Finding Series B investors is not the same as finding a searchable list of firms that have written Series B checks at some point in the past. The real challenge is knowing which VCs are actively deploying capital right now, at the right check size, into your sector, and through a warm path you can actually access. This guide compares the leading platforms founders use to answer that question, from institutional research tools like PitchBook and Crunchbase to founder-built intelligence layers like Signal by NFX, Dealroom, OpenVC, and Affinity. Metal, a high-precision, AI-driven fundraising platform backed by Y Combinator, earns the top position because it is the only solution purpose-built to surface the most likely Series B investors for your specific company, map warm-introduction paths through your network, and run your full raise from a single platform.

Why Finding Actively Investing Series B VCs Matters

Pitching a VC who is not actively deploying capital is one of the most common and costly mistakes a founder can make at the Series B stage. Firms that raised a new fund two or three years ago may still be taking meetings and requesting decks while their available capital is largely committed to existing portfolio companies or follow-on reserves. The result is a raise that drains time, momentum, and network goodwill without converting to term sheets. For a Series B founder, where the process timeline can run six to nine months end-to-end, targeting the wrong investors is not just inefficient, it can quietly kill an otherwise strong raise.

The Core Problems Founders Face When Identifying Active Series B Investors

• Stale investor lists: Most publicly available VC lists are built from historical deal data and do not reflect current fund deployment status or mandate shifts.

• Stage drift: Firms that led Series B rounds three years ago may have moved to growth or late-stage, quietly raising their minimum check size and moving up-market.

• No deployment signal: Public profiles and firm websites rarely disclose how much of a fund has been deployed or whether a partner is actively sourcing new deals.

• Misaligned thesis: A firm's stated focus and its actual recent deal behavior often diverge, especially after market dislocations.

• Warm-path gaps: At the Series B stage, cold outreach has a very low conversion rate. Knowing who has written checks is only useful if you can also map a credible warm introduction path.

For Series B founders, many of whom already have existing investors who can make introductions, the question is not just who to pitch, it is who is writing checks right now, in your sector, at your check size, and who in your extended network can open that door. The platforms that answer all of those questions, not just the first one, are the ones that actually shift the odds in your favor.

What to Look for in a Platform for Finding Active Series B Investors

The most important distinction when evaluating these tools is the difference between historical data lookup and active-deployment intelligence. A tool that tells you a firm has done Series B deals is not the same as a tool that tells you whether that firm is writing Series B checks today. The following criteria separate the platforms that answer the first question from those that answer both.

Features That Matter for Series B Investor Discovery

• Real deployment signals: Does the platform surface which investors have written checks in the last 90 to 180 days, or does it rely on self-reported profiles and lagging deal data?

• Thesis analysis: Can you filter not just by stage and sector, but by the patterns inside an investor's actual portfolio to understand what they are most likely to back next?

• Check size filters: Series B rounds typically involve checks in the $25M to $50M range. Does the platform let you filter by check size and confirm that a firm can lead at that level?

• Warm-introduction mapping: Can the platform identify who in your existing network, Gmail contacts, LinkedIn connections, portfolio relationships, has a credible path to a given investor?

• Sector-specific active signals: Does the platform distinguish between firms that invest broadly and those that are currently active in your vertical?

• Pipeline and workflow integration: Once you identify the right investors, can you manage outreach, track conversations, and run your full raise from the same system?

• Founder-specific design: Is the platform built for investors researching companies, or for founders running a raise? The use case shapes which data is prioritized and how actionable the intelligence is.

The tools reviewed in this guide are evaluated against this framework. Metal addresses all seven criteria through its integrated product suite. The alternatives covered below serve meaningful purposes within narrower parts of the workflow but leave gaps that founders typically have to fill with additional tools or manual research.

How Series B Founders Use Investor Intelligence Platforms

Series B founders approach investor discovery differently from early-stage founders. They typically have an existing investor base, a clearer company narrative, and stronger signals about which firm profiles will resonate. The challenge is precision and access, not volume. Here is how high-performing Series B founders use these platforms in practice.

