For a Reuters live blog on U.S., UK and European stock markets, click LIVE/ or type LIVE/ in a news window.<div class="tr-summaryinfo">Indexes down: Dow 0.52%, S&amp;P 500 0.93%, Nasdaq 1.34%Netflix down on JPM analyst focus list removalBlackstone infrastructure unit to acquire TXNM Energy</div>Updates after markets openBy Shashwat Chauhan and Kanchana Chakravarty May 19 (Reuters) - Wall Street's main indexes slipped on Monday, with technology stocks falling as Treasury yields spiked after Moody's downgraded the U.S. sovereign rating, sharpening focus on its mounting debt.Moody's cut the United States' sovereign credit rating to &#34;Aa1&#34; from &#34;Aaa&#34; late on Friday owing to concerns about its ballooning $36-trillion debt, becoming the last of the three major credit rating agencies to downgrade the country. It had first given the U.S. its pristine &#34;Aaa&#34; rating in 1919. &#34;Nothing new, but it's putting a lot of things that the market has worried about rightfully back into focus,&#34; said Ross Mayfield, investment strategist at Baird. &#34;The trade headwinds keep markets volatile, but this morning in particular, it's about the Moody's downgrade.&#34;Worries about the ever-increasing U.S. deficit were front and center as U.S. President Donald Trump's sweeping tax-cut bill - which Republican infighting over spending cuts had stalled for days - won approval from a key congressional committee on Sunday.At 09:35 a.m. ET, the Dow Jones Industrial Average .DJI fell 222.40 points, or 0.52%, to 42,432.34, the S&amp;P 500 .SPX lost 55.42 points, or 0.93%, to 5,902.96, and the Nasdaq Composite .IXIC lost 257.49 points, or 1.34%, to 18,953.61. Ten of the 11 S&amp;P sub-sectors fell, with consumer discretionary .SPLRCD and energy .SPNY being the worst performers. Highly valued technology stocks took a hit as rising rates tend to discount the present value of future profits. Tesla TSLA.O led losses among megacap and growth stocks with a 4.1% fall.Chip stocks also sold off. Nvidia NVDA.O was down 1.4% and a gauge for semiconductor stocks .SOX shed 1.9%. Yields on U.S. government bonds - which move inversely to prices - ticked higher, with the 10-year note US10YT=RR rising 9 basis points to 4.526% and the 30-year note US30YT=RR touching 4.998%.The S&amp;P 500 .SPX had registered its fifth straight day of gains on Friday, closing out the week with firm gains as markets took heart from a temporary tariff truce between the U.S. and China along with tame inflation data.U.S. Treasury Secretary Scott Bessent said in television interviews over the weekend that Trump would impose tariffs at the rates he had threatened last month on trading partners that do not negotiate deals in &#34;good faith&#34;.The U.S. Federal Reserve might only be able to cut interest rates by a quarter point through the rest of the year, Atlanta Fed president Raphael Bostic said, while New York Fed President John Williams said that the interest-rate policy was in the right place to deal with an uncertain economic outlook.In other moves, Netflix NFLX.O fell almost 1% after J.P.Morgan removed the stock from its U.S. analyst focus list.TXNM Energy TXNM.N jumped 7.6% after the utility said it would be acquired by the infrastructure unit of Blackstone BX.N in an $11.5-billion deal.Declining issues outnumbered advancers by a 5.98-to-1 ratio on the NYSE, and by a 2.91-to-1 ratio on the Nasdaq.The S&amp;P 500 posted three new 52-week highs and no new lows, while the Nasdaq Composite recorded 10 new highs and 23 new lows.

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Wall Street's main indexes fell on Monday as Treasury yields rose following Moody's downgrade of the U.S. sovereign rating from "Aaa" to "Aa1" due to concerns over the $36-trillion debt. The Dow dropped 0.52%, S&P 500 fell 0.93%, and Nasdaq declined 1.34%. Technology stocks were particularly affected, with Tesla down 4.1%. The 10-year Treasury yield rose to 4.526%. Netflix fell nearly 1% after being removed from J.P. Morgan's focus list, while TXNM Energy surged 7.6% after announcing its acquisition by Blackstone.

- Wall Street's main indexes declined as technology stocks fell following Moody's downgrade of the U.S. sovereign rating due to concerns over its $36-trillion debt.  
- The Dow Jones Industrial Average dropped 0.52%, the S&P 500 fell 0.93%, and the Nasdaq Composite decreased by 1.34%, with consumer discretionary and energy sectors performing the worst.  
- Rising Treasury yields impacted highly valued tech stocks, leading to significant losses for companies like Tesla and Nvidia, while TXNM Energy surged after announcing its acquisition by Blackstone.

US STOCKS-Wall St drops, Treasury yields rise after Moody's downgrade