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CIEN in the 13F filings

Ciena Corp · CUSIP 171779309

Sector · Technology hardware and equipmentTheme · AI infrastructure and semiconductors· L3VLUP-defined
Quarter
Q3 2026 · early filersQ2 2026Q1 2026Q4 2025Q3 2025Q2 2025Q1 2025Q4 2024Q3 2024Q2 2024Q1 2024Q4 2023
Quarter end
31 Dec 2025
the date the book describes
Filed
27 Oct 2026
latest of these filings; the earliest 22 Jan 2026
Managers listing it
38
at least, of 95 tracked, among listed positions
Comparable managers
92
filed both Q3 2025 and Q4 2025; 18 listed it in both
Shares listed
38,881,187
combined, among listed positions
Reported value
$9.1bn
combined, at the quarter end

Among the 92 comparable managers: 16 buyers (opened or added shares) and 26 sellers (trimmed or exited), at least, among listed positions. Their net change in shares was -1,707,175.

Managers listing CIEN in Q4 2025

Share of 13F value is the position’s reported value over everything the manager reported that quarter. The share change is against Q3 2025, and only where both filings list the position. A rise in value with no rise in shares is the price, not buying.

38 of 38 holders

ActionFiling
Fidelity (FMR LLC)21,128,210$4.9bn0.25%Trimmed-30,17617 Feb 2026 (the filing on sec.gov)
T. Rowe Price Associates Inc4,051,625$948m0.10%Added+1,404,13217 Feb 2026 (the filing on sec.gov)
Arrowstreet Capital LP2,236,835$523m0.31%Added+1,092,98013 Feb 2026 (the filing on sec.gov)
Capital World Investors1,868,881$437m0.06%Added+31,90011 Feb 2026 (the filing on sec.gov)
Invesco Ltd1,518,841$355munder 0.1%Added+280,09619 Feb 2026 (the filing on sec.gov)
AQR Capital Management LLC1,412,560$330m0.17%Trimmed-89,90817 Feb 2026 (the filing on sec.gov)
Whale Rock Capital Management LLC893,483$209m2.67%Trimmed-444,31717 Feb 2026 (the filing on sec.gov)
Citadel Advisors LLC719,747$168munder 0.1%Trimmed-366,78217 Feb 2026 (the filing on sec.gov)
MFS Investment Management607,391$142munder 0.1%Added+445,76922 Jan 2026 (the filing on sec.gov)
Point72 Asset Management LP470,680$110m0.12%Trimmed-110,34217 Feb 2026 (the filing on sec.gov)
Janus Henderson Group Ltd441,637$103munder 0.1%Trimmed-288,44717 Feb 2026 (the filing on sec.gov)
Balyasny Asset Management LLC440,086$103m0.13%Trimmed-183,58817 Feb 2026 (the filing on sec.gov)
Holocene Advisors LP430,157$101m0.21%Added+176,74217 Feb 2026 (the filing on sec.gov)
Millennium Management LLC422,616$99munder 0.1%Trimmed-81,26717 Feb 2026 (the filing on sec.gov)
Neuberger Berman Group LLC387,168$91m0.07%Trimmed-565,03627 Oct 2026 (the filing on sec.gov)
AllianceBernstein LP357,570$84munder 0.1%Added+103,50317 Feb 2026 (the filing on sec.gov)
Steadfast Capital Management LP308,200$72m1.24%Newnew17 Feb 2026 (the filing on sec.gov)
Acadian Asset Management LLC282,964$66m0.11%Added+49,48410 Feb 2026 (the filing on sec.gov)
Bridgewater Associates LP212,643$50m0.18%Added+50,93613 Feb 2026 (the filing on sec.gov)
Rokos Capital Management LLP210,676$49m0.19%Trimmed-157,70513 Feb 2026 (the filing on sec.gov)
Schonfeld Strategic Advisors LLC109,439$26m0.11%Trimmed-44,78117 Feb 2026 (the filing on sec.gov)
Wellington Management Group LLP107,488$25munder 0.1%Newnew17 Feb 2026 (the filing on sec.gov)
Marshall Wace LLP53,201$12munder 0.1%Trimmed-136,19213 Feb 2026 (the filing on sec.gov)
First Eagle Investment Management LLC40,900$9.6munder 0.1%Trimmed-26,5004 Feb 2026 (the filing on sec.gov)
Renaissance Technologies LLC32,600$7.6munder 0.1%Newnew12 Feb 2026 (the filing on sec.gov)
Page 1 of 2

Largest increases and reductions, by shares

Q3 2025 to Q4 2025, among managers that listed it in both quarters or opened it.

