Calix CALX Insider Ownership

NYSE CALX

$35.79 +0.15 (+0.43%)

As of: Oct 20, 2026 · 12:52 PM EDT

Insider Holdings by Owner

2.87Mn Shares

Insider Ownership Statistics

as of 30 Sep, 2026

Insider Ownership

9.46%

▼-0.118% pp QoQ

Shares Held by Insiders

6.01Mn

filed for Sep 2026

▼-1.23% QoQ

Shares Outstanding

63.52Mn

63,516,000 shares

Direct Holdings

4.42Mn

Indirect: 1.58Mn

Net Shares Traded (QoQ)

-75.00K

net selling in Sep 2026

Insiders Holding Shares

with Form 4 holdings on file

Shares Owned by Insiders

Shares held % of outstanding

Latest —

Average ownership —

Peak ownership —

Shares Purchased/Sold by Insiders

Bought Sold

Latest quarter —

Net over range —

Buying quarters —

Insider Ownership Summary

Updated Oct 5, 2026

In the last 12 months, insiders at Calix made open-market sales of $59.38 million (963K shares) and bought no shares on the open market.

Behind Calix's open-market sales in the past 12 months were 4 insiders, and no insider bought.
Carl Russo (Director and 10% owner) was CALX's largest open-market seller in the past 12 months, with $31.9 million of sales (545K shares); the latest was on July 27, 2026.
Apart from open-market trades, CALX insiders received 5.41K shares in stock awards, acquired 685K shares through option exercises and conversions and gave away 40K shares as gifts in the past 12 months.
Business Quant data puts insider holdings in CALX at 6.01Mn shares across insiders' latest Form 4 filings, or 9.46% of the 63.52Mn shares outstanding; that total is down 1.23% from 6.08Mn shares at the end of Q2 2026 and down 4.45% from 6.29Mn shares at the end of Q3 2025.
Calix insiders hold 4.42Mn shares directly (73.64% of their total) and 1.58Mn shares (26.36%) indirectly, through entities such as trusts and partnerships.
The insider holdings in Calix belong to 11 insiders who have reported on Form 4 within the past two years.
CALX's three largest insider shareholders, per their latest Form 4 filings, are Carl Russo (Director and 10% owner, 5.54Mn shares), Kevin Robert Peters (Director, 130.72K shares) and Cory Sindelar (Chief Financial Officer, 103.99K shares).
The largest insider, Carl Russo, holds 92.26% of CALX's insider total.
Over the trailing 12 months, 11 insiders reported transactions in CALX stock across 30 Form 4 filings.
Insider figures for CALX include Form 4 filings through September 29, 2026.

Form 4 Holdings

Insiders Holding CALX

Insiders 15

Shares held 2.87Mn

Of outstanding 4.52%

#	Insider	Position	Direct	Indirect	Total	Share of Insiders	Last Filed
1	Carl Russo	President And Ceo	0	1,569,188	1,569,188	54.6%	28 Jul, 2026
2	Donald J Listwin	Director	497,533	0	497,533	17.3%	04 Aug, 2023
3	Michael T Everett	Director	196,779	0	196,779	6.9%	05 Dec, 2022
4	Kevin Robert Peters	Director	130,717	0	130,717	4.6%	12 May, 2025
5	Cory Sindelar	Chief Financial Officer	103,994	0	103,994	3.6%	17 Feb, 2026
6	Kevin A Denuccio	Director	80,000	0	80,000	2.8%	04 May, 2022
7	Christopher J Bowick	Director	71,583	0	71,583	2.5%	18 May, 2026
8	Kathleen M Crusco	Director	64,361	0	64,361	2.2%	18 May, 2026
9	Michael Matthews	Director	64,000	0	64,000	2.2%	03 Nov, 2022
10	Kira Makagon	Director	43,931	0	43,931	1.5%	18 May, 2026
11	Michael Weening	President Ceo	16,556	0	16,556	0.6%	17 Feb, 2026
12	Wade Oosterman	Director	12,156	0	12,156	0.4%	18 May, 2026
13	Michael J Berry	Director	9,656	0	9,656	0.3%	18 May, 2026
14	Rajatish Mukherjee	Director	9,656	0	9,656	0.3%	18 May, 2026
15	John Durocher	Coo	2,367	0	2,367	0.1%	17 Feb, 2026

Each row is that insider’s most recently reported position, from Form 4 filings over the last 60 months — which is why this total does not tie to the quarterly series above, where a quarter counts only the insiders who filed in it. Shares held through a fund or institutional portfolio are counted on the institutional ownership page instead.

Form 4 Filings

988 Insider Transactions

Source SEC Form 4

Latest quarter Sep 2026

Date	Insider	Position	Transaction	Shares	Price	Value	Shares Held After	Ownership
28 Sep, 2026	Carl Russo	Director, TenPercentOwner	Acquired A	17,603	$0.00	$0	17,603	Direct
27 Jul, 2026	Carl Russo	Director, TenPercentOwner	Disposed S	75,000	$36.20	$2.71Mn	1,569,188	Indirect
29 Jun, 2026	Carl Russo	Director, TenPercentOwner	Acquired A	15,999	$0.00	$0	15,999	Direct
14 May, 2026	Kira Makagon	Director	Acquired A	4,967	$0.00	$0	43,931	Direct
14 May, 2026	Michael J Berry	Director	Acquired A	4,967	$0.00	$0	9,656	Direct
14 May, 2026	Kathleen M Crusco	Director	Acquired A	4,967	$0.00	$0	64,361	Direct
14 May, 2026	Wade Oosterman	Director	Acquired A	4,967	$0.00	$0	12,156	Direct
14 May, 2026	Christopher J Bowick	Director	Acquired A	4,967	$0.00	$0	71,583	Direct
14 May, 2026	Carl Russo	Director, TenPercentOwner	Acquired A	4,967	$0.00	$0	3,958,037	Direct
14 May, 2026	Rajatish Mukherjee	Director	Acquired A	4,967	$0.00	$0	9,656	Direct
27 Apr, 2026	Carl Russo	Director, TenPercentOwner	Disposed S	20,909	$43.17	$902.62K	1,648,279	Indirect
27 Apr, 2026	Carl Russo	Director, TenPercentOwner	Disposed S	4,091	$43.75	$178.98K	1,644,188	Indirect
08 Apr, 2026	Carl Russo	Director, TenPercentOwner	Disposed G	40,000	$0.00	$0	3,953,070	Direct
30 Mar, 2026	Carl Russo	Director, TenPercentOwner	Acquired A	11,753	$0.00	$0	11,753	Direct
25 Feb, 2026	Carl Russo	Director, TenPercentOwner	Acquired M	10,000	$12.63	$126.30K	3,993,070	Direct
25 Feb, 2026	Carl Russo	Director, TenPercentOwner	Disposed M	10,000	$0.00	$0	560,000	Direct
14 Feb, 2026	Cory Sindelar	Chief Financial Officer	Acquired A	439	$45.32	$19.90K	103,994	Direct
12 Feb, 2026	Shane Todd Marshall Eleniak	Chief Product Officer	Acquired A	195,000	$0.00	$0	195,000	Direct
14 Feb, 2026	John Durocher	Coo	Acquired A	439	$45.32	$19.90K	2,367	Direct
14 Feb, 2026	Michael Weening	President Ceo	Acquired A	439	$45.32	$19.90K	16,556	Direct

Showing 1 to 20 of 988 transactions