Not even the King of Bonds could escape the carnage when Federal Reserve chairman Ben Bernanke intimated this spring that later this year the central bank would reduce its monthly purchases of U.S. Treasuries and mortgage securities, sending interest rates soaring. In the second quarter, a whopping $17.7 billion in net assets fled Pacific Investment Management Co.'s Core Plus — Total Return Full Authority strategy, managed by bond guru Bill Gross, according to Atlanta-based eVestment, which tracks data on 53,000 funds held by investors. The exodus reflects a broader shift in bond asset allocation as institutional investors search globally for yield.

With $476 billion in assets, the Pimco strategy combines core medium-term U.S. bond assets, such as Treasuries, with investment-grade, higher-yielding bonds that together raise the total return of the portfolio. The bulk of the assets reside in the $261.7 billion Total Return Fund, which Pimco co-founder and co-CIO Gross has run since 1987.

Pimco's huge net outflows from its Core Plus — Total Return strategy are due at least in part to rising interest rates, says Michael Rawson, a fund analyst at Chicago-based Morningstar who analyzes shifts in asset allocations. Indeed, rising interest rates prompted institutional investors around the world to cut back their exposure to fixed-income assets during the second quarter, as well as to reshuffle allocations among fixed-income classes.

Institutional investors withdrew a net $41.6 billion from fixed-income funds in the quarter ended June 30, according to eVestment. U.S. fixed-income assets alone experienced a net outflow of $43 billion. Those outflows stand in stark contrast to the previous five quarters, which saw a total net inflow of $445.5 billion into fixed-income funds.

Source: eVestment (Click image to enlarge)

During the second quarter, eVestment found that institutional investors increased allocations by $6.1 billion to fixed-income funds that invest globally. "More investors are making a choice to move away from traditional fixed-income products and more toward high-risk segments with more credit risk," such as emerging-market bonds and floating bank loans, explains Rawson. "An additional problem is that interest rates are relatively low, even though they have come up quite a bit." Growing fears of higher rates may drive investors to seek shorter-term fixed-income instruments that can roll over into higher rates later, Rawson adds.

Pimco benefited from the increased interest in fixed-income funds that invest globally. The firm saw a $5.47 billion net inflow into its Unconstrained Bond Fund, pushing its assets under management to $35.4 billion. In July, the fund was the most frequently searched strategy in the eVestment database, which portends well for future inflows.