The phrase "whose holding" is grammatically correct and is commonly used in written English.
Example: The company, whose holding in the market increased significantly last quarter, reported record profits.
Vladimir Gusinsky, whose holding company owns a vigorously anti-Putin television channel, NTV, is under regular police interrogation, partly over taxes.
Among the largest contributors was Dallas businessman Harold Simmons, who gave the group $5m in November and whose holding company, Contran Corp, donated an additional $2m.
The company is controlled by Mr. Wygod, whose holding company, the HLTH Corporation, owns almost all of WebMD's Class B voting shares.
Warren E. Buffett, whose holding company Berkshire Hathaway is one of Goldman's largest shareholders, says he fully supports the work of the Goldman charities, but is troubled by the principle of large-scale corporate philanthropy.
The Diacks and the businessman, Arthur Cesar de Menezes Soares Filho, whose holding company made the payments, have been accused of corrupting the voting process that took the Olympics to South America for the first time.
Johan Bruyneel, whose holding company owns the team, was selected by Armstrong to direct the United States Postal Service team when Armstrong made his return to racing in 1999 after his cancer treatment.
Meeting halls are adorned with black-and-white pictures of party leaders, men whose hold on Congress was once indisputable.
Öcalan is a tyrannical leader whose hold over his followers is hard for outsiders, including myself, to comprehend.
What happens in Cairo is being meticulously scrutinised in neighbouring states with leaders whose hold on power might be as brittle as Mr Mubarak's.
This was when he was lieutenant governor and the top man was Eliot Spitzer, the self-proclaimed steamroller, whose hold on power seemed as secure at the time as an investment with the Madoffs.
To start, the most timid members of Congress are generally those whose hold on office is the most tenuous.
