us The deficit at the federal agency that guarantees pensions for 44 million Americans tripled in the last six months to a record high, reaching $33.5 billion, largely as a result of surging bankruptcies among companies whose pensions it expects it will soon need to take over.

The agency, the Pension Benefit Guaranty Corporation, faced a shortfall of just $11 billion as of October. The combined effect of lower interest rates, losses on its investment portfolio and rising numbers of companies filing for bankruptcy produced the jump in its projected deficit, officials said Wednesday. Because the agency has $56 billion in assets — most of which is invested in Treasury bonds — it is not facing any prospect of default in the short term, officials said.