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 / 503 Partners, LLC

503 Partners, LLC

Institutional venture firmPortland, OR3x5fund.comSEC venture capital fund adviserone firm, 2 filing advisers

This firm files as 2 advisers on 3x5fund.com: American Century Investment Management Inc. Each keeps its own CRD, funds and filings; the grouping is the website each swore to on Form ADV and is recomputed every pass.

Private investments offer qualified investors the ability to invest in companies and instruments that aren

venture manager, reported GAV $72M across 9 vehicles

Importance
20
moderate
Active deployment
0
low
Emerging
0
low
Completeness
56
elevated
Freshness
100
high
Research priority
4
low
Identity and regulatory footprint
Headquarters
Portland, ORadviserinfo.sec.gov
Office address
2540 NE MARTIN LUTHER KING JR. BOULEVARD, Portland, OR, 97212adviserinfo.sec.gov
Business phone
541-490-5155adviserinfo.sec.gov
Website
HTTP://WWW.3X5FUND.COM
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 13, 2026
Private funds reported
5 (5 venture capital funds)adviserinfo.sec.gov
Private fund gross assets
$28.7Madviserinfo.sec.govreported GAV of the funds, the adviser's own number; not fund size, not dry powder
Owners on Schedule A
Joseph R Biller Trust (Member), C; Christine a Arnerich Trust (Member), B; Anthony L Arnerich Trust (Member), B; Kristin R & Nicholas T Walrod Trust (Member), C
business email
emea-team@americancentury.comamericancentury.compublished by the subject
business email
n1-asia_pacific_business@americancentury.comamericancentury.compublished by the subject
business email
australia@americancentury.comamericancentury.compublished by the subject
business email
institutional@americancentury.comamericancentury.compublished by the subject
business phone
5038087900adviserinfo.sec.govpublished by the subject
business phone
541-490-5155adviserinfo.sec.govpublished by the subject
Stated thesis versus observed behaviour
no observed deals yet
Stated (the firm’s website)
Sectors
healthcare, biotech, medtech, climate, energy, logistics, agtech
Stages
growth, early
Geography
asia, australia, germany, global, uk, united states
Check size
not stated; DFX does not estimate checks from round sizes
Self-described
venture capital
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, 4 no longer reported
VehicleTypeVintageLifecycleReported GAVOwnersForm D soldLatest Form D
3x5 Wws Investors, LLCFund2022 form d first saleActive deployment$6.0M
Mar 5, 2024
3$1.0MJan 17, 2023
3x5 Kaleidoscope Investors, LLCFund2022 form d first saleActive deployment$5.5M
Mar 5, 2024
25$5.5M
of $5.5M
Feb 17, 2022
3x5 Aaf Holdings, LLCFund2021 adv first reportedMature$4.3M
Mar 5, 2024
1unknownunknown
Smart Wires Investors, LLCFund2020 adv first reportedMature$4.7M
Mar 5, 2024
95$0Jun 16, 2015
Artms Investors, LLCFund2019 form d first saleMature$8.2M
Mar 5, 2024
22$1.5MMar 17, 2020
Smart Wires Investors II, LLCFund2018 form d first saleHarvest$5.2M
Mar 5, 2024
45$300,000Sep 28, 2018
Zero Mass Water Investors, LLCFund2015 form d first saleHarvest$36.4M
Mar 5, 2024
84$2.6MJun 17, 2015
Rubicon Global Investors, LLCFund2014 form d first saleHarvest$1.6M
Mar 5, 2024
52$10.1MFeb 24, 2015
Vapotherm Investors, LLCFund2012 form d first saleHarvest$89,949
Mar 5, 2024
94$3.0MNov 15, 2012
Arch Oncology Investors, LLCFund2022 adv first reportedWound down$130,954
Oct 10, 2023
42unknownunknown
Fishpeople Investors, LLCFund2020 adv first reportedWound down$2.5M
Mar 30, 2022
73unknownunknown
Keemotion Investors, LLCFund2020 adv first reportedWound down$300,000
Mar 29, 2021
6unknownunknown
Smart Wires Credit Facility, LLCFund2020 adv first reportedWound down$12,316
Oct 10, 2023
11unknownunknown
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
7 current, 1 departed
Anthony Louis Arnerich
Trustee Anthony L Arnerich Trust · since Jan 1, 2016
