United Kingdom · Payments & e-money
Nucleus365 Limited
KalpixPay Limited is a private limited company in London. The FCA authorises it as an authorised payment institution under firm reference number 925337. Companies House lists its co-founder Sophie Jane Flynn as holding 75% or more of its shares. It describes its offer as API-driven money remittance and deliverable FX for fintechs, marketplaces and corporate businesses, with multi-currency accounts delivered through partners. It traded as Nucleus365 Limited from January 2022 until it changed its name on 6 May 2026.
Licences and registrations
Held by Nucleus365 Limited (LEI 8755003IMU0JTXP11N70). 1 entry on 1 of the 22 tracked registers, retrieved 25 September 2026.
| Register | Licence | Number | Jurisdiction | Status | Registered | Ends | Activities | Register entry |
|---|---|---|---|---|---|---|---|---|
| FCA Financial Services Register - Payment Institutions & RAISPsFCALinked by LEI. Matched by Elucidate on the UK company number the register gives. | Authorised Payment InstitutionPayment InstitutionListed as Kalpixpay LimitedGLEIF legal name: Nucleus365 Limited | 925337 | United Kingdom | Active | 2021-09-30 | — |
|
Search the register ↗ |
The register name differs from the legal name in GLEIF. This can follow a rename. Treat the LEI match as indicative.
- Licences belong to the legal entity, not to a BIC.
- Each licence applies in the country of the regulator that granted it.
- Registers are tracked in 37 countries. Licences granted elsewhere are not recorded here.
- The register entries and their trading names were not matched against sanctions lists. The sanctions facts on this page cover the BIC and its LEI only.
Swift network
Swift’s ISO 9362 BIC directory
- BIC
- NUCEGB22XXX head office
- Connection to Swift
- Reverse billingThe institution is connected to Swift. Messages sent to it are billed to the institution, not to the sender. The “2” in the eighth character of NUCEGB22 marks reverse billing.
- Swift GPI
- Not on the member list
- Payment schemes and systems
- No entry in the EPC registers, the ECB T2 and TIPS lists or the SIX Bank Master cites this BIC
- Branch codes
- None: head-office BIC only
- BIC first registered
- 2025-01-04
- Last updated
- 2025-01-04
Overview
Researched 29 Sep 2026 · Sources
Customers
Not published
Ownership
Privately held
Firm type
FX and business payments
Trades as KalpixPay
- Standing
- The firm changed its name from Nucleus365 Limited to KalpixPay Limited on 6 May 2026. The Nucleus365 website now redirects visitors to kalpixpay.com. The Swift BIC directory and the GLEIF record still show the former name and the former address at 1 King William Street. The LEI registration has lapsed.
- Ownership
- Companies House lists Sophie Jane Flynn as the only person with significant control, holding 75% or more of the shares since 19 December 2022.
- Major shareholder
- Sophie Jane Flynn
- Head office
- Room 406, 16 Upper Woburn Place, WC1H 0AF London, United Kingdom
- Company register
- Companies House 12483487
- Incorporated
- 26 Feb 2020
- Founder
- Sophie Flynn
- Former names
- NUCLEUS365 LIMITED · REMIT OPT LTD
Online
- Websites & references
- kalpixpay.com ↗
nucleus365.io ↗ former domain (Nucleus365), now pointing visitors to kalpixpay.com - Official social accounts
- None found
Sources · 13 pages consulted
- find-and-update.company-information.service.gov.uk/company/12483487
- find-and-update.company-information.service.gov.uk/company/12483487/officers
- find-and-update.company-information.service.gov.uk/company/12483487/persons-with-significant-control
- find-and-update.company-information.service.gov.uk/company/12483487/filing-history
- find-and-update.company-information.service.gov.uk/company/12483487/filing-history/MzQ5ODkwMDYzNmFkaXF6a2N4/document?format=pdf&download=0
- register.fca.org.uk/servlet/servlet.FileDownload?file=015b0000006CXC7
- kalpixpay.com/
- nucleus365.io/
- nucleus365.io/terms-conditions
- nucleus365.io/contact-us
- nucleus365.io/news/welcome-to-nucleus-an-authorised-payment-institution
- finextra.com/pressarticle/97661/nucleus365-appoints-daniel-mayhew-as-ceo
- finextra.com/pressarticle/92970/payments-processing-startup-nucleus365-launches-to-market
Authorisation
Researched 29 Sep 2026 · Sources
- Operates under
- Its own licences
The FCA authorises the firm as an authorised payment institution under the Payment Services Regulations 2017, firm reference number 925337. The firm says its multi-currency accounts are delivered by partners but does not name them.
