Wall Street indexes close higher with quarterly and monthly gains even as US government shutdown looms

Market Performance - The S&P 500 gained 3.53% in September, marking its largest percentage gain for the month since 2010, and rose 7.79% for the third quarter, the biggest gain since 2020 [3][6] - The Nasdaq rose 11.24% for the third quarter, its largest gain since 2010, and increased 5.61% in September, the biggest gain since 2019 [3][4] - The Dow climbed 5.22% for the third quarter and rose 1.87% in September [3][4] Sector Performance - Among the S&P 500's 11 major industry sectors, healthcare led with a gain of 2.45%, with Pfizer being the biggest gainer, rallying 6.8% after announcements regarding drug pricing [6][4] - The Dow Jones Transportation Average Index fell 0.4%, with airlines leading declines due to the threat of a government shutdown [6] Stock Movements - Chipmaker Wolfspeed surged 29% after exiting bankruptcy, while Firefly Aerospace shares sank 20.7% following a testing mishap [6] - Lamb Weston shares rose 4.3% after beating analysts' estimates for first-quarter revenue and profit [6] Market Dynamics - Advancing issues outnumbered decliners by a 1.27-to-1 ratio on the NYSE, with 352 new highs and 87 new lows, while on the Nasdaq, declining issues outnumbered advancers by a 1.02-to-1 ratio [7] - The S&P 500 posted 48 new 52-week highs and 4 new lows, while the Nasdaq recorded 104 new highs and 85 new lows [7]