Who owns Ciena (CIEN)
Which tracked institutional funds hold CIEN, how they are positioned, and who is buying versus exiting — from SEC Form 13F-HR filings. See CIEN company fundamentals →
Ownership as of the 2026-Q2 13F filings (latest filed 2026-09-22). 13F is disclosed up to 45 days after quarter-end, so the most recent quarter fills in over the following weeks.
How the tape is positioned
521 tracked funds added or opened CIEN while 210 trimmed or exited it between 2026-Q1 and 2026-Q2 — the tape is split. When large holders disagree on a name, the funds moving first are sometimes ahead of the story.
A prompt to read the filings, not a verdict. 13F is a quarter-end snapshot disclosed up to 45 days late; a fund adds or exits for mandate, benchmark, and timing reasons that have nothing to do with a view on the stock. This is a starting question, not a signal to trade.
Conviction spread
CIEN’s largest tracked holder by dollar value, FMR LLC, sizes it at 0.4% of its own reported 13F book, while the median holder sizes it at 0.1% of theirs — a 0.3pp conviction gap — its largest holder concentrates the name more heavily than the typical one.
Book-share is each fund’s reported value in CIEN divided by its whole reported 13F book, so it is comparable across funds of different sizes and is unaffected by stock splits. A higher share means a fund has committed more of its book to the name — a starting question about conviction, not a verdict or a signal to trade.
Institutional & insider positioning
Between 2026-Q1 and 2026-Q2, across 1157 tracked filers holding CIEN, 696 increased or opened the position and 533 reduced or closed it; over the same quarter, open-market insider Form 4s were net sales.
This fuses two public signals for the same quarter — how tracked institutions changed their positions and whether insiders bought or sold in the open market. It describes what was filed; it is a starting question, not a verdict or a signal to trade.
New buyers & exits
Funds opening or closing a position in CIEN between the 2026-Q1 and 2026-Q2 13F filings, and the largest changes among funds holding it in both. New buyers and exits are counted on fund presence (split-invariant); adds and trims are measured on reported value.
New buyers 114
- Qube Research & Technologies Ltd$139M
- Alyeska Investment Group, L.P.$108M
- BIT Capital GmbH$83M
- Altshuler Shaham Ltd$58M
- CAXTON ASSOCIATES LLP$58M
- PFA Pension, Forsikringsaktieselskab$47M
Full exits 106
- LONE PINE CAPITAL LLC$314M
- Polar Capital Holdings Plc$310M
- Amundi$167M
- T. Rowe Price Investment Management, Inc.$162M
- ACADIAN ASSET MANAGEMENT LLC$128M
- JANUS HENDERSON GROUP PLC$97M
Largest adds
- BlackRock, Inc.$1.8B
- JPMORGAN CHASE & CO$1.6B
- FMR LLC$1.1B
- VANGUARD CAPITAL MANAGEMENT LLC$970M
- VANGUARD PORTFOLIO MANAGEMENT LLC$907M
- NORGES BANK$831M
Largest trims
- Capital Research Global Investors$745M
- Jericho Capital Asset Management L.P.$368M
- Anatole Investment Management Ltd$120M
- VOYA INVESTMENT MANAGEMENT LLC$109M
- Point72 Asset Management, L.P.$108M
- WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC$89M
Institutional holders
One row per tracked fund, most shares held first (every row is from one quarter; reported value breaks ties). “% of value” is the fund’s share of this security’s tracked institutional value — not of shares outstanding.
