Bridge Round Funding Is More Common Than Ever - And More Dangerous Than You Think

The Numbers That Should Change How You Think About Bridges

Bridge round funding used to be a signal that something had gone wrong. Now it is just part of the journey - at least that is what founders tell themselves.

Here is what the data says.

In one recent quarter, 42% of all seed-stage investments on Carta were bridge rounds - the highest rate of the decade. At Series A, the rate hit 43%. For the full year, 40% of all seed-stage rounds were bridges, up from 36% the prior year.

These are not small companies quietly limping along. Bridge rounds are now a dominant feature of the startup funding machine. But taking one does not improve your odds. It cuts them roughly in half.

Companies that take a bridge round are half as likely to reach the next milestone.

What Is Bridge Round Funding

A bridge round is any funding round raised after the first round in a given series. If you raised a Seed, then raised more money before your Series A, that second raise is a bridge.

Bridge rounds are usually smaller than primary rounds. They often involve the same investors who wrote you a check the first time. They are designed to extend your runway - to get you from where you are to where you need to be to raise the next primary round.

The word bridge is literal. It is a financial bridge between two bigger moments.

In practice, I see bridges fall into one of three forms.

Convertible notes are the most common structure. They are short-term loans that convert to equity at the next primary round. The key terms are the discount rate (typically 15% to 30%, with the median near 20%) and the valuation cap, which sets the maximum valuation at which the note converts. Interest rates on convertible notes typically run 5% to 8% per year.

SAFEs (Simple Agreements for Future Equity) work similarly but without the interest or maturity date. They are faster to close and simpler to document. A SAFE might also include a discount rate or valuation cap.

Priced equity bridges are less common but happen - especially at later stages or when a company has negotiating power. They require setting a valuation, which is exactly what most founders in bridge situations want to avoid.

One structural nuance worth understanding: bridge rounds often include both a discount and a cap, and the investor gets whichever conversion mechanism gives them the better price. That detail can matter a lot at later-stage bridges where valuations have moved significantly.

Why Bridge Rounds Are Everywhere Right Now

Bridge round funding has a structural cause.

Annual IPO counts fell 62% from their peak to the most recent full-year data, while new venture rounds declined 36% over the same period. When exits slow down, VC funds cannot return capital to their LPs. When LPs are not getting returns, they slow new commitments. That tightens capital at the growth stages. Which pushes more companies into bridge situations at the early stages.

As one early-stage VC put it: the rise of bridge rounds over the last several years ultimately stems from reduced exit activity. IPOs have become scarcer, and the trickle-down effect has been tighter capital at the growth stages for most companies.

Meanwhile, the bar for Series A has moved. The old threshold of $1M ARR that used to unlock Series A is now table stakes. I see this consistently - Series A rounds today requiring $2M to $5M ARR just to be considered, with 25% or more month-over-month growth expected as a baseline.

And the time between primary rounds has stretched dramatically. The median interval between primary funding rounds hit 696 days - roughly 23 months - in a recent quarter. Two years earlier, the median was about 600 days. Seed rounds are almost always sized for 18 months of runway. The math does not work. Seed rounds cover 18 months. Series A now demands metrics that take 24 or more to build. Bridges fill that span.

More than 1,000 startups per year are now effectively stranded between seed and Series A - with no clear path to the next round. The ratio of seed deals to Series A deals has expanded significantly over the past decade, and most of those seed companies will never make it upward.

The Graduation Rate Problem

Here is the data that should be on every founder's whiteboard before they decide to raise a bridge.

Carta tracked what happened to companies from the same seed cohort - those that did and did not raise a bridge round - and measured how many eventually graduated to Series A.

Companies that did not need a bridge: graduation rates ranged from 21% to 29%.

Companies that took a bridge: graduation rates collapsed to between 7% and 14%.

That is at least a 50% drop in the probability of making it to the next round. If you need a bridge, you are statistically twice as likely to fail as a peer who does not.

