The major European indices are off to a positive start for the week. The gains were led by the UK's FTSE 100 in the German DAX. A snapshot of the closing levels shows:German DAX +0.51%France's CAC +0.31%UK's FTSE 100 +0.55%Spain's Ibex +0.18%Italy's FTSE MIB +0.07%As London/European traders head for the exits, the major US indices remain positive territory:Dow industrial average up 387 points or 0.83% at 46942.59S&P index up 65.04 points or 0.98% at 6697.20.NASDAQ index up 278 points or + 1.26% to 2384.33.Some of the biggest gainers today• Nebius NV (NBIS) +16.63% — strongest move of the day as AI infrastructure names led gains• Dollar Tree (DLTR) +6.14% — discount retail strength as consumer names moved higher• Ciena (CIEN) +5.63% — networking infrastructure demand tied to data and AI growth• Micron (MU) +5.56% — memory chip maker benefiting from AI server demand• Arm (ARM) +5.15% — semiconductor architecture company riding AI chip momentum• Intel (INTC) +4.55% — semiconductor sector rebound helped lift shares• MicroStrategy (MSTR) +4.39% — crypto-linked stock moving higher with Bitcoin•• Synopsys (SNPS) +3.43% — chip design software company benefiting from semiconductor demand• Chipotle Mexican Grill (CMG) +3.43% — consumer discretionary strength• Roblox (RBLX) +3.16% — tech and growth stocks gaining on risk-on sentiment• United Airlines (UAL) +3.08% — travel sector bid on stronger risk appetite• Shopify (SHOP) +3.08% — e-commerce stock rising with growth tech• Stryker (SYK) +3.05% — healthcare equipment maker posting steady gains• Western Digital (WDC) +3.02% — storage and data infrastructure demand• Intuit (INTU) +3.07% — software sector strength helping lift shareLooking at the other markets:Crude oil is trading down $-3.67 or -3.73% and $95.54Gold is trading down $28 or -0.57% at $4989.74.Silver is down $0.37 or -0.45% at $80.21.Bitcoin is trading up around $900 at $73,730 This article was written by Greg Michalowski at investinglive.com.