Institutional Ownership in Teradyne, Inc. Sees Significant Shift Teradyne, Inc. (LSE:0LEF) has observed a 6.57% rise in institutional shares this quarter, totaling over 200 million. The stock price, however, declined 16.15% year-over-year, now at $91.03. Vanguard and BlackRock remain among the top shareholders, reflecting continued major institutional interest.2