Bellwether

Indikator

(anything that indicates future trends)

Indikator

(a stock or bond that is widely believed to be an indicator of the overall market's condition)

Leithammel

(the leading sheep of a flock, having a bell hung round its neck)

Trendbarometer

(anything that indicates future trends)

Trendsetter

(anything that indicates future trends)

Vorbote

(anything that indicates future trends)

führender Wert

(a stock or bond that is widely believed to be an indicator of the overall market's condition)