& Research’s gave its stamp of approval to Ambac on Thursday, but the move was overshadowed by the revelation that JPMorgan Chase slashed its in the ailing bond insurer.

& Research, acts as an to ’s family of , and is Ambac’s largest shareholder. It disclosed in a filing that it raised its in Ambac to 11.8% from 3.4%. It now owns 34.2 million shares.

Investors didn’t seem to share Fidelity’s optimism. Ambac’s shares fell 6.7%, or 38 cents, to $5.27, at the close on Thursday.

Fidelity’s move came on the same day that JPMorgan Chase (nyse: JPM - news - people ) reported slashing its in Ambac to less than 1.0%, in a filing with the .

JPMorgan now owns about 1.4 million shares, or a 0.4% , in Ambac. It previously reported owning 7.8 million Ambac shares, representing a 7.7% .

JPMorgan and Fidelity reported their holdings via Schedule 13G filings, which indicate the investments are meant to be passive and that the shares weren’t acquired to influence control of the company.

On March 12, Ambac said that Moody’s Investors Service and Standard & Poor’s Ratings Services affirmed their triple-A ratings for its bond insurance arm after it raised $1.5 billion in capital a week earlier. That maneuver disappointed , which was expecting a bailout. (See “ Ambac’s Surprisingly Strong Day” and “ Ambac Gets Handout, Not Bailout”) Ambac was forced to increase its capital base to cover the rising likelihood of defaults mortgage-backed bonds, a result of the U.S. subprime mortgage crisis.

Two days later, Officer Michael Callen of Ambac told that his firm is in the “risk business” and is operating “in the most stressed credit environment that I can recall in my 40-year involvement with the financial marketplace.” Even so, Callen remained confident that Ambac will “weather the storm.” (See ” Ambac’s Alright — Just Ask Them”)

Piper Jaffray analyst Michael F. Grasher agrees with Callen — and, apparently, Fidelity — that bond insurers, including Ambac and MBIA (nyse: MBI - news - people ), are going to make a comeback. “In six months you’re going to have a different picture about the outlook,” Grasher said. “The valuation on Ambac is assuming a very worst-case scenario. The reality is that once we get through September/October we should know with greater certainty about ultimate losses. Because of that it certainly is time for investors to be taking a look.”

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