| Fund | Shares | Reported value | % of value | Quarter |
|---|---|---|---|---|
| FMR LLC trimmed | 19,113,538 | $9.4B | 16.3% | 2026-Q2 |
| BlackRock, Inc. added | 12,718,494 | $6.2B | 10.8% | 2026-Q2 |
| JPMORGAN CHASE & CO added | 11,206,209 | $5.4B | 9.3% | 2026-Q2 |
| VANGUARD CAPITAL MANAGEMENT LLC added | 9,233,803 | $4.5B | 7.9% | 2026-Q2 |
| VANGUARD PORTFOLIO MANAGEMENT LLC added | 7,680,665 | $3.8B | 6.5% | 2026-Q2 |
| STATE STREET CORP added | 6,680,578 | $3.3B | 5.7% | 2026-Q2 |
| PRICE T ROWE ASSOCIATES INC /MD/ trimmed | 4,071,401 | $2.0B | 3.5% | 2026-Q2 |
| GEODE CAPITAL MANAGEMENT, LLC trimmed | 3,370,462 | $1.6B | 2.9% | 2026-Q2 |
| AMERICAN CENTURY COMPANIES INC added | 1,851,788 | $908M | 1.6% | 2026-Q2 |
| BANK OF AMERICA CORP /DE/ trimmed | 1,788,582 | $877M | 1.5% | 2026-Q2 |
| Capital World Investors added | 1,755,602 | $861M | 1.5% | 2026-Q2 |
| Invesco Ltd. added | 1,730,210 | $849M | 1.5% | 2026-Q2 |
| NORGES BANK added | 1,703,155 | $835M | 1.5% | 2026-Q2 |
| ARROWSTREET CAPITAL, LIMITED PARTNERSHIP added | 1,677,029 | $823M | 1.4% | 2026-Q2 |
| MORGAN STANLEY added | 1,634,630 | $802M | 1.4% | 2026-Q2 |
| Nuveen, LLC added | 1,391,429 | $683M | 1.2% | 2026-Q2 |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC trimmed | 1,248,995 | $613M | 1.1% | 2026-Q2 |
| NORTHERN TRUST CORP added | 1,217,939 | $597M | 1.0% | 2026-Q2 |
| DIMENSIONAL FUND ADVISORS LP added | 1,153,229 | $566M | 1.0% | 2026-Q2 |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC added | 1,145,480 | $562M | 1.0% | 2026-Q2 |
| BNP PARIBAS ASSET MANAGEMENT Holding S.A. added | 1,105,383 | $542M | 0.9% | 2026-Q2 |
| AQR CAPITAL MANAGEMENT LLC added | 1,052,165 | $507M | 0.9% | 2026-Q2 |
| GOLDMAN SACHS GROUP INC added | 946,611 | $464M | 0.8% | 2026-Q2 |
| Legal & General Group Plc added | 887,054 | $435M | 0.8% | 2026-Q2 |
| Bank of New York Mellon Corp trimmed | 825,480 | $405M | 0.7% | 2026-Q2 |
| VANGUARD FIDUCIARY TRUST CO added | 812,345 | $399M | 0.7% | 2026-Q2 |
| VOYA INVESTMENT MANAGEMENT LLC trimmed | 731,614 | $359M | 0.6% | 2026-Q2 |
| Atreides Management, LP added | 688,521 | $338M | 0.6% | 2026-Q2 |
| Capital Research Global Investors trimmed | 656,554 | $322M | 0.6% | 2026-Q2 |
| MASSACHUSETTS FINANCIAL SERVICES CO /MA/ added | 641,020 | $314M | 0.5% | 2026-Q2 |
| DEUTSCHE BANK AG\ added | 575,041 | $282M | 0.5% | 2026-Q2 |
| Jericho Capital Asset Management L.P. trimmed | 561,513 | $275M | 0.5% | 2026-Q2 |
| WELLS FARGO & COMPANY/MN added | 422,655 | $207M | 0.4% | 2026-Q2 |
| Pictet Asset Management Holding SA added | 414,698 | $203M | 0.4% | 2026-Q2 |
| Swiss National Bank trimmed | 398,812 | $196M | 0.3% | 2026-Q2 |
| FIRST TRUST ADVISORS LP trimmed | 396,531 | $195M | 0.3% | 2026-Q2 |
| AMERIPRISE FINANCIAL INC added | 391,326 | $192M | 0.3% | 2026-Q2 |
| WEALTH ENHANCEMENT ADVISORY SERVICES, LLC added | 379,977 | $170M | 0.3% | 2026-Q2 |
