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We present the discovery and timing solutions of four millisecond pulsars(MSPs) discovered in the Arecibo 327 MHz Drift-Scan Pulsar Survey. Three ofthese pulsars are in binary systems, consisting of a redback (PSR J2055+1545),a black widow (PSR J1630+3550), and a neutron star-white dwarf binary (PSRJ2116+1345). The fourth MSP, PSR J2212+2450, is isolated. We present themultiyear timing solutions as well as polarization properties across a range ofradio frequencies for each pulsar. We perform a multiwavelength search foremission from these systems and find an optical counterpart for PSR J2055+1545in Gaia DR3, as well as a gamma-ray counterpart for PSR J2116+1345 with theFermi-LAT telescope. Despite the close colocation of PSR J2055+1545 with aFermi source, we are unable to detect gamma-ray pulsations, likely due to thelarge orbital variability of the system. This work presents the first twobinaries found by this survey with orbital periods shorter than a day; weexpect to find more in the 40% of the survey data that have yet to be searched.

Discovery and Timing of Millisecond Pulsars with the Arecibo 327 MHz Drift-Scan Survey