John De Mol has upped his stake in production company RDF Media from 27.25% to 29.26%.
The increase brings the Endemol founder within a whisker of the 29.99% limit where he would be required to make an offer to buy out other shareholders.
The move comes despite continued troubles for RDF over the Queen photoshoot scandal and a suspension of its commissions from ITV and the BBC.
"We still see RDF as a very good company," a source close to De Mol told the Media Guardian. "We noticed what happened over the past few weeks, but for us RDF is still okay. We are fine with our shareholding in it."
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