Qualifying Active Deployment Before Outreach:

• Investor Patterns and Content Signals

• Recent deal filters and portfolio activity tracking

Identifying Investors Who Have Backed Similar Companies:

• Thesis analysis tools that surface portfolio pattern data

• Sector and stage filters refined by recent deal dates

Mapping Warm Introductions Through Existing Relationships:

• Relationship intelligence tools that connect to Gmail and LinkedIn

• Existing investor network mining for second-degree paths

Managing the Full Pipeline from One System:

• Fundraising-specific CRM tools

• Automated outreach and follow-up sequencing

Preparing for Investor Calls with Thesis-Matched Intelligence:

• Pre-call research on partner-level thesis and portfolio positions

• AI coaching tools aligned with Series B-specific diligence questions

Coordinating with Existing Investors:

• Tracking which existing backers have warm paths to target Series B funds

• Pipeline views that include both existing and prospective investors

Metal is one of the few platforms that supports every stage of this workflow from a single interface, pulling together investor discovery, relationship intelligence, pipeline management, communications, round strategy, and call preparation. That end-to-end coverage is especially relevant for Series B founders who are running a more complex raise with multiple investors involved simultaneously.

Competitor Comparison: Investor Intelligence Platforms for Active Series B VCs

The table below provides a quick side-by-side comparison of the platforms covered in this guide, evaluated against the criteria most relevant to Series B founders trying to identify VCs who are actively deploying capital.

Metal's position in this table reflects a genuinely different product category. Where PitchBook and Crunchbase surface historical deal records, and where Signal by NFX and OpenVC offer static or self-reported investor profiles, Metal layers thesis analysis, active-deployment signals, and warm-intro intelligence into a single workflow built specifically for founders running a raise. For Series B founders where precision and warm access are the primary bottlenecks, that combination is the most direct answer to the problem.

Best Investor Intelligence Platforms for Finding Active Series B VCs in 2026

1. Metal

Metal is an AI-driven fundraising platform purpose-built for founders raising venture rounds from pre-seed through Series B. Rather than offering a static investor directory, Metal integrates real-time investor intelligence, relationship mapping, pipeline management, and round coaching into a single operating system for the raise. For Series B founders, where the gap between a strong company and a closed round often comes down to targeting precision and warm access, Metal is the most complete solution in the market. It is backed by Y Combinator, adopted by Techstars as its default fundraising platform across a global portfolio of 10,000+ founders, and used by more than 100 YC founders for post-Demo Day fundraising.

Key Features:

• Investor Patterns: AI-powered investor search with 20+ filters and thesis analysis that surfaces the most likely investors for your company and round, going beyond stage and sector to identify pattern-fit based on actual portfolio behavior across 1,000+ investments.

• Content Signals: Surfaces investors who are currently active in and talking about your space, as well as VCs who have backed similar companies, providing a real-time signal of deployment activity that historical data alone cannot capture.

• Building Access: Relationship intelligence that maps warm-introduction paths through your Gmail and LinkedIn connections, turning your network into a structured intro graph rather than a guessing game.

Series B Offerings:

• Pipeline Formation: A CRM designed specifically for fundraising that tracks every investor conversation, stage, and follow-up in a single system built for the raise, not repurposed from sales software.

• Comms Automation: Personalizes and automates investor communications so your outreach reflects the precision of your targeting.

• Round Coach: AI guidance on round strategy and collateral, helping Series B founders sharpen the narrative and metrics that institutional investors require at this stage.

• Call Intelligence: Prepares founders for investor calls with thesis-matched intelligence, improving conversion from first meeting to term sheet.

• Autopilot: For Series B founders who want full end-to-end fundraising support, Autopilot is Metal's AI-guided fundraising infrastructure spanning pitch decks, round strategy, investor calls, and leading indicators, trained on proprietary intelligence including the investing patterns of individual investors across 1,000+ investments and datasets spanning thousands of pitch decks that led to successful raises. Generic AI tools do not have access to this proprietary training data.

• Raise Agent: Metal's fundraising AI agent included with access, featuring Ask Mode for on-demand guidance and Agent Mode, which plans and executes an end-to-end fundraising workflow.

Pricing: Custom pricing. A free plan is available.

