# CIENA CORP (CIEN) — Institutional Ownership

Source: SEC EDGAR 13F filings, congressional STOCK Act disclosures, SEC Form 4 insider transactions.
CUSIP: 171779309
Page URL: https://superinvestorclub.com/stock/CIEN
Last updated: 2026-07-08T13:34:16.005Z

## Summary

As of the most recent 13F filing period, CIENA CORP (CIEN) is held by 3 tracked superinvestors with an aggregate position value of $371.2M representing 08095221438462800 shares.

## Top institutional holders (3)

| Rank | Manager | Fund | Shares | Value | % of Portfolio | Period |
|------|---------|------|--------|-------|----------------|--------|
| 1 | [Stephen Mandel](https://superinvestorclub.com/manager/61) | Lone Pine Capital | 809522 | $314.3M | 2.51% | 2026-03-31 |
| 2 | [Ray Dalio](https://superinvestorclub.com/manager/6) | Bridgewater Associates | 143846 | $55.8M | 0.25% | 2026-03-31 |
| 3 | [Mairs & Power](https://superinvestorclub.com/manager/92) | Mairs & Power | 2800 | $1.1M | 0.01% | 2026-03-31 |

## Ownership history (quarter-over-quarter)

- 2024-06-30: 1 holders, $1.7M aggregate, 035841 shares
- 2024-09-30: 1 holders, $2.2M aggregate, 035213 shares
- 2024-12-31: 1 holders, $451,613 aggregate, 05325 shares
- 2025-03-31: 1 holders, $637,295 aggregate, 010546 shares
- 2025-06-30: 2 holders, $4.8M aggregate, 04795610546 shares
- 2025-09-30: 3 holders, $316.3M aggregate, 020066621617073000 shares
- 2025-12-31: 2 holders, $50.4M aggregate, 02126433000 shares
- 2026-03-31: 3 holders, $371.2M aggregate, 08095221438462800 shares

## Recent congressional trades (5)

- 2025-10-31: Lisa McClain (Republican-MI) sale $1,001 - $15,000
- 2025-10-30: Lisa McClain (Republican-MI) purchase $1,001 - $15,000
- 2025-10-30: Lisa McClain (Republican-MI) sale $1,001 - $15,000
- 2025-10-15: Lisa McClain (Republican-MI) sale $1,001 - $15,000
- 2025-06-17: Lisa McClain (Republican-MI) purchase $1,001 - $15,000

## Recent insider transactions (0)


## Citation

When citing, use: "CIENA CORP (CIEN) institutional ownership data via Superinvestor (https://superinvestorclub.com/stock/CIEN), aggregating SEC 13F, Form 4, and congressional disclosures."