The billionaires behind toymaker Lego A/S are seeking greater control of ISS A/S, after shares in the Danish office services firm went into a free fall.

ISS sank 16% at one point on Wednesday, after delivering yet another disappointing set of earnings. With the latest sell-off, ISS has lost over a third of its market value in the past year.

For Kirkbi, which oversees $16 billion of Lego wealth for the Kirk Kristiansen family, the 12-month drop represents a loss of about $300 million on its 15% stake.

On Wednesday, ISS said Soren Thorup Sorensen, the chief executive of Kirkbi, has been nominated to join its board, with a vote due to take place at the annual general meeting in April.

In an emailed reply to questions, Sorensen said he’s joining the board to support the company and that Kirkbi is a long-term investor.

“Board representation is a natural part of our investment strategy and the desire to be close to the companies where we have a significant minority share,” Sorensen said. He declined to comment on Wednesday’s report or on the share price development.

ISS shares are now trading at a record low, and short interest in the company is at around 7.7% of the share capital, according to data compiled by IHS Markit. One ISS share cost as little as 124.55 kroner on Wednesday, compared with 160 at its initial public offering in 2014.

Jeff Gravenhorst, the CEO of ISS, said that Kirkbi “is a big supporter” of the company and that Sorensen knows ISS “very well.”

“I have a super relationship with him and he is a capacity to get on board,” Gravenhorst said in a phone interview. “We are going through a transformation and Kirkbi know that they are a part of this journey.”

This article was provided by Bloomberg News.