  We incorporate all gauge-invariant local composite operators into the
twistor-space formulation of N=4 SYM theory, detailing and expanding on ideas
we presented recently in arXiv:1603.04471. The vertices for these operators
contain infinitely many terms and we show how they can be constructed by taking
suitable derivatives of a light-like Wilson loop in twistor space and shrinking
it down to a point. In particular, these vertices directly yield the tree-level
MHV super form factors of all composite operators in N=4 SYM theory.
