# 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: 2026-08-29T13:47:19.606Z

## Summary

As of the most recent 13F filing period, CIENA CORP (CIEN) is held by 3 tracked superinvestors with an aggregate position value of $52.9M representing 010103840002800 shares.

## Top institutional holders (3)

| Rank | Manager | Fund | Shares | Value | % of Portfolio | Period |
|------|---------|------|--------|-------|----------------|--------|
| 1 | [Ray Dalio](https://superinvestorclub.com/manager/6) | Bridgewater Associates | 101038 | $49.6M | 0.20% | 2026-06-30 |
| 2 | [First Eagle](https://superinvestorclub.com/manager/21222) | First Eagle Investment Management | 4000 | $2.0M | 0.00% | 2026-06-30 |
| 3 | [Mairs & Power](https://superinvestorclub.com/manager/92) | Mairs & Power | 2800 | $1.4M | 0.01% | 2026-06-30 |

## Ownership history (quarter-over-quarter)

- 2023-06-30: 1 holders, $531,763 aggregate, 012515 shares
- 2023-09-30: 1 holders, $30.0M aggregate, 0635463 shares
- 2023-12-31: 1 holders, $28.2M aggregate, 0625936 shares
- 2024-03-31: 1 holders, $32,686 aggregate, 0661 shares
- 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: 4 holders, $14.7M aggregate, 011834947956105464000 shares
- 2025-09-30: 4 holders, $326.1M aggregate, 02006662161707674003000 shares
- 2025-12-31: 3 holders, $60.0M aggregate, 0212643409003000 shares
- 2026-03-31: 4 holders, $372.2M aggregate, 080952214384628002600 shares

## Recent congressional trades (7)

- 2026-05-29: Gilbert Cisneros (D-CA) purchase $1,001 - $15,000
- 2026-05-14: Gilbert Cisneros (D-CA) purchase $1,001 - $15,000
- 2025-10-31: Lisa McClain (Republican-MI) sale $1,001 - $15,000
- 2025-10-30: Lisa McClain (Republican-MI) sale $1,001 - $15,000
- 2025-10-30: Lisa McClain (Republican-MI) purchase $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."