These are the U.S. Senate candidates in Massachusetts

Cambridge voters mark their ballots in the 2016 presidential election. —David L Ryan/The Boston Globe

Whether you’re ready for autumn or not, September is right around the corner — and so are the Massachusetts primary elections.

Republicans have three choices on the Sept. 4 U.S. Senate primary ballot — a state representative, a former governor’s senior aide, and a businessman. Democrats will see incumbent Elizabeth Warren running unopposed, with independent Shiva Ayyadurai also set for the November ballot.

Here’s everyone who’s running for a party nomination in the primary election next month:

Republicans

Geoff Diehl

Barry Chin / The Boston Globe

Age: 49

Town/City: Whitman

Background: Diehl is the current state representative for the 7th Plymouth District and is the former co-chairman of the state effort to elect President Donald Trump. He received the GOP endorsement at the party’s convention in April.

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Beth Lindstrom

Craig F. Walker / The Boston Globe

Age: 56

Town/City: Groton

Background: Lindstrom, a small business owner, served in Gov. Mitt Romney’s administration as the Consumer Affairs and Business Regulation director. She was also the Massachusetts Republican Party’s first woman executive director and later became the executive director of the state lottery.

John Kingston

Winslow Townson / AP

Age: 52

Town/City: Winchester

Background: A political newcomer, Kingston served as general counsel and vice chairman of the investment management company, Affiliated Managers, Group, Inc. Since 2015, he has founded civic nonprofits, such as Better for America which worked to put an independent on the 2016 presidential ballot.

Democrats

Elizabeth Warren

Steven Senne / AP

Age: 69

Town/City: Cambridge

Background: A sitting senator for Massachusetts who helped form the Consumer Financial Protection Bureau, Warren is vying for election to a second, six year-term. Previously, she taught law, specifically bankruptcy and commercial law, for over three decades.

Independents

(Note: Independents do not need to seek a party nomination in the primary before the Nov. 6 general election and are therefore not on the primary election ballot next month, according to the Massachusetts Secretary of State’s office.)

Shiva Ayyadurai

John Tlumacki / The Boston Globe

Age: 54

Town/City: Belmont

Background: Holding four degrees from MIT, the scientist and entrepreneur has founded several technology companies, including the Cambridge-based pharmaceutical company CytoSolve, Inc. This election is also his first run for public office.