Decline depth
-40.6%
From rolling 252-day high of $637.51, 48d ago.
Past the 40% Red List threshold.
Red List
CIENCiena Corporation
-40.6%
from rolling 252-day high of $637.51 set 2026-06-03 · 48d ago
Current
$400.92
Decline depth
-40.6%
Decline σ
4.6σ
TFC
0/5 bearish
Rolling 252-day high
Up day
Down day
Last 90 trading days · data from Alpaca
Since it joined the list
$CIEN landed on the list 2026-07-02, down 33.7% from its 52-week high that day — now down -40.6%.
That's 2.2 percentage points deeper than the day it joined. It bottomed 41.3% below that high along the way.
Decline from the 52-week high as it stood on 2026-07-02 (fixed anchor) → today. Split-adjusted, Alpaca. Observed history, not a forecast.
Structural break signals
CIEN qualifies for the Red List on decline depth.
Time-frame continuity
0/5 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
4.6σ
Drop from local high over the last 20 bars, expressed in units of the stock's typical daily volatility (4.3% per day).
Past the ≥4σ Watch threshold.
The structural read
What price action says about CIEN.
CIEN qualifies for the Red List on decline depth — down -40.6% 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 4.6σ over 20 bars.
52-week range
52W low $359.01
15.0% of range
52W high $637.51
Related — same sector
Closest decliners to CIEN
Questions about CIEN
What people ask.
Why is CIEN on Broken Stocks?
CIEN qualifies for the Red List on decline depth. It is down -40.6% from its rolling 252-day high of $637.51, set on 2026-06-03 — 48d ago.
Is CIEN a falling knife?
By the most common technical definition — a steep, recent breakdown from a fresh high — yes. CIEN is down -40.6% from its 52-week high of $637.51, set 48d 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 CIEN 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 CIEN trading inside its 52-week range?
At $400.92, CIEN sits 15.0% of the way from its 52-week low ($359.01) to its 52-week high ($637.51). A reading below 25% indicates price is hugging the bottom of the range; above 75%, the top.
How fast has CIEN been declining?
The current 40.6% decline accrued over 48d, which annualizes to roughly -308.7% 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.