Byline Bancorp BY Insider Ownership

NYSE BY

$37.11 -0.17 (-0.46%)

As of: Oct 19, 2026 · 3:59 PM EDT

Insider Holdings by Owner

47.88Mn Shares

Insider Ownership Statistics

as of 30 Sep, 2026

Insider Ownership

28.00%

▼-0.786% pp QoQ

Shares Held by Insiders

12.65Mn

filed for Sep 2026

▼-2.73% QoQ

Shares Outstanding

45.19Mn

45,191,493 shares

Direct Holdings

12.49Mn

Indirect: 164.08K

Net Shares Traded (QoQ)

-355.31K

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 10, 2026

Over the past year, BY insiders bought $59,677 of stock (1.78K shares) and sold $13.37 million (350.08K shares) on the open market.

A count shows 4 insiders buying BY stock on the open market over the past 12 months and 5 insiders selling.
Among BY insiders, Brian F. Doran (General Counsel) bought the most stock on the open market in the past 12 months: $24,847 (750 shares), most recently on February 17, 2026.
On the selling side, Perochena Antonio Del Valle (Director and 10% owner) sold the most Byline Bancorp stock on the open market over the past 12 months, $11.73 million (300K shares), most recently on August 7, 2026.
The latest open-market trade on record is a purchase of 300 shares for $11,519 by Mary Jo S. Herseth (Director) on August 19, 2026.
In transactions other than open-market trades, Byline Bancorp insiders received 144.71K shares in stock awards and gave up 44.93K shares to cover taxes or exercise prices over the past 12 months.
According to Business Quant data, insiders at Byline Bancorp reported 12.65Mn shares in total in their latest Form 4 filings, down 2.73% from 13.01Mn shares at the end of Q2 2026 and down 2.22% from 12.94Mn shares at the end of Q3 2025.
Byline Bancorp insiders hold 12.49Mn shares directly (98.70% of their total) and 164.08K shares (1.30%) indirectly, through entities such as trusts and partnerships.
Business Quant counts 21 insiders with holdings in Byline Bancorp stock, among the officers, directors and 10% owners who have filed a Form 4 in the past two years.
BY's largest insider holders by reported holdings are MBG Investors I, L.P. (10% owner, 11.54Mn shares), Roberto R. Herencia (Chief Executive Officer, 430.83K shares) and Alberto J. Paracchini (President, 194.28K shares).
MBG Investors I, L.P. alone accounts for 91.16% of the shares held by Byline Bancorp insiders.
Institutions accounted for 55.15% of BY's outstanding shares in Q2 2026, insiders about 28.00% per their latest Form 4 filings, and other investors, including the public, about 16.85%.
Over the trailing 12 months, 20 insiders reported transactions in BY stock across 32 Form 4 filings.
The insider holdings and trades above for Byline Bancorp reflect Form 4 filings through August 20, 2026.

Form 4 Holdings

Insiders Holding BY

Insiders 25

Shares held 47.88Mn

Of outstanding 105.95%

#	Insider	Position	Direct	Indirect	Total	Share of Insiders	Last Filed
1	Investors I, L.P. Mbg	TenPercentOwner	23,090,746	0	23,090,746	48.2%	11 Aug, 2026
2	Valle Perochena Antonio Del	Director, TenPercentOwner	0	23,045,746	23,045,746	48.1%	11 Aug, 2026
3	Roberto R Herencia	Chief Executive Officer	668,384	0	668,384	1.4%	14 Aug, 2026
4	Alberto J Paracchini	President	339,895	0	339,895	0.7%	24 Feb, 2026
5	Thomas Abraham	President, Sbc	157,715	0	157,715	0.3%	20 Apr, 2026
6	Steven P. Kent	Director	0	89,750	89,750	0.2%	13 Jun, 2025
7	Thomas J Iii Bell	Evp Chief Financial Officer	77,403	0	77,403	0.2%	24 Feb, 2026
8	Lindsay Y Corby	Evp And Cfo	54,139	0	54,139	0.1%	10 Jun, 2022
9	Megan Biggam	Evp Head Of Community Banking	44,172	0	44,172	0.1%	24 Feb, 2026
10	Brogan Ptacin	Head Of Commercial Banking	41,427	0	41,427	0.1%	04 Aug, 2026
11	John Barkidjija	Head Of Cre Specialty Fin	39,983	0	39,983	0.1%	27 Feb, 2026
12	Mark Fucinato	Chief Credit Officer	35,183	0	35,183	0.1%	24 Feb, 2026
13	Mary Jo S. Herseth	Director	11,602	19,100	30,702	0.1%	20 Aug, 2026
14	Nicolas Mando	Chief Technology Operations	20,503	0	20,503	0.0%	24 Feb, 2026
15	Dana Rose	Chief Human Resources Officer	20,373	0	20,373	0.0%	12 Aug, 2026
16	Phillip R. Cabrera	Director	15,871	4,129	20,000	0.0%	29 Jan, 2026
17	Maria Sherylle A Olano	Svp, Chief Accounting Officer	18,768	0	18,768	0.0%	24 Feb, 2026
18	William G Kistner	Director	2,371	14,289	16,660	0.0%	20 Aug, 2026
19	Michelle Lynn Johnson	Chief Risk Officer	14,280	0	14,280	0.0%	24 Feb, 2026
20	Carlos Ruiz Sacristan	Director	13,533	0	13,533	0.0%	10 Jun, 2026
21	Hart Angela E Major	Evp, Head Of Wealth Management	10,958	0	10,958	0.0%	24 Feb, 2023
22	Pamela C Stewart	Director	8,822	0	8,822	0.0%	08 Aug, 2024
23	Velez Margarita Hugues	Director	8,722	0	8,722	0.0%	10 Jun, 2026
24	Ana Casanueva	Svp, Director Of Legal	8,076	0	8,076	0.0%	29 Feb, 2024
25	Brian F Doran	General Counsel	2,533	0	2,533	0.0%	24 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

