** S&P 500 .SPX falls second straight week, finishes down 1% in choppy trading as Nvidia report, fears of cooling economy and trade wars weigh .N

** Dow .DJI adds ~1%, but Nasdaq Composite .IXIC slides 3.5%

** S&P 500 tests trend line, takes another tumble, while Nasdaq composite suffers worst week since Sept of last year, as internal measure nears important juncture

** U.S. 10-Year Treasury yield US10YT=RR falls to ~4.21%, on track for a fifth week in a row of declines

** In the end, a majority of sectors resilient: Financials most solid, while Tech gets hammered

** Tech .SPLRCT throttled 4%. Nvidia's NVDA.O optimistic forecast fails to convince. NVDA declines 7% on the week.

Super Micro SMCI.O jumps after filing delayed annual report, sidesteps de-listing threat, however, proves to be weakest SPX stock, sheds ~26%, as NVDA drags chipmakers, AI-related stocks lower

Semiconductor index .SOX sputters 7.2%

Apple AAPL.O says plans to spend more than $500 bln in U.S. over next four years. AAPL posts ~2% weekly loss

Salesforce CRM.N falls after weak annual forecast puts spotlight on AI monetization, and Dell DELL.N declines after forecasting drop in FY26 gross margin

** Consumer Discretionary .SPLRCD down 2.1%. Tesla TSLA.O tumbles >13% after data shows sales slump in Europe. Though Home Depot HD.N gains after surprise rise in comparable sales

** Utilities .SPLRCU sag 1.5%. Sempra SRE.N slumps after 2025 profit forecast cut citing high costs

** Healthcare .SPXHC lifts 1.7%. Solventum SOLV.N rises >9% after $4.1 billion sale of purification and filtration unit

On the flip side, Moderna MRNA.O falls after report Trump administration weighs pulling funding for its bird flu vaccine

And surgical equipment maker Teleflex TFX.N has worst day ever after forecasting 2025 profit below estimates. TFX collapses ~24% for the week

** Real estate .SPLRCR rallies 2.1%. American Tower AMT.N climbs, leads sector higher on Tues after its report, and tumbling yields

** Financials .SPSY firm 2.8%. Berkshire Hathaway BRKa.N shares hit new record high following record profit

** Meanwhile, Bitcoin BTC= stumbles to lowest since Nov amid risk-off sentiment, and individual investor bulls and bears see some eye popping moves

** SPX performance YTD:

(Lance Tupper and Terence Gabriel are Reuters market analysts. The views expressed are their own)

((lance.tupper@tr.com ; terence.gabriel@tr.com))