Democratic traders assign a 73% implied probability to their party securing control of the Pennsylvania State Senate after the November 3 election, compared with 19.5% for Republicans. Republicans enter with a narrow 27-23 majority and 25 seats on the ballot in a chamber they have held since 1994. Democrats need a net gain of three seats for a majority, targeting competitive Republican-held districts in suburban and exurban areas such as Bucks County. Democratic Governor Josh Shapiro’s decisive reelection provides potential coattails in these battleground districts, while both parties focused resources on a handful of winnable races amid divided government. Trader positioning reflects the closely contested map and recent statewide momentum favoring Democratic candidates in legislative contests.