South Korea's state-run pension fund wields a large influence over the country's major firms through its stockholdings, with stakes of over 5 percent in some 50 conglomerate affiliates, data showed Tuesday. The National Pension Service (NPS), the country's largest institutional investor, held a stake of over 5 percent in 55 affiliates of the country's top 10 conglomerates, or chaebol, as of Friday, according to the data compiled by Chaebul.com, which tracks the country's large family-controlled business groups. The top 10 groups have 94 listed firms on the Seoul bourse.