  We present measurements of the Cabibbo-suppressed decays $\Lambda_c^+ \to
\Lambda^0 K^+$ and $\Lambda_c^+ \to \Sigma^0 K^+$ (both first observations),
$\Lambda_c^+ \to \Sigma^+ K^+\pi^-$ (seen with large statistics for the first
time), $\Lambda_c^+ \to p K^+ K^-$ and $\Lambda_c^+ \to p \phi$ (measured with
improved accuracy). Improved branching ratio measurements for the decays
$\Lambda_c^+ \to \Sigma^0 K^+ K^-$ and $\Lambda_c^+ \to \Sigma^0 \phi$, which
are attributed to W-exchange diagrams, are shown. We also present the first
evidence for $\Lambda_c^+ \to \Xi(1690) K^+$ and set an upper limit on
non-resonant $\Lambda_c^+ \to \Sigma^0 K^+ K^-$ decay. This analysis was
performed using 23.6 fb$^{-1}$ of data collected by the Belle detector at the
$e^+ e^-$ asymmetric collider KEKB.