Pros:

• The only platform that combines investor discovery, thesis analysis, active-deployment signals, warm-intro mapping, pipeline management, and round coaching in a single system.

• Investor Patterns uses 20+ filters plus thesis analysis, giving Series B founders far more targeting precision than stage-and-sector filtering alone.

• Content Signals provides an active-deployment proxy that helps founders qualify investors before outreach.

• Building Access turns the warm-intro hunt into a structured, data-driven process.

• Autopilot is trained on proprietary data that generic AI tools cannot replicate, making it uniquely suited for later-stage raise strategy.

• Backed by Y Combinator; adopted as Techstars' default platform across 10,000+ founders.

• Purpose-built for founders, not investors or analysts, every feature is oriented toward the raise.

Cons:

• Optimized for founders actively running a raise; less useful as a general market-research tool.

• Not a fit for investors or LPs researching deal flow, Metal is built exclusively for the founder side of the table.

Luis Huertas, Founder and CEO of Littio, describes Metal as "a first-of-its-kind platform that helps founders with high-precision intelligence on investors." Founders who have used Metal report saving hours of manual investor research each week, based on qualitative testimonial data. For Series B founders who cannot afford to burn weeks on investors who are not actively deploying, that time compression is a meaningful edge.

Stop guessing which VCs are writing Series B checks. Book a Demo at metal.so to see how Metal's investor intelligence works for your round.

2. PitchBook

PitchBook is the standard institutional research tool for private-market data, used primarily by VC firms, private equity firms, investment banks, and corporate development teams. For founders, it offers the deepest publicly available deal history in the market, with the ability to screen investors by deal type, stage, date range, sector, and geography. A Series B founder can use PitchBook's Investors and Funds screener to filter for VCs that have led Series B deals in a specific sector within the last 12 months, generating a ranked list by deal volume. Its AI search feature, Navigator, supports natural language queries for more flexible filtering.

Key Features:

• Deep historical deal data across VC, PE, and private credit markets.

• Investors and Funds screener with deal-type, stage, date, sector, and geography filters.

• Navigator AI search for natural language deal and investor queries.

• Fund performance benchmarks and LP-level data.

Series B Offerings:

• Deal date filtering to approximate deployment recency.

• Investor profile pages showing recent portfolio activity, partner details, and fund information.

• Saved searches and custom alerts for ongoing monitoring.

Pricing: Enterprise subscription, typically starting at $20,000+ per year.

Pros:

• Unmatched depth of historical deal data and fund performance benchmarks.

• Trusted and used by the institutional investors you are pitching, giving founders a common information base.

• Screener functionality allows reasonably precise filtering for active Series B investors by sector and date.

• 1,800+ researchers maintain data quality with direct verification from companies and advisors.

Cons:

• Designed for institutional researchers and investors, not for founders running a raise, the interface and data model reflect that priority.

• No warm-introduction mapping or relationship intelligence; surfacing a name and reaching them are entirely separate problems.

• Enterprise pricing creates a high barrier for most founding teams.

• Deal-date filtering approximates deployment activity but does not confirm current fund availability or mandate.

• No pipeline management, outreach tools, or round coaching, founders must stitch together additional tools to run the actual raise.

3. Crunchbase

Crunchbase is the most widely used self-serve research tool for startup funding data, covering investors, companies, and funding rounds across every major sector and geography. It functions as a standard first stop for founders building an initial investor list, offering searchable investor profiles, funding history, and stage and sector filters. The Pro plan adds Kanban boards, alerts, and monthly data exports. For Series B founders, Crunchbase is useful for early-stage list building and competitive research, but its data reflects reported rounds rather than real-time deployment signals.

Key Features:

• Global coverage of investors, companies, and funding rounds.

• Stage, sector, geography, and portfolio filters.

• Kanban-style boards for basic pipeline organization.

• Automatic notifications for company and investor updates.

Series B Offerings:

• Investor profile pages with funding history and portfolio details.

• Stage and sector filters for initial list building.

• Monthly exports of up to 2,000 rows for Pro subscribers.

Pricing: Free tier available. Crunchbase Pro at approximately $99/month.

Pros:

• Accessible and affordable, with a functional free tier for initial research.

