A new OxygenOS 9.5.6 update is currently being rolled out to OnePlus 7, which brings June 2019 security patches and various Camera improvements.
Today, Essential has pushed out the Android May security patch to the Essential Phone and the update arrives as Android Pie build PQ1A.190105.058.
Samsung is currently rolling out the January 2019 Android security patch, which brings bug fixes and performance upgrades for Galaxy Note 8.
Samsung is currently rolling out a new update for Galaxy A8+ (2018) that includes Android January 2019 security patch.
Google has released new factory images for most supported Pixel and Nexus devices, which has the March 2017 Android security update.
HTC has released a new update to HTC 10 for North America, which brings June Android Security patch along with bug fixes and performance improvements.