Reason: $AMGN broke into a fresh breakout regime - RSI jumped to 72.8 (overbought) on a +7.33% week, now just -1.23% off a 52-week high; TMO's overbought extension deepened further (+10.12% 7D, up from +6.72%); MRNA's decline decelerated on RSI even as its distance from a 52-week high hit a fresh low; VRTX reversed higher.

Tape Read

$AMGN is the story this cycle: what had been "the sector's steadiest name, closing in on a fresh high" for five straight reads just crossed into overbought and a breakout regime — RSI 72.8 (up from 64.1), a +7.33% week (was +2.66%), +9.03% 30D, and now just -1.23% off its 52-week high (was -5.06%), with a +4.48% single day inside that week. $TMO extended further into the overbought territory it entered last cycle: RSI 70.3 (roughly flat from 71.0, still elevated), but the weekly print accelerated to +10.12% (was +6.72%), +13.82% 30D, still death-crossed even as the regime reads uptrend. $MRNA showed a mixed signal: RSI bounced to 40.3 (up from 36.7) and the weekly decline decelerated to -6.45% (was -12.54%), but it's now -34.81% off its 52-week high (was -33.39%) — a fresh distance-from-high low even as the pace of the drop eased. $VRTX reversed higher: RSI 56.7 (up from 49.2), 7D +1.74% (was -1.71%), though 30D turned slightly negative at -1.85% (was +0.45%) — still golden-crossed and now uptrend regime rather than the prior basing read. Source: full-scan pre-computed summaries as of the 2026-07-28 close — biotech; $AMGN is tracked in the broader biotech-scan bucket rather than the core biotech watchlist — biotech-scan.

• $AMGN — WATCH (downgraded from PROMOTE, extended): RSI 72.8 (up sharply from 64.1), -1.23% off 52wk high — the sector's steadiest name just crossed into overbought and a breakout regime; not a fresh entry at these levels.
• $TMO — PASS (further extended): RSI 70.3 (roughly flat, still overbought), +10.12% 7D (up from +6.72%) — the overbought call from last cycle just deepened rather than cooling off.
• $VRTX — WATCH (upgraded): RSI 56.7 (up from 49.2), regime now uptrend, +1.74% 7D — the earlier basing pattern resolved higher this cycle.
• $MRNA — PASS: RSI 40.3 (up from 36.7, decline decelerating), still -34.81% off 52wk high (a fresh low, was -33.39%) — the pace of the drop eased, but the chart hasn't turned.

Lead pick: $VRTX is the cleanest read this cycle — a reversal higher into an uptrend regime without the extension risk now attached to $AMGN and $TMO. $AMGN is the one to watch: five reads of "steadiest name in the sector" just turned into an overbought breakout at RSI 72.8, a print that needs to cool before it's a fresh add.

Sources

• Tape data (price/RSI/SMA/returns): full-scan pre-computed summaries as of the 2026-07-28 close — biotech ($MRNA, $VRTX, $TMO) and biotech-scan ($AMGN, tracked outside the core biotech watchlist).