Every day, millions of naira move through Nigeria’s banking and financial system. Most of those transactions are ordinary: salaries are paid, businesses settle invoices, customers transfer money, and people pay for goods and services. But somewhere in that enormous flow, financial institutions are expected to spot transactions that do not look right.

In 2025, the Nigerian Financial Intelligence Unit received 42,082 Suspicious Transaction Reports (STRs) from reporting institutions, according to its annual report. The figure sounds enormous, but it was actually almost half the 82,143 reports received in 2024.

That does not mean suspicious financial activity in Nigeria fell by 48.8 percent. An STR is a report of activity considered suspicious by a reporting institution, not a confirmation that a crime has occurred. The decline could reflect changes in reporting patterns, compliance systems, risk assessments or the activity being detected.

What is clear, however, is where most of the reports came from.

Banks remain the first line of financial surveillance

Deposit money banks accounted for 38,715 STRs, or about 92 percent of all suspicious transaction reports received by the NFIU in 2025.

Their reporting also increased gradually through the year, from 9,134 reports in the first quarter to 10,032 in the fourth quarter.

Other financial institutions contributed 2,185 reports, while Designated Non-Financial Businesses and Professions accounted for 1,029. Capital market and insurance companies filed 104, while Virtual Asset Service Providers submitted just 49 STRs.

The figures put the role of banks into perspective. Although Nigeria’s financial ecosystem has expanded rapidly through fintechs, digital payments and other financial technology platforms, traditional banks remain the biggest source of suspicious transaction intelligence reaching the NFIU.

That intelligence matters because the NFIU is not simply a collection point for reports. Its job is to analyse financial information and turn it into intelligence that can support law enforcement, security and regulatory agencies. In 2025, the agency said it disseminated 2,033 reactive intelligence reports to support investigations. The system is much bigger than suspicious transaction reporting.

The NFIU received 41.7 million Currency Transaction Reports (CTRs) in 2025. Unlike STRs, these reports are generally triggered by transactions exceeding regulatory thresholds and do not necessarily suggest wrongdoing.

For financial institutions, the distinction is important. A large transaction is not automatically suspicious, while a suspicious transaction does not necessarily have to involve a large amount of money.

The money trail is getting more complicated

Nigeria’s financial system is also becoming more difficult to monitor as transactions move across banks, fintech platforms, digital assets and international markets.

The NFIU received only 49 STRs from Virtual Asset Service Providers in 2025, but that small number should not be interpreted as proof that digital assets pose little risk. It reflects the reports received from that particular category of reporting institution during the year.

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The agency has been paying greater attention to the sector as Nigeria’s financial ecosystem changes.

International transactions add another layer of complexity. The NFIU previously reported receiving 401 suspicious transaction reports worth more than ₦48 billion involving transactions linked to Dubai and Hong Kong between January 2021 and September 2024.

The figures illustrate why financial intelligence is increasingly about following money across multiple platforms and borders rather than simply watching what happens inside a bank account. For businesses, this also means compliance is becoming a bigger part of doing business.

Banks and other reporting institutions are expected to identify unusual activity, maintain appropriate records and report transactions that meet the relevant criteria. As financial services become faster and more digital, the ability to detect suspicious patterns increasingly depends on technology, data analysis and effective compliance systems.

The NFIU’s 2025 figures therefore tell a bigger story than the headline number suggests.

Nigeria’s financial system generated tens of millions of regulatory reports, while banks alone flagged more than 38,000 transactions for further scrutiny. The number of STRs fell sharply from the previous year, but the financial intelligence infrastructure around the country’s growing digital and traditional economy continues to expand.

The real question is not simply how many suspicious transactions are reported. It is whether the information being generated can be analysed quickly, shared effectively and ultimately used to stop financial crime before suspicious money becomes lost money.

Cynthia Nwanonyiri