Increases

Reductions

New positions and exits

At least these many: a manager is shown exiting only where its own filing shows the position gone.

New (6)

Exited (5)

Ownership over time

Every quarter on file. A quarter-end value moves with the price as well as with the shares held; buyers and sellers count comparable managers, by shares.
8 in Q3 2024 to 27 in Q2 2026

Tracked managers listing it, at least.

01020302014201620182020202220242026
the quarter shown share split complete books; unmarked quarters rest on listed positionsClick a quarter to open it.
CIEN by quarter
QuarterHoldersReported valueBuyersSellers
Q2 20138$199mn.a.n.a.
Q3 20139$264mn.a.n.a.
Q4 20134$110mn.a.n.a.
Q1 20141$28mn.a.n.a.
Q2 20144$113mn.a.n.a.
Q3 20145$116mn.a.n.a.
Q4 20146$140mn.a.n.a.
Q1 20156$320mn.a.n.a.
Q2 20159$383mn.a.n.a.
Q3 201510$429mn.a.n.a.
Q4 20158$513mn.a.n.a.
Q1 20167$308mn.a.n.a.
Q2 20167$230mn.a.n.a.
Q3 20165$239mn.a.n.a.
Q4 20169$500mn.a.n.a.
Q1 20174$272mn.a.n.a.
Q2 20178$385mn.a.n.a.
Q3 20175$521mn.a.n.a.
Q4 201712$602mn.a.n.a.
Q1 20188$340mn.a.n.a.
Q2 20186$330mn.a.n.a.
Q3 201810$456mn.a.n.a.
Q4 20188$413mn.a.n.a.
Q1 201910$548mn.a.n.a.
Q2 201917$676mn.a.n.a.
Q3 201911$716mn.a.n.a.
Q4 201917$920mn.a.n.a.
Q1 202016$887mn.a.n.a.
Q2 202016$1.3bnn.a.n.a.
Q3 202012$575mn.a.n.a.
Q4 202012$774mn.a.n.a.
Q1 20219$596mn.a.n.a.
Q2 20217$615mn.a.n.a.
Q3 20216$388mn.a.n.a.
Q4 20216$1.5bnn.a.n.a.
Q1 202213$1.5bnn.a.n.a.
Q2 202215$1.2bnn.a.n.a.
Q3 202212$1.1bnn.a.n.a.
Q4 202214$1.2bnn.a.n.a.
Q1 202313$1.2bnn.a.n.a.
Q2 202311$498mn.a.n.a.
Q3 202310$856mn.a.n.a.
Q4 202311$903m100
Q1 20247$1.3bn53
Q2 202411$1.3bn84
Q3 20248$1.7bn44
Q4 202412$2.7bn77
Q1 202516$1.8bn124
Q2 202517$2.7bn106
Q3 202521$5.4bn1311
Q4 202524$8.9bn1626
Q1 202629$15.3bn2122
Q2 202627$16.3bn2619

Compare with…

Holders over time, buyers and sellers, and the managers holding both, side by side for up to four stocks.

CIEN and NVDA →CIEN and AVGO →CIEN and MU →Choose a stock to compare with CIEN →

How much of the picture this is

A 13F is a manager’s long US-listed equity book at a quarter end, filed up to 45 days later. It shows no shorts, cash, bonds or performance, and it is never today’s portfolio. Large books are listed to their largest positions, so a manager missing from this table may still hold a small position below that line. These are 95 tracked managers, not the institutional market.

Which funds own CIEN, latest filings →Back to the 13F Explorer →