| Authority | Licence or registration | Number | Held | Status | Source |
|---|---|---|---|---|---|
| Financial Conduct Authority United Kingdom | Authorised Payment Institution | 925337 | In its own name | Active | register.fca.org.uk ↗ |
Licences and registrations the research found, at home and abroad, as the firm and its regulators publish them. The Licences and registrations card shows the entries on the registers the directory tracks.
Partners and safeguarding
Researched 29 Sep 2026 · Sources
- Safeguarding
- Not disclosedThe firm does not publish its safeguarding arrangements in the sources reviewed.
- Payment schemes and card networks
- Swift Access not stated nucleus365.io ↗
SEPA Access not stated nucleus365.io ↗
Faster Payments Access not stated nucleus365.io ↗
Banks and regulated firms the firm says hold its customers’ money, issue its cards, sponsor its accounts or settle its payments, as it discloses them in its terms and notices.
Products and markets
Researched 29 Sep 2026 · Sources
The firm describes its offer as corporate money remittance and deliverable FX in more than 140 currencies, plus treasury management. It also describes giving access to partner-delivered banking-as-a-service and multi-currency accounts.
The firm serves business customers from the UK under its FCA authorisation. It says its FX service covers more than 140 currencies.
- Sells to
- Platforms and marketplaces · Enterprises · Financial institutions
- Serves customers in
- United Kingdom
Leadership
Researched 29 Sep 2026 · Sources
- Executive
- Robert George Mennie Director
- Executive
- Stephen John Quinn Director
Recent events
Researched 29 Sep 2026 · Sources
-
Other
The firm changed its registered name from Nucleus365 Limited to KalpixPay Limited on 6 May 2026.
find-and-update.company-information.service.gov.uk ↗ -
Leadership
Amanda Louise Harrison resigned as a director on 5 May 2026, four months after her appointment.
find-and-update.company-information.service.gov.uk ↗ -
Leadership
Co-founder Sophie Jane Flynn resigned as a director on 2 April 2026. She remains the registered person with significant control.
find-and-update.company-information.service.gov.uk ↗ -
Leadership
The firm appointed Robert George Mennie, Stephen John Quinn and Amanda Louise Harrison as directors and moved its registered office to Upper Woburn Place.
find-and-update.company-information.service.gov.uk ↗ -
Other
The firm filed revised accounts for the year to 28 February 2025, stating that the opening balances were incorrect.
find-and-update.company-information.service.gov.uk ↗ -
Leadership
Craig James resigned as a director on 8 December 2025, having been appointed on 26 August 2025.
find-and-update.company-information.service.gov.uk ↗ -
Other
Companies House published a first gazette notice for compulsory strike-off and discontinued the action the following day.
find-and-update.company-information.service.gov.uk ↗ -
Leadership
Nucleus365 announced Daniel Mayhew, formerly of FIS Global, as its chief executive officer.
finextra.com ↗
Compliance-relevant events of the last three years, newest first: fines and enforcement, investigations, security incidents, licence changes, funding rounds, acquisitions and leadership changes. Each links to its source.
Identifiers
Head-office record
- BIC
- NUCEGB22XXX
- How the BIC breaks down
- NUCEBank
- GBCountry · United Kingdom
- 22Location · reverse billing
- XXXBranch · head office
- Branch description
- Not recorded in the directory
- LEI
- 8755003IMU0JTXP11N70
- LEI record
- View on GLEIF ↗
- Licence no. · FCA-PSD
- 925337
- How the LEI was matched
- BIC: Mapped to this BIC in the Swift and GLEIF BIC-to-LEI relationship file.Register entry: Matched by Elucidate on the UK company number the register gives.
