$CIEN

$335.93 +$15.67 (4.89%) Close

$CIEN Overview Financial Statements SEC Filings Executives News Red Flags Capital Raising Ownership Insider Transactions Congressional Trades

Ownership

13F as of Q2 2026 · 141.8M shares outstanding

Who owns CIEN?

By type of holder

Institutions 93.1% Insiders 1.2% Everyone else 5.7%

Concentration Top 10 holders own 54.8%

FMR LLC 13.5% · BlackRock, Inc. 9.0%

Institutional ownership

93.1%

-1.6 pts vs last qtr

Institutional holders

1,221

+136 vs last qtr

Net shares bought

−2.2M

by institutions in Q2 2026

New / sold out

259 / 123

positions opened vs closed

How is ownership changing?

Institutions, last 8 quarters

Biggest buyers in Q2 2026

Norges Bank NEW +1.7M
American Century Companies Inc +1.3M

Biggest sellers in Q2 2026

FMR LLC −2.1M
Capital Research Global Investors −2.1M

Who is planning to sell?

Notices of proposed sale, last 12 months

$97.6M

53 notices from 12 people

Shares covered

311.1K

0.22% of the company

Arranged in advance

97%

of the value is under a 10b5-1 plan

Under a 10b5-1 plan No plan

Largest proposed sellers

Gary B. Smith Officer 10b5-1 $44.5M
Jason Phipps Officer 10b5-1 $16.5M

Every notice on Red Flags →

A Form 144 is notice of a planned sale, not the sale itself. What insiders actually sold is on Insider Transactions.

Is your stake being diluted?

Diluted share count, FY2016–FY2025

−3.6%

−0.41% a year

Each share's claim on the business

+3.8%

grew without buying or selling a share

Spent on buybacks vs paid in stock

$1.76B vs $942M

over 10 fiscal years

Diluted shares, split-adjusted

Buybacks Stock-based comp

How patient are the owners?

Institutional shares by how long they've been held

5+ years79% 3–5 years1% 1–3 years10% Under 1 year10%

Quarterly turnover

11.9%

of institutional shares changed hands

Top 10 managers, median time held

5 years

Super Investors

Investment managers reporting CIEN on Form 13F

Holder	Shares	% of company	Change vs last qtr	Held since	% of their book
F FMR LLC	19.1M	13.48%	−2.1M (−9.9%)	≤2021	0.4%
Shares held by quarter Peak holding21.7M (Q3'24) Change over 8 quarters−2.6M Share of the company13.480% FMR LLC's full portfolio →
B BlackRock, Inc.	12.7M	8.97%	−655.3K (−4.9%)	≤2021	0.1%
Shares held by quarter Peak holding17.1M (Q4'24) Change over 8 quarters−3.4M Share of the company8.970% BlackRock, Inc.'s full portfolio →

FMR LLC

19.1M

% of company

13.48%

Change vs last qtr

−2.1M (−9.9%)

Held since

≤2021

BlackRock, Inc.

12.7M

% of company

8.97%

Change vs last qtr

−655.3K (−4.9%)

Held since

≤2021

28 more super investors behind a free account

See every manager holding Ciena Corporation, how their position has changed, and how long they've held it.

Institutional Funds

Mutual funds and ETFs reporting CIEN on Form N-PORT; together they hold 44.7% of the company

Fund	Position value	Shares	% of company	% of the fund	As of
VT Vanguard Total Stock Market Index Fund Vanguard Index Funds	$2.2B	4.5M	3.17%	0.10%	June 30, 2026
JL JPMorgan Large Cap Growth Fund JPMorgan Trust II	$2.11B	4.3M	3.04%	1.73%	June 30, 2026

Vanguard Total Stock Market Index Fund

Vanguard Index Funds

Position value

$2.2B

% of company

3.17%

% of the fund

0.10%

As of

June 30, 2026

JPMorgan Large Cap Growth Fund

JPMorgan Trust II

Position value

$2.11B

% of company

3.04%

% of the fund

1.73%

As of

June 30, 2026

23 more funds behind a free account

See every fund holding Ciena Corporation and how much of the fund the position is.

Insiders and 5%+ holders

From Forms 3/4/5 and Schedules 13D/G

Holder	Shares	% of company	Change vs last qtr	8 quarters	Held since	% of their book
MJ Moylan James E JR Insider	377.2K	0.27%	—	—	—	—
Insider holdings come from Form 3/4/5 filings, which are not quarterly. Share of the company0.270% Moylan James E JR's insider activity →
SG Smith Gary B Insider	225.5K	0.16%	—	—	—	—
Insider holdings come from Form 3/4/5 filings, which are not quarterly. Share of the company0.160% Smith Gary B's insider activity →

Moylan James E JR

Insider

377.2K

% of company

0.27%

Change vs last qtr

—

Held since

—

Smith Gary B

Insider

225.5K

% of company

0.16%

Change vs last qtr

—

Held since

—

18 more holders behind a free account

See every insider and 5%+ holder of Ciena Corporation.

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