLC first reported on Form ADV by MBX Capital, GAV $208,890
    Fund first reported on Form ADVFundsFactCapsule 14, a Series of Mbx Capital Opportunities I, LLCIAPD Form ADV Part 1 PDF per firm (current filing, Schedule D 7.B.(1) and Schedule A)
  20. Sep 12, 2026
    Capsule 13, a Series of Mbx Capital Opportunities I, LLC first reported on Form ADV by MBX Capital, GAV $96,015
    Fund first reported on Form ADVFundsFactCapsule 13, a Series of Mbx Capital Opportunities I, LLCIAPD Form ADV Part 1 PDF per firm (current filing, Schedule D 7.B.(1) and Schedule A)
  21. Sep 12, 2026
    Capsule 12, a Series of Mbx Capital Opportunities I, LLC first reported on Form ADV by MBX Capital, GAV $1,155,837
    Fund first reported on Form ADVFundsFactCapsule 12, a Series of Mbx Capital Opportunities I, LLCIAPD Form ADV Part 1 PDF per firm (current filing, Schedule D 7.B.(1) and Schedule A)
  22. Sep 12, 2026
    Capsule 11, a Series of Mbx Capital Opportunities I, LLC first reported on Form ADV by MBX Capital, GAV $113,290
    Fund first reported on Form ADVFundsFactCapsule 11, a Series of Mbx Capital Opportunities I, LLCIAPD Form ADV Part 1 PDF per firm (current filing, Schedule D 7.B.(1) and Schedule A)
  23. Sep 12, 2026
    Capsule 10, a Series of Mbx Capital Opportunities I, LLC first reported on Form ADV by MBX Capital, GAV $618,130
    Fund first reported on Form ADVFundsFactCapsule 10, a Series of Mbx Capital Opportunities I, LLCIAPD Form ADV Part 1 PDF per firm (current filing, Schedule D 7.B.(1) and Schedule A)
  24. Mar 14, 2025
    MBX Capital appears on the SEC adviser roster (ERA, venture capital fund adviser exemption)
    First SEC adviser filingOrganizationFactSEC Form ADV monthly roster (registered + exempt reporting advisers)
Classification history
  1. Sep 13, 2026
    Multi-stage venture firm (confirmed, 95%, cls-1)
    both early and growth/opportunity families, reported GAV $95M
  2. Sep 12, 2026
    Institutional venture firm (confirmed, 70%, cls-1)
    venture manager with no reported fund assets yet (scale unknown)
Evidence
14 observations from 2 sources
Every observation behind this profile, with its source, date and class
FactValueEffectiveClassSource
Why admittedvc_exemption,vc_funds_reportedMar 9, 2026FactSEC Form ADV monthly roster (registered + exempt reporting advisers)
SEC exemption claimedventure_capital_fund_adviserMar 9, 2026FactSEC Form ADV monthly roster (registered + exempt reporting advisers)
SEC adviser typeexempt_reporting_adviserMar 9, 2026FactSEC Form ADV monthly roster (registered + exempt reporting advisers)
Latest Form ADV filing2026-03-09Mar 9, 2026FactSEC Form ADV monthly roster (registered + exempt reporting advisers)
Adv pdf loadedadv-pdf-1Sep 12, 2026FactIAPD Form ADV Part 1 PDF per firm (current filing, Schedule D 7.B.(1) and Schedule A)
SEC statusERA - ActiveMar 9, 2026FactSEC Form ADV monthly roster (registered + exempt reporting advisers)
SEC status effective2025-03-14Mar 9, 2026FactSEC Form ADV monthly roster (registered + exempt reporting advisers)
Business phone646-389-3388Mar 9, 2026FactSEC Form ADV monthly roster (registered + exempt reporting advisers)
HeadquartersTuxedo Park, NYMar 9, 2026FactSEC Form ADV monthly roster (registered + exempt reporting advisers)
Office address12 RIDGE ROAD, Tuxedo Park, NY, 10987Mar 9, 2026FactSEC Form ADV monthly roster (registered + exempt reporting advisers)
Legal formLimited Liability CompanyMar 9, 2026FactSEC Form ADV monthly roster (registered + exempt reporting advisers)
Private funds reported45Mar 9, 2026FactSEC Form ADV monthly roster (registered + exempt reporting advisers)
Private fund gross assets (reported)$94.7MMar 9, 2026FactSEC Form ADV monthly roster (registered + exempt reporting advisers)
Venture funds reported45Mar 9, 2026FactSEC Form ADV monthly roster (registered + exempt reporting advisers)