$OSS

$5.98 +$0.07 (1.18%) Close

$OSS Overview Financial Statements SEC Filings Executives News Red Flags Capital Raising Ownership Insider Transactions Congressional Trades

Ownership

13F as of Q2 2026 · 24.9M shares outstanding

Who owns OSS?

By type of holder

Institutions 42.7% Insiders 5.9% Everyone else 51.4%

Concentration Top 10 holders own 38.1%

BlackRock, Inc. 7.4% · Jane Street Group, LLC 5.3%

Institutional ownership

42.7%

+9.3 pts vs last qtr

Institutional holders

108

+31 vs last qtr

Net shares bought

+2.3M

by institutions in Q2 2026

New / sold out

51 / 20

positions opened vs closed

How is ownership changing?

Institutions, last 8 quarters

Biggest buyers in Q2 2026

BlackRock, Inc. +1.2M
Jane Street Group, LLC +434.9K

Biggest sellers in Q2 2026

Marshall Wace, LLP SOLD OUT −419.0K
Morgan Stanley −343.0K

Who is planning to sell?

Notices of proposed sale, last 12 months

$369K

3 notices from 3 people

Shares covered

21.0K

0.08% of the company

Arranged in advance

of the value is under a 10b5-1 plan

Under a 10b5-1 plan No plan

Largest proposed sellers

Bassett David George Director $143K
Matz Gregory W Director $138K

Every notice on Red Flags →

A Form 144 is notice of a planned sale, not the sale itself. What insiders actually sold is on Insider Transactions.

Is your stake being diluted?

Diluted share count, FY2017–FY2025

+117.1%

+10.17% a year

Each share's claim on the business

−53.9%

shrank without buying or selling a share

Spent on buybacks vs paid in stock

— vs $11.8M

over 9 fiscal years

Diluted shares, split-adjusted

Buybacks Stock-based comp

How patient are the owners?

Institutional shares by how long they've been held

5+ years50% 3–5 years1% 1–3 years17% Under 1 year32%

Quarterly turnover

46.8%

of institutional shares changed hands

Top 10 managers, median time held

5 years

Super Investors

Investment managers reporting OSS on Form 13F

Holder	Shares	% of company	Change vs last qtr	Held since	% of their book
B BlackRock, Inc.	1.8M	7.37%	+1.2M (+207.7%)	≤2021	0.0%
Shares held by quarter Peak holding1.8M (Q2'26) Change over 8 quarters+1.7M Share of the company7.370% BlackRock, Inc.'s full portfolio →
JS Jane Street Group, LLC	1.3M	5.25%	+434.9K (+49.7%)	2024	0.0%
Shares held by quarter Peak holding1.3M (Q2'26) Change over 8 quarters+1.3M Share of the company5.250% Jane Street Group, LLC's full portfolio →

BlackRock, Inc.

1.8M

% of company

7.37%

Change vs last qtr

+1.2M (+207.7%)

Held since

≤2021

Jane Street Group, LLC

1.3M

% of company

5.25%

Change vs last qtr

+434.9K (+49.7%)

Held since

2024

28 more super investors behind a free account

See every manager holding One Stop Systems Inc, how their position has changed, and how long they've held it.

Institutional Funds

Mutual funds and ETFs reporting OSS on Form N-PORT; together they hold 11.5% of the company

Fund	Position value	Shares	% of company	% of the fund	As of
VT Vanguard Total Stock Market Index Fund Vanguard Index Funds	$12.6M	693.6K	2.78%	0.00%	June 30, 2026
IR iShares Russell 2000 ETF iShares Trust	$10.5M	577.0K	2.31%	0.01%	June 30, 2026

Vanguard Total Stock Market Index Fund

Vanguard Index Funds

Position value

$12.6M

% of company

2.78%

% of the fund

0.00%

As of

June 30, 2026

iShares Russell 2000 ETF

iShares Trust

Position value

$10.5M

% of company

2.31%

% of the fund

0.01%

As of

June 30, 2026

23 more funds behind a free account

See every fund holding One Stop Systems Inc and how much of the fund the position is.

Insiders and 5%+ holders

From Forms 3/4/5 and Schedules 13D/G

Holder	Shares	% of company	Change vs last qtr	8 quarters	Held since	% of their book
MJ Manko Joseph M. Jr. 5%+ holder 13D · 4.3%	938.3K	3.76%	—	—	—	—
This holder reports through Schedule 13D/G, not a quarterly 13F. Share of the company3.760% Disclosed stake13D · 4.3% View the 13D/G filing →
HC Horton Capital Management, LLC 5%+ holder 13D · 4.2%	917.3K	3.68%	—	—	—	—
This holder reports through Schedule 13D/G, not a quarterly 13F. Share of the company3.680% Disclosed stake13D · 4.2% View the 13D/G filing →

Manko Joseph M. Jr.

5%+ holder13D · 4.3%

938.3K

% of company

3.76%

Change vs last qtr

—

Held since

—

Horton Capital Management, LLC

5%+ holder13D · 4.2%

917.3K

% of company

3.68%

Change vs last qtr

—

Held since

—

9 more holders behind a free account

See every insider and 5%+ holder of One Stop Systems Inc.

Comments