Free · no sign-up · Q2 2026

Which funds own CIEN

Ciena Corp in the Q2 2026 filings. At least 18 of the 91 current managers on file reported a position, worth $14.9bn between them. It is among the largest positions of fewer than a fifth of the current managers on file. Buying and selling roughly cancelled this quarter, which is what a name looks like when the argument is still live.

Managers holding: 18; at least, of 91 current
Combined value: $14.9bn; as reported
Opened: 3; new this quarter
Added to: 9; already held
Trimmed or sold out: 10; 4 sold out entirely

Only each manager’s largest 200 positions are listed here, so a smaller holder may be missing.

Managers reporting a position

Largest first. Weight is the share of that manager’s whole reported book, which is the number worth quoting: $400m is a rounding error in one book and a defining bet in another.

Manager	Value	Weight	Shares	Change on the quarter	Action
Fidelity (FMR LLC) Long-only · $2304bn book	$9.4bn	0.4%	19,113,538	+$1.1bn-2,096,218	Trimmed
T. Rowe Price Associates Inc Long-only · $999bn book	$2.0bn	0.2%	4,071,401	-$38m-1,171,401	Trimmed
Capital World Investors Long-only · $846bn book	$861m	0.1%	1,755,602	+$192m+30,795	Added
Arrowstreet Capital LP Quantitative · $225bn book	$823m	0.4%	1,677,029	+$284m+288,552	Added
AQR Capital Management LLC Quantitative · $287bn book	$507m	0.2%	1,052,165	+$133m+75,071	Added
Capital Research Global Investors Long-only · $717bn book	$322m	0.0%	656,554	-$746m-2,093,496	Trimmed
Balyasny Asset Management LLC Multi-strategy · $80.2bn book	$183m	0.2%	372,449	+$57m+49,030	Added
Acadian Asset Management LLC Quantitative · $84.2bn book	$174m	0.2%	354,846	+$46m+24,725	Added
Man Group PLC Quantitative · $62.7bn book	$164m	0.3%	334,805	+$155m+311,418	Added
Point72 Asset Management LP Multi-strategy · $90.7bn book	$103m	0.1%	210,516	-$108m-334,139	Trimmed
Renaissance Technologies LLC Quantitative · $72.6bn book	$91m	0.1%	184,774	+$53m+86,974	Added
Rokos Capital Management LLP Macro · $26.8bn book	$62m	0.2%	127,045	+$37m+60,585	Added
Caxton Associates LLP Macro · $5.3bn book	$58m	1.1%	117,924	opened117,924	New
Bridgewater Associates LP Macro · $24.4bn book	$50m	0.2%	101,038	-$6.3m-42,808	Trimmed
Walleye Capital LLC Multi-strategy · $28.0bn book	$44m	0.2%	89,241	+$21m+31,406	Added
Freestone Grove Partners LP Multi-strategy · $15.6bn book	$37m	0.2%	76,121	-$14m-57,146	Trimmed
Winton Group Ltd Quantitative · $3.1bn book	$15m	0.5%	30,240	opened30,240	New
Discovery Capital Management LLC Macro · $2.4bn book	$2.0m	0.1%	4,009	opened4,009	New

Sold out of this quarter

Valued at what the position was worth in the previous filing, because by this one it is gone.

Lone Pine Capital LLC · Long/short equity$314m held before
Whale Rock Capital Management LLC · Long/short equity$90m held before
Steadfast Capital Management LP · Long/short equity$32m held before
Holocene Advisors LP · Long/short equity$9.9m held before

Ownership through time

At least 27 of the 95 managers whose filings are on file listed CIEN in Q2 2026, against 7 in Q2 2013. 2 managers fewer than in Q1 2026: 4 started positions; 2 listed it again; 3 sold out, by their own filings; 5 no longer listed it among the positions read, which can mean a holding below the listed range, a filing that reported no holdings, or a filing not yet made.

Each manager’s largest 500 positions a quarter are read, so a small holding in a very large book can be missing, and a manager is counted as leaving only where its own filing shows it.

