Americans Phinney and Bookwalter among those to end the season without a deal in place for 2020, along with 2019 stars Dennis and Bennett.
Several GC riders brought down by a touch of wheels inside the final kilometer, though all were able to complete the stage without major injury.
Irishman Sam Bennett (Bora-Hansgrohe) won Monday's third stage of the Vuelta a España.
With 11 stage wins in 2019, the Irish sprinter is among the fastest men in the peloton. But he still feels like the third-string sprinter on his own team.
Ireland's Sam Bennett dominates sprint finish as Dylan Teuns retains lead on stage 3 of the Critérium du Dauphiné
Irishman Sam Bennett triumphs in flat-out sprint finish on stage 3 before Paris-Nice heads into more hilly terrain. Groenewegen keeps GC lead.
Irishman takes first WorldTour win of the season amongst stellar field.
Bennett sprints to first win of the season in circuit race around San Juan.