Who owns CIEN (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-Q1 13F filings. 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
The tracked-fund tape on CIEN is one-sided between 2025-Q4 and 2026-Q1: 552 added or opened and 160 trimmed or exited — on balance accumulating.
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 2025-Q4 and 2026-Q1, across 1075 tracked filers holding CIEN, 626 increased or opened the position and 462 reduced or closed it; over the same quarter, open-market insider Form 4 buying and selling roughly offset.
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 2025-Q4 and 2026-Q1 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 129
- VANGUARD CAPITAL MANAGEMENT LLC$3.6B
- VANGUARD PORTFOLIO MANAGEMENT LLC$2.9B
- Capital Research Global Investors$1.1B
- LONE PINE CAPITAL LLC$314M
- VANGUARD FIDUCIARY TRUST CO$308M
- Vanguard Global Advisers, LLC$121M
Full exits 59
- VANGUARD GROUP INC$3.3B
- Hood River Capital Management LLC$106M
- WT Asset Management Ltd$31M
- Qube Research & Technologies Ltd$31M
- FORT WASHINGTON INVESTMENT ADVISORS INC /OH/$29M
- Schonfeld Strategic Advisors LLC$26M
Largest adds
- FMR LLC$3.3B
- STATE STREET CORP$1.3B
- JPMORGAN CHASE & CO$1.2B
- PRICE T ROWE ASSOCIATES INC /MD/$1.1B
- GEODE CAPITAL MANAGEMENT, LLC$949M
- BlackRock, Inc.$586M
Largest trims
- NORGES BANK$186M
- FengHe Fund Management Pte. Ltd.$120M
- Whale Rock Capital Management LLC$119M
- CITADEL ADVISORS LLC$114M
- WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC$102M
- Holocene Advisors, LP$91M
Institutional holders
One row per tracked fund, largest reported value first. “% of value” is the fund’s share of this security’s tracked institutional value — not of shares outstanding. Rows marked stale are from an earlier filing than the security’s latest quarter — that fund is absent from the newest snapshot (position exited, or reported under a different name).
| Fund | Shares | Reported value | % of value | Quarter |
|---|---|---|---|---|
| FMR LLC added | 21,203,177 | $8.2B | 16.5% | 2026-Q1 |
| BlackRock, Inc. trimmed | 11,552,013 | $4.5B | 9.0% | 2026-Q1 |
| JPMORGAN CHASE & CO trimmed | 10,226,649 | $3.7B | 7.5% | 2026-Q1 |
| VANGUARD CAPITAL MANAGEMENT LLC new | 9,169,355 | $3.6B | 7.1% | 2026-Q1 |
| VANGUARD PORTFOLIO MANAGEMENT LLC new | 7,369,124 | $2.9B | 5.7% | 2026-Q1 |
| STATE STREET CORP added | 6,309,050 | $2.4B | 4.9% | 2026-Q1 |
| PRICE T ROWE ASSOCIATES INC /MD/ added | 5,242,802 | $2.0B | 4.1% | 2026-Q1 |
| GEODE CAPITAL MANAGEMENT, LLC added | 4,065,559 | $1.6B | 3.2% | 2026-Q1 |
| Capital Research Global Investors new | 2,750,050 | $1.1B | 2.1% | 2026-Q1 |
| BANK OF AMERICA CORP /DE/ trimmed | 1,954,632 | $759M | 1.5% | 2026-Q1 |
| Capital World Investors trimmed | 1,724,807 | $670M | 1.3% | 2026-Q1 |
| Jericho Capital Asset Management L.P. | 1,656,172 | $643M | 1.3% | 2026-Q1 |
| MORGAN STANLEY added | 1,561,554 | $606M | 1.2% | 2026-Q1 |
| Invesco Ltd. trimmed | 1,517,126 | $589M | 1.2% | 2026-Q1 |
| ARROWSTREET CAPITAL, LIMITED PARTNERSHIP trimmed | 1,388,477 | $539M | 1.1% | 2026-Q1 |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC added | 1,272,258 | $494M | 1.0% | 2026-Q1 |