Managers on file listing it

Their combined reported value

Between the quarter ends of Q1 2026 and Q2 2026. Each change in shares is valued at the Q2 2026 price, so the price’s own move is left out; a 13F shows the two quarter ends, not when in between anything was bought or sold.

Started in Q2 2026

Largest increases, by shares

Arrowstreet Capital LP1,388,477 to 1,677,029 shares+$142m
Invesco Ltd1,530,293 to 1,730,210 shares+$98m
Caxton Associates LLPnew: 117,924 shares+$58m
Renaissance Technologies LLC97,800 to 184,774 shares+$43m
AQR Capital Management LLC977,094 to 1,052,165 shares+$36m

Largest decreases, by shares

Fidelity (FMR LLC)21,209,756 to 19,113,538 shares-$1.0bn
Capital Research Global Investors2,750,050 to 656,554 shares-$1.0bn
T. Rowe Price Associates Inc5,242,802 to 4,071,401 shares-$575m
Point72 Asset Management LP544,655 to 210,516 shares-$164m
Freestone Grove Partners LP133,267 to 76,121 shares-$28m

Left it

Lone Pine Capital LLCwas $314m
Whale Rock Capital Management LLCwas $90m
Steadfast Capital Management LPwas $32m

Manager	First listed	Largest	Q2 2026
Fidelity (FMR LLC)	Q2 2020	$9.4bn	$9.4bn
T. Rowe Price Associates Inc	Q4 2024	$2.0bn	$2.0bn
Capital World Investors	Q1 2022	$861m	$861m
Invesco Ltd	Q2 2014	$849m	$849m
Arrowstreet Capital LP	Q4 2018	$823m	$823m
AQR Capital Management LLC	Q3 2018	$507m	$507m
Capital Research Global Investors	Q1 2026	$1.1bn	$322m
MFS Investment Management	Q4 2025	$314m	$314m
Balyasny Asset Management LLC	Q2 2015	$183m	$183m
Acadian Asset Management LLC	Q3 2019	$174m	$174m
Man Group PLC	Q4 2018	$164m	$164m
Neuberger Berman Group LLC	Q4 2015	$272m	$143m
Point72 Asset Management LP	Q4 2017	$224m	$103m
Renaissance Technologies LLC	Q2 2013	$98m	$91m
Squarepoint Ops LLC	Q4 2016	$82m	$82m
AllianceBernstein LP	Q2 2013	$390m	last listed Q1 2026
Lone Pine Capital LLC	Q3 2025	$314m	last listed Q1 2026
Whale Rock Capital Management LLC	Q2 2025	$209m	last listed Q1 2026
Wellington Management Group LLP	Q1 2015	$176m	last listed Q2 2021
D. E. Shaw & Co.	Q1 2018	$113m	last listed Q2 2020
Holocene Advisors LP	Q4 2017	$113m	last listed Q1 2026
Janus Henderson Group Ltd	Q3 2013	$106m	last listed Q1 2026
Maverick Capital Ltd	Q4 2017	$105m	last listed Q2 2025
Millennium Management LLC	Q3 2013	$99m	last listed Q4 2025
Citadel Advisors LLC	Q4 2015	$93m	last listed Q3 2019

What CIEN is worth

Knowing who owns it is half the question. The other half is what it is worth against the companies it trades beside, which is the one an interviewer will follow up with.

Build the comp set around CIEN →

How much of the picture this is

A Form 13F reports US-listed long equity and nothing else: no shorts, no bonds, no cash and no non-US listings. It arrives forty-five days after the quarter ends, so a manager who sold in July still shows the position in a filing published in August. This page reads the managers on file here rather than every filer in the market, and each manager’s largest positions rather than the whole table, so a small position in a very large book may not appear. Say “their last filing showed” rather than “they own”, and the distinction will do you credit.

What to do with a name the funds are buying

Knowing who owns something is the start of a pitch, not the pitch. The next questions are what it is worth and why they were buying.

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