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 2022Giverny CapitalBuy312,987645,971$39,165
Q1 2022Renaissance Technologies LLCSell-173,00037,974$2,302
Q1 2022First Eagle U.S. ValueBuy272272$16
Q4 2021Giverny CapitalBuy332,984332,984$25,630
Q4 2021Renaissance Technologies LLCSell-73,000210,974$16,239
Q1 2020Renaissance Technologies LLCSell-898,100283,974$11,305
Q4 2019Renaissance Technologies LLCBuy383,3001,182,074$50,463
Q3 2019Renaissance Technologies LLCBuy408,700798,774$31,336
Q2 2019Renaissance Technologies LLCSell-1,208,200390,074$16,044
Q1 2019Renaissance Technologies LLCBuy1,318,4001,598,274$59,680
Q4 2018Renaissance Technologies LLCSell-952,321279,874$9,491
Q3 2018Renaissance Technologies LLCSell-229,8791,232,195$38,494
Q1 2018Renaissance Technologies LLCSell-454,3001,462,074$37,868
Q4 2017Renaissance Technologies LLCBuy1,227,9001,916,374$40,110
Q3 2017Parnassus Endeavor FundSell-1,000,0001,700,000$37,349
Q2 2017Renaissance Technologies LLCSell-1,850,500688,474$17,226
Q2 2017Parnassus Endeavor FundSell-1,800,0002,700,000$67,554
Q1 2017Renaissance Technologies LLCSell-1,493,3002,538,974$59,945
Q1 2017Parnassus Endeavor FundSell-750,0004,500,000$106,245
Q4 2016Renaissance Technologies LLCBuy2,167,5744,032,274$98,428
Q4 2016Parnassus Endeavor FundSell-450,0005,250,000$128,153
Q3 2016Parnassus Endeavor FundSell-300,0005,700,000$124,260
Q3 2016Renaissance Technologies LLCSell-12,0001,864,700$40,650
Q2 2016Parnassus Endeavor FundBuy400,0006,000,000$112,500
Q2 2016Renaissance Technologies LLCSell-66,4741,876,700$35,188
Q1 2016Parnassus Endeavor FundBuy700,0005,600,000$106,512
Q1 2016Renaissance Technologies LLCSell-55,2001,943,174$36,959
Q4 2015Parnassus Endeavor FundBuy1,800,0004,900,000$101,381
Q4 2015Renaissance Technologies LLCBuy1,771,4901,998,374$41,346
Q3 2015Renaissance Technologies LLCSell-136,421226,884$4,701

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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