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We present aperture masking interferometry (AMI) observations of the star HIP65426 at $3.8\,\rm{\mu m}$ as a part of the \textit{JWST} Direct Imaging EarlyRelease Science (ERS) program obtained using the Near Infrared Imager andSlitless Spectrograph (NIRISS) instrument. This mode provides access to verysmall inner working angles (even separations slightly below the Michelson limitof ${}0.5\lambda/D$ for an interferometer), which are inaccessible with theclassical inner working angles of the \textit{JWST} coronagraphs. When combinedwith \textit{JWST}'s unprecedented infrared sensitivity, this mode has thepotential to probe a new portion of parameter space across a wide array ofastronomical observations. Using this mode, we are able to achieve a contrastof $\Delta m_{F380M}{\sim }7.8$\,mag relative to the host star at a separationof ${\sim}0.07\arcsec$ but detect no additional companions interior to theknown companion HIP\,65426\,b. Our observations thus rule out companions moremassive than $10{-}12\,\rm{M\textsubscript{Jup}}$ at separations${\sim}10{-}20\,\rm{au}$ from HIP\,65426, a region out of reach of ground orspace-based coronagraphic imaging. These observations confirm that the AMI modeon \textit{JWST} is sensitive to planetary mass companions orbiting at thewater frost line, even for more distant stars at $\sim$100\,pc. This resultwill allow the planning and successful execution of future observations toprobe the inner regions of nearby stellar systems, opening essentiallyunexplored parameter space.

The \textit{JWST} Early Release Science Program for Direct Observations  of Exoplanetary Systems III: Aperture Masking Interferometric Observations of  the star HIP\,65426 at $\boldsymbol{3.8\,\rm{\mu m}}$