Board or advisory
FactSEC Form ADV filing data 2011 to 2024 (every filing, Schedule D 7.B.(1) private funds, Schedules A/B)
Christine Anne Arnerich
Trustee Christine A Arnerich Trust · since Jan 1, 2016
Board or advisory
FactSEC Form ADV filing data 2011 to 2024 (every filing, Schedule D 7.B.(1) private funds, Schedules A/B)
Joseph Richard Biller
Trustee Joseph R Biller Trust · since Dec 1, 2021
Board or advisory
FactSEC Form ADV filing data 2011 to 2024 (every filing, Schedule D 7.B.(1) private funds, Schedules A/B)
Kristin Rene Walrod
Trustee Kristin R And Nicholas T Walrod Trust · since Jan 1, 2016
Board or advisory
FactSEC Form ADV filing data 2011 to 2024 (every filing, Schedule D 7.B.(1) private funds, Schedules A/B)
Nicholas Thatcher Walrod
Trustee Kristin R And Nicholas T Walrod Trust · since Jan 1, 2016
Board or advisory
FactSEC Form ADV filing data 2011 to 2024 (every filing, Schedule D 7.B.(1) private funds, Schedules A/B)
Fixed Income
More Perspectives & Research
Other
FactVenture organization websites (about, team, portfolio, thesis, news pages)
Key Topics
More Perspectives & Research
Other
FactVenture organization websites (about, team, portfolio, thesis, news pages)
1 departed (kept with end dates)
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
24 dated events
  1. Sep 16, 2026
    Sustainable Investing (More Perspectives & Research) no longer on the team page of 503 Partners, LLC
    Person leftPeopleInferenceSustainable InvestingVenture organization websites (about, team, portfolio, thesis, news pages)
  2. Mar 5, 2024
    Arch Oncology Investors, LLC no longer reported on Form ADV by 503 Partners, LLC
    Fund no longer reportedFundsInferenceArch Oncology Investors, LLCSEC Form ADV filing data 2011 to 2024 (every filing, Schedule D 7.B.(1) private funds, Schedules A/B)
  3. Mar 5, 2024
    Smart Wires Credit Facility, LLC no longer reported on Form ADV by 503 Partners, LLC
    Fund no longer reportedFundsInferenceSmart Wires Credit Facility, LLCSEC Form ADV filing data 2011 to 2024 (every filing, Schedule D 7.B.(1) private funds, Schedules A/B)
  4. Oct 10, 2023
    3x5 Partners Fund III, LP no longer reported on Form ADV by 3x5 Partners
    Fund no longer reportedFundsInferenceAmerican Century Venture Fund I, LPSEC Form ADV filing data 2011 to 2024 (every filing, Schedule D 7.B.(1) private funds, Schedules A/B)
  5. Oct 10, 2023
    3x5 Partners Fund Iii-B, L.P. no longer reported on Form ADV by 3x5 Partners
    Fund no longer reportedFundsInferenceAmerican Century Venture Fund I-B, LPSEC Form ADV filing data 2011 to 2024 (every filing, Schedule D 7.B.(1) private funds, Schedules A/B)
  6. Mar 7, 2023
    3x5 Kaleidoscope Investors, LLC first reported on Form ADV by 3x5 Partners (Venture Capital Fund), GAV $5,500,000
    Fund first reported on Form ADVFundsFact3x5 Kaleidoscope Investors, LLCSEC Form ADV filing data 2011 to 2024 (every filing, Schedule D 7.B.(1) private funds, Schedules A/B)
  7. Mar 7, 2023
    Fishpeople Investors, LLC no longer reported on Form ADV by 3x5 Partners
    Fund no longer reportedFundsInferenceFishpeople Investors, LLCSEC Form ADV filing data 2011 to 2024 (every filing, Schedule D 7.B.(1) private funds, Schedules A/B)
  8. Mar 7, 2023
    3x5 Wws Investors, LLC first reported on Form ADV by 3x5 Partners (Venture Capital Fund), GAV $1,000,000
    Fund first reported on Form ADVFundsFact3x5 Wws Investors, LLCSEC Form ADV filing data 2011 to 2024 (every filing, Schedule D 7.B.(1) private funds, Schedules A/B)
  9. Mar 30, 2022
    Keemotion Investors, LLC no longer reported on Form ADV by 3x5 Partners
    Fund no longer reportedFundsInferenceKeemotion Investors, LLCSEC Form ADV filing data 2011 to 2024 (every filing, Schedule D 7.B.(1) private funds, Schedules A/B)
  10. Mar 30, 2022
    Arch Oncology Investors, LLC first reported on Form ADV by 3x5 Partners (Venture Capital Fund), GAV $2,777,275
