Armstrong Advisory Group Inc. boosted its holdings in Fiserv by 178.9% in the second quarter. Armstrong Advisory Group Inc. now owns 212 shares of the business services provider's stock valued at $37,000 after acquiring an additional 136 shares during the last quarter. Finally, Saudi Central Bank acquired a new stake in Fiserv during the 1st quarter valued at approximately $49,000. Institutional investors own 90.98% of the company's stock.