(Reuters) -Google parent Alphabet Inc on Tuesday beat quarterly revenue estimates and announced a $50 billion share buyback as the recovering economy and surging use of online services combined to accelerate its advertising and cloud businesses.

FILE PHOTO: A man walks past a logo of Alphabet Inc’s Google in front of at an office building in Zurich, Switzerland July 1, 2020. REUTERS/Arnd Wiegmann

Alphabet shares rose about 4% to $2,375 in extended trading.

The results are the first sign that Google services may hold on to gains in usage brought on by lockdowns and other pandemic restrictions that forced people to shop and communicate online over the last year.

Google ad sales surged 32% in the first quarter compared with a year ago, above expectations of analysts tracked by Refinitiv. Cloud sales increased 45.7%, in line with estimates.

About 17% of people in the United States, Alphabet’s top region by revenue, were fully vaccinated against COVID-19 by the end of the first quarter. Activities including in-person dining resumed in big cities in March, and security screenings at U.S. airports had their busiest day in a year.

The changes coincided with Alphabet’s overall sales rising 34% to $55.3 billion, above analysts’ estimate of $51.7 billion, or 26% growth over last year’s first quarter, when ad sales fell significantly in the final couple of weeks.

Alphabet’s quarterly profit rose 162% to $17.9 billion, or $26.29 per share, beating estimates of $15.88 per share. Earnings benefited from unrealized gains from venture capital investments and slower depreciation of some data center equipment.

The share repurchase authorization by Alphabet’s board follows a $25 million buyback program announced in 2019.

It was not immediately clear which industries powered Google’s growth in ad and cloud sales, but that topic is expected to come up when analysts question Alphabet executives in a conference call later on Tuesday.

Increased ad buying by travel and entertainment companies would be a positive sign as hotel booking services and movie studios are among Google’s biggest spenders.

Also of interest could be Google’s update on efforts to reach long-term cloud computing deals with retailers or companies that bought services in a rush last year.

Google’s newer consumer subscription businesses, such as an ad-free version of YouTube, also could capture analysts’ attention.

Alphabet in 2020 suffered its slowest sales growth in 11 years but posted record profit and upped its cash hoard by $17 billion after slowing hiring and construction.

Its shares have surged 80% in the last year, 184th among companies in the S&P 500 index.

Privacy and antitrust lawsuits against Google that could result in changes to its ad operations have remained a concern for investors, according to analysts. But resolution remains distant, with one key trial not expected until 2023.

The latest dispute emerged on Monday when streaming TV technology company Roku Inc accused Google of engaging in anticompetitive behavior to benefit its YouTube and hardware businesses.

Discussions about changing U.S. and European laws to impose new oversight on Google and other companies, especially regarding privacy and artificial intelligence, have lagged as legislators have been distracted by the pandemic.

Reporting by Subrat Patnaik in Bengaluru and Paresh Dave in Oakland, Calif.Editing by Devika Syamnath and Matthew Lewis

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