CALX insider ownership: who sold, why, and what they still hold

What stands out

Two officers sold $8.1M with no disclosed plan: Shane Eleniak ($4.8M) and Cory Sindelar ($3.3M). The filings don't state a reason.Shane Eleniak: largest such sale, Nov 4, 2025 · Cory Sindelar: largest such sale, Nov 6, 2025

A share of stake is shown for 0 of the 4 officers and directors who sold. 12 are left out

Left out: Carl Russo, Kevin Peters, Cory Sindelar, Shane Eleniak, Christopher Bowick, Kathleen Crusco, Kira Makagon, Michael Weening, Wade Oosterman, Rajatish Mukherjee, Michael Berry and John Durocher (share of stake is being verified).

Disclosed company stock is not an insider's whole wealth.

Who sold, and how much of their stake

Officers and directors, past 12 months. Their share of stake is being verified and is not shown yet; amounts and trading plans are below.

Carl Russo

Director

Not confirmed

Share of stake not shown: share of stake is being verified. Why

$31.9MDisclosed plan

Michael Weening

President & CEO, Director

Not confirmed

Share of stake not shown: share of stake is being verified. Why

$18.1MDisclosed plan

Shane Eleniak

Chief Product Officer

Not confirmed

Share of stake not shown: share of stake is being verified. Why

$4.8MNo plan disclosed

Cory Sindelar

Chief Financial Officer

Not confirmed

Share of stake not shown: share of stake is being verified. Why

$4.6M29% planned 71% no plan disclosed

Amounts, filings and trading plans for each seller

Selling by month

Officers and directors, Oct 2025 to Oct 2026. Each sale is counted once: under a disclosed plan, else to cover taxes, else no plan disclosed.

Disclosed planNo plan disclosedOne dollar scale for every month; the tallest bar is labeled

Recent activity

Past 30 days, Sep 14, 2026 to Oct 13, 2026

No officer or director trades were reported for the past 30 days. The most recent before that:

Jul 27, 2026Carl Russo sold 75K shares ($2.7M) under a disclosed trading plan.

Who	Shares	Price	% of total stake	Total stake after	Trade date	Filed
Carl Russo Director	75,000	$36.20	n/a	n/a	Jul 27, 2026	Jul 28, 2026

Common questions

Is the Calix, Inc CEO selling stock?

Yes. Michael Weening sold 274K shares ($18.1M) in the past 12 months, all of it under a trading plan disclosed in the filings.

Why are Calix, Inc insiders selling?

Filings rarely give a reason, and we don't guess at one. What they show is how the sales were made: 86% of sales by value ran under 10b5-1 trading plans disclosed in the filings and 14% had no disclosed plan. A trading plan schedules sales in advance.

Are any Calix, Inc insiders buying?

No. Officers and directors reported no purchases in the past 12 months.

The evidence

Who sold4 officers and directors: amount, % of holdings, trading plan

Who sold	Amount	% of holdings	Trading plan
Carl Russo Director	$31.9M 545K shares	Not confirmed share of stake is being verified. Why	Disclosed plan
Michael Weening President & CEO, Director	$18.1M 274K shares	Not confirmed share of stake is being verified. Why	Disclosed plan
Shane Eleniak Chief Product Officer	$4.8M 74K shares	Not confirmed share of stake is being verified. Why	No plan disclosed
Cory Sindelar Chief Financial Officer	$4.6M 70K shares	Not confirmed share of stake is being verified. Why	29% under a disclosed plan 71% no plan disclosed

The full ownership picture0 of 12 officers and directors confirmed

Vested shares across all share classes, held directly and through trusts, LLCs and family members, as reported on SEC Forms 3, 4 and 5. Unvested awards and options are never counted as owned shares.

Insider

Held Oct 13, 2025

Sold

Held Oct 13, 2026

Still held

Carl Russo

Holdings and share of stake are being verified. Share-of-stake figures and holdings for this company are held back while they are verified. Sales and other transactions for Carl Russo are complete.

