OPDA member firms
Who OPDA actually is — the 13 firms that launched it in 2023, the wider association membership that has grown around it, and the seven firms who have achieved OPDA Technical Certification by evidencing PDTF implementation.
OPDA's 13 founding members (this page) are the proptech / lender / search-data firms that operationally launched OPDA in 2023. They are distinct from the 14 DPMSG founding members (the government + profession + finance coalition convened by HMLR in August 2023 — see the Steering & coordination page). DPMSG sets the strategic direction; OPDA members do the technical work.
The 13 founding members (launched OPDA in 2023)
Identified from the "Our Members → Founding Members" section of openpropdata.org.uk, cross-referenced against the May–Dec 2023 press posts on the OPDA blog announcing the formation. Each is mapped to its primary bounded context (one firm can touch multiple — primary is the dominant one).
| # | Firm | Primary bounded context | Sector / focus | Cert. |
|---|---|---|---|---|
| 1 | Moverly | Property Technology | Digital home-moving platform. Co-won the SDC Innovators prize with OPDA. | — |
| 2 | OnTheMarket | Estate Agency | UK property portal. | — |
| 3 | Sprift | Property Data Services | Property data aggregator. | ✓ |
| 4 | Coadjute | Property Technology | Decentralised property-transaction network. Spans all contexts as orchestration. | — |
| 5 | OMS (One Mortgage System) | Mortgage Lending | Mortgage-software platform. | — |
| 6 | Inventory Base | Property Data Services | Inventory + property-report platform. Also serves Lettings. | ✓ |
| 7 | United Trust Bank (UTB) | Mortgage Lending | Specialist lender — the founding lender. | ✓ |
| 8 | TM Group | Property Data Services | Conveyancing search provider. | — |
| 9 | PEXA | Property Technology | Digital property settlement network. Touches Conveyancing + Lending. | ✓ |
| 10 | LMS | Conveyancing (Legal) | Conveyancing services group. Secondary: Mortgage Lending services. | ✓ |
| 11 | Kotini | Property Data Services | Property data / packs platform. Also Property Technology. | ✓ |
| 12 | Groundsure | Property Data Services | Environmental + property search data. | ✓ |
| 13 | Homely | Estate Agency | Property platform / portal. | — |
✓ = holds OPDA Technical Certification.
Founder distribution across contexts
How the 13 founders spread across the six primary bounded contexts:
- Property Data Services — 5 firms (Sprift, Inventory Base, TM Group, Kotini, Groundsure)
- Property Technology — 3 firms (Moverly, Coadjute, PEXA)
- Estate Agency — 2 firms (OnTheMarket, Homely)
- Mortgage Lending — 2 firms (OMS, United Trust Bank)
- Conveyancing (Legal) — 1 firm (LMS)
- Surveying / Valuation — 0 founding members (the most under-represented context — RICS is on DPMSG but no surveyor was an OPDA founder)
The shape of the founding coalition explains a lot about what's well-covered in PDTF today (data services, listing data, lending integration) and where the gaps will need new members: surveying in particular, and letting-specific use cases.
The shape of the founding coalition
Technical Certification (as of May 2026)
Seven of the 13 founding members have evidenced PDTF implementation through OPDA's rigorous Technical Certification process. Per OPDA's own page, this certifies that the firm's systems, data policies, and working practices align with OPDA principles and enable interoperability across the property community.
- Kotini
- Groundsure
- Inventory Base
- PEXA
- LMS
- Sprift
- United Trust Bank
Association members (joined after launch)
Membership has grown materially since the 2023 launch. Association members identified from the same "Our Members" section, with press posts in our archive corroborating join dates where known.
Lenders / banks
- HSBC UK — joined Aug 2024 ("HSBC UK joins forces with OPDA")
- Nationwide Building Society — joined OPDA's campaign
- NatWest Group — joined the OPDA campaign
- Lloyds Banking Group — joined (includes Halifax + BM Solutions + Scottish Widows brand logos)
- Santander — author of the "Fixing the Broken Chain" paper in our archive
- Halifax / BM Solutions / Scottish Widows — Lloyds-group brands
Intermediaries and tech
- Mortgage Advice Bureau (MAB) — joined as the first intermediary network member
- Smoove
- Finova
- Phoebus
- HSP
- VMC
- Lenderhive
- Movera (formerly Mulberry)
- Movemnt — joined to streamline homebuying
- Experian
- Hometrack
- Connells Group — "Digital Sale Ready" pilot on propdata.org.uk
- L&C Mortgages
- Novus Strategy
- Armalytix
- Credas
- Clozy
- C2C
- Property Deals Insight
- e4 (UK)
Full logo wall at openpropdata.org.uk/our-members/.
WP custom post type — what's officially indexed
For reference: querying the OPDA WordPress REST API at
/wp-json/wp/v2/member returns only 4 member custom posts
with dedicated landing pages — Moverly, OnTheMarket, PEXA, and Sprift.
The other 9 founders + all association members appear as logos on the
/our-members/ page but don't have dedicated /member/<slug>/
URLs. This is a publishing decision (probably to feature key partners), not a
statement about membership status.
Implications for the linked-data project
Three things worth carrying forward from the membership map:
- Stakeholder engagement for the semantic-modelling work has natural starting points: the seven Technical Certification holders have already evidenced PDTF implementation, so they're the natural early reviewers for the ontology / data dictionary / SHACL shapes.
- Conformance scheme design (per ToIP Layer 4 governance) should build on what Technical Certification already does — re-framing it in the language of a ToIP-style Ecosystem Governance Framework + Trust Registry.
- Banking representation grew massively post-launch: HSBC, Nationwide, Lloyds (Halifax, Scottish Widows, BM Solutions), NatWest, Santander alongside the founding United Trust Bank — five of the UK's biggest mortgage lenders. This is the proof-point that the Open Banking analogy is operationally working: the same lenders that participated in Open Banking are joining its property-data analogue.