Company Pension Funds Stuffed With Bonds Ease Up on Debt Buying

A key source of demand for corporate bonds may be fading now that managers of company pension funds have more than enough money on hand to pay their retirees.

Company-sponsored plans that had struggled in past years to keep up with their obligations in an era of low interest rates have gotten a boost from a decade of strong equity returns. Many plowed those gains into bonds in more recent years as yields rose. The trade allowed managers to lock in funding for retirees and cut risk at the same time.

Now they’ve lowered risk enough that they have less ...