Director

n/a

−545K

n/a

Vesting, gifts, unvested awards and holding lines for Carl Russo

Holdings and share of stake are being verified. Sales, proceeds, plan and tax status and dates for Carl Russo are complete; balances and unit counts will be added when the check is finished.

−40Kgifted (net of own trusts)

Stock options (not counted as shares):

Options held	Strike price	Expires	Intrinsic value (estimate)
560,000	$12.63	May 22, 2030	$13.2M
12,262	$30.07	May 9, 2034	$75K
28,606	$42.65	May 8, 2035	$0
11,561	$53.19	Jun 30, 2035	$0
10,329	$61.38	Sep 29, 2035	$0
11,663	$53.59	Jan 2, 2036	$0
11,753	$49.40	Mar 30, 2036	$0
15,999	$36.05	Jun 29, 2036	$2K
17,603	$33.19	Sep 28, 2036	$53K

Estimate: options held × ($36.20 − strike price), using the most recent insider trade price on Form 4 (Jul 27, 2026), not a market close.

Kevin Peters

Holdings and share of stake are being verified. Share-of-stake figures and holdings for this company are held back while they are verified. See the filing Sales and other transactions for Kevin Peters are complete.

Director

n/a

Vesting, gifts, unvested awards and holding lines for Kevin Peters

Holdings and share of stake are being verified. Sales, proceeds, plan and tax status and dates for Kevin Peters are complete; balances and unit counts will be added when the check is finished.

0gifted (net of own trusts)

Stock options (not counted as shares):

Options held	Strike price	Expires	Intrinsic value (estimate)
12,262	$30.07	May 9, 2034	$75K

Estimate: options held × ($36.20 − strike price), using the most recent insider trade price on Form 4 (Jul 27, 2026), not a market close.

Cory Sindelar

Chief Financial Officer

n/a

−70K

n/a

Vesting, gifts, unvested awards and holding lines for Cory Sindelar

Holdings and share of stake are being verified. Sales, proceeds, plan and tax status and dates for Cory Sindelar are complete; balances and unit counts will be added when the check is finished.

0gifted (net of own trusts)

Stock options (not counted as shares):

Options held	Strike price	Expires	Intrinsic value (estimate)
148,000	$5.05	Oct 1, 2027	$4.6M
54,500	$51.55	Feb 9, 2033	$0
107,775	$34.26	Feb 8, 2034	$209K
68,850	$34.26	Feb 8, 2034	$133K
170,000	$39.68	Jan 31, 2035	$0
170,000	$39.68	Jan 31, 2035	$0

Estimate: options held × ($36.20 − strike price), using the most recent insider trade price on Form 4 (Jul 27, 2026), not a market close.

Shane Eleniak

Chief Product Officer

n/a

−74K

n/a

Vesting, gifts, unvested awards and holding lines for Shane Eleniak

Holdings and share of stake are being verified. Sales, proceeds, plan and tax status and dates for Shane Eleniak are complete; balances and unit counts will be added when the check is finished.

0gifted (net of own trusts)

Stock options (not counted as shares):

Options held	Strike price	Expires	Intrinsic value (estimate)
24,000	$8.03	Feb 14, 2029	$676K
109,000	$51.55	Feb 9, 2033	$0
107,775	$34.26	Feb 8, 2034	$209K
68,850	$34.26	Feb 8, 2034	$133K
195,000	$39.68	Jan 31, 2035	$0
195,000	$39.68	Jan 31, 2035	$0

Estimate: options held × ($36.20 − strike price), using the most recent insider trade price on Form 4 (Jul 27, 2026), not a market close.

Christopher Bowick

Director

n/a

Vesting, gifts, unvested awards and holding lines for Christopher Bowick

Holdings and share of stake are being verified. Sales, proceeds, plan and tax status and dates for Christopher Bowick are complete; balances and unit counts will be added when the check is finished.

0gifted (net of own trusts)

Stock options (not counted as shares):

Options held	Strike price	Expires	Intrinsic value (estimate)
12,262	$30.07	May 9, 2034	$75K

Estimate: options held × ($36.20 − strike price), using the most recent insider trade price on Form 4 (Jul 27, 2026), not a market close.

