  We present a search for Trojan companions to 25 transiting exoplanets. We use
the technique of Ford & Gaudi 2006, in which a difference is sought between the
observed transit time and the transit time that is calculated by fitting a
two-body Keplerian orbit to the radial-velocity data. This technique is
sensitive to the imbalance of mass at the L4/L5 points of the planet-star
orbit. No companions were detected. The median 2$\sigma$ upper limit is 60
Earth masses, and the most constraining limit is 2.5 Earth masses for the case
of GJ 436.
