Glasswing Ventures

Glasswing Ventures is a Boston-based early-stage venture capital firm founded in 2016 by Rick Grinnell and Rudina Seseri. The firm has raised three funds totaling approximately $400M in assets under management, with its most recent Fund III closing at $203 million in November 2025—an oversubscribed fund that drew coverage from the Wall Street Journal, Boston Business Journal, and Venture Capital Journal.

Glasswing's investment thesis centers on AI-native and frontier technology companies transforming enterprise B2B and cybersecurity markets. Unlike VCs that treat AI as a feature layer, Glasswing looks for companies where artificial intelligence is the core differentiator—not an add-on to an otherwise conventional product.

The firm has invested in more than 60 portfolio companies across sectors ranging from security automation and data analytics to quantum computing and vertical AI applications. Notably, Glasswing was the first institutional investor in 91% of its portfolio companies—a reflection of their willingness to back founders at the earliest stages.

For founders building AI-native enterprise software or cybersecurity companies, understanding Glasswing's specific thesis, team dynamics, and sourcing approach can significantly improve your odds of securing a meeting.

Glasswing Ventures invests in early-stage AI-native and frontier technology companies transforming enterprise B2B and cybersecurity markets. The firm's thesis has three explicit priority areas: vertical AI applications, intelligent enterprise defense (cybersecurity), and next-generation compute infrastructure.

The distinguishing factor in Glasswing's approach is their insistence that AI be foundational rather than incremental. They look for companies where machine learning, large language models, or agentic AI capabilities are intrinsic to how the product works—not bolted on as a chat interface over legacy architecture.

According to Rudina Seseri, Glasswing's Founder and Managing Partner, the firm seeks 'visionary, early-stage founders' who are using AI and frontier technology to disrupt markets that have historically been resistant to change. The firm's 62+ member advisory council—recently expanded with 14 new industry executives—provides portfolio companies with C-level expertise across healthcare, data infrastructure, enterprise software, and cybersecurity.

Glasswing typically leads or co-leads rounds, preferring to invest $1M to $5M at the seed and Series A stages, though the firm also writes pre-seed checks as small as $100K. Their investment horizon is long-term; they have demonstrated commitment to portfolio companies through multiple financing rounds.

The firm evaluates investments across several dimensions: the depth of the founding team's domain expertise, the size and accessibility of the target market, the defensibility of the technology or data moat, and evidence of early product-market fit. Glasswing has a notable preference for founders who have personally experienced the problem they are solving—seasoned operators rather than first-time founders without relevant operating experience.

Glasswing closed its $203 million Fund III in November 2025, oversubscribed despite a challenging fund-raising environment. The Wall Street Journal profiled the firm as defying market conditions to raise its third fund, highlighting Glasswing's disciplined focus on AI-native companies as the differentiating factor.

The firm made 16 new investments in 2025 and has announced 16 total exits across its history. Notable recent investments include Cydelphi (AI-native digital forensics and incident response, $3M seed lead), Realm Security ($15M Series A), Basetwo ($11.5M Series A), Labviva ($25M Series B), Tensorstax ($5M seed for AI-native data engineering), Infinity Loop ($5M seed for AI contract intelligence), Iris Finance ($6.2M seed for AI-native FP&A), Asepha ($4M seed for agentic pharmaceutical workflows), and Ship Angel ($5M seed for AI-native global shipping).

Glasswing's investment activity in 2025 also included frontier technology plays like Atlantic Quantum (scalable quantum computing) and Common Sense Machines (3D generative AI for creative workflows), reflecting the firm's willingness to invest in genuinely novel compute and AI paradigms.

The firm's Building Partners model—a team of operating partners and C-level advisors—provides hands-on support to portfolio companies. This includes assistance with go-to-market strategy, hiring, product development, and follow-on fundraising. The model is explicitly designed to give early-stage founders access to expertise they would otherwise lack.

Glasswing's portfolio spans more than 60 companies across cybersecurity, data infrastructure, vertical AI, and frontier technology. Some of the most well-known portfolio companies include Cribl (cloud-native data management, raised significantly post-Glasswing), Recorded Future (AI-driven threat intelligence), DataVisor (fraud detection using AI), Veritone (enterprise AI platform, went public), Virtru (data security and privacy), Abnormal Security (cloud email security, unicorn status), Demisto (security automation, acquired by Palo Alto Networks), and CyberGRX (third-party cyber risk management).

In the AI-native enterprise category, notable holdings include Iris Finance (profit planning for consumer brands), Asepha (agentic automation for pharmaceutical workflows), Basetwo (AI copilot for manufacturing engineers), Tensorstax (autonomous AI agentic platform for data engineering), Infinity Loop (AI contract intelligence), and Ship Angel (freight workflow automation for enterprise supply chains).