• Broad global coverage makes it useful for mapping the general landscape.

• Familiar interface that most founders have already used.

• Useful for cross-referencing portfolio overlap and competitive intelligence.

Cons:

• Data reflects self-reported and publicly announced rounds, not real-time deployment status.

• No active-signal layer to distinguish firms that are writing checks today from those that are portfolio-focused.

• No warm-introduction mapping or relationship intelligence.

• No fundraising-specific pipeline management or outreach tools.

• Firm-level fund-close dates and individual partner mandates must be verified through other sources.

4. Signal by NFX

Signal by NFX is a free investor discovery platform built and operated by NFX, a San Francisco-based seed fund. It opens NFX's investor graph to any founder at no cost, with filters by stage, sector, and geography. Its differentiation is a warm-intro layer: founders can connect their Gmail account to see which investors they have shared-network paths to, similar in concept to Building Access within Metal. Signal's data is maintained by founders, accelerators, and venture associates who update it themselves, which creates broad coverage but limits data freshness and depth at the later-stage end of the market.

Key Features:

• Free investor search filtered by stage, sector, and geography.

• Gmail connection to map shared network paths to investors.

• Community-updated investor profiles.

• Curated lists of investors by sector and stage.

Series B Offerings:

• Stage filter includes Series B, though coverage depth is strongest at pre-seed and seed.

• Network path mapping to identify warm introduction routes.

Pricing: Free.

Pros:

• Completely free with no paywall on core discovery features.

• Warm-path mapping through Gmail provides a meaningful head start on introductions.

• Clean interface that is fast to navigate.

• Broad coverage, 90,000+ VCs and angels included.

Cons:

• Community-maintained data means recency and accuracy vary, particularly for later-stage and institutional investors.

• No active-deployment signal layer; the platform reflects self-reported profiles, not confirmed deal activity.

• Coverage and interface are primarily optimized for pre-seed and seed founders.

• No pipeline management, outreach automation, or round strategy tools.

• NFX uses Signal as a top-of-funnel tool for its own deal sourcing, which means founders' data is visible to the platform operator.

5. Dealroom

Dealroom is a venture capital and startup ecosystem intelligence platform used primarily by institutional investors, corporate venture arms, and government economic agencies. It provides data on funding rounds, investor activity, and company profiles across global markets, with particularly strong coverage in Europe. For founders, Dealroom offers investor search filtered by stage, sector, and geography, as well as deal tracking and market mapping. Its pricing and primary user base position it as an institutional tool rather than a founder-side fundraising platform.

Key Features:

• Data on 4 million+ companies and investors globally.

• Deal sourcing, pipeline management, and portfolio monitoring tools.

• Market maps for visualizing startup ecosystems and investment networks.

• Integration with Salesforce, HubSpot, and other CRM platforms.

Series B Offerings:

• Stage and sector filters for investor search.

• Deal tracking to monitor recent funding activity.

• Strong European market coverage for founders raising in or targeting EU-based VCs.

Pricing: From €12,000/year (Starter), with Team and Corporate plans at €20,000 and €40,000/year respectively. Minimum 3 seats required.

Pros:

• Deep and regularly updated data on European VC activity, stronger than most US-centric platforms in this geography.

• Used by institutional investors, giving founders a shared information layer when pitching European funds.

• Market maps and ecosystem data provide useful context for Series B narratives about market positioning.

• Continuous data updates across millions of data points monthly.

Cons:

• Designed primarily for investors researching companies, not for founders running a raise.

• Enterprise pricing is prohibitive for most founding teams without institutional backing or advisor support.

• No warm-introduction mapping or relationship intelligence for founders.

• No fundraising pipeline management, outreach tools, or round strategy guidance.

• Minimum 3-seat requirement means individual founders cannot access paid tiers efficiently.

6. OpenVC

OpenVC is a free investor directory built specifically for founders, providing curated profiles of 5,000+ investors with publicly disclosed investment theses, check sizes, stage focus, and direct application links. Its core value proposition is transparency: founders can read what an investor actually looks for before making contact, without having to reverse-engineer it from portfolio data. OpenVC is most frequently recommended for pre-seed and seed founders, but its Series B investor profiles offer a useful starting point for initial thesis qualification before moving to more signal-rich platforms.

