Ciena (CIEN) Held by Superinvestors
CIENA CORP (CIEN) is currently held by 4 superinvestors tracked by InsiderSet, with a combined reported market value of approximately $96.66M based on the latest available SEC Form 13F filings for the quarter ended June 30, 2026.
Renaissance Technologies LLC is currently the largest disclosed institutional shareholder of CIEN tracked by InsiderSet, reporting ownership valued at approximately $90.64M in its June 30, 2026 SEC Form 13F filing. Based on current market prices and the latest disclosed share count, the position is now estimated to be worth approximately $59.18M, representing an estimated loss of -34.72% since the filing period.
The top 10 institutional shareholders tracked on this page collectively account for approximately 100% of the total disclosed CIEN value among the investors covered in this analysis. Major shareholders include Renaissance Technologies LLC, Sequoia Financial Advisors, Mairs & Power Growth Fund, and several other long-term asset managers with concentrated positions in CIENA CORP (CIEN).
This page ranks the largest institutional CIEN shareholders using publicly disclosed SEC Form 13F data, including reported values, estimated current holding values, portfolio allocation percentages, ownership concentration metrics, and historical holding changes across major hedge funds and investment firms.
| Name | Investor/Manager | Portfolio % | Quantity | Reported Balance | Current Estimated Value | Gain/loss Since Filing | Estimated Portfolio Performance |
|---|---|---|---|---|---|---|---|
| Renaissance Technologies LLC | Jim Simons | 0.12% | 184,774 | $90,642,733 | $59,175,721 | -$31,467,012 | -34.72% |
| Sequoia Financial Advisors | 0.02% | 7,463 | $3,661,050 | $2,390,100 | -$1,270,950 | -34.72% | |
| Mairs & Power Growth Fund | Andrew R. Adams | 0.01% | 2,800 | $1,373,568 | $896,728 | -$476,840 | -34.72% |
| First Eagle U.S. Value | Jean-Marie Eveillard | 0.00% | 2,000 | $981,120 | $640,520 | -$340,600 | -34.72% |
Frequently asked questions about CIEN
Who are the largest superinvestors holding CIEN?
The largest superinvestors holding CIEN in the latest SEC Form 13F filings include Renaissance Technologies LLC, Sequoia Financial Advisors, Mairs & Power Growth Fund, and First Eagle U.S. Value. InsiderSet ranks these superinvestors by their latest reported CIEN position.
What does the CIEN superinvestors page include?
This page tracks CIEN positions reported by a curated group of notable institutional investors and fund managers through SEC Form 13F. CIENA CORP (CIEN) on this page reflects disclosed 13F holdings among those superinvestors, not every institutional shareholder of the stock.
How many superinvestors hold CIEN?
InsiderSet currently tracks 4 superinvestors reporting CIEN holdings in the latest available 13F data. This is the curated set on this page, not the total number of institutions that own CIEN.
How much CIEN stock do superinvestors hold?
Superinvestors tracked by InsiderSet disclosed approximately $96.66M in CIEN holdings for Q2 2026. This figure is reported 13F value as of the filing period, not necessarily today's market value, and it covers the curated superinvestors on this page rather than every institutional filer.
When were CIEN superinvestor holdings last updated?
The latest CIEN superinvestor holdings on InsiderSet are based on SEC Form 13F filings for the quarter ended June 30, 2026. Form 13F filings are generally reported after the quarter ends, so the holdings shown represent the latest publicly disclosed positions rather than real-time holdings.
Are superinvestor CIEN holdings real-time?
No. Form 13F data is not real-time. It represents positions reported by these superinvestors as of the end of the reporting quarter. A superinvestor may have changed its CIEN position after the reporting date.
Are superinvestors buying or selling CIEN?
Buying and selling can be analyzed by comparing CIEN positions across consecutive 13F reporting periods. InsiderSet's CIEN Ownership Changes page shows institutions that increased, reduced, initiated, or exited positions based on reported 13F holdings. View CIEN ownership changes.
How have superinvestor CIEN holdings changed over time?
InsiderSet tracks CIEN holdings among these superinvestors across multiple 13F reporting periods, so holder counts, reported value, and reported shares can be compared over time.