The context makes this worse. Only 15.4% of startups that raised seed in early cohorts managed to raise a Series A within two years - compared to 30.6% for the same milestone in older cohorts. Historical cohorts from stronger markets saw 40% to 50% of seed companies reach Series A within two years. Recent cohorts managed just 20% overall when measured over a longer window.

For every five startups that raise a seed round right now, roughly four will never make it to Series A. A bridge round is correlated with worse odds.

Why? A bridge round sends a signal to the market. When you ask for a bridge, you are telling the market that you missed your milestones in the standard timeframe. A bridge round often creates cap table complexity, valuation overhangs, and additional dilution on top of what you already gave away. A standard seed round costs around 20% dilution. Add a bridge and you are often looking at another 8% to 9%. That is close to 30% gone before you have raised a Series A dollar.

The Two Types of Bridge Rounds - and Why They Have Different Outcomes

Bridge rounds come in fundamentally different forms. The data on graduation rates describes companies that needed a bridge because their metrics were not strong enough to raise a primary round. That is the most common scenario. But it is not the only one.

There are also strategic bridges - companies that raise interim capital because conditions are bad, not because their business is. These companies often have strong traction but face a market where even good companies cannot close a clean primary round.

Robinhood raised a $1 billion bridge round before its IPO six months later. It was a timing instrument.

Hadean, a UK defense AI company, raised approximately $15 million in bridge funding ahead of a roughly $100 million Series B. The bridge was used for what the company called secondary clean up - tightening the cap table before a big primary round. In a hot sector with strong momentum, a bridge can serve as a proof-of-commitment signal before a much larger close.

Terra Industries, an Africa-focused agribusiness, raised a $22 million bridge post-seed from a group of high-profile angels, bringing their total to $34 million. That bridge built momentum capital - the kind that validates a story before a formal Series A process begins.

Strategic bridges and distress bridges change the terms you will get, the investors who will participate, and the probability of what comes next.

One practitioner who documented a distress bridge they had to take noted that the deal required forgoing a full year of salary as part of the terms. The cash was not free. It came with personal sacrifice and significant structural concessions. That is the reality of a weak-position bridge.

What Investors Think About Bridge Rounds

The conventional wisdom is that the stigma around bridge rounds has faded. That's conditionally true.

One early-stage VC noted that the old stigma around bridge rounds making it harder to raise subsequent rounds has lessened. If a company has strong traction, investors will be interested regardless of whether it took a bridge round to get there.

The operative phrase is strong traction. The stigma has not disappeared - it has become conditional. A bridge round in a company with a clear, measurable milestone in front of it is fine. A bridge round in a company still searching for product-market fit will spook investors.

On valuation during a bridge, one legal practitioner who works with startups on fundraising was direct: valuations in bridge rounds are not going up. It is more likely to be flat. Existing investors are not there to negotiate a higher valuation. They are there to keep the company alive. That changes the dynamic.

Another VC made the longer-term point clearly: the bridge round surge is temporary - tied to exit market conditions, not a new normal. When exits reopen, primary rounds will dominate again. Companies eventually need to go up for VCs to make money. The DPI reality does not change.

The Seed Extension Naming Game

One thing the data cannot fully capture is how much labeling is obscuring the picture.

Many bridge rounds now travel as seed extensions, pre-A rounds, or seed+ financings. It is interim capital between a primary seed and a primary Series A, relabeled to reduce perceived stigma for founders and make the ask to investors feel more routine.

Carta is explicit about this: a bridge round is any round raised after the first round in a given series. Whether it is called a bridge, an extension, or a seed+, the structural and statistical reality is the same.

This matters because founders sometimes convince themselves that raising a seed extension is categorically different from raising a bridge. The graduation rate data does not make that distinction.

The AI Distortion and the Two-Track Market

I see this constantly - the concentration of capital in AI reshaping the bridge conversation for founders across the board.