Key Features:

• 5,000+ active investor profiles with public theses, check sizes, and stage focus.

• Filtering by sector, geography, and stage.

• Direct application links for investors who accept inbound.

• Free with no paywall for founders.

Series B Offerings:

• Series B filter surfaces investors who self-report Series B focus.

• Public check size data helps founders qualify minimum investment thresholds.

• Investor application links reduce friction for inbound-friendly funds.

Pricing: Free.

Pros:

• Transparent thesis and check size data reduces early-stage misalignment.

• Completely free with no friction to access core discovery features.

• Built specifically for founders, not for investors or analysts.

• Regularly updated with verified investor profiles.

Cons:

• Self-reported profiles mean deployment status and recency are not confirmed.

• Smaller investor universe than PitchBook, Crunchbase, or Signal by NFX.

• No active-deployment signal layer to identify which investors are currently writing checks.

• No warm-introduction mapping or relationship intelligence.

• No pipeline management, outreach tools, or round strategy support.

• Optimized for early-stage founders; Series B-specific depth and signal quality is limited.

7. Affinity

Affinity is a relationship intelligence CRM built for VC and PE firms, used to manage deal flow, sourcing, portfolio tracking, and LP relationships. For founders, it sits in a different part of the fundraising stack: rather than helping you discover which investors to target, it helps you manage the relationships you are already working. Some founders with particularly large or complex networks use Affinity for relationship tracking during a raise, but its primary design is for investment teams on the other side of the table.

Key Features:

• Automated relationship intelligence via Gmail and calendar integration.

• Relationship strength scoring based on communication frequency, recency, and response rates.

• Deal pipeline tracking from sourcing through close.

• Integrations with LinkedIn, PitchBook, and Crunchbase for data enrichment.

Series B Offerings:

• Relationship scoring surfaces the strongest existing connections to specific investors or firms.

• Pipeline boards track investor conversations across stages.

• LP relationship management tools for funds managing complex investor bases.

Pricing: From approximately $2,000+/year, typically quoted on an enterprise basis.

Pros:

• Automated relationship intelligence removes manual CRM data entry.

• Relationship scoring is a genuine differentiator for managing a large, complex network.

• Integrates with PitchBook and Crunchbase for enriched investor profiles.

• Strong fit for founders with large team networks who need structured relationship visibility.

Cons:

• Designed primarily for VC and PE firms, not for founders running a raise.

• No investor discovery functionality, you need a separate platform to identify which investors to target.

• No active-deployment signal, thesis precision, or Series B coverage.

• No round strategy, outreach automation, or call preparation tools.

• Pricing and feature set reflect an enterprise investment-team buyer, not a startup founder.

Evaluation Rubric for Investor Intelligence Platforms at the Series B Stage

Series B founders should evaluate investor intelligence platforms against the following criteria, weighted to reflect the specific challenges of a later-stage raise.

Using this framework, Metal scores highest across all five criteria. PitchBook scores well on deployment signal and thesis precision but scores zero on warm-intro mapping and founder-side workflow integration. Signal by NFX and OpenVC score high on accessibility but low on deployment signal quality and Series B coverage depth. Dealroom performs well for European institutional coverage but is not designed for founders. Affinity has no investor discovery functionality and scores zero on deployment signal, thesis precision, and Series B coverage.

Why Metal Is the Best Platform for Finding Active Series B VCs

Every platform in this guide answers part of the question a Series B founder is asking. PitchBook tells you who has done Series B deals. Crunchbase gives you a fast, searchable starting point. Signal by NFX shows you who in your network knows a given investor. OpenVC surfaces transparent thesis data. Dealroom tracks European deal flow. Affinity manages the relationships you already have.

Metal is the only platform that answers the full question: which investors are most likely to back your specific company at Series B, who in your network can get you to them, and how do you run the raise from that intelligence through to close. Its Investor Patterns product uses 20+ filters and thesis analysis trained on proprietary data spanning thousands of venture investments. Its Content Signals product identifies investors who are currently active in and writing about your space, giving founders a real-time deployment proxy that no static dataset can replicate. Building Access maps warm-introduction paths through Gmail and LinkedIn so the insight becomes an action, not just a name. Pipeline Formation, Comms Automation, and Call Intelligence carry that precision forward through every stage of the raise.

