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Jeff Fagnan, Partner at Atlas Venture

Jeff Fagnan

Partner @ Atlas Venture

Cambridge, United States

Jeff Fagnan is a founder and managing partner of Accomplice, the most successful and active early-stage venture capital firm in New England. Jeff is known as a founding investor with a long-term, patient capital approach to building companies alongside mission-oriented founders and CEOs. He is one of the industry’s foremost early-stage investors and has arguably the most comprehensive security portfolio in venture today. Jeff began his career in venture capital at Seed Capital Partners in 2004, where he focused on commercializing technology out of MIT and Harvard. He joined Atlas Venture’s tech team in 2006 and personally led the charge to reinvent the firm from a dated, struggling brand with 12 global offices to a single headquarters in Cambridge/Boston, MA. He committed to building a thriving tech and venture community in New England when most firms looked westward or refused to reinvent themselves in a contemporary manner. Jeff led this leaner Atlas Venture, raised a new fund through the financial crisis of 2008, and built it into the top early-stage firm on the East Coast, a firm that CB Insights went on to describe in 2014 as “Tom Brady, David Ortiz, and Atlas Venture – the hometown heroes of Boston." Jeff was the most influential person behind the re-emergence of the Boston tech ecosystem. Over the next 10 years, Jeff pioneered and tweaked the seed-led strategy and has been doing it longer than any other venture firm. In 2015, he co-founded and spun Accomplice out of Atlas as a new firm. Accomplice is now the aspirational venture firm in New England, not through sheer force of capital, but through network, community, and empowerment of entrepreneurs. Dan Primack of Fortune and Axios said in 2017, "When people ask me to name the most important venture capital firm in Boston, my answer is always the same: Accomplice." Jeff crafted the concept of a venture as an API and strengthened the angel investor substrate in Boston and beyond, creating more open source and community-fueled initiatives than anyone else in the history of the venture. These initiatives include: Spearhead (founded 2018), fundamentally altering the framework of venture capital scout programs by giving promising founders their own funds and mentorship to start angel investing. Jeff co-founded Spearhead with AngelList’s Naval Ravikant in 2018. Spearhead provides founders with $200k of investable capital to start and up to $1M total. Spearhead cohort one had over 1500 founders apply for a coveted 20 spots. Spearhead is on its second cohort and the leads so far have invested in more than 75 companies. Maiden Lane (founded 2013), the first online venture fund built on the AngelList platform, backing angels and interesting companies through AngelList's Syndicates product. Maiden Lane co-founders Jeff and Naval Ravikant sourced and diligence all of the syndicate leads and approved all of their individual investments in the portfolio, which included Cruise Automation, earn.com, Sapho, Ticketbis, Branch Metrics, Cabify, Carta, Checkr, ClearTax, Dia&Co, OpenDoor, Poshmark, Postmates, uBiome, Wag, WeFox, and Zymergen. Boston Syndicates (BOSS) (founded in 2014), is the first syndicate on AngelList and a movement to turn successful founders and operators into serial angel investors and boost angel activity in Boston. BOSS has backed local Boston angels in 60 pre-seed companies since its inception. Rev Boston (founded 2015), an exclusive network, event, and award for the top 20 female operators in Boston tech to help break down their barriers to entry around angel investing, VC, executive teams, board membership, and founding companies. TUGG (founded in 2009), is the community engagement platform that connects New England tech entrepreneurs with the riskiest social enterprises serving local under-resourced youth. TUGG has catalyzed over 20 social innovation projects in New England including Resilient Coders, InnerCity Weightlifting, and Catie’s Closet. Accomplice Blockchain Capital (ABC) (founded in 2018), a separate vehicle for investing in nascent blockchain technologies. The four-person team has invested in over 12 projects including Coda, BisonTrails, Near, and Ontology. The portfolio is valued at 4x despite the recent market correction. Primack said in 2017 that Jeff and Atlas “have been laser-focused on fostering a local tech ecosystem that badly needed a catalyst. It also has been a major player in terms of local philanthropy, via its creation of TUGG." Jeff Fagnan graduated from the University of Alaska Anchorage and the University of Rochester.

Total investments:
80
Last investment:
Lead investor:
31%

Last updated:

Industries Jeff Fagnan invests in

SoftwareArtificial IntelligenceSaaSFinTechSecurity

Stages Jeff Fagnan invests in

Series ASeedSeries BPre-SeedSeries C

Countries Jeff Fagnan invests in

United StatesCanadaIndiaIsrael

Round sizes

Seed $500k–$11MSeries A $4.5M–$20MSeries B $8M–$60M

Contacts

TypeContactValidation
Work email
Personal email
Work phone
Personal phone
Socials

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Round size

Seed
$500k–$11M
Series A
$4.5M–$20M
Series B
$8M–$60M

Investment Focus

Industry

  • Software 16 (20%)
  • Artificial Intelligence 8 (10%)
  • SaaS 7 (9%)
  • FinTech 7 (9%)
  • Security 7 (9%)
See all 103 industries →

Stage

  • Series A 18 (23%)
  • Seed 16 (20%)
  • Series B 13 (16%)
  • Pre-Seed 7 (9%)
  • Series C 6 (8%)
See all 12 stages →