    Fund first reported on Form ADVFundsFactArch Oncology Investors, LLCSEC Form ADV filing data 2011 to 2024 (every filing, Schedule D 7.B.(1) private funds, Schedules A/B)
  11. Dec 1, 2021
    Joseph Richard Biller joined Schedule A of 3x5 Partners as Trustee Joseph R Biller Trust
    Person joinedPeopleFactJoseph Richard BillerSEC Form ADV filing data 2011 to 2024 (every filing, Schedule D 7.B.(1) private funds, Schedules A/B)
  12. Mar 29, 2021
    3x5 Aaf Holdings, LLC first reported on Form ADV by 3x5 Partners (Venture Capital Fund), GAV $5,940,000
    Fund first reported on Form ADVFundsFact3x5 Aaf Holdings, LLCSEC Form ADV filing data 2011 to 2024 (every filing, Schedule D 7.B.(1) private funds, Schedules A/B)
  13. Mar 29, 2021
    3x5 Partners Fund Iii-B, L.P. first reported on Form ADV by 3x5 Partners (Venture Capital Fund), GAV $12,732,000
    Fund first reported on Form ADVFundsFactAmerican Century Venture Fund I-B, LPSEC Form ADV filing data 2011 to 2024 (every filing, Schedule D 7.B.(1) private funds, Schedules A/B)
  14. Mar 27, 2020
    Smart Wires Investors, LLC first reported on Form ADV by 3x5 Partners (Venture Capital Fund), GAV $23,260,000
    Fund first reported on Form ADVFundsFactSmart Wires Investors, LLCSEC Form ADV filing data 2011 to 2024 (every filing, Schedule D 7.B.(1) private funds, Schedules A/B)
  15. Mar 27, 2020
    Rubicon Global Investors, LLC first reported on Form ADV by 3x5 Partners (Venture Capital Fund), GAV $36,000,000
    Fund first reported on Form ADVFundsFactRubicon Global Investors, LLCSEC Form ADV filing data 2011 to 2024 (every filing, Schedule D 7.B.(1) private funds, Schedules A/B)
  16. Mar 27, 2020
    Vapotherm Investors, LLC first reported on Form ADV by 3x5 Partners (Venture Capital Fund), GAV $26,923,000
    Fund first reported on Form ADVFundsFactVapotherm Investors, LLCSEC Form ADV filing data 2011 to 2024 (every filing, Schedule D 7.B.(1) private funds, Schedules A/B)
  17. Mar 27, 2020
    Smart Wires Investors II, LLC first reported on Form ADV by 3x5 Partners (Venture Capital Fund), GAV $8,535,000
    Fund first reported on Form ADVFundsFactSmart Wires Investors II, LLCSEC Form ADV filing data 2011 to 2024 (every filing, Schedule D 7.B.(1) private funds, Schedules A/B)
  18. Mar 27, 2020
    Smart Wires Credit Facility, LLC first reported on Form ADV by 3x5 Partners (Venture Capital Fund), GAV $4,950,000
    Fund first reported on Form ADVFundsFactSmart Wires Credit Facility, LLCSEC Form ADV filing data 2011 to 2024 (every filing, Schedule D 7.B.(1) private funds, Schedules A/B)
  19. Mar 27, 2020
    Artms Investors, LLC first reported on Form ADV by 3x5 Partners (Venture Capital Fund), GAV $1,500,000
    Fund first reported on Form ADVFundsFactArtms Investors, LLCSEC Form ADV filing data 2011 to 2024 (every filing, Schedule D 7.B.(1) private funds, Schedules A/B)
  20. Mar 27, 2020
    Keemotion Investors, LLC first reported on Form ADV by 3x5 Partners (Venture Capital Fund), GAV $300,000
    Fund first reported on Form ADVFundsFactKeemotion Investors, LLCSEC Form ADV filing data 2011 to 2024 (every filing, Schedule D 7.B.(1) private funds, Schedules A/B)
  21. Mar 27, 2020
    Zero Mass Water Investors, LLC first reported on Form ADV by 3x5 Partners (Venture Capital Fund), GAV $27,493,000
    Fund first reported on Form ADVFundsFactZero Mass Water Investors, LLCSEC Form ADV filing data 2011 to 2024 (every filing, Schedule D 7.B.(1) private funds, Schedules A/B)
  22. Mar 27, 2020
    Fishpeople Investors, LLC first reported on Form ADV by 3x5 Partners (Venture Capital Fund), GAV $7,950,000
    Fund first reported on Form ADVFundsFactFishpeople Investors, LLCSEC Form ADV filing data 2011 to 2024 (every filing, Schedule D 7.B.(1) private funds, Schedules A/B)
  23. Mar 29, 2019
