Insider Transactions Reported by 11 Insiders of KOSS CORP

Symbol: KOSS on Nasdaq
Location: Milwaukee, WI

Key facts

KOSS - KOSS CORP has 11 insiders with reported activity on this page.
Net insider value flow over the last year: -$420,159.
Recent transaction rows are available for direct filing-level review.

Change

Buy value: $12,400; sell value: $432,558.
Net share flow: -78,143.

Research use

This page gives a plain-language issuer insider context before you inspect transaction-level evidence.
Use the filing links below to verify timestamps, codes, and ownership impacts directly from SEC forms.

Evidence

Filed on Form 4

Issuer insider activity is sourced from SEC Forms 3, 4, and 5.

See Original Filing

Insider trading overview

Last 12 months

Net insider flow leans to selling over the last 12 months. Net value: -$420,159.

Buys

$12,400

Shares: 2,500

Insiders: 1

Sells

$432,559

Shares: 80,643

Insiders: 2

Net

-$420,159

Shares: -78,143

Insiders: -1

Window (months)	Buy shares	Sell shares	Buy $	Sell $	Net $
0-3	0	0	$0	$0	$0
3-6	2,500	0	$12,400	$0	+$12,400
6-9	0	0	$0	$0	$0
9-12	0	80,643	$0	$432,559	-$432,559

KOSS CORP executives and other stock owners filed with the SEC include:

Name	Relationship	Holdings Value	Past Year Net Change	Change %	Valuation	Report Date
Michael J. Koss	President and CEO, Director, 10%+ Owner	$15,025,474			Mixed	17 Feb 2026
John C. Koss Jr.	Vice President - Sales	$4,713,981	-$285,305	-5.7%	Mixed	10 Jun 2025
William Jesse Sweasy	Director	$146,000			Filing P/S	02 Jun 2022
Michael J. Koss Jr.	Executive Vice President	$93,122	-$147,254	-61%	Median	06 May 2026
Lenore Lillie	Director	$12,400	+$12,400	+100%	Filing P/S	02 Dec 2025
David D. Smith	Chief Financial Officer	$226			Mixed	02 Nov 2021
Kim M. Schulte	Chief Financial Officer				Mixed	06 May 2026
Thomas L. Doerr	Director				Mixed	18 May 2021
KFT Corp	10%+ Owner				Mixed	23 Mar 2022
Theodore Nixon	Director				Mixed	28 May 2021
Koss Family Trust, Dated 9/11/12	10%+ Owner				Mixed	23 Mar 2022

Top shareholders of KOSS CORP (13F + 13D/G + 3/4/5)

Grouped by holder across the latest SEC ownership disclosures. Ownership % is shown only when it is directly reported or safely comparable across share classes.

Methodology: rows are grouped by holder and ranked by the holder's primary source value. — indicates unavailable or non-comparable values; "mixed-class rows" means the latest filing spans non-comparable classes.

Holder	Source	Role / Reporting	Ownership %	Shares	Holdings Value	12M Net Δ	As of	Details
Michael J. Koss	3/4/5	President and CEO, Director, 10%+ Owner	— class O/S missing	3,629,342	$15,025,474	—	17 Feb 2026	3/4/5
John C. Koss Jr.	3/4/5	Vice President - Sales	— class O/S missing	809,502	$4,713,981	-$285,305	10 Jun 2025	3/4/5
VANGUARD CAPITAL MANAGEMENT LLC	13F	Company	— class O/S missing	189,607	$678,793	—	31 Mar 2026	13F
BlackRock, Inc.	13F	Company	— class O/S missing	89,601	$320,771	—	31 Mar 2026	13F
GEODE CAPITAL MANAGEMENT, LLC	13F	Company	— class O/S missing	55,913	$200,202	—	31 Mar 2026	13F
William Jesse Sweasy	3/4/5	Director	— class O/S missing	20,000	$146,000	—	02 Jun 2022	3/4/5
VANGUARD FIDUCIARY TRUST CO	13F	Company	— class O/S missing	31,334	$112,176	—	31 Mar 2026	13F
Michael J. Koss Jr.	3/4/5	Executive Vice President	— mixed-class rows	160,369 mixed-class rows	$93,122	-$147,254	06 May 2026	3/4/5
DIMENSIONAL FUND ADVISORS LP	13F	Company	— class O/S missing	21,611	$77,367	—	31 Mar 2026	13F
STATE STREET CORP	13F	Company	— class O/S missing	17,974	$64,347	—	31 Mar 2026	13F
JAMES INVESTMENT RESEARCH, INC.	13F	Company	— class O/S missing	15,475	$55,401	—	31 Mar 2026	13F
NORTHERN TRUST CORP	13F	Company	— class O/S missing	14,285	$51,140	—	31 Mar 2026	13F
XTX Topco Ltd	13F	Company	— class O/S missing	10,786	$38,614	—	31 Mar 2026	13F
PNC FINANCIAL SERVICES GROUP, INC.	13F	Company	— class O/S missing	7,000	$25,060	—	31 Mar 2026	13F
UBS Group AG	13F	Company	— class O/S missing	6,113	$21,884	—	31 Mar 2026	13F
NewEdge Advisors, LLC	13F	Company	— class O/S missing	15,475	$15,475	—	31 Mar 2026	13F
Lenore Lillie	3/4/5	Director	— class O/S missing	2,500	$12,400	+$12,400	02 Dec 2025	3/4/5
Vanguard Global Advisers, LLC	13F	Company	— class O/S missing	2,040	$7,303	—	31 Mar 2026	13F
Tower Research Capital LLC (TRC)	13F	Company	— class O/S missing	1,212	$4,339	—	31 Mar 2026	13F
Activest Wealth Management	13F	Company	— class O/S missing	1,000	$3,580	—	31 Mar 2026	13F
N.E.W. Advisory Services LLC	13F	Company	— class O/S missing	1,000	$3,580	—	31 Mar 2026	13F
CREATIVE FINANCIAL DESIGNS INC /ADV	13F	Company	— class O/S missing	300	$1,074	—	31 Mar 2026	13F
SBI Securities Co., Ltd.	13F	Company	— class O/S missing	120	$430	—	31 Mar 2026	13F
MORGAN STANLEY	13F	Company	— class O/S missing	80	$286	—	31 Mar 2026	13F
David D. Smith	3/4/5	Chief Financial Officer	— mixed-class rows	20,031 mixed-class rows	$226	—	02 Nov 2021	3/4/5
OSAIC HOLDINGS, INC.	13F	Company	— class O/S missing	50	$179	—	31 Mar 2026	13F
Crewe Advisors LLC	13F	Company	— class O/S missing	20	$72	—	31 Mar 2026	13F
Parallel Advisors, LLC	13F	Company	— class O/S missing	10	$36	—	31 Mar 2026	13F
CITIGROUP INC	13F	Company	— class O/S missing	1	$4	—	31 Mar 2026	13F
Kim M. Schulte	3/4/5	Chief Financial Officer	— class O/S missing	50,000	—	—	06 May 2026	3/4/5

