The H1 2026 Bridge Rounds and Extensions Report

Bridge rounds reached 16.6% of all venture capital raised on Carta in Q2 2025, up from 11.8% a year earlier, and were the single most common instrument at Series A. H1 2026 is the year the bridge stopped being a Plan B and became the default financing pattern between seed and Series A for everyone outside the AI hyperscalers.

Table of contents

• How common bridge rounds got in H1 2026
• The 2026 bridge round terms table
• Why bridges exploded: the seed-to-A gap
• Bridge vs extension vs seed round: the distinctions that matter
• Inside vs outside lead: the signal that changes everything
• Bridge vs flat or down priced round: how to decide
• What makes a 2026 bridge fundable
• The bridge round playbook for H2 2026
• FAQ

The thesis of this report is narrow and specific. Bridge rounds in 2026 are not a sign of weakness; they are a rational response to a 696-day median gap between primary rounds, and the founders who treat them as a planning tool rather than a panic move are the ones extending runway at last-round caps instead of accepting flat or down resets. Below is what the H1 2026 data says, what terms to expect, and the decision logic for whether you should be raising one right now.

How common bridge rounds got in H1 2026

Bridge rounds went from a fringe instrument to the dominant pattern in eighteen months. The numbers below are the load-bearing facts every founder weighing a bridge needs to see before they start the conversation with their existing lead.

In Q2 2025, 16.6% of all venture capital raised on Carta came from bridge rounds, up from 11.8% in Q2 2024 and roughly double the sub-10% baseline of the 2021 bull market. At Series A specifically, bridges were the most common instrument, accounting for 22.5% of all cash raised at that stage. Series D bridges also crossed 20% of stage cash, meaning the pattern reaches up the stack, not just at early stage.

The seed-stage picture is even more extreme. In Q1 2024, 42% of all seed-stage investments on Carta were bridge rounds, the highest seed bridge share Carta had recorded in any quarter that decade. That number has eased somewhat as the SAFE-funded seed has reasserted itself, but the structural story is intact: outside of fresh seed checks, the next dollar going into a seed-stage company is more likely to be a bridge than anything else.

The H1 2026 readout has not contradicted the trend. Silicon Valley Bank's H1 2026 State of the Markets observed "more companies turning to extension rounds to meet runway shortfalls", with the same report noting that only half of US VC-backed tech companies in 2025 were above their last private valuation. Soft pricing plus long primary-round gaps plus a hot top of market produces exactly this distribution: a handful of mega-rounds at the top, a long tail of bridges in the middle, and not much in between.

The screenshottable line: in H1 2026, if you are a non-AI seed or Series A company raising money, the modal financing event in your stage is a bridge, not a priced round.

The 2026 bridge round terms table

The terms below are the medians and bands you should expect from a 2026 bridge conversation. Insider-led rounds skew softer on price and harder on speed; new-money bridges flip both.

Two notes on this table. First, Carta's Q1 2025 pre-seed data shows SAFEs comprised a record 90% of pre-seed rounds, with the remaining 10% as convertible notes and a 7% median interest rate. That SAFE dominance applies to fresh pre-seed rounds, not bridges. Bridges trend back toward convertible notes because the interest accrual matters when you might be eighteen months from the conversion event.

Second, the cap-at-previous-post-money convention is the single most valuable mechanic of a 2026 bridge. Carta's Q4 2025 data shows median seed post-money valuations at $24M and Series A at $78.7M, with Series A up 37% year-over-year. If your last round was priced into the 2023-2024 trough, a bridge at the previous post-money cap is dramatically cheaper than re-pricing into today's higher primary-round market on conversion.

Why bridges exploded: the seed-to-A gap

Bridges are the symptom; the seed-to-A gap is the disease. Founders who understand the structural cause make better tactical decisions about timing and terms.

The single most important number for understanding 2026 bridge prevalence is the inter-round interval. Carta's Q2 2025 data shows the median interval between primary funding rounds reached 696 days, roughly 23 months, the longest Carta has measured and about three months longer than two years earlier. At seed, that means the runway you raised to last 18-24 months has to last 23+ months between primary events. Most companies do not hit a clean Series A milestone on a deterministic schedule. The bridge fills the delta.

The growth bar to clear is also higher. SVB's H1 2026 outlook states that "companies will typically grow revenue between 8-12x between seed and Series A". That is the revenue ramp that justifies the $78.7M median Series A post-money. If you are at $300k ARR at seed and your Series A targets are $3M+, the seed runway has to fund that climb, and most don't.

The cash side compounds the timing pressure. SVB reported an 8% year-over-year increase in burn rate at the median Series B company in H1 2025, with half of US VC-backed tech companies running out of cash within 12 months. The H1 2025 SVB framing of extensions as a "stopgap" has not aged out; it has hardened into the base rate.

