SoftBank says its loan-to-value ratio, a measure of net debt against the value of its holdings, could exceed its 25% limit as it commits another $30B to OpenAI (David Keohane/Financial Times)

David Keohane / Financial Times: SoftBank says its loan-to-value ratio, a measure of net debt against the value of its holdings, could exceed its 25% limit as it commits another $30B to OpenAI — Masayoshi Son faces investor nerves with massive spending on AI investments — SoftBank is testing a key self-imposed borrowing limit …