Two of the municipal market’s three busiest bond insurers yesterday inched closer to supporting the triple-A ratings their franchises depend upon, as one debuted a new capital plan and another saw its triple-A reaffirmed with a stable outlook.

Ambac Financial Group Inc., the parent of Ambac Assurance Corp., — the second-busiest insurer in the municipal market last year — announced a plan to raise at least $1 billion in capital and keep its triple-A rating, according to Securities and Exchange Commission filings.

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