NTT Docomo has become the second-biggest stakeholder in South Korean operator KT Corp., with a 5.46 percent stake. Docomo has swapped exchangeable bonds of KT for American depositary receipts to make them count toward its stake in KT. Separately, KT said Docomo’s move will reduce KT’s debt by about KRW344.4 billion (US$297 million), and help it improve its financial standing.