The portfolio also includes several companies addressing specialized vertical markets: Labviva (AI marketplace for scientific products), Verusen (AI inventory optimization for manufacturers), Krane (AI for construction supply chain materials), and Beacon Software (AI for state and local government operations).

Portfolio companies benefit from Glasswing's extensive network of advisors and potential customers. The firm's advisory council includes senior executives from Google, Microsoft, Salesforce, ServiceNow, Four Seasons, Stitch Fix, HPE Aruba, and athenahealth, among others. Sir Tim Berners-Lee, inventor of the World Wide Web and co-founder of Inrupt, also serves on the advisory council, providing portfolio companies access to expertise in data sovereignty and decentralized infrastructure.

Glasswing evaluates potential investments based on four primary criteria: founding team depth, market opportunity, technology defensibility, and evidence of traction.

On team quality, Glasswing has a documented preference for experienced operators. Rick Grinnell has noted that the firm looks for founders who 'have been in the trenches'—executives who have built, scaled, and exited (or failed at) companies before. The firm invested in Cydelphi partly because its founders had 'collaborated for over 20 years' at organizations including NTT Security and Breach Security. First-time founders are not excluded, but they face a higher bar without domain-relevant operating experience.

Market size and accessibility matter significantly. Glasswing looks for large markets that are historically resistant to disruption—legacy industries where incumbent vendors have allowed service quality to lag. The cybersecurity market, enterprise data infrastructure, and vertical AI applications in healthcare, manufacturing, and supply chain all fit this profile.

Technology defensibility is assessed through the lens of whether the company has proprietary data, exclusive partnerships, or unique technical advantages that compound over time. Glasswing looks for moats that widen rather than erode as the company scales.

Traction metrics matter, but Glasswing is known for being realistic about what early traction looks like. For pre-seed and seed-stage companies, evidence of product-market fit might mean a handful of paying customers, strong NPS scores, or clear usage data showing the product is solving a burning problem. The firm has shown patience with companies that have long sales cycles but strong enterprise demand signals.

Glasswing Ventures sources the majority of its deals through warm introductions from portfolio founders, LPs, and trusted members of the entrepreneurial ecosystem. Cold inbound is less productive; the firm receives thousands of pitch decks annually and most meetings are pre-arranged through relationships.

The most effective outreach path is through a personal connection to a Glasswing portfolio founder, another venture investor who knows the firm, or an attorney or advisor in the firm's extended network. Building genuine relationships before pitching is strongly preferred over transactional cold outreach.

If a warm introduction is not available, the firm's website (glasswing.vc) provides limited contact options. Any cold outreach should be concise, firm-specific (referencing Glasswing's actual portfolio or thesis), and include clear evidence of traction. Generic 'we're an AI company' pitches are filtered immediately.

When preparing for a meeting with Glasswing, expect to discuss your market size, competitive landscape, business model, traction metrics, and fundraising plans in detail. The firm's partners are known for deep technical due diligence—questions about your architecture, data pipeline, and model training are common in AI-focused pitches. Be ready to defend your assumptions with evidence.

The due diligence process typically takes 2-4 weeks from initial meeting to term sheet, though timing varies based on deal complexity and firm bandwidth. Following up without being pushy is appropriate; send progress updates on any material milestones achieved after your initial meeting.

Building a long-term relationship with Glasswing can pay dividends even if your current round does not result in an investment. The firm maintains relationships with founders over multiple fund cycles and may be interested in future rounds or can provide valuable introductions to other investors.

While Glasswing Ventures invests in early-stage companies, they expect founders to have a solid command of their financials. This includes understanding your burn rate, runway, SaaS unit economics, and realistic path to profitability or the next funding round.

For AI-native companies, investors will scrutinize your cost structure carefully—particularly the economics of model inference, data storage, and customer acquisition. Glasswing's advisory council includes CFOs and finance executives who can help portfolio companies build investor-ready financial models.

Many first-time founders underestimate the importance of financial preparedness when raising capital. Investors want to see that you understand the mechanics of your business and have grounded your projections in evidence rather than optimistic assumptions.

Working with a fractional CFO can significantly improve your chances of securing funding. Professional financial guidance helps you build accurate projections, prepare investor-ready financials, and confidently answer due diligence questions about your metrics.

Our team has helped numerous companies raise venture capital and would be happy to discuss how we can support your fundraising efforts. From pitch deck financials to comprehensive financial models, we ensure you're prepared for the investment process.

Financial projections should be realistic and grounded in evidence. Glasswing will challenge your assumptions and scrutinize your SaaS unit economics. Be prepared to explain the basis for your forecasts and demonstrate that you have considered multiple scenarios.

Whether you're preparing to pitch Glasswing Ventures or other top VCs, having professional financials can set you apart from the competition. Our team understands what investors look for in financial presentations and can help you build a compelling narrative backed by data.

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