Historical position

George Soros’s Ciena (CIEN) position

Reported position history, portfolio importance and verified filing changes from public SEC disclosures.

Soros Fund ManagementVerified through Q2 2026
Relationship snapshot

At a glance

The full verified relationship, including prior ownership episodes and exits where supported.

First reportedQ2 2007Earliest verified positive filing snapshot
Latest statusHistorical positionBased on the latest supported relationship state
Peak shares1.22MHighest verified quarter-end share count
Quarters reported14Verified quarters with shares above zero
What happened?

Soros Fund Management first reported Ciena in Q2 2007. The reported position was increased and reduced across later filings. Verified positive position history runs through Q1 2014. The current relationship status cannot be determined reliably from supported data.

Verified SEC history

Position over time

See the same verified relationship through reported shares, portfolio weight or reported value.

Metric

Gaps indicate periods that cannot be safely connected or where a verified corporate action changes the raw share scale. Stock price, when available, is market context and not a transaction price.

Key filing events

What changed

Latest filing plus the most meaningful reported changes. Unchanged quarters are collapsed by default.

Q2 2014
Sold the entire position−1.22M shares · No shares reported at quarter-end
Q1 2014
Bought 74.7% more+523.00K shares · 1.22M shares reported after the change
Filing context

Quarter-end price $22.74 · Estimated holding basis $23.42

Q4 2013
New position+700.00K shares · 700.00K shares reported
Filing context

Quarter-end price $23.93 · Estimated holding basis $23.93

Q2 2013
Sold the entire position−150.00K shares · No shares reported at quarter-end
Q1 2013
Bought 4.0% more+5.80K shares · 150.00K shares reported after the change
Filing context

Quarter-end price $16.01 · Estimated holding basis $15.72

Q4 2012
New position+144.20K shares · 144.20K shares reported
Filing context

Quarter-end price $15.71 · Estimated holding basis $15.71

1 unchanged quarter is collapsed by default.

Portfolio importance

How important was Ciena in Soros Fund Management’s reported portfolio?

Relative importance is measured only within the verified primary non-option reported portfolio for each quarter.

Last reported portfolio weight0.3%Q1 2014
Last reported rank#82of 292 reported positions
Peak portfolio weight0.6%Q3 2007
Best historical rank#42Q3 2007
At peak importanceQ3 2007
CIEN
0.6%
Largest holding
18.9%
Cross-investor discovery

Who else owns Ciena?

Also reported by 2 other tracked investors in their latest verified filings.

Ray DalioBridgewater Associates, LP
CIEN0.2% of reported portfolio
Joel GreenblattGotham Asset Management
CIEN0.1% of reported portfolio
Explore Ciena across all tracked investors →
MarketInsiderLab research

Connected research on Ciena

Only published MIL research mapped to the exact stock identity is shown here.

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SEC evidence & methodology

SEC filing evidence

Market context and filing-derived values are kept separate from actual transaction prices, which 13F filings do not disclose.

Latest verified stock price$349.542026-09-11

Market context only; not an investor transaction price.

Latest verified investor filingQ2 2026 · filed 2026-08-14
Open SEC filing ↗

View Ciena stock page →

This tracker follows Soros Fund Management LLC’s Form 13F disclosures—not George Soros’s personal brokerage account. George Soros founded the firm; its current CEO and chief investment officer is Dawn Fitzpatrick. Form 13F does not reveal exact trade dates, execution prices or the purpose of an option position.