In the latest sign of growing investor skepticism over their business model, Australian financial firms Macquarie Group Ltd. and Babcock & Brown Ltd. took steps Monday that could indicate a further retrenchment of their funds from public markets.

Under their complex model, known as the Macquarie model or the managed infrastructure model, the two companies manage funds that own cash-generating assets ranging from toll roads to airports to wind farms. The funds are debt-reliant and often publicly traded.

But the stumbling debt markets and concern about leverage have contributed to share-price declines for both the main companies and their managed ... [incomplete]

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