Who owns CIEN? 13F holders and whale ownership
CIEN is tracked across public portfolios in Whale Analyzer. This page answers who owns CIEN, which top funds are buying CIEN, aggregate disclosed value, and recent position changes based on public data. Stephen Mandel is the largest reported holder at $314M; the top five funds control 100.0% of reported ownership; institutions were net selling last quarter (1 increased, 3 reduced). Top tracked holders include Stephen Mandel, Gavin Baker, Whale Rock Capital, and Ray Dalio.
Continue to the live CIEN dashboardTop holders
| Investor | Reported value | Shares | Change |
|---|---|---|---|
| Stephen Mandel 13F portfolio Lone Pine Capital holdings | $314.3M | 809.5K | New |
| Gavin Baker 13F portfolio Atreides Management holdings | $262.8M | 676.8K | Reduced |
| Whale Rock Capital 13F portfolio Whale Rock Capital Management holdings | $89.8M | 231.3K | Reduced |
| Ray Dalio 13F portfolio Bridgewater Associates holdings | $55.8M | 143.8K | Reduced |
Ownership concentration
Reported ownership of CIEN is highly concentrated across tracked institutions.
- Single largest holder: 43.5% of reported ownership
- Top 5 holders: 100.0%
- Top 10 holders: 100.0%
Whale activity this quarter
Across 4 tracked institutions, 3 reduced, 1 increased. Net positioning is net selling.
- Gavin Baker — Atreides Management ($262.8M) (▼ 52.6% qoq shares)
- Whale Rock Capital — Whale Rock Capital Management ($89.8M) (▼ 74.1% qoq shares)
- Ray Dalio — Bridgewater Associates ($55.8M) (▼ 32.4% qoq shares)
Sector positioning — Information Technology
CIEN sits within the Information Technology sector alongside 131 other tracked names. Compare whale ownership across peers:
How to use this page
Values are reported public positions from tracked 13F filers and disclosures — not real-time ownership totals. Open the live CIEN dashboard for price charts and cross-investor scans, or read the SEC 13F guide.
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Learn more in Whale Analyzer Academy
Deepen your read on CIEN with these Whale Analyzer Academy guides:
Frequently asked questions
Who owns CIEN stock?
Whale Analyzer tracks 4 public institutional holders of CIEN with a combined reported value of $722.7M. See the holder table above for the largest tracked positions.
Which top funds are buying CIEN?
Tracked institutions were net selling last quarter — 3 reduced, 1 increased. Check the "Change" column: "New" = fresh position, "Increased" = added, "Reduced" = trimmed.
How concentrated is CIEN ownership?
The top five tracked holders report 100.0% of aggregate ownership.
What does 13F ownership mean for CIEN?
Use the interactive CIEN dashboard on Whale Analyzer for real-time holder analysis, or read our 13F Alpha Signals Guide.