Decline depth
-41.5%
From rolling 252-day high of $193.78, 87d ago.
Past the 40% Red List threshold.
Red List
ACLSAxcelis Technologies, Inc.
Technology · Semiconductor Equipment & Materials · mid-cap ($3.7B)
-41.5%
from rolling 252-day high of $193.78 set 2026-06-15 · 87d ago
Current
$113.30
Decline depth
-41.5%
Decline σ
7.4σ
TFC
0/5 bearish
Rolling 252-day high
Up day
Down day
Last 90 trading days · data from Alpaca
Since it joined the list
$ACLS landed on the list 2026-03-08, down 18.3% from its 52-week high that day — now down -41.5%.
It has clawed back 28.5 percentage points off that level. It bottomed 19.2% below that high along the way.
From the 52-week high as of 2026-03-09 to today. Split-adjusted. Observed, not a forecast.
Structural break signals
ACLS qualifies for the Red List on decline depth.
Time-frame continuity
0/5 bearish
Latest bar on five time frames, daily to yearly. Bearish = 2-Down or red 3.
Decline sigma
7.4σ
Drop over the last 20 bars in units of daily volatility (3.24%/day).
Past the ≥6σ Amber threshold.
The structural read
What price action says about ACLS.
ACLS qualifies for the Red List on decline depth — down -41.5% from its rolling 252-day high. Past the 40% threshold, the deepest tier in the taxonomy. Depth plus recency: this is the pattern many investors call a falling knife.
Cross-confirmation: decline sigma also reads 7.4σ over 20 bars.
Earnings on file: 2026-08-06. Earnings dates don't affect tiering.
Questions about ACLS
What people ask.
Why is ACLS on Broken Stocks?
ACLS qualifies for the Red List on decline depth. It is down -41.5% from its rolling 252-day high of $193.78, set on 2026-06-15 — 87d ago.
Is ACLS a falling knife?
By the most common technical definition — a steep, recent breakdown from a fresh high — yes. ACLS is down -41.5% from its 52-week high of $193.78, set 87d ago. That combination of depth (past the 30% Amber threshold) and recency (high set inside the last 120 days) is the textbook falling-knife pattern. Whether to try to catch it is a separate question — historically most attempts to bottom-pick continue lower before reversing. Broken Stocks flags the pattern; it does not recommend buying or selling.
Is ACLS a buy?
Broken Stocks does not issue buy or sell recommendations. The list is a rules-based technical warning system. It tracks structural decline depth and recency — not company quality, management, fundamentals, or news. Always do your own research and consult a licensed advisor.
Where is ACLS trading inside its 52-week range?
At $113.30, ACLS sits 37.2% of the way from its 52-week low ($65.64) to its 52-week high ($193.78). A reading below 25% indicates price is hugging the bottom of the range; above 75%, the top.
How fast has ACLS been declining?
The current 41.5% decline accrued over 87d, which annualizes to roughly -174.1% per year. Annualized pace is a sanity check — a 30% decline in three months is a different signal than a 30% decline over two years.
How does ACLS compare to its sector?
There are 455 other Technology tickers on Broken Stocks: 308 Red, 92 Amber, 55 Watch, with 49 showing recovering structural signals. Median sector decline is -40.5% — ACLS's decline is deeper than the sector median.
Does ACLS's earnings date affect its tier?
No. Tiering is decided purely by decline depth and recency of the rolling-high date. The earnings date on file (2026-08-06) is shown for reference only — listings can move tier between scans based on closing prices, regardless of fundamentals or news events.