Recent Insider Transactions by Companies or Individuals for KOSS CORP

Showing up to 300 most recent insider transactions from the last 12 months.

Insider	Symbol	Class	Transaction	%	Value $	* Price $	Shares	Shares Owned	Date	Ownership
Kim M. Schulte	KOSS	Stock Options (Right to Buy)	Award				50,000	50,000	06 May 2026	Direct
Michael J. Koss Jr.	KOSS	Stock Options (Right to Buy)	Award				100,000	100,000	06 May 2026	Direct
Michael J. Koss	KOSS	Common Stock	Other	-100%			-12,000	0	17 Feb 2026	As co-trustee of trust for child
Lenore Lillie	KOSS	Common Stock	Purchase		$12,400	$4.96	2,500	2,500	02 Dec 2025	Direct
Michael J. Koss Jr.	KOSS	Common Stock	Sale	-48.7%	$117,794	$4.78	-24,643	26,000	13 Jun 2025	Direct
Michael J. Koss Jr.	KOSS	Common Stock	Options Exercise	94.8%			24,643	50,643	13 Jun 2025	Direct
Michael J. Koss Jr.	KOSS	Stock Option (Right to Buy)	Options Exercise	-41.8%			-24,643	34,357	13 Jun 2025	Direct
John C. Koss Jr.	KOSS	Common Stock	Sale	-0.76%	$7,530	$5.02	-1,500	196,028	12 Jun 2025	Direct
John C. Koss Jr.	KOSS	Common Stock	Options Exercise	0.77%			1,500	197,528	12 Jun 2025	Direct
John C. Koss Jr.	KOSS	Stock Option (Right to Buy)	Options Exercise	-100%			-1,500	0	12 Jun 2025	Direct
Michael J. Koss Jr.	KOSS	Common Stock	Sale	-18.8%	$29,460	$4.91	-6,000	26,000	12 Jun 2025	Direct
Michael J. Koss Jr.	KOSS	Common Stock	Options Exercise	23.1%			6,000	32,000	12 Jun 2025	Direct
Michael J. Koss Jr.	KOSS	Stock Option (Right to Buy)	Options Exercise	-9.23%			-6,000	59,000	12 Jun 2025	Direct
John C. Koss Jr.	KOSS	Common Stock	Sale	-10.7%	$132,775	$5.65	-23,500	196,028	11 Jun 2025	Direct
John C. Koss Jr.	KOSS	Common Stock	Options Exercise	12%			23,500	219,528	11 Jun 2025	Direct
John C. Koss Jr.	KOSS	Stock Option (Right to Buy)	Options Exercise	-94%			-23,500	1,500	11 Jun 2025	Direct
John C. Koss Jr.	KOSS	Common Stock	Sale	-11.3%	$145,000	$5.80	-25,000	196,028	10 Jun 2025	Direct
John C. Koss Jr.	KOSS	Common Stock	Options Exercise	12.8%			25,000	221,028	10 Jun 2025	Direct
John C. Koss Jr.	KOSS	Stock Option (Right to Buy)	Options Exercise	-50%			-25,000	25,000	10 Jun 2025	Direct

* An asterisk sign (*) next to the price indicates that the price is likely invalid.