Country

  • United States 33 (41%)
  • Canada 3 (4%)
  • India 1 (1%)
  • Israel 1 (1%)

Investments

CompanyDescriptionRoundLinks
Conway is a technology company building software and digital solutions to streamline business operations and accelerate growth. Seed / Oct 02, 2026
Further is on a mission to empower first-time home buyers to achieve their dream of homeownership with confidence and ease. We simplify the complex home buying process through innovative tools and personalized guidance, ensuring that buyers are well-prepared every step of the way. Our platform offers financial planning, tailored insights, andresources designed to make homeownership more accessible. At Further, we believe that with the right support, anyone can realize their goal of owning a home. Join us as we help make the path to homeownership clear and attainable for all. $4.1M / Pre-Seed / Nov 01, 2024
Building the world's first infringement detector. $4.5M / Pre-Seed / Jun 27, 2023
Powerful leak protection from LLMs like ChatGPT, Bard, Bing, or Claude. Deploy protection today. $4M / Pre-Seed / Jun 27, 2023
Infringements Infringements
Monitor your patents and get instant alerts on potential infringements. $4M / Pre-Seed / Jun 27, 2023
IPR-tested prior art search. The ultimate patent invalidation tool. $4M / Pre-Seed / Jun 27, 2023
Problems solved: - Multi-hop reasoning - Compound system data portability - Sub-second, multi-thousand data point synthesization - Multi-domain, multi-topic, multi-subject simultaneous analysis - Lossless recall - Zero hallucinations - And many, many more...Built. In Production. (Currently the reasoning engine powering Patented.ai to solve thehardest problems in litigation.) Pre-Seed / Jun 27, 2023
Darwinium develops a decision technology platform to match security, fraud, and customer experience. It utilizes integrated machine learning, orchestration, and analytics to safeguard mobile apps, websites, and APIs against advanced automated attacks by protecting customer privacy and minimizing risk exposure with anonymization, masking, and securecomputing techniques. $10M / Seed / Nov 03, 2022
Gigasheet delivers healthcare market intelligence powered by AI and the industry’s most comprehensive price transparency data. The platform ingests and analyzes billions of payer and provider rate records from Transparency in Coverage datasets, structuring them into usable, queryable intelligence. Its AI models benchmark rates, identify outliers,and surface savings or growth opportunities automatically. Users can combine their own claims or network data within a scalable, spreadsheet-like interface to generate consultant-level insights without engineering effort. Gigasheet’s technology turns complex healthcare pricing data into fast, explainable intelligence that drives smarter contracting and network decisions. $7M / Series A / Jun 02, 2022
Dig Security is a cloud data security startup that provides real-time visibility, control, and protection of data assets. Monitoring and detecting data exfiltration and policy violations has become a challenging problem with few, fragmented solutions as enterprises transition to complex settings with dozens of different database types acrossclouds. To help businesses better manage cloud data sprawl, Dig's cloud-native and entirely agentless methodology reinvents cloud DLP with DDR (Data Detection & Response) capabilities. $11M / Seed / May 19, 2022
See all 80 investments →

Co-Investors

Atlas Venture

About Atlas Venture

VC Fund · Cambridge, United States

Atlas Venture is an early-stage venture capital firm that creates and invests in biotech startup companies led by promising entrepreneurs focusing on life sciences innovation. Its seed-led venture creation strategy rigorously selects and focuses investment on compelling opportunities to build scalable businesses and realize value.

Atlas Venture Contacts

NameEmailPhoneSocials
Ed Holson
Ed Holson Entrepreneur-in-Residence
Kevin Bitterman
Kevin Bitterman Partner
Michael Gladstone
Michael Gladstone Principal

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FAQ

What does Jeff Fagnan invest in?

Jeff Fagnan invests primarily in Software, Artificial Intelligence and SaaS startups, most often at Series A and Seed stage. Most of the 80 investments tracked by Shizune back companies in United States. The Investment Focus section breaks down every industry, stage and country in the portfolio.

What round sizes does Jeff Fagnan invest in?

Jeff Fagnan typically joins rounds of $500k–$11M at Seed, $4.5M–$20M at Series A and $8M–$60M at Series B. These are whole funding-round sizes, not Jeff Fagnan's own check, which is rarely disclosed: the 10th–90th percentile of the confirmed public funding rounds Jeff Fagnan took part in.

How do I contact Jeff Fagnan?

Public channels for Jeff Fagnan include LinkedIn and the website linked on this profile. For a verified work email and phone number, create a free Shizune account — contact data is searched across 20+ sources and validated before delivery, so your outreach lands in the right inbox.

When did Jeff Fagnan last invest?

The most recent investment recorded for Jeff Fagnan closed in Oct 2026. Shizune tracks 80 investments in total for this profile, including round sizes, stages and portfolio companies, all sourced from confirmed public funding rounds and refreshed monthly.

Is Shizune's investor data accurate?

Yes — every stat on this profile is calculated from confirmed public funding rounds monitored across hundreds of sources since 2020. This profile was last refreshed in Oct 2026 and is updated monthly. Spotted something off? Use the “Suggest an edit” link near the top of the page.

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