Flock is also reported to have expressed an interest in acquiring it.
Only one house that initially expressed interest in acquiring the book has pulled out, he said.
Iran has powerful reasons to want such weapons and even expressed interest in acquiring them a decade ago.
As early as 1940 the county expressed an interest in acquiring the remaining property.
Jim Walter said that other parties, which it declined to identify, had expressed interest in acquiring the company.
Praxis, which makes vaccines, said last week that one or more companies had expressed interest in acquiring it.
The company said it would hold discussions with those parties that have already expressed an interest in acquiring it.
She said 16 parties had made firm offers and eight others had expressed an interest in acquiring the publication.
Gtech acknowledged that "certain parties have expressed interest in possibly acquiring" the company, but said no offers had been received.
At least three television outlets, two over-the-air channels and one cable company, have expressed interest in acquiring rights to Nationals games.