FILE - In this Sept. 2, 2008, file photo Google co-founders Sergey Brin, left, and Larry Page talk about the new Google Browser, "Chrome," during a news conference at Google Inc. headquarters in Mountain View, Calif. Page and Brin are stepping down from their roles within the parent company, Alphabet. Page, who had been serving as CEO of Alphabet, and Brin, who had been president of Alphabet, will remain on the board of the company. (AP Photo/Paul Sakuma, File)

FILE - In this Sept. 2, 2008, file photo Google co-founders Sergey Brin, left, and Larry Page talk about the new Google Browser, "Chrome," during a news conference at Google Inc. headquarters in Mountain View, Calif. Page and Brin are stepping down from their roles within the parent company, Alphabet. Page, who had been serving as CEO of Alphabet, and Brin, who had been president of Alphabet, will remain on the board of the company. (AP Photo/Paul Sakuma, File)

SAN FRANCISCO (AP) — The co-founders of Google are stepping down as executives of its parent company, Alphabet, ending a remarkable two decades during which Larry Page and Sergey Brin shaped a startup born in a Silicon Valley garage into one of the largest, most powerful — and, increasingly, most feared — companies in the world.

Sundar Pichai, who has been leading Google as CEO for more than four years, will take on additional duties as Alphabet’s CEO, the position held by Page. The company isn’t filling Brin’s position as president.

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Page and Brin started Google soon after they met as Stanford University graduate students in 1995.

What began as a way to catalog the growing internet has now become one of the most influential companies in the world. Google dominates online search and digital advertising and makes the world’s most widely used operating system for smartphones, Android. It’s hard to make it through a whole day without using one of Google’s services — ranging from online tools to email, cloud computing systems, phones and smart speaker hardware.

Yet Google has been facing pressure from privacy advocates over its collection and use of personal information to target advertising. It also faces allegations that it abuses its dominance in search and online advertising to push out rivals.

Google is the subject of antitrust inquiries from Congress, the Department of Justice and a contingency of states in the U.S. and from European authorities. The company has also faced harsh criticism about the material on its services. Its video streaming business, YouTube, was fined $170 million to settle allegations it improperly collected personal data on children without their parents’ consent.

Longtime tech analyst Tim Bajarin of Creative Strategies doesn’t expect much to change with the executive shuffle. And if anything does, he said, it will be due to government regulation.

Pichai assured employees in an internal email that his new job wouldn’t mean he was taking a step back from Google.

“I want to be clear that this transition won’t affect the Alphabet structure or the work we do day to day,” he wrote. “I will continue to be very focused on Google and the deep work we’re doing to push the boundaries of computing and build a more helpful Google for everyone.”

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Alphabet — an umbrella corporation that the two created in 2015 — still boasts Google as its central fixture and key moneymaker. But it’s also made up of what are known as “other bets,” or longshot projects. That includes drone company Wing and self-driving car firm Waymo.

Page and Brin, in announcing the news Tuesday, said the company has “evolved and matured” in the two decades since its founding. Both promised to stay active as board members and shareholders.

“Today, in 2019, if the company was a person, it would be a young adult of 21 and it would be time to leave the roost,” they wrote in a blog post.

Page and Brin, both 46, both have been noticeably absent from Google events in the past year. Both stopped making appearances at the weekly question-and-answer sessions with employees, and Page didn’t attend this summer’s Alphabet shareholders meeting even though he was still in the CEO role.

Alphabet has been positioning Pichai as the de facto leader for quite some time. It has made him the top executive voice at shareholders meetings, on earnings call and as a spokesman at congressional hearings.

Pichai, 47, has worked at the company for 15 years, serving as a leader in projects to build Google’s Chrome browser and overseeing Android. Pichai, who has an engineering background, took over as the head of Google’s products before being promoted to CEO when Alphabet was created. Pichai is known as a soft-spoken and respected manager.

Last year, Google raised hackles in Congress by refusing to send Page or Pichai to a hearing on Russian manipulation of internet services to sway U.S. elections. Congressional officials left an empty chair while top executives from Facebook and Twitter appeared. Offended lawmakers derided Google as “arrogant.”

Although Bajarin said he doesn’t believe Brin and Page are leaving “because the fire is getting hotter,” he said Pichai’s role at Google has been preparing him for the increased government scrutiny.

Brin and Page still hold a majority of voting shares of Alphabet. According to a regulatory filing in April, Page holds 42.9% of the company’s Class B shares and 26.1% of its voting power. Brin holds 41.3% of the Class B shares and 25.2% of the voting power. According to Forbes magazine, Page has a net worth of $52.4 billion and Brin $56.8 billion.

“Keep in mind, they are not losing their title as billionaires, but they are changing their roles,” Bajarin said.

Google’s stock increased less than 1% in after-hours trading after the news was announced.

Google’s longest serving CEO is still Eric Schmidt, the former executive brought into the role in 2001 as a so-called “adult supervisor” for Brin and Page. Schmidt stepped into the position as the company’s board worried about the relative inexperience of Brin and Page to manage the growing company. He remained CEO until 2011, when Page once again became chief executive. Schmidt stayed on the board until this year.

Page grew up in Michigan, where his late father, Carl, was a computer scientist and pioneer in artificial intelligence, and his mother taught computer programming. Page began working on personal computers when he was just 6 years old in 1979, when home computers were a rarity. The geeky impulses carried into his adulthood, leading him to once build an inkjet printer out of Legos.

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AP Technology Writers Mae Anderson in New York and Barbara Ortutay in San Francisco contributed to this story.