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CALX in the 13F filings

Calix Inc · CUSIP 13100M509

Sector · Communications and media
Quarter
Q3 2026 · early filersQ2 2026Q1 2026Q4 2025Q3 2025Q2 2025Q1 2025Q4 2024Q3 2024Q2 2024Q1 2024Q4 2023
Quarter end
31 Mar 2026
the date the book describes
Filed
27 Oct 2026
latest of these filings; the earliest 12 May 2026
Managers listing it
28
at least, of 95 tracked, among listed positions
Comparable managers
91
filed both Q4 2025 and Q1 2026; 7 listed it in both
Shares listed
11,090,935
combined, among listed positions
Reported value
$556m
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: 16 buyers (opened or added shares) and 18 sellers (trimmed or exited), at least, among listed positions. Their net change in shares was +1,295,187.

Managers listing CALX in Q1 2026

Share of 13F value is the position’s reported value over everything the manager reported that quarter. The share change is against Q4 2025, and only where both filings list the position. A rise in value with no rise in shares is the price, not buying.

28 of 28 holders

ActionFiling
AllianceBernstein LP3,251,128$172m0.06%Added+1,788,75715 May 2026 (the filing on sec.gov)
Millennium Management LLC1,903,972$93munder 0.1%Added+462,06015 May 2026 (the filing on sec.gov)
Acadian Asset Management LLC800,330$39m0.06%Trimmed-229,78513 May 2026 (the filing on sec.gov)
Arrowstreet Capital LP551,150$27munder 0.1%Trimmed-726,35514 May 2026 (the filing on sec.gov)
Renaissance Technologies LLC543,418$27munder 0.1%Added+79,80014 May 2026 (the filing on sec.gov)
Wellington Management Group LLP534,517$26munder 0.1%Trimmed-105,21215 May 2026 (the filing on sec.gov)
Artisan Partners LP529,875$26munder 0.1%Trimmed-60,31213 May 2026 (the filing on sec.gov)
Point72 Asset Management LP513,814$25munder 0.1%Newnew15 May 2026 (the filing on sec.gov)
Squarepoint Ops LLC458,802$22munder 0.1%Added+331,02715 May 2026 (the filing on sec.gov)
Citadel Advisors LLC428,198$21munder 0.1%Added+382,35715 May 2026 (the filing on sec.gov)
Jane Street Group LLC351,945$17munder 0.1%Added+229,03612 May 2026 (the filing on sec.gov)
Man Group PLC280,313$14munder 0.1%Added+166,00615 May 2026 (the filing on sec.gov)
Invesco Ltd272,851$13munder 0.1%Trimmed-304,92012 May 2026 (the filing on sec.gov)
Two Sigma Investments LP161,455$7.9munder 0.1%Added+141,89015 May 2026 (the filing on sec.gov)
Fidelity (FMR LLC)134,508$6.6munder 0.1%Added+10,96815 May 2026 (the filing on sec.gov)
T. Rowe Price Associates Inc66,751$3.3munder 0.1%Trimmed-621,43515 May 2026 (the filing on sec.gov)
Tudor Investment Corp64,802$3.2munder 0.1%Trimmed-59,71415 May 2026 (the filing on sec.gov)
ExodusPoint Capital Management LP52,321$2.6munder 0.1%Trimmed-144,54114 May 2026 (the filing on sec.gov)
AQR Capital Management LLC38,710$1.9munder 0.1%Added+1,88115 May 2026 (the filing on sec.gov)
Winton Group Ltd28,459$1.4munder 0.1%Added+7,74712 May 2026 (the filing on sec.gov)
Janus Henderson Group Ltd27,234$1.3munder 0.1%Held018 May 2026 (the filing on sec.gov)
Susquehanna International Group LLP21,151$1.0munder 0.1%Newnew15 May 2026 (the filing on sec.gov)
D. E. Shaw & Co.21,077$1.0munder 0.1%Trimmed-17,62715 May 2026 (the filing on sec.gov)
Caxton Associates LLP20,192$989kunder 0.1%Trimmed-9,77514 May 2026 (the filing on sec.gov)
Schonfeld Strategic Advisors LLC14,912$731kunder 0.1%Added+6,38215 May 2026 (the filing on sec.gov)
Page 1 of 2

Largest increases and reductions, by shares

Q4 2025 to Q1 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 (4)

Exited (7)

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.
5 in Q3 2024 to 3 in Q2 2026

Tracked managers listing it, at least.

0358102015201720192020202120222023202420252026
the quarter shown share split complete books; unmarked quarters rest on listed positionsClick a quarter to open it.
CALX by quarter
QuarterHoldersReported valueBuyersSellers
Q4 20131$572kn.a.n.a.
Q4 20141$688kn.a.n.a.
Q1 20151$1.7mn.a.n.a.
Q2 20151$11mn.a.n.a.
Q3 20151$2.8mn.a.n.a.
Q2 20161$303kn.a.n.a.
Q3 20162$1.9mn.a.n.a.
Q4 20161$490kn.a.n.a.
Q1 20172$1.8mn.a.n.a.
Q2 20172$2.9mn.a.n.a.
Q3 20171$1.3mn.a.n.a.
Q3 20181$216kn.a.n.a.
Q4 20181$386kn.a.n.a.
Q1 20192$4.7mn.a.n.a.
Q2 20192$3.8mn.a.n.a.
Q4 20191$4.6mn.a.n.a.
Q1 20202$6.3mn.a.n.a.
Q2 20203$57mn.a.n.a.
Q3 20204$94mn.a.n.a.
Q4 20204$147mn.a.n.a.
Q1 20216$221mn.a.n.a.
Q2 20215$263mn.a.n.a.
Q3 20217$265mn.a.n.a.
Q4 20215$647mn.a.n.a.
Q1 20226$238mn.a.n.a.
Q2 20224$167mn.a.n.a.
Q3 20226$229mn.a.n.a.
Q4 20227$258mn.a.n.a.
Q1 202310$298mn.a.n.a.
Q2 20239$232mn.a.n.a.
Q3 20238$198mn.a.n.a.
Q4 20237$292m62
Q1 20248$230m62
Q2 20247$276m52
Q3 20245$252m15
Q4 20245$120m14
Q1 20255$135m24
Q2 20254$196m31
Q3 20259$435m63
Q4 20258$246m2012
Q1 20266$333m1618
Q2 20263$207m218

Compare with…

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

CALX and NFLX →CALX and TMUS →CALX and CMCSA →Choose a stock to compare with CALX →

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 CALX, latest filings →Back to the 13F Explorer →