A brief look at the top institutional stockholders of the largest public companies in Massachusetts, ranked by market value, as of June 30 with the help of data from Bloomberg News.
6. Biogen Idec Inc.: The three largest stockholders of Biogen own more than a third of the company. Clearbridge Advisors became Biogen's largest shareholder during the second quarter. It bought 2.5 million share, for a total position of about 38.3 million shares that represents a 13.4 percent interest in the company. Fidelity Investments sold 4.1 million shares, reducing its holdings to 34.8 million shares or 12.1 percent. Primecap Management was Biogen's third largest investor, owning 31 million shares, or 10.8 percent of the company.
7. Staples Inc. The biggest Staples Inc. investors got even bigger in the second quarter. Fidelity Investments bought 10 million shares during the quarter. That gave Fidelity a total holding of 74.6 million shares, representing 10.4 percent ownership. Wellington Management, which bought 5.8 million shares during the quarter, owned 34.8 million shares or 4.9 percent of the company. Barclay's Global Investors added 5.3 million shares, for a total of 33.1 million or 4.6 percent. The quarter's biggest seller of Staples stock was TIAA-CREF Investment Management, which unloaded 4.5 million shares to trim its holdings to 6.9 million shares.
8. Genzyme Corp.: Clearbridge Advisors, the firm that became the largest Biogen shareholder, also became the top investor in Genzyme during the second quarter. Clearbridge added 1.8 million shares, for a total of 22.7 million or 8.6 percent of the company. Brinson Partners sold 5.2 million shares, cutting its stake to 17.1 million shares. Brinson was still Genzyme's second largest holder with its reduced 6.5 percent interest in the company. Sands Capital Management, a moderate seller of Genzyme stock during the second quarter, owned just under 13 million shares, or 4.9 percent.
9. American Tower Corp.: T. Rowe Price remained bullish on American Tower during the second quarter. It bought 6.2 million shares, for total holdings of 56.6 million shares or 13.8 percent of the company. Fidelity Investments sold 3.6 million shares, but remained American Tower's second-largest investor owning 31.6 million shares or 7.7 percent. Goldman Sachs Group owned 22.6 million shares, or 5.5 percent of the company, on June 30.
10. TJX Cos. Inc.: Pzena Asset Management, a long-time fan of TJX, became the company's largest investor during the second quarter. Pzena bought 4.2 million shares, bringing its holdings to 24.9 million shares or 5.5 percent of the company. Ruane Cunniff & Co. sold a small part of its position during the quarter, owning 24.7 million shares or 5.4 percent on June 30. Primecap Management owned 21.2 million or 4.47 percent on June 30. Two of the most active second-quarter traders of TJX shares, Fidelity Investments and Wellington Management, nearly cancelled each other out. Wellington bought 9.9 million shares, piling up a total position of 12.6 million shares at the end of the quarter. Fidelity sold 9.2 million shares, cutting its holdings to 11.3 million shares.