CIENA CORP (CIEN) Institutional Ownership Changes & 13F Activity

CIENA CORP (CIEN). Institutional ownership data tracks hedge funds, asset managers, and other institutional investors based on recent SEC Form 13F filings. This page analyzes institutional buying and selling activity, new holdings, and sold-out positions among tracked filers. Notable filers include Lone Pine Capital, Renaissance Technologies LLC, First Eagle U.S. Value, Mairs & Power Growth Fund, and Sequoia Financial Advisors.

Portfolio quarterNameTypeQuantityRemainingReported stock balance
Q1 2026Lone Pine CapitalSell-1,197,140809,522$314,280,726
Q1 2026Renaissance Technologies LLCBuy65,20097,800$37,968,894
Q1 2026First Eagle U.S. ValueSell-38,3002,600$1,009,398
Q1 2026Mairs & Power Growth FundSell-2002,800$1,087,044
Q1 2026Sequoia Financial AdvisorsBuy1137,717$2,995,971
Q4 2025Renaissance Technologies LLCSell-276,57432,600$7,624,162
Q4 2025First Eagle U.S. ValueSell-26,50040,900$9,565,283
Q4 2025Sequoia Financial AdvisorsBuy3,6487,604$1,778,348
Q3 2025Lone Pine CapitalBuy2,006,6622,006,662$292,310,454
Q3 2025First Eagle U.S. ValueSell-50,94967,400$9,818,158
Q3 2025Mairs & Power Growth FundSell-1,0003,000$437,010
Q3 2025Sequoia Financial AdvisorsBuy5133,956$576,271
Q2 2025First Eagle U.S. ValueBuy105,834118,349$9,625,324
Q2 2025Mairs & Power Growth FundBuy4,0004,000$325,320
Q2 2025Sequoia Financial AdvisorsBuy3,4433,443$280,020
Q1 2025Renaissance Technologies LLCBuy174,500309,174$18,683,385
Q1 2024Giverny CapitalSell-625,275661$32,686
Q4 2023Renaissance Technologies LLCBuy96,700134,674$6,062
Q4 2023Giverny CapitalSell-9,527625,936$28,173,379
Q3 2023Giverny CapitalSell-68,069635,463$30,031,981
Q2 2023Giverny CapitalBuy36,856703,532$29,893,075
Q2 2023First Eagle U.S. ValueBuy1,00012,515$531,763
Q1 2023Giverny CapitalSell-13,981666,676$35,013,824
Q1 2023First Eagle U.S. ValueBuy10,74511,515$604,768
Q4 2022Giverny CapitalSell-1,629680,657$34,700
Q4 2022First Eagle U.S. ValueBuy30770$39,255
Q3 2022Giverny CapitalBuy7,769682,286$27,585
Q3 2022First Eagle U.S. ValueBuy419740$30
Q2 2022Giverny CapitalBuy28,546674,517$30,825
Q2 2022First Eagle U.S. ValueBuy49321$15

Frequently asked questions about CIEN activity

  • Which institutional owners are buying CIEN?

    Institutional owners buying CIEN include investors who have either initiated new positions or increased their existing holdings based on recent SEC 13F filings. The activity table above highlights which funds added shares in the latest reporting periods and how their positions changed over time.

  • What does "buy" mean in CIEN activity?

    "Buy" means an investor increased their reported position in CIEN compared to the prior reporting period. This reflects growing exposure to CIENA CORP (CIEN) rather than necessarily a brand-new position (though new positions also appear as buys when prior quantity was zero).

  • Is institutional interest in CIEN increasing?

    Institutional interest in CIEN can be assessed by comparing the number of tracked funds adding or increasing positions versus those trimming or exiting across the periods shown. A higher number of additions typically signals increasing participation among large filers, but it should be read alongside position sizes and the full table.

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