Kathleen Crusco

Director

n/a

Vesting, gifts, unvested awards and holding lines for Kathleen Crusco

Holdings and share of stake are being verified. Sales, proceeds, plan and tax status and dates for Kathleen Crusco are complete; balances and unit counts will be added when the check is finished.

0gifted (net of own trusts)

Stock options (not counted as shares):

Options held	Strike price	Expires	Intrinsic value (estimate)
12,262	$30.07	May 9, 2034	$75K

Estimate: options held × ($36.20 − strike price), using the most recent insider trade price on Form 4 (Jul 27, 2026), not a market close.

Kira Makagon

Director

n/a

Vesting, gifts, unvested awards and holding lines for Kira Makagon

Holdings and share of stake are being verified. Sales, proceeds, plan and tax status and dates for Kira Makagon are complete; balances and unit counts will be added when the check is finished.

0gifted (net of own trusts)

Stock options (not counted as shares):

Options held	Strike price	Expires	Intrinsic value (estimate)
12,262	$30.07	May 9, 2034	$75K

Estimate: options held × ($36.20 − strike price), using the most recent insider trade price on Form 4 (Jul 27, 2026), not a market close.

Michael Weening

President & CEO, Director

n/a

−274K

n/a

Vesting, gifts, unvested awards and holding lines for Michael Weening

Holdings and share of stake are being verified. Sales, proceeds, plan and tax status and dates for Michael Weening are complete; balances and unit counts will be added when the check is finished.

0gifted (net of own trusts)

Stock options (not counted as shares):

Options held	Strike price	Expires	Intrinsic value (estimate)
54,500	$51.55	Feb 9, 2033	$0
125,737	$34.26	Feb 8, 2034	$244K
80,325	$34.26	Feb 8, 2034	$156K
217,500	$39.68	Jan 31, 2035	$0
217,500	$39.68	Jan 31, 2035	$0

Estimate: options held × ($36.20 − strike price), using the most recent insider trade price on Form 4 (Jul 27, 2026), not a market close.

Wade Oosterman

Director

n/a

Vesting, gifts, unvested awards and holding lines for Wade Oosterman

Holdings and share of stake are being verified. Sales, proceeds, plan and tax status and dates for Wade Oosterman are complete; balances and unit counts will be added when the check is finished.

0gifted (net of own trusts)

Stock options (not counted as shares):

Options held	Strike price	Expires	Intrinsic value (estimate)
7,317	$37.68	Aug 8, 2034	$0

Estimate: options held × ($36.20 − strike price), using the most recent insider trade price on Form 4 (Jul 27, 2026), not a market close.

Rajatish Mukherjee

Director

n/a

Vesting, gifts, unvested awards and holding lines for Rajatish Mukherjee

Holdings and share of stake are being verified. Sales, proceeds, plan and tax status and dates for Rajatish Mukherjee are complete; balances and unit counts will be added when the check is finished.

0gifted (net of own trusts)

Stock options (not counted as shares):

Options held	Strike price	Expires	Intrinsic value (estimate)
12,262	$30.07	May 9, 2034	$75K

Estimate: options held × ($36.20 − strike price), using the most recent insider trade price on Form 4 (Jul 27, 2026), not a market close.

Michael Berry

Director

n/a

Vesting, gifts, unvested awards and holding lines for Michael Berry

Holdings and share of stake are being verified. Sales, proceeds, plan and tax status and dates for Michael Berry are complete; balances and unit counts will be added when the check is finished.

0gifted (net of own trusts)

John Durocher

COO

n/a

Vesting, gifts, unvested awards and holding lines for John Durocher

Holdings and share of stake are being verified. Sales, proceeds, plan and tax status and dates for John Durocher are complete; balances and unit counts will be added when the check is finished.

0gifted (net of own trusts)

Stock options (not counted as shares):

Options held	Strike price	Expires	Intrinsic value (estimate)
200,000	$51.83	Mar 24, 2033	$0
42,555	$51.83	Mar 24, 2033	$0
107,775	$34.26	Feb 8, 2034	$209K
56,350	$34.26	Feb 8, 2034	$109K
195,000	$39.68	Jan 31, 2035	$0
195,000	$39.68	Jan 31, 2035	$0

Estimate: options held × ($36.20 − strike price), using the most recent insider trade price on Form 4 (Jul 27, 2026), not a market close.

