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J4 Ventures

421 Hudson Street, #713, New York, 10014, United States

Overview

Early stage investment in technology and tech-enabled businesses.

Founded

2021

Deals ยท 12mo

1

Links

WebsiteLinkedIn

Stage focus

Seed

Geographic focus

United States

Sector focus

Information Technology
Internet
Software

Investment portfolio

9rounds
NAMEDATESIZE
Hearvana
Aug 2026Participated
$6 MSeed
Ethosphere
Sep 2025Participated
$3 MSeed
Sonar
Feb 2025Participated
$2 MOther Equity
Reset Financial Technologies
Jul 2024Participated
$2 MSeed
Sound Health
Jul 2024Led
$7 MSeed
Molten Industries
Jun 2024Participated
$25 MSeries A
Spiffy AI
Dec 2023Participated
$6 MOther Equity
Upwardli
Feb 2023Participated
$2 MSeed
Yoodli
Aug 2022Participated
$6 MSeed
Hearvana
Aug 2026Participated
$6 MSeed
Ethosphere
Sep 2025Participated
$3 MSeed
Sonar
Feb 2025Participated
$2 MOther Equity
Reset Financial Technologies
Jul 2024Participated
$2 MSeed
Sound Health
Jul 2024Led
$7 MSeed
Molten Industries
Jun 2024Participated
$25 MSeries A
Spiffy AI
Dec 2023Participated
$6 MOther Equity
Upwardli
Feb 2023Participated
$2 MSeed
Yoodli
Aug 2022Participated
$6 MSeed
9
Items
Browse all public portfolio deals

Insights

Time horizon

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Deal Distribution

J4 Ventures: 9 funding rounds are recorded in the selected participation categories.All available history.
J4 Ventures: 9 funding rounds are recorded in the selected participation categories. All available history
Round typeLed dealsParticipated deals
Seed15
Series A01
Other Equity02

Monthly Deal Activity

J4 Ventures: 9 deals are recorded across 51 months.All available history.
J4 Ventures: 9 deals are recorded across 51 months. All available history
MonthDeals
Aug '221
Sep '220
Oct '220
Nov '220
Dec '220
Jan '230
Feb '231
Mar '230
Apr '230
May '230
Jun '230
Jul '230
Aug '230
Sep '230
Oct '230
Nov '230
Dec '231
Jan '240
Feb '240
Mar '240
Apr '240
May '240
Jun '241
Jul '242
Aug '240
Sep '240
Oct '240
Nov '240
Dec '240
Jan '250
Feb '251
Mar '250
Apr '250
May '250
Jun '250
Jul '250
Aug '250
Sep '251
Oct '250
Nov '250
Dec '250
Jan '260
Feb '260
Mar '260
Apr '260
May '260
Jun '260
Jul '260
Aug '261
Sep '260
Oct '260

Sector Breakdown

J4 Ventures: AI & Machine Learning is the largest displayed sector by deal count (4 deals).All available history.

A deal can appear in multiple sectors, so sector totals may overlap. Capital represents disclosed total round sizes, not fund cheque sizes.

J4 Ventures: AI & Machine Learning is the largest displayed sector by deal count (4 deals). All available history
SectorDeals
AI & Machine Learning4
Health & Life Sciences3
Networks, Cloud & Communication2
Enterprise Software2
Fintech2
Hardware & Robotics1
Media & Entertainment1
E-Commerce & Retail1
Clean Energy & Sustainability1
Space & Frontier Tech1

Deal Size Distribution

J4 Ventures: 9 rounds have a disclosed size in the displayed size bands.All available history.

Undisclosed round sizes are excluded. Capital represents total round sizes, not fund cheque sizes.

J4 Ventures: 9 rounds have a disclosed size in the displayed size bands. All available history
Round size band (USD)Deals
<$5M4
$5M-$10M4
$10M-$25M0
$25M-$50M1
$50M-$100M0
$100M-$250M0
$250M-$500M0
$500M-$1B0
$1B+0

Deals By Geography

J4 Ventures: United States has the largest recorded deal count among the displayed regions (9 deals).All available history.

Top 1 of 1 regions; European countries are grouped as Europe.

J4 Ventures: United States has the largest recorded deal count among the displayed regions (9 deals). All available history
RegionDeals
United States9
J4 Ventures: 20 co-investors are shown, with Moai Capital sharing 4 recorded deals.All available history.

Co-Investors

Bubble size = shared deals

Click a bubble to open that fund in a new tab.

Shows up to 20 co-investors ranked by shared deals. Deals may be shared with multiple funds, so rows overlap. Capital is total round size, not fund cheque size.

J4 Ventures: 20 co-investors are shown, with Moai Capital sharing 4 recorded deals. All available history
Co-investorShared deals
Moai Capital4
AI2 Incubator3
Ascend3
Point72 Ventures3
Pack Ventures2
Amazon1
Avesta Fund1
Breakthrough Energy Ventures1
Carya Venture Partners1
Cascade1
Cercano Management1
Dundee Venture Capital1
Endurance1
Fifty Years1
Fortson VC1
GSR Ventures1
Hike Ventures1
Madrona Venture Group1
Nina Capital1
Pear VC1

Investment Strategy

J4 Ventures: Led accounts for 11% and participating for 89% of round participation.All available history.
J4 Ventures: Led accounts for 11% and participating for 89% of round participation. All available history
CategoryDeals (count)Share (%)
Led111%
Participating889%
J4 Ventures: Single-lead accounts for 0% and co-led for 100% of lead dynamics.All available history.
J4 Ventures: Single-lead accounts for 0% and co-led for 100% of lead dynamics. All available history
CategoryDeals (count)Share (%)
Single-lead00%
Co-led1100%

Team

Bruce Jaffe

General Partner

Jamie Rapperport

General Partner