  We present a compact formula, expressed in terms of classical polylogarithms
up to weight three, for the leading order four-point energy correlator in
maximally supersymmetric Yang-Mills theory, in the limit where the four
detectors are collinear. This formula is derived by combining a simplified,
manifestly dual conformal invariant form of the 1 -> 4 splitting function
obtained from the square of the tree-level five-particle form factor of
stress-tensor multiplet operators, with a novel integration-by-parts algorithm
operating directly on Feynman parameter integrals. Our results provide valuable
data for exploring the structure of physical observables in perturbation
theory, and for calculations of jet substructure observables in quantum
chromodynamics.
