US stocks weekly: Techno-Angst!

S&P 500 .SPX snaps three-week winning streak, retreats 1.6% as jitters over stretched tech valuations, the economy curb risk appetite .N

Dow .DJI falls 1.2%, while tech-heavy Nasdaq Composite .IXIC tumbles 3% for its worst week since early Apr

U.S. 10-Year Treasury yield US10YT=RR ticks lower to end around 4.09%. Yields fell on Thurs on worries over a weakening U.S. labor market, along with uneasiness around the government shutdown and legality of President Trump's tariffs US/

In the end, only a minority of sectors perturbed: Technology most agitated, while defensive plays exhibit composure

Tech .SPLRCT tanks 4.2%. AI darling Palantir PLTR.O slides from peak after qtrly results surpass Wall Street's expectations; "Big Short" investor Michael Burry discloses bearish bets against PLTR and Nvidia NVDA.O

AI server maker Super Micro SMCI.O plummets 23% on week after qtrly miss on GPU delivery delays

Qualcomm QCOM.O falls despite upbeat qtrly forecast as potentially smaller Samsung 005930.KS business weighs

Semiconductor index .SOX sheds nearly 4%

Consumer Discretionary .SPLRCD drops 1.5%. DoorDash DASH.O dives after Q3 profit miss on mounting costs, new investment plan unnerves investors

Tesla TSLA.O down; shareholders approve CEO Elon Musk's $1 trillion pay package

Though Amazon.com AMZN.O leaps on Mon after $38 bln AWS deal with OpenAI. AMZN ekes out fractional weekly gain

And McDonald's MCD.N rises slightly after Q3 global comp sales beat, aided by value meal offers

Consumer Staples .SPLRCS up 0.8%. Tylenol-maker Kenvue KVUE.N jumps on nearly $49 bln buyout deal from Kleenex tissue maker Kimberly-Clark KMB.O, but KMB slumps

Meanwhile, investor optimism wanes in latest week - AAII survey

SPX performance YTD: