The Democratic former congresswoman and the incumbent Republican senator will face off in November. Whether a potential spoiler candidate with the same name as the senator qualifies alongside them has not been determined.
NBC News projects that Sullivan and Peltola will advance to the general election, but it's not clear if Sullivan will also face an opponent with the same name.
The incumbent Republican has been a reliable supporter of President Trump, giving Democrats a pickup opportunity in a state where most are politically unaffiliated.
The Alaska Native, who grew up along the Kuskokwim River near the Bering Sea and fished for salmon, is the leading Democrat in the nonpartisan primary race.