| VOYA INVESTMENT MANAGEMENT LLC added | 1,205,099 | $468M | 0.9% | 2026-Q1 |
| NORTHERN TRUST CORP trimmed | 1,187,291 | $461M | 0.9% | 2026-Q1 |
| DIMENSIONAL FUND ADVISORS LP trimmed | 1,146,020 | $445M | 0.9% | 2026-Q1 |
| BNP PARIBAS ASSET MANAGEMENT Holding S.A. trimmed | 1,021,586 | $397M | 0.8% | 2026-Q1 |
| AQR CAPITAL MANAGEMENT LLC trimmed | 976,613 | $374M | 0.7% | 2026-Q1 |
| Bank of New York Mellon Corp trimmed | 926,858 | $360M | 0.7% | 2026-Q1 |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC added | 851,932 | $331M | 0.7% | 2026-Q1 |
| Nuveen, LLC trimmed | 844,193 | $328M | 0.7% | 2026-Q1 |
| LONE PINE CAPITAL LLC trimmed | 809,522 | $314M | 0.6% | 2026-Q1 |
| Polar Capital Holdings Plc trimmed | 798,395 | $310M | 0.6% | 2026-Q1 |
| VANGUARD FIDUCIARY TRUST CO new | 793,398 | $308M | 0.6% | 2026-Q1 |
| GOLDMAN SACHS GROUP INC added | 773,258 | $300M | 0.6% | 2026-Q1 |
| Atreides Management, LP trimmed | 676,807 | $263M | 0.5% | 2026-Q1 |
| Legal & General Group Plc added | 648,383 | $252M | 0.5% | 2026-Q1 |
| UBS Group AG added | 648,209 | $252M | 0.5% | 2026-Q1 |
| MASSACHUSETTS FINANCIAL SERVICES CO /MA/ trimmed | 582,668 | $226M | 0.5% | 2026-Q1 |
| Point72 Asset Management, L.P. added | 544,655 | $211M | 0.4% | 2026-Q1 |
| AMERICAN CENTURY COMPANIES INC added | 535,842 | $208M | 0.4% | 2026-Q1 |
| DEUTSCHE BANK AG\ trimmed | 527,888 | $205M | 0.4% | 2026-Q1 |
| PRIMECAP MANAGEMENT CO/CA/ trimmed | 438,050 | $170M | 0.3% | 2026-Q1 |
| FIRST TRUST ADVISORS LP trimmed | 436,945 | $170M | 0.3% | 2026-Q1 |
| Amundi trimmed | 431,232 | $167M | 0.3% | 2026-Q1 |
| BNP PARIBAS FINANCIAL MARKETS added | 423,783 | $165M | 0.3% | 2026-Q1 |
| T. Rowe Price Investment Management, Inc. added | 418,459 | $162M | 0.3% | 2026-Q1 |
| Swiss National Bank added | 413,332 | $160M | 0.3% | 2026-Q1 |
| WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC trimmed | 398,579 | $155M | 0.3% | 2026-Q1 |
| SCHRODER INVESTMENT MANAGEMENT GROUP trimmed | 394,092 | $144M | 0.3% | 2026-Q1 |
| Assenagon Asset Management S.A. trimmed | 364,547 | $142M | 0.3% | 2026-Q1 |
| WELLS FARGO & COMPANY/MN added | 352,445 | $137M | 0.3% | 2026-Q1 |
| ACADIAN ASSET MANAGEMENT LLC added | 330,121 | $128M | 0.3% | 2026-Q1 |
| PRUDENTIAL FINANCIAL INC trimmed | 325,763 | $126M | 0.3% | 2026-Q1 |
| WEALTH ENHANCEMENT ADVISORY SERVICES, LLC trimmed | 290,123 | $126M | 0.3% | 2026-Q1 |
| BALYASNY ASSET MANAGEMENT L.P. trimmed | 323,419 | $126M | 0.3% | 2026-Q1 |
| Sumitomo Mitsui Trust Group, Inc. added | 321,825 | $125M | 0.3% | 2026-Q1 |
| ALLIANCEBERNSTEIN L.P. added | 527,411 | $123M | 0.2% | 2026-Q1 |
| Mitsubishi UFJ Asset Management Co., Ltd. added | 317,137 | $123M | 0.2% | 2026-Q1 |
| Anatole Investment Management Ltd trimmed | 313,445 | $122M | 0.2% | 2026-Q1 |
| Vanguard Global Advisers, LLC new | 310,389 | $121M | 0.2% | 2026-Q1 |
| RAYMOND JAMES FINANCIAL INC trimmed | 304,779 | $118M | 0.2% | 2026-Q1 |
| BARROW HANLEY MEWHINNEY & STRAUSS LLC trimmed | 301,554 | $117M | 0.2% | 2026-Q1 |
| National Pension Service added | 298,543 | $116M | 0.2% | 2026-Q1 |
| Allianz Asset Management GmbH added | 289,386 | $112M | 0.2% | 2026-Q1 |
