The Bridge Round Playbook
The only playbook written from the founder's side of the bridge — when existing investors go quiet, runway is shrinking, the market is not co-operating, and the next round is twelve months further out than last quarter's plan said. Ten assets covering thesis, instrument choice (equity, venture debt, IP-backed lending), runway math, board communication, and the pro-rata problem.
Bridge rounds get less written about than Series A and Series B for an obvious reason — the founders living through them are not writing publicly, and the funds running them prefer the closed-room narrative. The result is a content gap that lands on founders at exactly the moment they need structured advice the most. This hub closes the gap. It treats a bridge as the strategic instrument it actually is — a deliberate way to compound the metrics that justify the next round at a higher price — rather than the panic move it is often framed as.
Key Takeaway: A bridge is a sequencing decision, not a survival decision. Founders who treat it as the latter close on worse instruments at worse valuations. Founders who treat it as the former preserve the option value of the next round and arrive at it with the metric that justifies the price.
Who this hub is for
Founders at £1M-£15M ARR who need six to eighteen months of additional runway to reach the metrics that unlock a Series B (or, for earlier-stage operators, a Series A at the price they can defend). Equally relevant for CFOs deciding between equity, venture debt, IP-backed lending, structured bridges, and convertible instruments — and the trade-offs each carries into the next round.
The hub is also relevant for the existing-investor relationship management dimension that bridges surface. The board-communication and existing-vs-new clusters are written for the founder who needs to navigate the politics of the existing cap table without eroding either trust or option value.
What lives here — the architecture
A bridge round is a one-time event for most founders. The sequencing knowledge it requires has typically been acquired by the time it is no longer needed. The ten assets in this hub compress that learning curve. They cover the thesis (the 2-page memo that determines whether the bridge closes at all), the instrument decision tree (equity, venture debt, IP-backed lending, convertible, priced), the runway math (how to size correctly without over-raising or under-raising), and the relationship management (existing-investor sequencing, board communication, pro-rata politics, anti-dilution mechanics).
Read individually, each cluster addresses a specific failure mode. Read in sequence, they compose a structured 90-day bridge-arrangement plan that starts six to nine months before the runway cliff and ends with a closed bridge that preserves the option value of the next round.
Example: A B2B SaaS founder at £4M ARR has 11 months of runway. The Series B market for their sector is two quarters slower than expected. The choice is: raise a flat bridge from existing investors at the previous price; pursue a small new-lead bridge at a slight markup; layer £1.5M of IP-backed debt onto a £2M equity round to halve dilution. The clusters in this hub work each option with the maths.
The 10 assets
All ten clusters of the Bridge Rounds pillar, structured as one curated operating manual. The "Where it lives" column is the actionable destination.
| # | Asset | Where it lives | Why it matters |
|---|---|---|---|
| 1 | How to build a bridge-round thesis that closes | /bridge-rounds/thesis | The 2-page memo every successful bridge starts from. Without it, existing investors hesitate and new investors will not engage |
| 2 | Existing investors or new lead — who to talk to first | /bridge-rounds/existing-vs-new | Sequencing is signalling. The cluster covers when going to existing reads as confidence and when it reads as desperation |
| 3 | Convertible vs priced bridge — when each makes sense | /bridge-rounds/convertible-vs-priced | The instrument choice that determines how the bridge converts at next round. Maths-led, not preference-led |
| 4 | Venture debt in a bridge — when it reduces dilution | /bridge-rounds/venture-debt | When venture debt actually works, when it forces a sale, and how to read the covenants before signing |
| 5 | IP-backed lending as bridge capital | /bridge-rounds/ip-backed-lending | The non-dilutive UK alternative — NatWest, HSBC, BBB-backed — that can replace 30-50% of a bridge for IP-rich businesses |
| 6 | Flat, up, or down — the real bridge valuation mechanics | /bridge-rounds/flat-vs-down | Bridges price differently from primary rounds. The cluster covers the discounting mechanics and what the price signals to the next investor |
| 7 | The runway math that determines your bridge size | /bridge-rounds/runway-math | How to size the bridge correctly — not too small to reach the next milestone, not too large to be dilutive |
| 8 | Communicating a bridge to your board without panic | /bridge-rounds/board-communication | The memo template and the 30-minute board-meeting structure that reframes the bridge as planned sequencing |
| 9 | The pro-rata problem and how to solve it | /bridge-rounds/pro-rata-problem | When existing investors do not take their pro-rata, the signal is loud. The cluster covers how to manage the politics |
| 10 | Anti-dilution protection in bridge rounds | /bridge-rounds/anti-dilution | What founders miss about broad-based weighted average, narrow-based, and full ratchet — and how each plays out at next round |
The anchor asset
The Bridge Thesis Builder — the single artefact every successful bridge starts from. Free version produces a 1-page summary suitable for an existing-investor email and a board sub-committee briefing. The Growth tier in the Opagio platform unlocks the full 8-page memo with driver-level analysis (against the Opagio 12™), comp-set positioning, instrument-level recommendation, and a lender-ready appendix for IP-backed debt eligibility.
Until the dedicated tool is wired into the platform, the thesis cluster contains the structured framework — what each section covers, what evidence each section requires, and the failure modes that produce a thesis investors do not engage with.
Where to start — recommended reading order
If you have nine to twelve months of runway, start with the runway-math cluster to size correctly, then move to the thesis cluster to build the memo. Six months out, read the existing-vs-new cluster and the board-communication cluster in that order — sequencing is signalling. Three months out, the instrument-choice cluster and the anti-dilution cluster become the operative reading.
For UK founders with registered IP, read the IP-backed lending cluster early — at the runway-math stage. Layering £1-3M of IP-backed debt into the bridge can materially change the equity-side dilution and is worth scoping before the conversation with existing investors begins.
For investor-state context, see Bridge Round Strategy — Seven-Month Runway Playbook for the curated state-specific landing.
Build the bridge thesis
Two pages. Driver-level. The artefact that determines whether your bridge closes.