- Register-entry ID
- 412911d5fdf2
Profile
- Type
- Payments & e-moneyPayment institutions, e-money and stored-value issuers, and account-information providers. Licensed under payment-services law (e.g. PSD2 in the EU and UK, the Payment Services Act in Singapore). Taken from the licences on the tracked registers.
- Regulation
- Prudential licenceAuthorised with capital, safeguarding and conduct requirements, e.g. an authorised payment or e-money institution in the EU or UK, a major payment institution in Singapore, or a MiCA crypto-asset service provider.
- Register licences
- 1 entry on 1 register
- Activities
- Payment services
- Licensed in
- United Kingdom
- Website (register)
- kalpixpay.com ↗
- Country · region
- United Kingdom · Europe & Central Asia
- Trading venues (MIC)
- No MIC registered under this LEI list of 2026-09-17
- OFAC sanctions
- No listing cites this BIC
- EU sanctions
- No listing matched this BIC or its LEI
- Country sanctions
- No country programme
Types come from Swift’s BIC classification, the licences on the 22 tracked registers, and the ECB and FSB bank lists. Most banks outside the euro area appear as financial institutions, because their supervisors’ registers are not tracked yet.
Ownership and group
GLEIF relationship records
GLEIF’s relationship records name no parent for this LEI, and no group page is published for it.
Addresses
- Registered address
- 1 KING WILLIAM STREET LONDON EC4N 7AF UNITED KINGDOM
- Operational address
- 1 KING WILLIAM STREET LONDON LONDON EC4N 7AF UNITED KINGDOM
ISO 20022 identification
As an agent in a Swift cross-border payment message (CBPR+)
A CBPR+ message identifies this institution by its BIC, and may add its LEI or a clearing code. CBPR+ does not allow a name and postal address next to a BIC.
- Identified by
- BIC, with its LEI
- Roles in CBPR+
- Any agent, including the instructing and instructed agents
CBPR+
For cross-border payments on Swift: the BIC, with the LEI and clearing code where known
<FinInstnId>
<BICFI>NUCEGB22XXX</BICFI>
<LEI>8755003IMU0JTXP11N70</LEI>
</FinInstnId>Full record
Every ISO 20022 element the directory holds. Base ISO 20022 allows them together. CBPR+ does not allow a name and address next to a BIC
<FinInstnId>
<BICFI>NUCEGB22XXX</BICFI>
<LEI>8755003IMU0JTXP11N70</LEI>
<Nm>NUCLEUS365 LIMITED</Nm>
<PstlAdr>
<TwnNm>LONDON</TwnNm>
<Ctry>GB</Ctry>
<AdrLine>1 KING WILLIAM STREET LONDON EC4N 7AF</AdrLine>
</PstlAdr>
</FinInstnId>The BIC, name and address are as published in Swift’s BIC directory. The LEI comes from the Swift and GLEIF BIC-to-LEI file. Check them against your own records before use.
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Sources & method
Every value comes from a public source, such as Swift’s ISO 9362 BIC directory, GLEIF or the OFAC and EU sanctions lists. Most sources are matched on a BIC or an LEI, not on a name.
Swift GPI membership is matched on names and is indicative. A missing sanctions match does not mean that no listing applies. Always screen against the official lists.
Register entries are not screened against sanctions lists. The sanctions facts on this page cover the BIC and its LEI only.
An institution is one entry in the directory: a BIC8 in Swift’s directory, or a firm on a tracked register that holds no BIC. Licences held by an institution with a BIC are shown on its page.
Read the methodology →Credits for this page
- FCA Financial Services Register - Payment Institutions & RAISPs—Financial Conduct Authority (FCA) · register ↗ as at 25 September 2026
- Overview, authorisation, partners, products, leadership and events—researched per institution by an AI model with web search, from the firm's own website, terms and filings, regulators' registers and notices, company registers and news. Licences, partners, figures, people and events link to their source, and each card shows the research date. AI research can be wrong or out of date, so check key facts at the source.
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