According to Barron's Dictionary of Finance and Investment Terms, a holding company is defined as a "corporation that owns enough voting stock in another corporation to influence its board of directors and therefore to control its policies and management. A holding company need not own a majority of the shares of its subsidiaries or be engaged in similar activities...."

By way of contrast, Barron's defines a parent company as a "company that owns or controls subsidiaries through the ownership of voting stock. A parent company is usually an operating company in its own right; where it has no business of its own, the term HOLDING COMPANY is preferred."

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Note added at 1 day6 hrs (2013-06-11 13:45:38 GMT)
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In other words, whether "parent company" or "holding company" is the most suitable answer depends, among other things, on whether the company in question engages in its own operations or whether its only function is to wield voting stock in another corporation and thereby influence its board and control its management. Which of those situations exists is a question best known to the translator who has access to the source text and therefore presumably also the necessary background information.