NEW YORK (Reuters) -Wall Street's largest hedge funds, Bridgewater Associates, Tiger Global Management and Discovery Capital, increased their exposure to Big Tech in the second quarter amid a generational boom in the growth of artificial intelligence.

During the June quarter, hedge funds cut their exposure to laggards in industries like aerospace and defense, and consumer and retail, as part of a broader move back to momentum investing.

It marks a big shift from earlier this year when bets on Big Tech had soured for top money managers due to tariff-fueled volatility in financial markets, with investor concerns around rising inflation and fears of a bubble in AI triggering a sell-off in "Magnificent Seven" stocks.

Since then, tech stocks have staged a big comeback. The S&P 500 is up 10% so far this year, buoyed largely by the largest tech companies, which account for nearly a third of the combined market cap of companies on the index.

Outside technology, some hedge funds, such as Lone Pine and Discovery, also bet on UnitedHealth Group ( UNH ). Berkshire Hathaway ( BRK/A ) and Michael Burry's Scion Asset Management also unveiled bets on the insurer, while Soros Fund Management boosted an existing position.

Shares in UnitedHealth ( UNH ) are down 46% this year, as the company faces rising costs, a U.S. Department of Justice probe, a cyberattack and the shooting of former top executive Brian Thompson last December.

The fund's positions were revealed in quarterly securities filings known as 13Fs. While backward-looking, these filings typically reveal what funds owned on the last day of the quarter and are one of the few ways hedge funds and other institutional investors have to declare their positions.

Below are the details of the changes in the holdings of the top hedge funds:

BRIDGEWATER ASSOCIATES

Bridgewater Associates added more shares in Nvidia ( NVDA ), Alphabet and Microsoft ( MSFT ) in the second quarter.

    The macro hedge fund founded by Ray Dalio more than doubled its bets in Nvidia ( NVDA ). It ended June with 7.23 million shares in the chipmaker, or 154.5% more than it had at the end of March. Nvidia ( NVDA ) was Bridgewater's biggest bet in a single stock, totaling $1.14 billion.

    Its holdings in Alphabet and Microsoft ( MSFT ) went up by 84.1% and 111.9%, respectively, amounting to $987 million and $853 million.

    Other AI-related stocks added were Broadcom ( AVGO ) (+102.7%), to 317.8 million shares, or $317 million, and Palo Alto Networks ( PANW ) (+117%), to 313.8 million, or $314 million.

DISCOVERY CAPITAL

Discovery Capital, whose founder Rob Citrone has recently been bullish on Mexico's America Movil due to its exposure to Latin America, doubled its stake in the wireless provider during the second quarter.

For the quarter ended June 30, the fund amassed another 2.65 million shares, valuing its current holding in America Movil at about $95 million.

Citrone's hedge fund, which generated a 52% windfall on its investments last year, has increased its exposure to Latin America as part of a strategy to diversify from U.S. holdings.

During the quarter, Discovery increased its holdings in Big Tech, as it more than doubled its stake in Meta Platforms, the parent company of Facebook, while also betting on booming demand for AI as it took a new position in Nvidia ( NVDA )-backed cloud provider CoreWeave ( CRWV ).

The hedge fund also increased its position in UnitedHealth ( UNH ) by 13%.

TIGER GLOBAL MANAGEMENT

    Tiger Global Management bought more stocks in some Magnificent Seven companies in the second quarter, including Amazon.com ( AMZN ), Alphabet, Nvidia ( NVDA ), Microsoft ( MSFT ) and Meta, its 13Fs showed.

    Chase Coleman's hedge fund added roughly 4 million shares of Amazon ( AMZN ) and ended June with roughly 10 million shares, worth $2.34 billion.

    The fund also increased its bets in smaller AI-players. It added over 800,000 shares in chip-making equipment supplier Lam Research Corp ( LRCX ), ending June with 5.26 million shares, valued at $512 million.

COATUE MANAGEMENT

Many changes in Philippe Laffont's Coatue Management portfolio were also around AI-related stocks. It unveiled new positions in both Arm Holdings and Oracle, adding stakes worth roughly $750 million and $843 million, respectively. Both companies have boosted AI-related business initiatives.

    Coatue also increased its holdings in Nvidia ( NVDA )-backed CoreWeave ( CRWV ), adding 3.39 million shares in the second quarter, with its stake in the company worth $2.9 billion.

LONE PINE

Lone Pine Capital took a new position in UnitedHealth Group ( UNH ), buying up 1.69 million shares worth about $528 million during the June quarter.