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Banks’ exposures through bond insurers, or monolines, is far from limited to mortgage-related MBS and muni bonds. There’s a third big exposure - to leveraged buyout loans - that banks will have to deal with if monolines hit the rocks.

Negative basis trades have been around for a while. A bank buys a bond - say it’s AAA - and then it takes out a CDS against that bond with a monoline. Since spreads in the CDS market for such tranches have been typically much lower than in the cash market, the bank pockets the difference.

But as well as banks’ much-dissected CDO exposures, there have been two other big markets for that kind of trade: on infrastructure bonds and - most interestingly - in structured finance, on CLOs (collateralised loan obligations) - CLOs being the vehicle of choice in which to park massive buyout loans.

Monolines, of course, are no longer in a position to be writing new contracts for banks to use as one half of their negative basis trades. The consequence of that has been that banks have stopped buying AAA tranches of CLOs. Unable to sell those, CLOs have faltered and banks in turn, have found themselves with lots of big buyout loans stuck on their books. No new financing is available for private equity deals.

According to Euroweek, 90 per cent of all CLO AAA-tranches have been bought and then wrapped in negative basis trades. Which begs a second question. What of all the AAA CLO and infrastructure paper that banks already have on their books? None of it, of course, shows up as exposures in filings because, net, there is no exposure. Assuming, of course, your CDS counterparty is safe. Err…

Even if monolines don’t crash and burn, banks will still have to make writedowns on these trades. As the value of the CDS written by the monoline decreases, so, too, will banks exposure to CLOs, and through them LBOs, have to increase. And higher exposures will also, of course, put pressure on capital.

And one final point: having set up one negative basis trade, it hasn’t been uncommon for banks to take out a CDS against the CDS counterparty in that trade. As Paul J Davies points out in today’s FT, through negative basis trades, banks’ monolines exposures have often been hedged with other monolines.

Update: The WSJ has an interesting number crunching piece on the state of the LBO industry - and the amounts banks are finding themselves stuck with.