  Form factors are important ingredients to investigate the principle of
maximal transcendentality (PMT) and to extract anomalous dimensions of local
gauge invariant operators. In this article, we compute several two- and
three-point FFs to three- and two-loops, respectively, for three different
choices of local gauge invariant operators in ${\cal N}=4$ super Yang-Mills
(SYM) theory. The operators ${\cal O}^1$ and ${\cal O}^2$ are flavour and
helicity blind configurations of supersymmetric descendant of the half-BPS and
Konishi primary, respectively, and ${\cal O}^3$ is the energy-momentum tensor.
The operators ${\cal O}^1$ and ${\cal O}^2$ are composed of non-protected
dimension-three (classical) fermionic and scalar components belonging to
SU($2|3$) closed sub-sector of ${\cal N}=4$ SYM. We analyse the mixing among
the non-protected fermionic and scalar components of these operators up to
three-loops in perturbation theory and consequently, compute the quantum
corrections to the corresponding dilatation operators. The highest
transcendental (HT) weight terms of the FFs of ${\cal O}^1$ are found to be
independent of the external on-shell states and, moreover, those are equal to
that of half-BPS, however, this does not hold true for the FFs of ${\cal O}^2$.
FFs of the ${\cal O}^3$ exhibit identical behaviours to that of half-BPS, in
concordance with the classical expectations. However, the three-point FFs of
${\cal O}^3$ violate the PMT while comparing with the corresponding quantity in
the standard model, observed for the first time at the level of FF.
