We show that

N = 4

supersymmetric-Yang-Mills (SYM) theory on

R \times S^{3}

with gauge group

SU (N)

is described in a near-BPS limit by a simple lower-dimensional nonrelativistic field theory with

SU (1, 1) \times U (1)

invariant interactions. In this limit, a single complex adjoint scalar field survives, and part of its interaction is obtained by exactly integrating out the gauge boson of the SYM theory. Taking into account normal ordering, the interactions match the one-loop dilatation operator of the

SU (1, 1)

sector, establishing the consistency of the limit at the quantum level. We discover a tantalizing field-theoretic structure, corresponding to a (

1 + 1

)-dimensional complex chiral boson on a circle coupled to a nondynamical gauge field, both in the adjoint representation of

SU (N)

. The successful construction of a lower-dimensional nonrelativistic field theory in the SU(1,1) near-BPS limit provides a proof of concept for other BPS bounds. These are expected to lead to richer field theories in nonrelativistic corners of

N = 4

SYM that include fermions, gauge fields, and supersymmetry and can provide a novel path towards understanding strongly coupled finite-

N

dynamics of gauge theories.

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