Jittery week: Wall Street falls as investors eye Ukraine crisis

Equity swings intensified ahead of the close, with Friday’s $2.2 trillion options expiration exacerbating moves. The S&P 500 briefly turned positive before resuming its decline, with technology, energy and industrial shares dragging down the gauge. Traders also took risk off the table ahead of a United States holiday on Monday. The Nasdaq Composite tumbled into a “death cross,” a technical pattern that has at times presaged further weakness. Treasury 10-year yields approached 1.9%, while oil pared losses after sinking as much as 3% earlier in the day. Bitcoin traded near its $40,000 key psychological level. General Electric warned that supply-chain snags, a labor shortage and material inflation will be a drag on its businesses at least until the middle of this year. . . .