CIEN — CIENA CORP
Public company
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
Why are billionaires buying CIEN?
Built from public SEC filings and public economic data. Not a recommendation.
Why? — Evidence & Confidence ▾
Of 4 tracked investors who changed their CIEN position last quarter, 3 bought and 1 sold (75% buy-side). Macro conditions are mixed for this sector (Macro Tailwind 52/100 in a Squeeze regime). 4 congressional purchases, 0 sales disclosed in the last 6 months.
- +3 tracked investors added or increased positions last quarter (Paul Tudor Jones, Steve Mandel, Steve Cohen)
- +6 tracked investors reported holding CIEN at their latest filing
- +4 congressional purchases disclosed in the last 6 months
- −1 tracked investor reduced or exited last quarter (1 reduced, 0 sold out)
- −13F data is disclosed up to 45 days after quarter end — positions may have changed since
- · 13F disclosure lag (up to 45 days)
- · Tracked investors are a sample, not the whole market
- · Sector regime fit is a historical average, not a guarantee
Every InvestorLens score shows its evidence — including what argues against it. Model conviction-v1 · generated 8/4/2026.
About CIENA CORP (CIEN)
CIENA CORP (CIEN) appears in the most recent 13F filings of 6 tracked institutional investors. The largest disclosed position is held by Ken Griffin (Citadel Advisors), valued at $325M. Across recent filings, tracked investors recorded 7 new positions, 1 increased, 2 reduced, and 0 exited. All data sourced from SEC 13F filings.
Based on recent institutional activity in CIEN
How many top investors track CIEN
Several tracked investors have exposure.
CIEN Ownership Composition
How CIENA CORP is held across tracked investor types, based on reported 13F positions.
- Other73.9%
- Hedge Funds26.1%
Tracked investors reporting CIEN
- Ken GriffinMar 31, 2026Citadel AdvisorsShares837.1KValue$325M% Portfolio0.05%
- Steve MandelMar 31, 2026Lone Pine CapitalShares809.5KValue$314.3M% Portfolio2.51%
- Steve CohenMar 31, 2026Point72 Asset ManagementShares736.9KValue$286.1M% Portfolio0.37%
- Izzy EnglanderMar 31, 2026Millennium ManagementShares236.1KValue$91.7M% Portfolio0.04%
- Ray DalioMar 31, 2026Bridgewater AssociatesShares143.8KValue$55.8M% Portfolio0.25%
- Paul Tudor JonesMar 31, 2026Tudor Investment CorpShares57KValue$22.1M% Portfolio0.04%
Recent activity
- $37.7MFeb 17, 2026
- $22.1MMay 15, 2026
- $129.5MFeb 17, 2026
- New$160.2MFeb 17, 2026
- New$314.3MMay 15, 2026
- New$286.1MMay 15, 2026
- Reduced$55.8M(-32.35%)May 15, 2026
- Reduced$305.5K(-17.77%)Feb 17, 2026
- Increased$49.7K(31.50%)Feb 13, 2026
- New$23.6KNov 13, 2025
Frequently asked questions
- How many institutional investors hold CIEN?
- 6 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 7 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.