The bulls seemed to think they were in charge up until the latest CPI data was released. Then, in an abrupt change of face big money began to sell on Sep 13th and just kept driving the market lower all day. That selling has continued, at a slower pace, and the support area at 3900 has been violated. That is important support, and now traders are looking to 3800 as the next support level, and then the yearly lows at 3673 below that.
Early this week, stocks continued to sell off from their mid- August highs. But oversold conditions emerged (and are still in place in some cases), and $SPX rallied off of the 3900 level. That reinforces short-term support at 3900, and there should be support below that at 3800 and at the yearly lows, nearly 3637. But the next area of importance might be the resistance levels the first of which is at 4200, and then 4300 (the mid-August) highs. These oversold rallies have occurred all during 2022, with the average one gaining about 300 $SPX points.
Stocks have continued their sharp pullback after failing to break through the bear market downtrend line. That challenge came in mid-August at the 4300 level, and the decline since then has been steady and swift. Oversold conditions are beginning to appear, and soon we will see some confirmed buy signals, but the $SPX chart is still bearish and so a "core" bearish position is recommended. Other signals can be traded around that.