Tetra Tech, Inc.
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A consulting and engineering firm, Tetra Tech plans and builds water, environmental, and infrastructure projects worldwide — from flood control and water-quality systems to hazardous-waste cleanup and renewable energy. Four engineers founded it in Pasadena, California in 1966, and the Greek word "tetra" (four) honors both those four founders and their four original specialties: coastal engineering, research and development, geophysics, and systems analysis.
2.25% Convertible Senior Notes due 2028
No tracked superinvestor held this security as stock in this period — only the derivative positions below reference it.