At later stages, roughly 50% of every dollar invested in Series D and Series E companies is going to AI companies. At seed and Series A combined, AI companies represent about 30% to 35% of all capital deployed. The result is a two-track market: AI companies are often raising primary rounds on strong terms while non-AI companies face the toughest bridge environment in a decade.

If you are building outside of AI, you are swimming against the current. Capital is concentrated in AI right now, and that shapes every bridge conversation you will have.

One Hartmann Capital partner noted: the bridge round surge is not becoming an industry standard for a simple reason. Companies need to go up for VCs to make money. Eventually, they need DPI. But when that correction happens is the question founders need to plan around - not assume away.

How to Run a Bridge Round That Works

If you are going to raise bridge round funding, there are a set of conditions that separate bridges that lead somewhere from bridges that stall.

Bridge to a defined milestone, not a mood. A bridge to find product-market fit is a bet. A bridge to close a signed $500K contract that is in final negotiation is an investment. The milestone needs to be concrete, measurable, and achievable within the runway the bridge buys. Investors know the difference.

Close quickly or not at all. Convertible notes can close in two to four weeks. A full priced round takes three to six months. If you are doing a bridge, use the speed advantage. A bridge that takes three months to close while your business stalls is not a bridge - it is a distraction.

Start with your existing investors. In my experience, insiders - investors who already own a stake in the company - are the ones who show up for bridge rounds. They have the strongest incentive to see you get to the next milestone. Starting with them is faster, cheaper on legal fees, and cleaner. A bridge that requires new investors to lead is a much harder raise.

Watch the dilution math before you sign. The combination of a primary seed (20% dilution) plus a bridge (8% to 9%) leaves you close to 30% diluted before you have raised a dollar at Series A. Model the full cap table impact before you accept terms, not after.

If the valuation is the problem, fix the valuation. A bridge round is sometimes chosen because founders do not want to take a down round. But a clean down round is painful once. A bridge with a messy structure tied to an inflated valuation is a recurring problem. If the blocker to your next primary round is your post-money valuation from the last round, the bridge will not fix that - it will delay the reckoning.

What Investors Are Looking For in a Bridge Ask

When a founder approaches existing investors for a bridge, the investors are running a quick mental model: does this company still have a path, and does this bridge get them there?

The ask should answer those two questions directly, with numbers. What is the specific milestone? How much runway does the bridge buy? What changes when you hit that milestone that makes a primary Series A viable?

A strong bridge pitch looks like this: we have a $600K ARR run rate, three enterprise pilots in close, and one signed LOI. A $1.5M bridge gets us to $1.2M ARR and a signed second customer, which is exactly the proof point a target fund told us they need to lead a Series A.

The weaker the underlying business position, the more specific the milestone needs to be. Investors are funding a specific delta between where you are and where the next round becomes fundable.

If you need to run outreach beyond your existing cap table - whether that means approaching angels, family offices, or new early-stage funds - knowing who is actively writing checks into companies at your stage and sector matters. Try ScraperCity free to search millions of contacts by title, industry, and company size, which is useful when you are trying to reach managing partners or principals at funds that invest in your category.

The Bottom Line on Bridge Round Funding

Bridge rounds are a financial tool. Like any tool, they work well in the right situation and cause damage in the wrong one.

The data from Carta is direct: companies that took a bridge had Series A graduation rates of 7% to 14%. Companies that did not need a bridge graduated at 21% to 29%. That is at least a 50% drop.

When you cannot raise a clean primary round, investors are sending you a signal. The bridge gives you more time to respond to that signal. Whether you use that time well is what determines the outcome.

Set a specific milestone and close fast. Dilution will compound faster than you expect. And if your valuation is the problem, solve that problem directly rather than papering over it with a convertible note.

The founders who raise a bridge and get to Series A are the ones who treated the bridge as a correction - not a continuation.