The challenge:
Pairing resilience with agility
Monzo launched its investment proposition in September 2023, giving its millions of customers the option to open investment accounts and access a range of multi-asset funds directly within their app. As well as a stocks and shares ISA and general investment account (GIA), Monzo also launched a pension tracing and consolidation service in July 2024.
To support its long-term ambitions, Monzo needed a modern and highly resilient investment infrastructure – one capable of scaling safely to meet rising demand while giving its teams the freedom to keep iterating at pace.
The team sought a partner that could:
- migrate several hundred thousand accounts without disruption
- support a fast-moving product roadmap
- underpin the experience with safe, stable, operationally robust technology
Above all, Monzo wanted to ensure customers continued to enjoy a fast and effortless investing experience, even as volumes grew dramatically.
investor and pension accounts migrated seamlessly
created and settled in under 15 minutes
auto-matched in three minutes
record handled without disruption
from first planning meeting to full migration
The solution: Part 1
A high-profile migration, executed seamlessly at speed and scale
Monzo selected Seccl as its new technology partner in January 2025. Following a smooth and successful technology integration, the first assets were placed on its new, Seccl-powered proposition in May.
By the beginning of July, all new Monzo investment accounts were powered by Seccl – with the full migration of existing client portfolios completed in September.
We now power its investment proposition end-to-end – acting as custodian, providing and administering its ISA and SIPP products, and managing its ever-growing pool of inbound transfers from other investment platforms. All while allowing them to retain full control of the customer experience, with a digital journey that’s fully native and lightning fast.
We completed the migration of more than 300,000 existing investment accounts with extraordinary speed and stability. Despite being the largest and most high-profile bulk migration we’ve undertaken, the project was completed in just five months. Our first joint planning session took place in April, with the full migration carried out in September.
During the migration:
- We processed around 20x our normal daily payments volume
- We auto-matched around 130,000 transactions in just three minutes
- Around 600,000 new transactions were created in Seccl’s system – all settling in under 15 minutes, with no breaks and a 99.98% automatch rate
In line with our mission to make money work for everyone, we’ve helped to demystify investing for thousands of customers, making it simple, transparent and affordable. Working with Seccl means we can go even further and introduce more exciting features and tools that help our customers grow their money, all within the Monzo app.
The solution: Part 2
An efficient, highly automated transfers operation
Monzo had built a substantial pipeline of customers ready to transfer their pensions. The success of the migration depended on working through this backlog quickly and efficiently, while continuing to support the steady flow of new transfer requests from a rapidly growing investor base.
To meet this demand with confidence, we made significant investment in our transfer infrastructure, ensuring both teams could rely on consistent performance as volumes scaled.
Within a few months, we delivered a series of high-impact enhancements to strengthen speed, visibility and control across the transfer journey. We:
- enabled manual transfers to be processed with the same speed and simplicity as electronic transfers, improving tracking and operational efficiency
- reduced rejection rates by proactively surfacing each ceding scheme’s requirements at the point of instruction
- introduced fast, low-friction resubmission journeys where additional information was needed
- automated transfer chasing, supported by clear operational dashboards for end-to-end oversight
In total, we planned and delivered nearly 20 big-ticket roadmap items in the first half of 2025, testament to the speed and agility of our product and engineering teams. Together, these improvements ensured Monzo customers experienced fast, reliable and transparent transfers throughout the migration and as volumes continued to grow.
The impact:
Faster transfers, faster feature development. Potential, unlocked.
For Monzo’s customers, the migration was seamless. For its product and engineering teams, it created immediate momentum – unlocking the ability to launch new features at pace.
Since partnering with Seccl, Monzo has introduced a fully digital accumulation SIPP, enabling customers not only to consolidate existing pensions but also to make new contributions. It has also expanded its investment offering to include ETF trading, strengthening its proposition for long-term investors.
Behind the scenes, Seccl’s pace of delivery – with code deployed more than 10 times a day – ensures Monzo can continue evolving its investment experience quickly and safely, with no trade-off between agility and resilience.
The partnership has also unlocked the full potential of Monzo’s transfer pipeline, giving customers the ability to move assets from other providers with exceptional speed and simplicity.
The results have been striking:
- in the six months between July 2025 and January 2026, monthly transfer volumes increased 15x – far exceeding Monzo’s already ambitious forecasts
- around 40,000 transfers were completed from migration through to the end of 2025
- average completion time fell to just 7.5 days, with one transfer completed in only 9 business hours, entirely without human intervention
- completion times have since reduced by a further 35 percent to 6.2 days – well below industry norms – even as volumes continued to rise
This is investment infrastructure built for speed, tested at scale and proven under pressure.
Monzo Transfer volumes and average days to process
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