683 Insider Transactions

Source SEC Form 4

Latest quarter Sep 2026

Date	Insider	Position	Transaction	Shares	Price	Value	Shares Held After	Ownership
19 Aug, 2026	Mary Jo S. Herseth	Director	Acquired P	300	$38.40	$11.52K	19,100	Indirect
19 Aug, 2026	William G Kistner	Director	Acquired P	100	$38.30	$3.83K	14,289	Indirect
13 Aug, 2026	Roberto R Herencia	Chief Executive Officer	Disposed S	19,750	$39.21	$774.31K	411,643	Direct
12 Aug, 2026	Dana Rose	Chief Human Resources Officer	Disposed S	2,421	$39.00	$94.42K	11,605	Direct
07 Aug, 2026	Investors I, L.P. Mbg	TenPercentOwner	Disposed S	300,000	$39.10	$11.73Mn	11,535,145	Direct
07 Aug, 2026	Valle Perochena Antonio Del	Director, TenPercentOwner	Disposed S	300,000	$39.10	$11.73Mn	11,535,145	Indirect
03 Aug, 2026	Brogan Ptacin	Head Of Commercial Banking	Acquired A	9,450	$12.70	$120.02K	35,309	Direct
03 Aug, 2026	Brogan Ptacin	Head Of Commercial Banking	Disposed D	9,450	$39.61	$374.32K	25,859	Direct
03 Aug, 2026	Brogan Ptacin	Head Of Commercial Banking	Disposed M	9,450	$0.00	$0	0	Direct
08 Jun, 2026	Carlos Ruiz Sacristan	Director	Acquired A	1,533	$0.00	$0	13,533	Direct
08 Jun, 2026	Velez Margarita Hugues	Director	Acquired A	1,533	$0.00	$0	8,722	Direct
02 Jun, 2026	Velez Margarita Hugues	Director	Disposed F	530	$33.41	$17.71K	7,189	Direct
04 May, 2026	William G Kistner	Director	Acquired P	100	$31.97	$3.20K	14,189	Indirect
16 Apr, 2026	Thomas Abraham	President, Sbc	Acquired A	2,406	$0.00	$0	45,539	Direct
16 Mar, 2026	Mary Jo S. Herseth	Director	Acquired P	300	$30.83	$9.25K	18,800	Indirect
26 Feb, 2026	John Barkidjija	Head Of Cre Specialty Fin	Disposed S	4,509	$32.33	$145.78K	19,243	Direct
22 Feb, 2026	Nicolas Mando	Chief Technology Operations	Acquired A	2,231	$0.00	$0	15,297	Direct
22 Feb, 2026	Alberto J Paracchini	President	Acquired A	11,303	$0.00	$0	192,405	Direct
22 Feb, 2026	Thomas J Iii Bell	Evp Chief Financial Officer	Acquired A	5,849	$0.00	$0	56,886	Direct
22 Feb, 2026	Roberto R Herencia	Chief Executive Officer	Acquired A	24,809	$0.00	$0	418,710	Direct

Showing 1 to 20 of 683 transactions