Each business day, TheStreet.com Ratings compiles a list of the top five stocks in five categories -- fast-growth, all-around value, large-cap, mid-cap and small-cap -- and publishes these lists in the Ratings section of our Web site.

For investors who prefer the diversification offered by mutual funds to owning individual stocks, here are some of the biggest holders of the companies that were on our list as of Thursday, Dec. 20.

Woodward Governor ( WGOV:

( GSVIX GE Institutional Small-Cap Equity allocated about 2.87% of its total portfolio as of Sept. 30, according to Thomson Financial.

( RYPRX Royce Premier allocated about 2.84% of its total portfolio as of Sept. 30, according to Thomson Financial.

Amphenol ( APH - Get Report):

The ( WPFRX Westport Fund allocated about 4.30% of its total portfolio as of Sept. 30, according to Thomson Financial.

( WAHGX Wasatch Heritage Growth allocated about 3.64% of its total portfolio as of Sept. 30, according to Thomson Financial.

Heico ( HEI:

( NBATX Neuberger Berman All Cap Growth allocated about 2.22% of its total portfolio as of Sept. 30, according to Thomson Financial.

( RSDGX RS Select Growth allocated about 2.05% of its total portfolio as of Sept. 30, according to Thomson Financial.

Flowserve ( FLS - Get Report):

( HSCSX Homestead Small Company Stock allocated about 7.17% of its total portfolio as of Sept. 30, according to Thomson Financial.

( CPEQX Cookson Pierce Core Equity allocated about 4.45% of its total portfolio as of Sept. 30, according to Thomson Financial.

Ametek ( AME - Get Report):

( STRGX Stratton Multi Cap allocated about 5.19% of its total portfolio as of Sept. 30, according to Thomson Financial.

( NMCGX Nationwide Mid Cap Growth Leaders allocated about 3.10% of its total portfolio as of July 31, according to Thomson Financial.

For a description of the top five mid-caps and an explanation of their ratings, click here.

This article was written by a staff member of TheStreet.com Ratings.