  We present an estimate of the bulk flow in a volume of radii
$150-200h^{-1}$Mpc using the minimum variance (MV) method with data from the
CosmicFlows-4 (CF4) catalog. The addition of new data in the CF4 has resulted
in an increase in the estimate of the bulk flow in a sphere of radius
$150h^{-1}$Mpc relative to the CosmicFlows-3 (CF3). This bulk flow has less
than a $0.03\%$ chance of occurring in the Standard Cosmological Model
($\Lambda$CDM) with cosmic microwave background derived parameters. Given that
the CF4 is deeper than the CF3, we were able to use the CF4 to accurately
estimate the bulk flow on scales of $200h^{-1}$Mpc (equivalent to 266 Mpc for
Hubble constant $H_o=75$ km/s/Mpc) for the first time. This bulk flow is in
even greater tension with the Standard Model, having less than $0.003\%$
probability of occurring. To estimate the bulk flow accurately, we introduce a
novel method to calculate distances and velocities from distance moduli that is
unbiased and accurate at all distances. Our results are completely independent
of the value of $H_o$.
