What is CIEN's market cap?

$38.61B, based on the Nov 4 close of $272.24.

What is CIEN's P/E ratio?

59.0× trailing-twelve-month earnings of $654.41M.

Does Ciena pay a dividend?

No regular cash dividend has been paid in the last year.

How much of CIEN is sold short?

4.0M shares, 2.8% of float, as of Oct 15, 2026.

What sector is CIEN in?

Technology, in the Telephone Equipment industry.

NYSE · CIENTechnologyTelephone Equipment

Ciena Corporation (CIEN)

$272.24−9.28%

Close Nov 4, 2026 · split-adjusted

Nov 3, 2026$300.08▲ 58.30% in range

Nov 3, 2025Low $176.45 · High $627.00Nov 3, 2026

What changed · written from our data

As of Nov 4, 2026

Ciena closed at $272.24 on Nov 4, down 9.28%, 56.6% below its 52-week closing high. Volume of 3.9M shares was 1.24× its 20-day average (close to normal).

Split-adjusted performance: -38.6% over one month, -52.8% over six months, +43.6% over one year.

In the quarter ended Aug 1, 2026, revenue was $1.67B, up 37.0% from a year earlier, with a net margin of 15.9%.

Short interest was 4.0M shares at the Oct 15 settlement, up 3.0% from the prior report (2.8% of float, 1.2 days to cover).

Market cap$38.61B141.8M shares

Revenue · quarter$1.67B+37.0% YoY

Diluted EPS$1.83+422.9% YoY

P/E · TTM59.0×P/S 6.4×

Net margin15.9%Gross 45.4%

Dividend yieldNone

52-week range176.45 – 627.00−56.6% from high

Volume3.9M1.24× 20-day avg

Volatility · 60d88.3%Annualised

Short % of float2.8%1.2 days to cover

Net cash-$599.8MCash $2.63B

Next earnings—Not scheduled

Split-adjusted performance

1W −25.0%1M −38.6%3M −32.6%6M −52.8%YTD +16.4%1Y +43.6%3Y +563.0%5Y +407.3%

Earnings reactions

History →

No reported quarters with price history yet.

Rank within Telephone Equipment

Percentile among 8 companies (100 = best)

6-month momentum14

Revenue growth—

Net margin—

Value (low P/E)—

Size100

Industry medians: 6-month return −50.4%, revenue growth +21.2%, net margin 6.9%, P/E 25.5×.

Short interest

Details →

Shares short4.0M+3.0% vs prior

Days to cover1.2Settled Oct 15

% of float2.8%

Short vol. 10d49.3%of daily volume

Closest peers by size in Telephone Equipment

Company	Price	Today	6M	Rev. growth	Net margin	P/E	Mkt cap
CIENCiena	$272.24	−9.28%	−52.8%	+37.0%	15.9%	59.0	$38.61B
FNFabrinet	$341.64	−5.97%	−49.7%	+50.7%	7.0%	25.5	$12.24B	Compare
CLFDClearfield	$32.88	+0.86%	+8.6%	+13.2%	6.8%	—	$446.6M	Compare
ADTNADTRAN Holdings	$4.73	−6.52%	−69.9%	+6.1%	−3.7%	—	$385.4M	Compare
FIEEFiEE	$3.06	+8.90%	−51.7%	—	31.7%	7.5	$26.1M	Compare
FKWLFranklin Wireless	$2.12	−1.40%	−39.6%	+21.2%	−51.9%	—	$25.0M	Compare
CLROClearOne	$5.00	−9.91%	+53.4%	—	—	—	$13.4M	Compare
SONMDNA X	$2.57	+1.98%	−51.1%	—	—	—	$3.8M	Compare

News about Ciena

All news →

Ciena Up 56% in a Year: Should Investors Buy the Stock Now?Zacks Investment Research · 2d ago▲ Positive Ciena vs. Nokia: Which Optical Networking Stock is the Better Buy?Zacks Investment Research · Oct 23, 2026▲ Positive Ciena's Openreach Deal: Can 1.6Tb/s Technology Drive Its Growth?Zacks Investment Research · Oct 9, 2026▲ Positive Stock Market News for Oct 7, 2026Zacks Investment Research · Oct 7, 2026▲ Positive Zacks Industry Outlook Ciena, Viavi and OomaZacks Investment Research · Oct 7, 2026▲ Positive

Quick answers

What does Ciena do?: Ciena is a leader in high-speed optical connectivity, providing systems, components, and automation software for telecom providers and enterprises, such as data centers, to enable long-distance connectivity. The company operates through four primary business segments: networking platforms, platform software and services, Blue Planet automation software, and global services.
What is CIEN's market cap?: $38.61B, based on the Nov 4 close of $272.24.
What is CIEN's P/E ratio?: 59.0× trailing-twelve-month earnings of $654.41M.
Does Ciena pay a dividend?: No regular cash dividend has been paid in the last year.
How much of CIEN is sold short?: 4.0M shares, 2.8% of float, as of Oct 15, 2026.
What sector is CIEN in?: Technology, in the Telephone Equipment industry.

About Ciena

Ciena is a leader in high-speed optical connectivity, providing systems, components, and automation software for telecom providers and enterprises, such as data centers, to enable long-distance connectivity. The company operates through four primary business segments: networking platforms, platform software and services, Blue Planet automation software, and global services. While telecom carriers remain important customers, cloud providers and hyperscalers now drive a significant portion of the business. To meet the demands of AI data centers, customers are adopting Ciena's WaveLogic 6 platform, the first to support 1.6 terabits-per-second capacity.

HQ: Hanover, MD9,080 employeesListed Feb 7, 1997ciena.com

Sources: Massive / Polygon daily aggregates (split-adjusted) · SEC filings via Massive · FINRA settlements via Massive · Financial Modeling Prep. Figures are dated where shown; research is informational, not investment advice. Methodology