Holdings and share of stake for Calix, Inc are being verified, so no balances, unit counts or percentages are shown. Sales, proceeds, plan and tax status, titles and dates come straight from individual filings.

What explains the selling$59.4M of sales by plan status, purpose, seller and month

Officer and director open-market sales: $59.4M across 963,000 shares. Plan status and stated purpose are separate questions, and a sale can have both.

By plan status

Disclosed plan · $51.3M · 86%

14%

The lighter segment is sales with no plan disclosed in the filing ($8.1M), including tax-related sales outside a plan.

No plan disclosed · $8.1M

Sales with no 10b5-1 plan and no tax reference in the filing. $4.8M of it is Shane Eleniak. No plan disclosed is a statement about the filing, not about why the sale happened. Largest such sale: Shane Eleniak, Nov 4, 2025

Seller	Shares sold	Proceeds	Under a disclosed plan	Share of total	Sales dates
Carl Russo Director	545K	$31.9M	100%	54%	Nov 4, 2025 to Jul 27, 2026
Michael Weening President & CEO, Director	274K	$18.1M	100%	30%	Oct 30, 2025 to Nov 3, 2025
Shane Eleniak Chief Product Officer	74K	$4.8M	0%	8%	Nov 4, 2025 to Nov 10, 2025
Cory Sindelar Chief Financial Officer	70K	$4.6M	29%	8%	Oct 30, 2025 to Nov 6, 2025

Sales by month

Month	Sale proceeds	Disclosed plan	To cover taxes	No plan disclosed
Oct 2025	$14.4M	$14.4M	$0	$0
Nov 2025	$40.0M	$31.9M	$0	$8.1M
Dec 2025	$0	$0	$0	$0
Jan 2026	$0	$0	$0	$0
Feb 2026	$1.2M	$1.2M	$0	$0
Mar 2026	$0	$0	$0	$0
Apr 2026	$1.1M	$1.1M	$0	$0
May 2026	$0	$0	$0	$0
Jun 2026	$0	$0	$0	$0
Jul 2026	$2.7M	$2.7M	$0	$0
Aug 2026	$0	$0	$0	$0
Sep 2026	$0	$0	$0	$0
Oct 2026	$0	$0	$0	$0

Is this normal? Selling year by year5 earlier years to compare with

More than usual: about 1.9x the 5-year average. 4 insiders sold; the average is 5 a year.

12 months ending	Shares sold	Insiders who sold	Proceeds
Oct 13, 2026 Latest 12 months	963K	4	$59.4M
Oct 13, 2025 1 year earlier	830K	3	$45.8M
Oct 13, 2024 2 years earlier	85K	2	$2.9M
Oct 14, 2023 3 years earlier	272K	6	$16.4M
Oct 14, 2022 4 years earlier	409K	8	$23.5M
Oct 14, 2021 5 years earlier	945K	6	$40.8M

Open-market sales (Form 4 code S) by people who were officers or directors, in split-adjusted shares. Earlier years include people who have since left. A sale that an outside holder also reports (a family trust, a fund) is counted with outside holders in every year. Shares, not dollars, are compared, so a change in the stock price doesn't look like a change in selling. Years the filings don't fully cover are shown but left out of the average.

Known gaps and uncertainty12 officers and directors not confirmed

Holdings and share of stake are being verified. Balances, unit counts and every share-of-stake figure for Calix, Inc are held back until that check is finished. Sales, proceeds, plan and tax status, titles and dates come straight from individual filings and are complete.

External context: we only cite outside events when a documented connection exists. None is shown for this period.

Sources and methodology613 filings on record, 32 filed in the 12-month period, and how we read them

All 613 Forms 3, 4 and 5 on record for Calix, Inc (SEC CIK 1406666), filed from Mar 23, 2010 to Sep 29, 2026; 32 of them were filed in the 12 months this page covers, retrieved from SEC EDGAR on Oct 13, 2026. Prices are the ones reported in each filing, often weighted averages.

