A healthy pullback for SP500 would be -5% to -10%. Note that from 7/27/23 high, the 50-dMA is -4.35% below and 200-dMA -11.08% below. So, the pullback may be seen as the tests of 50-dMA, then 200-dMA.
Once the selling starts, where does it stop? Hopefully, -10% to -11% (200-dMA).
Don't forget that 10/13/22 low was a decent amount BELOW the MAs, -11.42% BELOW 50-dMA, -16.21% BELOW 200-dMA. Keep your fingers crossed that we don't go there as that would be -24.21% below 7/27/23 high.
As a practical matter, I may start buying somethings when we are down -5% to -10% and scale in more as needed.
https://stockcharts.com/h-sc/ui?s=$SPX&p=D&yr=1&mn=0&dy=0&id=p11025466305
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A few I monitor: FTEC (Fidelity tech), QQQ (growth stocks overall), FBCG (Fidelity Blue Chip Growth) and FBALX.
Chart of these four from Oct. 18, 2022. Some of the YTD numbers are better. EX: FBCG was +48 YTD prior to this weeks sell down.