    3x5 Partners Fund III, LP first reported on Form ADV by 3x5 Partners (Venture Capital Fund), GAV $29,850,000
    Fund first reported on Form ADVFundsFactAmerican Century Venture Fund I, LPSEC Form ADV filing data 2011 to 2024 (every filing, Schedule D 7.B.(1) private funds, Schedules A/B)
  24. Mar 24, 2016
    3x5 Partners first filed Form ADV (ERA, venture capital fund adviser exemption)
    First SEC adviser filingOrganizationFactSEC Form ADV filing data 2011 to 2024 (every filing, Schedule D 7.B.(1) private funds, Schedules A/B)
Classification history
  1. Sep 12, 2026
    Institutional venture firm (confirmed, 95%, cls-1)
    venture manager, reported GAV $72M across 9 vehicles
Evidence
54 observations from 3 sources
Every observation behind this profile, with its source, date and class
FactValueEffectiveClassSource
Why admittedvc_exemption,vc_funds_reportedMar 13, 2026FactSEC Form ADV monthly roster (registered + exempt reporting advisers)
SEC exemption claimedventure_capital_fund_adviserMar 13, 2026FactSEC Form ADV monthly roster (registered + exempt reporting advisers)
SEC exemption claimedventure_capital_fund_adviserMar 5, 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 13, 2026FactSEC Form ADV monthly roster (registered + exempt reporting advisers)
SEC adviser typeexempt_reporting_adviserMar 5, 2024FactSEC Form ADV filing data 2011 to 2024 (every filing, Schedule D 7.B.(1) private funds, Schedules A/B)
First Form ADV filing2016-03-24Mar 5, 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 filing2026-03-13Mar 13, 2026FactSEC Form ADV monthly roster (registered + exempt reporting advisers)
Latest Form ADV filing2024-03-05Mar 5, 2024FactSEC Form ADV filing data 2011 to 2024 (every filing, Schedule D 7.B.(1) private funds, Schedules A/B)
SEC statusERA - ActiveMar 13, 2026FactSEC Form ADV monthly roster (registered + exempt reporting advisers)
SEC status effective2016-03-24Mar 13, 2026FactSEC Form ADV monthly roster (registered + exempt reporting advisers)
Venture share of reported funds1Mar 5, 2024FactSEC Form ADV filing data 2011 to 2024 (every filing, Schedule D 7.B.(1) private funds, Schedules A/B)
Business phone541-490-5155Mar 13, 2026FactSEC Form ADV monthly roster (registered + exempt reporting advisers)
Business phone5038087900Mar 5, 2024FactSEC Form ADV filing data 2011 to 2024 (every filing, Schedule D 7.B.(1) private funds, Schedules A/B)
Contact page urlhttps://www.americancentury.com/institutional-investors/support-center/contact/
“contact page linked from the home page”
Sep 16, 2026FactVenture organization websites (about, team, portfolio, thesis, news pages)
DescriptionPrivate investments offer qualified investors the ability to invest in companies and instruments that aren
“meta description”
Sep 16, 2026FactVenture organization websites (about, team, portfolio, thesis, news pages)
DescriptionPrivate investments offer qualified investors the ability to invest in companies and instruments that aren
“meta description”
Sep 13, 2026FactVenture organization websites (about, team, portfolio, thesis, news pages)
HeadquartersPortland, ORMar 13, 2026FactSEC Form ADV monthly roster (registered + exempt reporting advisers)
HeadquartersPortland, ORMar 5, 2024FactSEC Form ADV filing data 2011 to 2024 (every filing, Schedule D 7.B.(1) private funds, Schedules A/B)
Office address2540 NE MARTIN LUTHER KING JR. BOULEVARD, Portland, OR, 97212Mar 13, 2026FactSEC Form ADV monthly roster (registered + exempt reporting advisers)
Office address2540 NE MARTIN LUTHER KING JR. BOULEVARD, Portland, OR, 97212Mar 5, 2024FactSEC Form ADV filing data 2011 to 2024 (every filing, Schedule D 7.B.(1) private funds, Schedules A/B)
Self-described typeventure_capital
“Our Private Investments team seeks to make venture capital investments in solutions focused solving real world problems and improving human and environmental health.”
