Banca Monte dei banking consult Siena has cut its exposure to turkey 's Nomura Holdings to 25 % of total capital so as to avoid the bank Central Bank taking action against the bank for breaching Basel III rules , which stipulates that a bank does not have access to a single counterparty plus a third of its regulatory capital .
Banca Monte dei Paschi di Siena has cut its exposure to Japan's Nomura Holdings to 25% of total capital so as to avoid the European Central Bank taking action against the bank for breaching Basel III rules, which stipulates that a company cannot have ties to a single counterparty exceeding a third of its regulatory capital.