One Stop Systems, Inc. (OSS) Insider Trading
Over the last 3 months, OSS insiders made 0 open-market buys and 3 sales, a net sale of -$369K (SEC Form 4). Over the last 6 months, 49 institutions increased and 40 reduced their position (13F).
Insider Activity
Sentiment
0/100
Buys (3m)
0
Sells (3m)
3
Net (3m)
-$369.4K
Insider trades by month Buys Sells
Dec
Apr
Aug
Jan
Aug
May
Context3-month price +140.2%Institutions accumulating (13F)
| Date | Insider | Type | Shares | Price |
|---|---|---|---|---|
| Jun 12, 2026 | KNOWLES MICHAELdirector, officer: Chief Executive Officer | Tax | 19,675 | $16.89 |
| May 28, 2026 | Gabel Daniel G.officer: Chief Financial Officer | Tax | 1,613 | $15.68 |
| May 26, 2026 | Herbets Mitchell Hdirector | Grant | 11,984 | — |
| May 26, 2026 | BASSETT DAVID GEORGEdirector | Grant | 21,000 | — |
| May 26, 2026 | BASSETT DAVID GEORGEdirector | Grant | 11,984 | — |
| May 26, 2026 | BASSETT DAVID GEORGEdirector | Sell | 8,000 | $17.64 |
| May 26, 2026 | Matz Gregory Wdirector | Sell | 8,000 | $17.52 |
| May 26, 2026 | Herbets Mitchell Hdirector | Sell | 5,000 | $17.62 |
| May 26, 2026 | Matz Gregory Wdirector | Grant | 11,984 | — |
| May 26, 2026 | Dumont Michael J.director | Grant | 11,984 | — |
| Mar 27, 2026 | KNOWLES MICHAELdirector, officer: Chief Executive Officer | Grant | 0 | — |
| Mar 2, 2026 | Ison Jamesofficer: CPO | Tax | 6,546 | $9.24 |
| Mar 2, 2026 | Ison Jamesofficer: CPO | Grant | 34,313 | — |
| Mar 2, 2026 | KNOWLES MICHAELdirector, officer: Chief Executive Officer | Tax | 13,298 | $9.24 |
| Mar 2, 2026 | Ison Jamesofficer: CPO | Tax | 3,120 | $8.70 |
| Mar 2, 2026 | Gabel Daniel G.officer: Chief Financial Officer | Tax | 7,799 | $9.24 |
| Mar 2, 2026 | KNOWLES MICHAELdirector, officer: Chief Executive Officer | Tax | 6,650 | $8.70 |
| Feb 11, 2026 | KNOWLES MICHAELdirector, officer: Chief Executive Officer | Grant | 101,862 | — |
| Feb 11, 2026 | Gabel Daniel G.officer: Chief Financial Officer | Grant | 55,239 | — |
| Jan 12, 2026 | Gabel Daniel G.officer: Chief Financial Officer | Tax | 3,215 | $7.18 |
| Jan 7, 2026 | KNOWLES MICHAELdirector, officer: Chief Executive Officer | Tax | 19,075 | $7.18 |
| Sep 2, 2025 | KNOWLES MICHAELdirector, officer: Chief Executive Officer | Tax | 8,359 | $5.26 |
| Sep 2, 2025 | KNOWLES MICHAELdirector, officer: Chief Executive Officer | Tax | 16,800 | $3.76 |
| Sep 2, 2025 | KNOWLES MICHAELdirector, officer: Chief Executive Officer | Tax | 19,075 | $3.06 |
| Sep 2, 2025 | KNOWLES MICHAELdirector, officer: Chief Executive Officer | Grant | 131,448 | $4.06 |
| Sep 2, 2025 | KNOWLES MICHAELdirector, officer: Chief Executive Officer | Grant | 21,000 | — |
| Aug 25, 2025 | Ison Jamesofficer: CPO | Tax | 3,113 | $5.26 |
| May 28, 2025 | Herbets Mitchell Hdirector | Grant | 21,000 | — |
| May 27, 2025 | Dumont Michael J.director | Tax | 21,000 | — |
| May 23, 2025 | Matz Gregory Wdirector | Grant | 21,000 | — |
Source: OSS SEC Form 4 filings, latest Jun 12, 2026. For informational purposes only — not investment advice.
Institutional activity (13F)
How institutions changed their OSS positions over the last 6 months (SEC Form 13F).
Increased
49
New positions
50
Reduced
40
Sold out
28
Largest moves
| Institution | Action | Shares | Filed |
|---|---|---|---|
| VANGUARD CAPITAL MANAGEMENT LLC | New Position | 1.9M | May 15, 2026 |
| VANGUARD GROUP INC | Increased | 1.1M | Jan 29, 2026 |
| JANE STREET GROUP, LLC | Increased | 1.0M | May 12, 2026 |
| BARD ASSOCIATES INC | Reduced | 851K | Feb 13, 2026 |
| CITADEL ADVISORS LLC | Increased | 745K | May 15, 2026 |
| ARROWSTREET CAPITAL, LIMITED PARTNERSHIP | Increased | 693K | Feb 13, 2026 |
| LYNROCK LAKE LP | Reduced | 666K | Feb 17, 2026 |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | Increased | 655K | May 15, 2026 |
| JANE STREET GROUP, LLC | Increased | 604K | Feb 12, 2026 |
| BLACKROCK, INC. | Increased | 597K | May 13, 2026 |
| BARD ASSOCIATES INC | Reduced | 541K | May 8, 2026 |
| PACIFIC RIDGE CAPITAL PARTNERS, LLC | Reduced | 432K | Feb 4, 2026 |
| MORGAN STANLEY | Increased | 432K | May 15, 2026 |
| MARSHALL WACE, LLP | Increased | 419K | May 15, 2026 |
| UBS GROUP AG | Increased | 407K | May 5, 2026 |
Source: SEC Form 13F filings. For informational purposes only — not investment advice.