Decline depth
-57.4%
From rolling 252-day high of $44.28, 108d ago.
Past the 40% Red List threshold.
-57.4%
from rolling 252-day high of $44.28 set 2026-01-26 · 108d ago
Current
$18.88
Decline depth
-57.4%
Decline σ
5.5σ
TFC
2/5 bearish
Rolling 252-day high
Up day
Down day
Last 90 trading days · data from Alpaca
Structural break signals
CSTL qualifies for the Red List on decline depth.
Time-frame continuity
2/5 bearish
Latest bar across daily/weekly/monthly/quarterly/yearly time frames. A bar counts as bearish when it's a 2-Down or a red 3.
Decline sigma
5.5σ
Drop from local high over the last 20 bars, expressed in units of the stock's typical daily volatility (5.68% per day).
Past the ≥4σ Watch threshold.
The structural read
What price action says about CSTL.
CSTL qualifies for the Red List on decline depth — down -57.4% 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 5.5σ over 20 bars.
Earnings on file: 2026-02-26. Tiering is unaffected by earnings dates — listings reflect price structure only.
52-week range
52W low $14.59
14.4% of range
52W high $44.28
Sector context · Healthcare
182 other Healthcare tickers are on Broken Stocks.
92
Red List
43
Amber
47
Watch
-35.8%
Median decline
Worst in sector: OPRX (-76.7%). Least-bad: ANIP (-20.0%). See all Healthcare listings →
Related — same sector
Closest decliners to CSTL
Red List Recovering
CLPT
ClearPoint Neuro Inc.
Red List
ZBIO
Zenas BioPharma, Inc.
Red List
SRPT
Sarepta Therapeutics, Inc.
Red List
SPRY
ARS Pharmaceuticals, Inc.
Red List
PODD
Insulet Corporation
Red List
TEM
Tempus AI, Inc.
Questions about CSTL
What people ask.
Why is CSTL on Broken Stocks?
CSTL qualifies for the Red List on decline depth. It is down -57.4% from its rolling 252-day high of $44.28, set on 2026-01-26 — 108d ago.
Is CSTL a falling knife?
By the most common technical definition — a steep, recent breakdown from a fresh high — yes. CSTL is down -57.4% from its 52-week high of $44.28, set 108d 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 CSTL 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 CSTL trading inside its 52-week range?
At $18.88, CSTL sits 14.4% of the way from its 52-week low ($14.59) to its 52-week high ($44.28). A reading below 25% indicates price is hugging the bottom of the range; above 75%, the top.
How fast has CSTL been declining?
The current 57.4% decline accrued over 108d, which annualizes to roughly -194.0% 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 CSTL compare to its sector?
There are 182 other Healthcare tickers on Broken Stocks: 92 Red, 43 Amber, 47 Watch, with 55 showing recovering structural signals. Median sector decline is -35.8% — CSTL's decline is deeper than the sector median.
Does CSTL'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 (2026-02-26) is shown for reference only — listings can move tier between scans based on closing prices, regardless of fundamentals or news events.