| NEUBERGER BERMAN GROUP LLC trimmed | 289,692 | $112M | 0.2% | 2026-Q1 |
| 1832 Asset Management L.P. trimmed | 287,400 | $112M | 0.2% | 2026-Q1 |
| Robeco Institutional Asset Management B.V. added | 267,943 | $104M | 0.2% | 2026-Q1 |
| BARCLAYS PLC added | 265,543 | $103M | 0.2% | 2026-Q1 |
| ROYAL BANK OF CANADA trimmed | 263,542 | $102M | 0.2% | 2026-Q1 |
| Foundations Investment Advisors, LLC trimmed | 256,498 | $100M | 0.2% | 2026-Q1 |
| JANUS HENDERSON GROUP PLC trimmed | 249,204 | $97M | 0.2% | 2026-Q1 |
| Analog Century Management LP trimmed | 247,412 | $96M | 0.2% | 2026-Q1 |
| RHUMBLINE ADVISERS trimmed | 246,308 | $96M | 0.2% | 2026-Q1 |
| VANGUARD ASSET MANAGEMENT, Ltd new | 244,340 | $95M | 0.2% | 2026-Q1 |
| California Public Employees Retirement System trimmed | 237,900 | $92M | 0.2% | 2026-Q1 |
| Whale Rock Capital Management LLC trimmed | 231,267 | $90M | 0.2% | 2026-Q1 |
| HSBC HOLDINGS PLC added | 223,203 | $87M | 0.2% | 2026-Q1 |
| Munro Partners trimmed | 214,975 | $83M | 0.2% | 2026-Q1 |
| Williams Jones Wealth Management, LLC. trimmed | 214,693 | $83M | 0.2% | 2026-Q1 |
| CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM trimmed | 209,689 | $81M | 0.2% | 2026-Q1 |
| CITIGROUP INC trimmed | 200,056 | $78M | 0.2% | 2026-Q1 |
| Amanah Holdings Trust | 200,000 | $78M | 0.2% | 2026-Q1 |
| ENVESTNET ASSET MANAGEMENT INC trimmed | 191,201 | $74M | 0.1% | 2026-Q1 |
| SG Americas Securities, LLC added | 190,949 | $74M | 0.1% | 2026-Q1 |
| AMERIPRISE FINANCIAL INC trimmed | 186,915 | $72M | 0.1% | 2026-Q1 |
| Russell Investments Group, Ltd. added | 178,491 | $69M | 0.1% | 2026-Q1 |
| Senvest Management, LLC trimmed | 172,926 | $67M | 0.1% | 2026-Q1 |
| Zurcher Kantonalbank (Zurich Cantonalbank) added | 172,289 | $67M | 0.1% | 2026-Q1 |
| TD Asset Management Inc trimmed | 169,916 | $66M | 0.1% | 2026-Q1 |
| Stephens Investment Management Group LLC trimmed | 166,171 | $65M | 0.1% | 2026-Q1 |
| Zurich Insurance Group Ltd/FI trimmed | 165,181 | $64M | 0.1% | 2026-Q1 |
| North Growth Management Ltd. trimmed | 157,000 | $61M | 0.1% | 2026-Q1 |
| PRINCIPAL FINANCIAL GROUP INC trimmed | 156,922 | $61M | 0.1% | 2026-Q1 |
| LPL Financial LLC added | 155,993 | $61M | 0.1% | 2026-Q1 |
| SEI INVESTMENTS CO trimmed | 144,773 | $56M | 0.1% | 2026-Q1 |
| WELLINGTON MANAGEMENT GROUP LLP added | 143,980 | $56M | 0.1% | 2026-Q1 |
| Bridgewater Associates, LP trimmed | 143,846 | $56M | 0.1% | 2026-Q1 |
| Tidal Investments LLC added | 142,146 | $55M | 0.1% | 2026-Q1 |
| BECKER CAPITAL MANAGEMENT INC trimmed | 141,669 | $55M | 0.1% | 2026-Q1 |
| CITADEL ADVISORS LLC trimmed | 140,435 | $55M | 0.1% | 2026-Q1 |
| ROYAL LONDON ASSET MANAGEMENT LTD added | 134,829 | $52M | 0.1% | 2026-Q1 |
| Ensign Peak Advisors, Inc added | 134,483 | $52M | 0.1% | 2026-Q1 |
| Freestone Grove Partners LP trimmed | 133,267 | $52M | 0.1% | 2026-Q1 |
| VANGUARD GROUP INC trimmed | 14,184,610 | $3.3B | 6.6% | 2025-Q4 stale |
| Hood River Capital Management LLC trimmed | 453,779 | $106M | 0.2% | 2025-Q4 stale |
| Artisan Partners Limited Partnership new | 434,292 | $63M | 0.1% | 2025-Q3 stale |
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.