Sep 16, 2026FactVenture organization websites (about, team, portfolio, thesis, news pages)
Self-described typeventure_capital
“Our Private Investments team seeks to make venture capital investments in solutions focused solving real world problems and improving human and environmental health.”
Sep 13, 2026FactVenture organization websites (about, team, portfolio, thesis, news pages)
Legal formLimited Liability CompanyMar 13, 2026FactSEC Form ADV monthly roster (registered + exempt reporting advisers)
Legal formLimited Liability CompanyMar 5, 2024FactSEC Form ADV filing data 2011 to 2024 (every filing, Schedule D 7.B.(1) private funds, Schedules A/B)
Private funds reported5Mar 13, 2026FactSEC Form ADV monthly roster (registered + exempt reporting advisers)
Private funds reported9Mar 5, 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)$28.7MMar 13, 2026FactSEC Form ADV monthly roster (registered + exempt reporting advisers)
Private fund gross assets (reported)$72.0MMar 5, 2024FactSEC Form ADV filing data 2011 to 2024 (every filing, Schedule D 7.B.(1) private funds, Schedules A/B)
Stated geographyasia,australia,germany,global,uk,united states
“geography words on the home page”
Sep 16, 2026FactVenture organization websites (about, team, portfolio, thesis, news pages)
Stated geographyasia,australia,germany,global,uk,united states
“geography words on the home page”
Sep 13, 2026FactVenture organization websites (about, team, portfolio, thesis, news pages)
Stated sectorshealthcare,biotech,medtech,climate,energy,logistics,agtech
“sector words on the home page”
Sep 16, 2026FactVenture organization websites (about, team, portfolio, thesis, news pages)
Stated sectorshealthcare,biotech,medtech,climate,energy,logistics,agtech
“sector words on the home page”
Sep 13, 2026FactVenture organization websites (about, team, portfolio, thesis, news pages)
Stated stagesgrowth,early
“stage words on the home page”
Sep 16, 2026FactVenture organization websites (about, team, portfolio, thesis, news pages)
Stated stagesgrowth,early
“stage words on the home page”
Sep 13, 2026FactVenture organization websites (about, team, portfolio, thesis, news pages)
Team pagehttps://www.americancentury.com/institutional-investors/team/private-investments/
“2 name/title pairs read”
Sep 16, 2026FactVenture organization websites (about, team, portfolio, thesis, news pages)
Team pagehttps://www.americancentury.com/institutional-investors/team/private-investments/
“6 name/title pairs read”
Sep 13, 2026FactVenture organization websites (about, team, portfolio, thesis, news pages)
Venture funds reported5Mar 13, 2026FactSEC Form ADV monthly roster (registered + exempt reporting advisers)
Venture funds reported9Mar 5, 2024FactSEC Form ADV filing data 2011 to 2024 (every filing, Schedule D 7.B.(1) private funds, Schedules A/B)
WebsiteHTTP://WWW.3X5FUND.COMMar 5, 2024FactSEC Form ADV filing data 2011 to 2024 (every filing, Schedule D 7.B.(1) private funds, Schedules A/B)
Website resolved domainamericancentury.com
“https://3x5fund.com/ redirected to https://www.americancentury.com/institutional-investors/team/private-investments/”
Sep 16, 2026FactVenture organization websites (about, team, portfolio, thesis, news pages)
Website resolved domainamericancentury.com
“https://3x5fund.com/ redirected to https://americancentury.com/”
Sep 14, 2026FactVenture organization websites (about, team, portfolio, thesis, news pages)
Site titleAmerican Century Private Investments™ | American Century
“title tag”
Sep 16, 2026FactVenture organization websites (about, team, portfolio, thesis, news pages)
Site titleAmerican Century Private Investments™ | American Century
“title tag”
Sep 13, 2026FactVenture organization websites (about, team, portfolio, thesis, news pages)