It was investigated if Herlin used inside information in his Kone and Partek stock Investments in 2001-2002. The investigation found Herlin innocent. Herlin started his own investigation into who is responsible for the case becoming public in the media in 2005. The authorities accused by him could not be proved to have given any information.
In 2005 the Herlin family made significant Investments in the construction companies YIT and Lemminkäinen.
Herlin received agricultural support from the state of €275,792 in 2012. State total support was €2.1 billion.