GI Partners, a private equity firm based in Menlo Park, Calif., added AdvoServ to its holdings in 2009. Its website outlines an investment strategy that targets companies to "provide significant downside protection as well as the opportunity for significant value creation post-investment through strategic and operational improvement."

"GI Partners does not solicit or make its services generally available to the public," its website states.

Only a generic phone number and email is listed under a contact tab, and no minimum investment requirements are listed.

With $2.1 billion invested overall, GI Parnters lists AdvoServ as one of its North American holdings. Other companies in the portfolio include technology and real estate firms.

The GI Partners website describes AdvoServ as a private specialist healthcare services provider that operates group homes and related education programs for individuals with severe intellectual and developmental disabilities. Group homes are described as small residential centers that house six to 12.

AdvoServ operates more than 60 facilities across Delaware, New Jersey and Florida receiving millions in state and federal funds for students served there.

In Delaware alone, AdvoServ receives more than $300,000 a month – $3.6 million annually –to educate and house 17 students placed by a team of school district officials, parents and Department of Education officials.

Actual revenues could be higher depending on how many other state agencies place students in AdvoServ's Delaware facilities, but those figures were not readily available from the Department of Health and Social Services.

Calls to GI Partners Inc. were not returned.