How many institutional investors hold CIEN?

5 tracked institutional investors disclosed a position in CIEN (CIENA CORP) in their most recent 13F filing.

Who is the largest institutional holder of CIEN?

Ken Griffin, Citadel Advisors, holds the largest disclosed position in CIEN, valued at $325M.

Where does this CIEN ownership data come from?

SEC Form 13F-HR filings, accessed via EDGAR. 13F filings are disclosed quarterly with a 45-day reporting delay and cover U.S.-listed long equity positions only. This is not investment advice.

CIEN — CIENA CORP

Name: CIENA CORP (CIEN) — Institutional Ownership
Creator: InvestorLens
License: https://www.sec.gov/about/website-policies

Public company

For educational research only.InvestorLens analyzes public regulatory filings (SEC EDGAR, STOCK Act PTRs) that may be delayed by 45 days or more. Information shown is historical and is not financial, legal, or tax advice, nor a recommendation or solicitation to buy or sell any security. Always do your own research.

InvestorLens aggregates public filing data to show which tracked investors reported holdings in this stock. Dollar values represent reported position values, not market capitalization, and may be delayed up to 45 days. Not a recommendation.

Sourced from SEC EDGAR public filings

About CIENA CORP (CIEN)

CIENA CORP (CIEN) appears in the most recent 13F filings of 5 tracked institutional investors. The largest disclosed position is held by Ken Griffin (Citadel Advisors), valued at $325M. Across recent filings, tracked investors recorded 5 new positions, 1 increased, 2 reduced, and 0 exited. All data sourced from SEC 13F filings.

Smart Money Consensus™

Based on recent institutional activity in CIEN

/100

Institutional Accumulation

Added / Increased6

Reduced2

Exited0

BearishBullish

Crowded Trade Score™

How many top investors track CIEN

/100

Emerging Interest

5investors

A small number of top investors own this.

UndiscoveredCrowded

151015+

CIEN Ownership Composition

How CIENA CORP is held across tracked investor types, based on reported 13F positions.

Dominant Type

Other

73% of tracked value

Institutions

tracked investors

Total Reported

$1.1B

combined 13F value

Other73.3%
Hedge Funds26.7%

Other(4)

73.3%

Hedge Funds(1)

26.7%

Tracked investors reporting CIEN

Investor	Firm	Shares	Market value	% of portfolio	As of
Ken Griffin	Citadel Advisors	837.1K	$325M	0.05%	Mar 31, 2026
Steve Mandel	Lone Pine Capital	809.5K	$314.3M	2.51%	Mar 31, 2026
Steve Cohen	Point72 Asset Management	736.9K	$286.1M	0.37%	Mar 31, 2026
Izzy Englander	Millennium Management	236.1K	$91.7M	0.04%	Mar 31, 2026
Ray Dalio	Bridgewater Associates	143.8K	$55.8M	0.25%	Mar 31, 2026

Ken GriffinMar 31, 2026
Citadel Advisors
Shares
837.1K
Value
$325M
% Portfolio
0.05%
Steve MandelMar 31, 2026
Lone Pine Capital
Shares
809.5K
Value
$314.3M
% Portfolio
2.51%
Steve CohenMar 31, 2026
Point72 Asset Management
Shares
736.9K
Value
$286.1M
% Portfolio
0.37%
Izzy EnglanderMar 31, 2026
Millennium Management
Shares
236.1K
Value
$91.7M
% Portfolio
0.04%
Ray DalioMar 31, 2026
Bridgewater Associates
Shares
143.8K
Value
$55.8M
% Portfolio
0.25%

Recent activity

Investor	Action	Δ %	Current value	Filing date
Izzy Englander	New	—	$129.5M	Feb 17, 2026
Steve Cohen	New	—	$160.2M	Feb 17, 2026
Steve Mandel	New	—	$314.3M	May 15, 2026
Steve Cohen	New	—	$286.1M	May 15, 2026
Ray Dalio	Reduced	-32.35%	$55.8M	May 15, 2026
Ken Griffin	Reduced	-17.77%	$305.5K	Feb 17, 2026
Ray Dalio	Increased	31.50%	$49.7K	Feb 13, 2026
Ray Dalio	New	—	$23.6K	Nov 13, 2025

Izzy Englander
New
$129.5MFeb 17, 2026
Steve Cohen
New
$160.2MFeb 17, 2026
Steve Mandel
New
$314.3MMay 15, 2026
Steve Cohen
New
$286.1MMay 15, 2026
Ray Dalio
Reduced
$55.8M(-32.35%)May 15, 2026
Ken Griffin
Reduced
$305.5K(-17.77%)Feb 17, 2026
Ray Dalio
Increased
$49.7K(31.50%)Feb 13, 2026
Ray Dalio
New
$23.6KNov 13, 2025

Frequently asked questions

How many institutional investors hold CIEN?: 5 tracked institutional investors disclosed a position in CIEN (CIENA CORP) in their most recent 13F filing.
Who is the largest institutional holder of CIEN?: Ken Griffin, Citadel Advisors, holds the largest disclosed position in CIEN, valued at $325M.
Did institutional ownership of CIEN increase or decrease?: Across recent 13F filings, tracked investors recorded 5 new positions, 1 increased, 2 reduced, and 0 fully exited CIEN.
Where does this CIEN ownership data come from?: SEC Form 13F-HR filings, accessed via EDGAR. 13F filings are disclosed quarterly with a 45-day reporting delay and cover U.S.-listed long equity positions only. This is not investment advice.