SXSouthie 2025 | The Summer Hang For Boston's Founders and Funders
What We're Doing
SXSouthie is BACK (and actually in Southie) with a summer hang for founders and investors in Boston’s early-stage AI ecosystem. 6 leading early-stage Boston VC's have joined forces to bring you a 2025 edition that is going to be the can't miss event of the summer.
Inspired by SXSW, but rooted right in Southie, we’re trading cowboy boots for Red Sox hats and Boston grit.
Come for:
An intentionally social setting to unwind and recharge
Good food, good drinks, and lots of laughs
Meaningful connections without the stuffy atmosphere
About Your Hosts
Flybridge is the early-stage venture capital firm backing the next wave of our AI-powered future—from developer platforms to agentic applications to transformative ideas that 10x how humans work, create, and relate. With 20+ years operating as a first-check fund and a portfolio of 200+ companies, we give founders unmatched access to enterprise customers, technical talent, and our founder-first platform that accelerates growth from day one. In it for the long haul, we invested early in MongoDB, Chief, Splice, NS1, Bowery Farming, Arcee, and CodeAcademy—proving that East Coast advantage creates lasting value.
Glasswing Ventures is a first-capital-in venture capital firm dedicated to investing in startups applying AI and frontier technology to enterprise and cybersecurity markets. The firm was founded by visionary partners with decades of experience in these markets, a disciplined investment approach, and a strong track record of industry-leading returns. Glasswing leverages its deep domain expertise and world-leading advisory councils to invest in exceptional founders who transform markets and revolutionize industries.
NextView Ventures is a high-conviction, hands-on venture capital firm that helps entrepreneurs build companies of consequence to shape a future of collective prosperity. NextView specializes in leading seed and pre-seed rounds in pre-traction businesses that leverage software to tackle mass-market human problems. Since 2011, NextView has invested in 200+ portfolio companies nationally, including Attentive, ThredUP, WHOOP, Devoted Health, Setpoint, TripleLift, and Bobbie.
Underscore VC is a Boston-based venture capital firm backing bold B2B software entrepreneurs at pre-Seed and Seed. Inspired by the principles of open source software — community, collaboration, and transparency — Underscore pioneered an “open source” investing model, sharing investment returns with a vibrant, curated, expert ecosystem — the Underscore Core Community — that sources and supports the startups Underscore backs. Learn more: https://underscore.vc/.
Pillar VC invests in scientific breakthroughs at the very earliest stages. From university labs to independent research, we find and fund the advances that will reshape how we live, work, and solve global challenges. Our firm is co-founded by a group of leading CEOs from companies including DraftKings, Wayfair, Flywire, and Exact Sciences. Our firm's investments span over 90 companies, including category leaders like Circle, Abridge, PillPack, Jellyfish, Hometap, Asimov and Path AI.
Gunderson Dettmer is the leading law firm for venture-backed startups and investors. Its early-stage practice is deeply embedded in the startup ecosystem, representing thousands of high-growth companies from formation through exit. With a sharp focus on innovation, Gunderson provides founders with practical, business-minded legal counsel across formation, fundraising, equity, and IP — helping emerging companies scale with confidence. From seed rounds to Series A and beyond, Gunderson’s track record and deep founder-first approach make it a trusted partner at every critical stage.
Citrin Cooperman’s Technology Industry Group helps innovative companies thrive in a fast paced, competitive market. Our team combines deep industry knowledge with practical business insight to support technology-driven businesses at every stage, from startup to growth and beyond. We provide a full range of tax, accounting, and advisory services tailored to the unique challenges of the tech sector, including strategic planning, revenue recognition, R&D tax credits, fundraising readiness, scaling operations and much more. With a focus on emerging trends and best practices, we help our clients stay ahead of the curve, so they can focus on what they do best: creating the future. For more information contact Tom Porricelli tporricelli@citrincooperman.com
Fidelity Private Shares is committed to supporting the startup & venture capital community. Fidelity helps founders prepare for their next round of funding with our cap table management and data room platform, events that give you access to capital, and premier support to generate, execute & store legal documents. No matter where you are in your journey - from inception to IPO - Fidelity has the expertise to support you.