Sean Penn and Wunmi Mosaku’s BAFTA Upsets Put SAG Actor Awards Under the Microscope

sean penn's upset victory at the BAFTAs, paired with Wunmi Mosaku's surprise win in the supporting categories, has scrambled many season forecasts as attention now turns to the SAG Actor Awards and the run-up to the 98th Academy Awards on March 15, 2026.

Sean Penn’s BAFTA shock and how betting moved

BAFTA voters handed wins in the supporting performance races to Sean Penn and Wunmi Mosaku, outcomes that industry observers called unexpected and that pushed odds higher for both performers on prediction leaderboards. The BAFTA results prompted a flurry of reaction in editorial chat channels after the awards night, and betting markets showed notable movement with Sean Penn and Stellan Skarsgård at the top of the field in some markets.

SAG Actor Awards will test whether BAFTA was an outlier

The next stop is the SAG Actor Awards, which will determine whether the BAFTA outcomes are anomalies or confirmation of new frontrunners. A survey of 150 anonymous SAG Actor Awards voters found ballots favor Timothée Chalamet, Amy Madigan…and Rose Byrne, an unexpected mix that could complicate predictions leading into the SAG vote. Editors watching the race still view Penn as a longer shot because of his general disinterest in campaigning, but a SAG win would strengthen the case that his BAFTA victory marked real momentum.

BAFTA voting quirks and split results across groups

Observers have described the BAFTA supporting winners as perplexing, noting that BAFTA's voting rules have shifted over time: the organization did not hold separate supporting categories before the Oscars until 2000 and revised its voting again in 2012. Those shifts help explain why winners at the Globes, BAFTA and SAG have diverged in recent seasons—examples this year include Stellan Skarsgård winning the Globe but not receiving a SAG nomination, and Amy Madigan emerging as a possible SAG contender despite not being a BAFTA nominee.