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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
30 Jun 2026
the date the book describes
Filed
27 Oct 2026
latest of these filings; the earliest 3 Aug 2026
Managers listing it
40
at least, of 95 tracked, among listed positions
Comparable managers
91
filed both Q1 2026 and Q2 2026; 25 listed it in both
Shares listed
34,156,920
combined, among listed positions
Reported value
$16.7bn
combined, at the quarter end

AllianceBernstein LP. Values in this filing are at the previous quarter end's prices; its share count is the quarter end's.

Among the 91 comparable managers: 26 buyers (opened or added shares) and 19 sellers (trimmed or exited), at least, among listed positions. Their net change in shares was -5,913,426.

Managers listing CIEN in Q2 2026

Share of 13F value is the position’s reported value over everything the manager reported that quarter. The share change is against Q1 2026, and only where both filings list the position. A rise in value with no rise in shares is the price, not buying.

40 of 40 holders

ActionFiling
Fidelity (FMR LLC)19,113,538$9.4bn0.41%Trimmed-2,096,21813 Aug 2026 (the filing on sec.gov)
T. Rowe Price Associates Inc4,071,401$2.0bn0.20%Trimmed-1,171,40114 Aug 2026 (the filing on sec.gov)
Capital World Investors1,755,602$861m0.10%Added+30,79512 Aug 2026 (the filing on sec.gov)
Invesco Ltd1,730,210$849m0.07%Added+199,91714 Aug 2026 (the filing on sec.gov)
Arrowstreet Capital LP1,677,029$823m0.37%Added+288,55213 Aug 2026 (the filing on sec.gov)
AQR Capital Management LLC1,052,165$507m0.18%Added+75,07114 Aug 2026 (the filing on sec.gov)
Capital Research Global Investors656,554$322munder 0.1%Trimmed-2,093,49612 Aug 2026 (the filing on sec.gov)
MFS Investment Management641,020$314m0.10%Added+58,3523 Aug 2026 (the filing on sec.gov)
Balyasny Asset Management LLC372,449$183m0.23%Added+49,03014 Aug 2026 (the filing on sec.gov)
Acadian Asset Management LLC354,846$174m0.21%Added+24,72513 Aug 2026 (the filing on sec.gov)
Man Group PLC334,805$164m0.26%Added+311,41814 Aug 2026 (the filing on sec.gov)
Neuberger Berman Group LLC292,278$143m0.10%Added+2,58627 Oct 2026 (the filing on sec.gov)
Citadel Advisors LLC214,064$105munder 0.1%Added+73,6292 Sep 2026 (the filing on sec.gov)
Point72 Asset Management LP210,516$103m0.11%Trimmed-334,13914 Aug 2026 (the filing on sec.gov)
Renaissance Technologies LLC184,774$91m0.12%Added+86,97413 Aug 2026 (the filing on sec.gov)
Squarepoint Ops LLC167,285$82m0.09%Added+163,54114 Aug 2026 (the filing on sec.gov)
Millennium Management LLC166,420$82munder 0.1%Added+75,70414 Aug 2026 (the filing on sec.gov)
D. E. Shaw & Co.133,195$65munder 0.1%Added+124,28314 Aug 2026 (the filing on sec.gov)
Rokos Capital Management LLP127,045$62m0.23%Added+60,58514 Aug 2026 (the filing on sec.gov)
Caxton Associates LLP117,924$58m1.08%Newnew14 Aug 2026 (the filing on sec.gov)
AllianceBernstein LP146,118$57munder 0.1%Trimmed-381,29314 Aug 2026 (the filing on sec.gov)
Jane Street Group LLC104,302$51munder 0.1%Added+39,52114 Aug 2026 (the filing on sec.gov)
Bridgewater Associates LP101,038$50m0.20%Trimmed-42,80814 Aug 2026 (the filing on sec.gov)
Walleye Capital LLC89,241$44m0.16%Added+31,4063 Aug 2026 (the filing on sec.gov)
Freestone Grove Partners LP76,121$37m0.24%Trimmed-57,14614 Aug 2026 (the filing on sec.gov)
Page 1 of 2

Largest increases and reductions, by shares

Q1 2026 to Q2 2026, 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 →