Holdings. Each holding line (a share class plus an owner, such as a trust or LLC) carries its last reported balance forward. Entities first reported during the period start at zero, so transfers between an insider's own trusts don't count as selling. Lines not reported for three years or more are listed separately and left out of totals.

Sales. A sale counts as under a 10b5-1 plan if its footnote cites one or the filing's Rule 10b5-1 box is checked, and as tax-related if its footnote cites tax obligations or sell-to-cover. Shares withheld by the company for taxes are listed separately. Sales with neither attribute are labeled "no plan disclosed".

Full methodology

Former or inactive filers (29)No filing in 18 months; last reported balances, not in any total

Name	Last filed	Last reported balance
John Collins	Feb 4, 2025	No balance on record
Eleanor Fields	May 13, 2024	8,183 shares, last reported balance as of May 11, 2023
Donald Listwin	Aug 4, 2023	1,117,533 shares, last reported balance as of Aug 4, 2023
Michael Everett	Dec 5, 2022	196,779 shares, last reported balance as of Dec 2, 2022
Michael Matthews	Nov 3, 2022	64,000 shares, last reported balance as of Nov 2, 2022
Kevin Denuccio	May 4, 2022	81,423 shares, last reported balance as of May 2, 2022
Daniel Plants	Oct 29, 2021	166,599 shares, last reported balance as of Oct 28, 2021
Sheila Cheung	Feb 26, 2018	No balance on record
Gregory Billings	Nov 3, 2017	No balance on record
Michael Flynn	May 19, 2017	108,027 shares, last reported balance as of May 17, 2017
William Atkins	Mar 2, 2017	6,000 shares, last reported balance as of Feb 28, 2017
John Colvin	Jul 22, 2016	163,665 shares, last reported balance as of Jul 20, 2016
Thomas Pardun	May 20, 2016	78,512 shares, last reported balance as of May 18, 2016
Andy Lockhart	Feb 12, 2016	28,753 shares, last reported balance as of Feb 10, 2016
Adam Grosser	Jun 1, 2015	46,362 shares, last reported balance as of May 20, 2015
Adam Grosser	Jun 1, 2015	No balance on record
Mehdi Bradaran	Aug 19, 2014	35,532 shares, last reported balance as of Aug 16, 2014
Tony Banta	Aug 5, 2014	10,000 shares, last reported balance as of Aug 5, 2014
Michel Langlois	Jul 30, 2014	No balance on record
Kevin Pope	Jul 23, 2014	86,735 shares, last reported balance as of Jul 20, 2014
Michael Ashby	Feb 19, 2014	2,987,758 shares, last reported balance as of Feb 14, 2014
Roger Weingarth	Nov 29, 2013	45,000 shares, last reported balance as of Nov 27, 2013
CALIX, INC	Dec 26, 2012	6,013,763 shares, last reported balance as of Dec 23, 2012
Kelyn Brannon	Mar 2, 2011	35,719 shares, last reported balance as of Mar 1, 2011
Michael Marks	Dec 8, 2010	39,132 shares, last reported balance as of Dec 7, 2010
Paul Ferris	Apr 22, 2010	4,533 shares, last reported balance as of Apr 22, 2010
Robert Finzi	Apr 22, 2010	22,718 shares, last reported balance as of Apr 22, 2010
Paul Ferris	Apr 22, 2010	2,644,743 shares, last reported balance as of Apr 22, 2010
Robert Finzi	Apr 22, 2010	1,027,832 shares, last reported balance as of Apr 22, 2010

Spotted something wrong on this page? Report an error. We check every report against the SEC filing and list what we fix in the corrections log.

Calix, Inc insiders sold $59.4M in the past 12 months. How much of their stake is that?

What stands out

Who sold, and how much of their stake

Selling by month

Recent activity

Common questions

Is the Calix, Inc CEO selling stock?

Why are Calix, Inc insiders selling?

Are any Calix, Inc insiders buying?

The evidence

No plan disclosed · $8.1M

Sales by month