Well, they had a good run in the UFC but it looks like the ride is over for 10 fighters, according to Bloody Elbow.
As noted by Zane Simon, the fighters haven't been officially released, however this Twitter account runs a ruby script over the UFC.com roster to detect any changes when UFC updates its website.
Historically, when a fighter disappears it usually means that he's been released from his contract.
To that end, here is the list:
Mike Pierce, 17-7, 9-5 UFC, fighter with UFC since 2009, 2 fight losing streak
Danny Castillo, 17-10, 7-7 UFC, fighter with UFC since 2011, 4 fight losing streak
Steve Montgomery, 8-4, 0-2 UFC, fighter with UFC since 2015, 2 fight losing streak
Marcio Alexandre Jr, 11-3, 0-3 UFC, fighter with UFC since 2014, 3 fight losing streak
Konstantin Erokhin, 9-3, 0-2 UFC, fighter with UFC since 2015, 2 fight losing streak
Valmir Lazaro, 13-4, 1-2 UFC, fighter with UFC since 2014, 1 fight losing streak
Akbarh Arreola, 23-10-1, 1-3 UFC, fighter with UFC since 2014, 2 fight losing streak
Steve Kennedy, 22-8, 0-2 UFC, fighter with UFC since 2015, 2 fight losing streak
Hayder Hassan, 6-3, 0-2 UFC, fighter with UFC since 2015, 2 fight losing streak
Marcin Wrzosek, 10-3, 0-1 UFC, fighter with UFC since 2015, 1 fight losing streak
Some of these cuts make perfect sense, however it's the end of an era for a few big names.