Stripped envelope supernovae (SE-SNe) are the group of core-collapse SNe that strip off their outer Hydrogen envelopes due to high stellar winds or due to interaction with a binary companion where mass transfer occurs through a Roche lobe overflow. We present results of the photometric (from 3 to 509 days after the explosion) and spectroscopic (up to 230 days post explosion) monitoring campaign of a member of the subgroup, Type IIb supernova (SN) 2015as. The early light curve and colour evolution of SN 2015as suggests
that SN 2015as belongs to the SN IIb subgroup that does not show the early, short-duration photometric peak. Bolometric light curve modelling infers a binary progenitor scenario. At 75 days after the SN
explosion, its spectrum transitions from that of a SN II to a SN Ib. P Cygni features due to He I lines appear at around 30 days after explosion, indicating
that the progenitor of SN 2015as was partially stripped. SN 2015as is one of the lowest velocity member of the subgroup implying that the explosion energy is used in expanding the ejecta resulting in a fainter primary peak.