The contrarian point worth holding onto: the long inter-round gap is not entirely macro. It is also a function of investor selectivity. Q1 2026 saw $267.2B in US VC deal value, the top single quarter outside full-year 2021 and 2025, with AI startups taking 42.5% of deal count and 51.7% of megadeals. The capital is there. It is just concentrating in fewer, larger checks at the top of the funnel, which means everyone else has to bridge to a sharper story.

Bridge vs extension vs seed extension: the distinctions that matter

The terms get used interchangeably and they should not be. A "bridge round" and an "extension" and a "seed extension" carry different signals to the cap table and different mechanical implications.

A bridge round is interim financing, typically a convertible instrument, between two priced rounds. It converts into the next priced round at the cap or with a discount. The intent is captured in the name: get from priced round N to priced round N+1.

An extension is a top-up to the existing priced round on the same documents and same terms. If you priced a Series A at $80M post a year ago, an extension is more shares sold at $80M post today. It does not require new lead terms or fresh diligence at the same depth. Extensions are friendlier to inside leads because the legal lift is minimal.

A seed extension sits in a grey zone. Sometimes it means a literal extension of the SAFE-funded seed (more SAFEs at the same cap). Sometimes it means a convertible bridge before the Series A. YC's official guidance is that SAFE-funded seed rounds "are really better considered as wholly separate financings, rather than bridges into later priced rounds", and their post-money SAFE Primer pushes founders to treat SAFEs as multi-year-runway seed rounds, not bridges.

The practical version of YC's point: if your seed was a SAFE round and you are now raising more SAFEs to extend runway, do not call it a bridge in your data room. Call it an extension of the seed financing, and only call it a bridge if it is a convertible note structured around the Series A. Investors read the wording. Loose vocabulary signals loose thinking.

The clean rule: if the conversion event you are bridging to is a specific upcoming priced round, you are raising a bridge. If the conversion event is "eventually, whenever we raise again," you are raising an extension of the seed.

Inside vs outside lead: the signal that changes everything

This is the section of the report most existing explainers gloss over. The identity of the lead investor on a bridge is the single most important signal the cap table reads.

An inside-led bridge means an existing investor wrote the lead check on the bridge, usually pro-rata or above. The signal to the rest of the cap table and to the next-round lead is: the people who know the company best, with the most information, chose to put more money in at terms close to last round's. That is the strongest possible reference call you can make on a Series A pitch.

An outside-led bridge means a new investor is leading the bridge. This is rarer and more loaded. It can be positive (a Series A fund pre-empting the round at a bridge price to lock allocation). It can be negative (existing investors passed, and new money is demanding a steep discount to compensate for taking the risk). The cap table interpretation depends entirely on the terms.

AngelList's framing is precise: bridge rounds are typically "led first by existing investors with new investors used to top up". The Q4 2025 PitchBook-NVCA Venture Monitor reinforces it: "insider-led" rounds were elevated as the dominant 2025 financing pattern keeping non-AI companies alive. If you are running a bridge process in H1 2026 and you cannot get an existing investor to lead, that is the diagnostic data point. Do not paper over it with new money on bad terms. Fix the inside-lead problem first.

In our reading of H1 2026 cap-table dynamics, the fundability of a bridge round is set in a single conversation with your largest existing investor; everything downstream of that call is execution.

The tactical implication: before you start telling anyone you are raising a bridge, have the inside-lead conversation with your largest existing backer. If they are in, the round is real. If they are out, you need to understand exactly why before you take the round to anyone else, because every new investor will ask, "why isn't [existing lead] doing this?" within the first ten minutes.

Bridge vs flat or down priced round: how to decide

The bridge question is a comparison question, not a stand-alone decision. The right comparison is bridge vs the flat-or-down priced round you would otherwise take. Once you frame it that way, the math gets clearer.

The 2026 market backdrop matters here. Cooley GO's Q1 2026 deal data shows 86% of priced financings were up rounds, 2.6% flat and 11.4% down , the first time up-rounds exceeded 80% since Q3 2022. Q4 2025 ran 79.5% up, 7.3% flat, 13.2% down. The up-round market is real and recovering. But it is recovering for companies that hit clean step-ups. If your metrics support a Cooley-style up round, take the up round. The bridge is not the question.

The bridge becomes the question when an up round is not yet defensible. PitchBook's H1 2024 data put flat and down rounds at a decade-high 28.4% of US VC-backed deals. That share has moderated into 2026 but it is still the realistic alternative outcome for any company with weak metrics. The question becomes: is your story going to be stronger in 9-15 months, by enough to clear a step-up at today's valuations?

The single most underrated argument for the bridge in 2026 is anti-dilution avoidance. Most seed and Series A preferred share classes have broad-based weighted-average anti-dilution. A formal down round triggers it. A bridge at the previous round's cap does not, because nothing has been re-priced yet at the time of the bridge. By the time conversion happens, you have ideally cleared a step-up, and the anti-dilution math is moot.