For Series B founders managing a more complex raise, often alongside existing investors who have their own perspectives and networks, Autopilot provides AI-guided fundraising infrastructure spanning pitch decks, round strategy, investor calls, and leading indicators, trained on proprietary intelligence that generic AI tools do not have access to.

Techstars has adopted Metal as its default fundraising platform across a global portfolio of 10,000+ founders. More than 100 YC founders have used Metal for post-Demo Day fundraising. Metal is backed by Y Combinator. The platform has been validated at the highest levels of the early and growth-stage ecosystem because precision beats volume, and Metal is where that precision lives.

Start free or book a demo at metal.so. Raise Agent is included on the free plan, giving you immediate access to Metal's fundraising AI before committing to a paid plan.

FAQs About Finding Active Series B Investor Platforms in 2026

Which VCs are actively investing in Series B rounds right now?

Identifying VCs who are actively writing Series B checks requires more than a list of firms that have historically done Series B deals. Active deployment depends on fund cycle, LP capital availability, portfolio concentration, and partner bandwidth. Metal's Content Signals product surfaces investors who are currently active in and talking about a founder's space, while Investor Patterns uses thesis analysis across 1,000+ investments to surface the most likely backers for a specific company. This combination gives Series B founders a real-time signal layer that historical tools alone cannot provide.

What is the best investor platform for Series B fundraising?

The best platforms for Series B investor discovery in 2026 are Metal (for AI-driven, thesis-matched intelligence with warm-intro mapping and full raise management), PitchBook (for institutional-grade deal history and screener depth), and Crunchbase (for fast, broad initial research). Signal by NFX and OpenVC serve early-stage founders well but have limited signal quality at the Series B level. For founders who need to identify who is actively deploying capital, not just who has deployed in the past, Metal's active-signal layer is the most directly relevant tool in the market.

How can I tell if a VC is actively deploying capital before I pitch?

The clearest indicators that a VC is actively deploying capital include: verified deals closed in the last 90 to 180 days at your stage and sector; public statements or content from partners about their current thesis; new fund announcements or known fund-close dates; and hiring activity in investment roles. Metal's Content Signals product automates this qualification by surfacing investors who are currently active in a founder's specific space, saving hours of manual research per week based on qualitative founder feedback. Static tools require founders to triangulate these signals manually.

What is an intelligence view of Series B investors by check size and sector?

A Series B investor intelligence view by check size and sector typically requires combining multiple data sources: deal history from PitchBook or Crunchbase, self-reported check size data from platforms like OpenVC, and thesis analysis to confirm sector fit. Metal's Investor Patterns product consolidates this into a single AI-driven search with 20+ filters, including thesis analysis and portfolio pattern data, so founders can filter for investors who match on stage, sector, check size, and investment pattern without stitching together multiple tools.

Do I need a different investor platform for Series B than I used at Series A?

Series B raises differ from Series A in investor profile, check size expectations, diligence depth, and the role of existing investors in the process. Many institutional Series B investors, including growth-stage and crossover funds, do not appear prominently in early-stage discovery tools. For Series B founders, a platform that offers thesis analysis, active-deployment signals, and warm-intro mapping at the institutional investor level is essential. Metal serves founders from pre-seed through Series B and is specifically built to reflect the higher precision requirements of later-stage raises, including Autopilot for founders who need full end-to-end fundraising infrastructure at this stage.

How does Metal differ from PitchBook for Series B fundraising?

PitchBook is a data research tool used primarily by institutional investors, analysts, and professional researchers. It provides deep historical deal data and strong screener functionality, but it is not built for founders running a raise. It does not map warm-introduction paths, does not manage pipeline or outreach, and does not offer round strategy or call coaching. Metal is an AI-driven fundraising platform built exclusively for founders. While PitchBook shows you the data, Metal turns it into a targeted, workflow-integrated fundraising process, from identifying the most likely investors, to surfacing how to reach them, to managing every conversation through close.