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As a baryon number violating process with $\Delta B=2$, neutron-antineutronoscillation ($n\to\bar n$) provides a unique test of baryon numberconservation. We have performed a search for $n\to\bar n$ oscillation withbound neutrons in Super-Kamiokande, with the full data set from its first fourrun periods, representing an exposure of 0.37~Mton-years. The search used amultivariate analysis trained on simulated $n\to\bar n$ events and atmosphericneutrino backgrounds and resulted in 11 candidate events with an expectedbackground of 9.3 events. In the absence of statistically significant excess,we derived a lower limit on $\bar n$ appearance lifetime in $^{16}$O nuclei of$3.6\times{10}^{32}$ years and on the neutron-antineutron oscillation time of$\tau_{n\to\bar n} > 4.7\times10^{8}$~s at 90\% C.L..

Neutron-Antineutron Oscillation Search using a 0.37 Megaton$\cdot$Year Exposure of Super-Kamiokande