The contrarian read worth taking on this: the Cooley GO 86% up-round number is selection-biased. The companies running Cooley priced rounds in Q1 2026 are the ones who can hold valuations. The ones who cannot are doing bridges, which Cooley doesn't count as priced rounds. Both data points (86% up rounds on Cooley, 16.6% bridge share on Carta) are simultaneously true, and they are describing two different populations.

What makes a 2026 bridge fundable

The fundability of a bridge round comes down to four signals. If you cannot show all four, you are not raising a bridge; you are raising a rescue, and you should price that into how you negotiate.

• A specific re-rating milestone. "Get to $1.5M ARR by Q1 2027 so we can raise a clean Series A at $80M post" is fundable. "Extend runway" is not. The milestone has to be quantitative, time-bound, and connected to the metric the next round will be priced on.
• An inside lead willing to write a real check. Not a token follow-on. Real pro-rata or above from the largest existing institutional backer. The check size should be large enough that new investors read it as conviction, not insurance.
• A runway plan that gets you to the milestone with cushion. A bridge that gets you exactly to the milestone is not enough. You need 3-6 months past the milestone, so you raise the Series A from a position of optionality, not need. Most failed bridges fail because they were sized to a coin-flip outcome.
• A clean story about why the seed runway ran short. The next-round lead will ask. The honest answer is usually some combination of macro timing, a longer enterprise sales cycle than modeled, or a product pivot that paid off late. Pick the true story and rehearse it. "We extended through the macro trough" is fine. "We don't know" is not.

The negative space here is worth naming. None of the four signals is "we are running out of cash." Cash is a constraint, not a pitch. Every bridge has a runway story; the ones that get funded have a milestone story.

The bridge round playbook for H2 2026

The mechanical playbook below is what we would tell a founder asking us how to actually execute a 2026 bridge from start to close.

1. Run the inside-lead conversation first. Eight to twelve weeks before you run out of cash. One meeting, with your largest backer, framed as a planning conversation, not a fundraise. "Here is what we think we need to get to a clean Series A. Are you in for X?" Their answer determines the rest of the process.
2. Lock terms with the inside lead. Cap at last round's post-money, no discount or modest discount, 7% interest if notes, 18-24 month maturity, MFN. Get the term sheet on paper. The inside lead becomes the price-setter for everyone else.
3. Approach top-up investors with the inside lead already committed. New money joins on the same terms. The pitch is not "we're raising a bridge"; it's "[existing lead] is leading a bridge at [terms], we have allocation for $X." That sequencing typically yields a 2-3x higher close rate than approaching new money first.
4. Size to milestone + cushion, not to maximum check. Raising too much on bridge terms is the second most common mistake after raising too little. Every dollar of bridge converts into the next round at the cap, which becomes expensive if the cap is below market by the time you convert.
5. Pre-write the Series A pitch. The bridge milestone is the Series A story. By the time you close the bridge, you should already know which fifteen Series A funds you are pitching, what the deck will look like, and which two metrics they need to see move.

If you are running thirty or more investor conversations on a bridge, Causo automates the matching and personalization across that volume, which matters more for bridges than for primary rounds because the conversion windows are shorter and the inside-lead conversation has to come first.

The summary line: a 2026 bridge is a financing event that buys you nine to fifteen months of runway, no cap-table reset, and a clean priced-round shot, in exchange for a specific milestone you actually deliver. Treat it as a planning instrument and the math works. Treat it as a rescue and the cap table will read it that way.

FAQ

How common are bridge rounds in 2026? Bridge rounds reached 16.6% of all venture capital raised on Carta in Q2 2025, up from 11.8% a year earlier and roughly double the pre-2022 baseline. At Series A specifically, bridges were the single most common instrument at 22.5% of cash raised. H1 2026 is tracking similar levels as SVB confirms more companies pulling extension rounds for runway shortfalls.

What terms do bridge rounds have? Most 2026 bridges use a convertible note or post-money SAFE with the cap set at the previous round's post-money valuation, a 15-25% discount to the next priced round, MFN, and on notes a 7% median interest rate per Carta Q1 2025. Insider-led bridges often skip the discount entirely. New-money bridges usually demand both a cap and a discount.

When should you raise a bridge vs a priced round? Raise a bridge when you need 9-15 months of runway to hit a specific milestone (revenue multiple, design partner conversion, model performance) that re-rates the company. Raise a priced round when your metrics already support a clean step-up at current market multiples. With Cooley GO reporting 86% up-rounds in Q1 2026, a priced round is more defensible than it has been since 2022.

Do bridges signal trouble to investors? It depends on who leads and why. An insider-led bridge with new pro-rata participation and a clear milestone reads as conviction, not distress. A bridge after a failed priced round attempt, with no inside lead and a steep discount, signals trouble. AngelList notes the negative connotation is real but situational, with bridges equally common in IPO-prep and rapid-growth scenarios.

Related on the hub

• The VC fundraising process in 2026: inside the firm — Related vc process guide.
• Traction metrics for VCs in 2026: what IC memos screen for — Related traction metrics guide.
• The H1 2026 AI startup funding report — Related fundraising basics guide.