CIEN Insider Trading Activity

Transactions disclosed by company insiders to the SEC on Form 4, most recent first.

InsiderRoleDateSharesValue
Cumello Joseph EVP & General Mgr. 2026-09-25 1,586 $568,605
NEVENS THOMAS MICHAEL Director 2026-09-24 2,797 $0
Claflin Bruce L. Director 2026-09-24 2,857 $1,016,835
NEVENS THOMAS MICHAEL Director 2026-09-23 3,738 $1,342,092
SMITH GARY B President & CEO 2026-09-20 2,985 $1,041,168
SMITH GARY B President & CEO 2026-09-20 3,102 $1,081,978
SMITH GARY B President & CEO 2026-09-20 1,743 $607,958
SMITH GARY B President & CEO 2026-09-20 937 $326,826
Rothenstein David M EVP & Chief Strategy Officer 2026-09-20 679 $236,835
Rothenstein David M EVP & Chief Strategy Officer 2026-09-20 204 $71,155

How Institutional Funds Moved on CIEN

Position changes disclosed in SEC Form 13F filings. These report a quarterly snapshot, not exact trade dates.

FundChangeQuarter
RENAISSANCE TECHNOLOGIES LLC RENAISSANCE TECHNOLOGIES LLC increased this position by 139% ($37,968,894 -> $90,642,733). 2026-06-30
Silvant Capital Management LLC Silvant Capital Management LLC opened a new position worth $37,358,106. 2026-06-30
NORGES BANK NORGES BANK opened a new position worth $835,499,717. 2026-06-30
BIT Capital GmbH BIT Capital GmbH opened a new position worth $82,838,905. 2026-06-30
Shannon River Fund Management LLC Shannon River Fund Management LLC opened a new position worth $39,881,547. 2026-06-30
Alyeska Investment Group, L.P. Alyeska Investment Group, L.P. opened a new position worth $108,397,081. 2026-06-30
SCGE MANAGEMENT, L.P. SCGE MANAGEMENT, L.P. opened a new position worth $43,659,840. 2026-06-30
Qube Research & Technologies Ltd Qube Research & Technologies Ltd opened a new position worth $138,764,217. 2026-06-30

Which Funds Hold CIEN

Largest reported positions as of 2026-06-30.

FundValueShares
FMR LLC $5,306,220,239 10,816,659
VANGUARD CAPITAL MANAGEMENT LLC $4,529,734,400 9,233,803
VANGUARD PORTFOLIO MANAGEMENT LLC $3,767,827,023 7,680,665
GEODE CAPITAL MANAGEMENT, LLC $1,426,307,161 2,919,453
AMERICAN CENTURY COMPANIES INC $908,413,121 1,851,788
Capital World Investors $861,228,117 1,755,602
NORGES BANK $835,499,717 1,703,155
ARROWSTREET CAPITAL, LIMITED PARTNERSHIP $822,683,346 1,677,029
Sixth Street Partners Management Company, L.P. $612,685,893 1,248,952
CHARLES SCHWAB INVESTMENT MANAGEMENT INC $612,685,893 1,248,952

Data compiled from public SEC filings. This is informational reporting, not investment advice.

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Summary of Renaissance Technologies LLC portfolio increases for the quarter ending 2026-06-30, highlighting positions like Intel, AutoZone, McKesson, and Five Below.

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