Prolific sf author Nancy Kress has won Hugos and Nebula awards but she’s never won a Prometheus Award. Not yet, anyway.
Nor was Kress nominated for The Eleventh Gate, an interesting 2020 novel (recently reviewed in the Prometheus blog) that pits libertarian planets against more authoritarian worlds.
Nevertheless, Kress has been frequently recognized within the history of the Prometheus awards.
In fact, she has been nominated four times for Best Novel – and one of her novels (Beggars in Spain) was voted a Best Novel finalist.