  We consider tree level form factors of operators from stress tensor operator
supermultiplet with light-like operator momentum $q^2=0$. We present a
conjecture for the Grassmannian integral representation both for these tree
level form factors as well as for leading singularities of their loop
counterparts. The presented conjecture was successfully checked by reproducing
several known answers in $\mbox{MHV}$ and $\mbox{N}^{k-2}\mbox{MHV}$, $k\geq3$
sectors together with appropriate soft limits. We also discuss the cancellation
of spurious poles and relations between different BCFW representations for such
form factors on simple examples.