| BALYASNY ASSET MANAGEMENT L.P. added | 372,449 | $183M | 0.3% | 2026-Q2 |
| UBS Group AG trimmed | 362,297 | $178M | 0.3% | 2026-Q2 |
| Sumitomo Mitsui Trust Group, Inc. added | 357,440 | $175M | 0.3% | 2026-Q2 |
| Mitsubishi UFJ Asset Management Co., Ltd. added | 342,995 | $168M | 0.3% | 2026-Q2 |
| Man Group plc added | 334,805 | $164M | 0.3% | 2026-Q2 |
| ROYAL BANK OF CANADA added | 332,601 | $163M | 0.3% | 2026-Q2 |
| BNP PARIBAS FINANCIAL MARKETS trimmed | 329,488 | $162M | 0.3% | 2026-Q2 |
| Robeco Institutional Asset Management B.V. added | 319,285 | $157M | 0.3% | 2026-Q2 |
| ROYAL LONDON ASSET MANAGEMENT LTD added | 318,654 | $156M | 0.3% | 2026-Q2 |
| RAYMOND JAMES FINANCIAL INC added | 313,171 | $154M | 0.3% | 2026-Q2 |
| SCHRODER INVESTMENT MANAGEMENT GROUP trimmed | 310,874 | $149M | 0.3% | 2026-Q2 |
| PRIMECAP MANAGEMENT CO/CA/ trimmed | 308,050 | $151M | 0.3% | 2026-Q2 |
| Vanguard Global Advisers, LLC trimmed | 307,128 | $151M | 0.3% | 2026-Q2 |
| CITIGROUP INC added | 296,534 | $145M | 0.3% | 2026-Q2 |
| NEUBERGER BERMAN GROUP LLC added | 292,278 | $143M | 0.2% | 2026-Q2 |
| Qube Research & Technologies Ltd added | 282,869 | $139M | 0.2% | 2026-Q2 |
| BARCLAYS PLC added | 278,076 | $136M | 0.2% | 2026-Q2 |
| VANGUARD ASSET MANAGEMENT, Ltd added | 275,711 | $135M | 0.2% | 2026-Q2 |
| Allianz Asset Management GmbH trimmed | 274,184 | $107M | 0.2% | 2026-Q2 |
| National Pension Service trimmed | 272,251 | $134M | 0.2% | 2026-Q2 |
| HSBC HOLDINGS PLC added | 268,098 | $131M | 0.2% | 2026-Q2 |
| FRANKLIN RESOURCES INC added | 260,420 | $128M | 0.2% | 2026-Q2 |
| RHUMBLINE ADVISERS added | 258,789 | $127M | 0.2% | 2026-Q2 |
| California Public Employees Retirement System added | 240,709 | $118M | 0.2% | 2026-Q2 |
| Analog Century Management LP trimmed | 226,198 | $111M | 0.2% | 2026-Q2 |
| Alyeska Investment Group, L.P. trimmed | 220,966 | $108M | 0.2% | 2026-Q2 |
| CITADEL ADVISORS LLC added | 214,064 | $105M | 0.2% | 2026-Q2 |
| Assenagon Asset Management S.A. trimmed | 214,002 | $105M | 0.2% | 2026-Q2 |
| CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM added | 213,528 | $105M | 0.2% | 2026-Q2 |
| Point72 Asset Management, L.P. trimmed | 210,516 | $103M | 0.2% | 2026-Q2 |
| Caisse de depot et placement du Quebec added | 200,342 | $98M | 0.2% | 2026-Q2 |
| Amanah Holdings Trust | 200,000 | $98M | 0.2% | 2026-Q2 |
| Williams Jones Wealth Management, LLC. trimmed | 195,762 | $96M | 0.2% | 2026-Q2 |
| RENAISSANCE TECHNOLOGIES LLC added | 184,774 | $91M | 0.2% | 2026-Q2 |
| Russell Investments Group, Ltd. trimmed | 175,002 | $85M | 0.1% | 2026-Q2 |
| TD Asset Management Inc added | 174,717 | $86M | 0.1% | 2026-Q2 |
| BIT Capital GmbH new | 168,866 | $83M | 0.1% | 2026-Q2 |
| Squarepoint Ops LLC added | 167,285 | $82M | 0.1% | 2026-Q2 |
| MILLENNIUM MANAGEMENT LLC added | 166,420 | $82M | 0.1% | 2026-Q2 |
| PRINCIPAL FINANCIAL GROUP INC added | 165,322 | $81M | 0.1% | 2026-Q2 |
