Charles Schwab Reduces Holdings in MGIC Investment Charles Schwab Investment Management has trimmed its stake in MGIC Investment Co., selling 45,444 shares during Q4. The fund now holds 2,579,328 shares, valued at $61.16 million. This represents a 1.7% decrease in ownership. Institutional investors continue to dominate MGIC’s shareholder base, owning 95.58% of the company.12