Lockheed Martin Investment Management Co. boosted its holdings in Vanguard Long-Term Treasury Index ETF (NASDAQ:VGLT – Free Report) by 363.6% during the 4th quarter, according to its most recent disclosure with the SEC. The firm owned 510,000 shares of the company’s stock after buying an additional 400,000 shares during the period. Vanguard Long-Term Treasury Index […]