| LPL Financial LLC added | 164,458 | $81M | 0.1% | 2026-Q2 |
| Zurcher Kantonalbank (Zurich Cantonalbank) trimmed | 158,882 | $78M | 0.1% | 2026-Q2 |
| PRUDENTIAL FINANCIAL INC trimmed | 158,354 | $78M | 0.1% | 2026-Q2 |
| ENVESTNET ASSET MANAGEMENT INC trimmed | 153,397 | $75M | 0.1% | 2026-Q2 |
| NEW YORK STATE COMMON RETIREMENT FUND added | 152,786 | $75M | 0.1% | 2026-Q2 |
| SEI INVESTMENTS CO trimmed | 144,010 | $71M | 0.1% | 2026-Q2 |
| JUPITER ASSET MANAGEMENT LTD added | 141,910 | $70M | 0.1% | 2026-Q2 |
| BARROW HANLEY MEWHINNEY & STRAUSS LLC trimmed | 137,836 | $68M | 0.1% | 2026-Q2 |
| WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC trimmed | 133,801 | $66M | 0.1% | 2026-Q2 |
| D. E. Shaw & Co., Inc. added | 133,195 | $65M | 0.1% | 2026-Q2 |
| Senvest Management, LLC trimmed | 130,426 | $64M | 0.1% | 2026-Q2 |
| ThornTree Capital Partners LP | 130,272 | $64M | 0.1% | 2026-Q2 |
| DigitalBridge Group, Inc. trimmed | 129,954 | $64M | 0.1% | 2026-Q2 |
| CANADA PENSION PLAN INVESTMENT BOARD added | 128,320 | $63M | 0.1% | 2026-Q2 |
| Tidal Investments LLC trimmed | 127,546 | $63M | 0.1% | 2026-Q2 |
| Rokos Capital Management LLP added | 127,045 | $62M | 0.1% | 2026-Q2 |
| BECKER CAPITAL MANAGEMENT INC trimmed | 127,011 | $62M | 0.1% | 2026-Q2 |
| Foundations Investment Advisors, LLC trimmed | 126,114 | $62M | 0.1% | 2026-Q2 |
| ADAGE CAPITAL PARTNERS GP, L.L.C. added | 126,000 | $62M | 0.1% | 2026-Q2 |
| STATE BOARD OF ADMINISTRATION OF FLORIDA RETIREMENT SYSTEM trimmed | 124,548 | $61M | 0.1% | 2026-Q2 |
| AVIVA PLC added | 124,014 | $61M | 0.1% | 2026-Q2 |
| Korea Investment CORP trimmed | 121,898 | $60M | 0.1% | 2026-Q2 |
Ownership over time
Tracked institutional holder count and total shares held by filing quarter (independent scales). The curated-era tail and any mid-ingest latest quarter are handled honestly — a partial quarter is not drawn as a collapse.
Reading this table
Funds hold the same stock for different reasons — an index fund “holds” almost everything, an active manager sizes a name to a mandate and a benchmark, and each fund entered at its own price and time. Because 13F is filed up to 45 days after quarter-end, every row is a backward-looking snapshot; a manager may have traded since. Share-class siblings (a company’s A and C shares) are rolled up to one line so a dual-class name is never double-counted. Compare like-for-like. A large holder is not an endorsement, and a fund exiting is not a warning — this is a starting question, not a verdict.
About 13F filings
A Form 13F is a quarterly disclosure that institutional investment managers with over $100 million in US-listed equities must file with the SEC. In plain English: it is a snapshot of the long stock positions a fund held at the end of a quarter. It covers long US-listed equities only — not short positions, options, cash, or private holdings — and the funds shown are the large sample we track, not the complete 13F universe.