Morningstar research finds that 50 mutual funds have stakes in either the A class or B class of Facebook.

Among the largest holders are T. Rowe Price, Fidelity Investments and Morgan Stanley. Morgan Stanley also is the lead underwriter in the offering, which is expected to raise at least $5 billion and possibly as much as $10 billion.

The amount set out in the company’s filing of intent to offer shares said $5 billion, but that is not a fixed amount.

Among the funds with shares are T. Rowe Price Growth (PRGFX) and  Fidelity Contrafund (FCNTX).

Morgan Stanley “may see the biggest boost among the three because Facebook shares in its funds constitute the largest percentage of assets among the 50 offerings, around 3% or so,’’ Morningstart said.

Here’s the full Morningstar list.

Here’s the Facebook S-1 disclosure document.