One Stop Systems, Inc. (OSS) shareholders
OSSNasdaqElectronic ComputersFiscal year ends December 31
$4.51−0.21 (-4.45%)
Close on Nov 13, 2026Market cap $112.92MP/E 451.0Yield –
Ownership
Institutional holdings as of Jun 30, 2026, from 13F filings
Held by institutions
43.2%
11M of 25M shares
Institutional holders
108
51 new, 19 sold out
Net institutional buying
2M
In Q2 2026
Insider trades, 12 months
0 buys · 3 sales
Net sold $369.38K
Shares held by institutions
Holders of more than 5%
Latest Schedule 13D (active) or 13G (passive) filed by each holder
| Holder | Shares | % of class | Filing | As of |
|---|---|---|---|---|
| BlackRock, Inc. | 1,833,734 | 7.40% | 13G (passive) | Jun 30, 2026 |
| Galkin Vladimir Joint filing with Galkin Angelica (6.10%), Angelica Galkin Revocable Trust, dated April 21, 2018 (5.20%) | 1,500,000 | 6.10% | 13G (passive) amendment | Jul 31, 2026 |
| Jane Street Group, LLC | 1,388,714 | 5.60% | 13G (passive) | May 7, 2026 |
| Ramya Rao | 1,087,112 | 5.15% | 13G (passive) | Dec 31, 2024 |
| Barclays PLC | – | – | 13G (passive) amendment | Mar 31, 2025 |
Top institutional holders
13F holdings as of Jun 30, 2026
| Holder | Shares | % of OSS | Value | Change | % of portfolio |
|---|---|---|---|---|---|
| BlackRock, Inc. | 1,837,840 | 7.34% | $33.41M | +1,240,537 | 0.00% |
| Jane Street Group, LLC | 1,309,455 | 5.23% | $23.81M | +434,897 | 0.00% |
| Vanguard Capital Management LLC | 974,568 | 3.89% | $17.72M | +14,980 | 0.00% |
| Geode Capital Management, LLC | 572,918 | 2.29% | $10.42M | +320,465 | 0.00% |
| Bard Associates Inc | 526,370 | 2.10% | $9.57M | −14,296 | 2.12% |
| Palisades Investment Partners, LLC | 414,392 | 1.66% | $7.53M | New | 2.14% |
| Renaissance Technologies LLC | 407,860 | 1.63% | $7.41M | +147,900 | 0.01% |
| State Street Corp | 384,259 | 1.53% | $6.99M | +282,583 | 0.00% |
| Millennium Management LLC | 337,710 | 1.35% | $6.14M | −63,019 | 0.00% |
| Qube Research & Technologies Ltd | 318,919 | 1.27% | $5.80M | New | 0.01% |
| Cambridge Investment Research Advisors, Inc. | 298,584 | 1.19% | $5.43M | +152,960 | 0.01% |
| Northern Trust Corp | 178,101 | 0.71% | $3.24M | +131,127 | 0.00% |
| Two Sigma Investments, LP | 162,193 | 0.65% | $2.95M | New | 0.00% |
| Vanguard Fiduciary Trust Co | 157,365 | 0.63% | $2.86M | +28,606 | 0.00% |
| Vanguard Portfolio Management LLC | 155,408 | 0.62% | $2.83M | New | 0.00% |
| New York State Common Retirement Fund | 147,343 | 0.59% | $2.68M | New | 0.00% |
| Dimensional Fund Advisors LP | 146,871 | 0.59% | $2.67M | New | 0.00% |
| Squarepoint Ops LLC | 131,346 | 0.52% | $2.39M | +72,870 | 0.00% |
| EAM Investors, LLC | 130,568 | 0.52% | $2.37M | −5,421 | 0.21% |
| DnB Asset Management AS | 118,759 | 0.47% | $2.16M | −133,974 | 0.01% |
Institutional buying and selling by quarter
Positions opened, added to, reduced and closed by 13F filers
| Quarter | Holders | Shares held | % of shares | New / added | Reduced / closed | Shares bought | Shares sold |
|---|---|---|---|---|---|---|---|
| Q2 2026 | 108 | 11M | 43.2% | 51 / 27 | 24 / 19 | 5M | 3M |
| Q1 2026 | 77 | 8M | 33.3% | 27 / 22 | 22 / 18 | 4M | 4M |
| Q4 2025 | 69 | 9M | 37.1% | 22 / 25 | 17 / 10 | 3M | 3M |
| Q3 2025 | 59 | 10M | 38.8% | 26 / 17 | 12 / 6 | 4M | 1M |
| Q2 2025 | 39 | 6M | 25.7% | 10 / 13 | 11 / 4 | 1M | 0M |
| Q1 2025 | 33 | 5M | 21.3% | 4 / 16 | 7 / 8 | 0M | 0M |
| Q4 2024 | 37 | 5M | 21.1% | 12 / 11 | 8 / 2 | 0M | 0M |
| Q3 2024 | 27 | 5M | 20.2% | 2 / 7 | 9 / 8 | 0M | 1M |
| Q2 2024 | 34 | 5M | 21.9% | 10 / 13 | 6 / 1 | 0M | 0M |
| Q1 2024 | 25 | 5M | 21.7% | 4 / 9 | 7 / 8 | 0M | 0M |
| Q4 2023 | 29 | 6M | 22.5% | 5 / 7 | 8 / 2 | 0M | 0M |
| Q3 2023 | 26 | 6M | 22.3% | 6 / 7 | 7 / 6 | 0M | 0M |
Top mutual fund and ETF holders
Latest monthly portfolio reports (Form N-PORT)
59 funds held OSS in Q2 2026, 79% of their shares through ETFs. Each fund counts once per quarter, from its quarter-end report.
| Fund | Shares | % of OSS | Value | % of fund | As of |
|---|---|---|---|---|---|
| Vanguard Total Stock Market Index Fund | 693,556 | 2.77% | $12.61M | 0.00% | Jun 30, 2026 |
| iShares Russell 2000 ETF | 577,041 | 2.30% | $10.49M | 0.01% | Jun 30, 2026 |
| Vanguard Extended Market Index Fund | 257,191 | 1.03% | $4.68M | 0.00% | Jun 30, 2026 |
| Fidelity Small Cap Index Fund | 246,478 | 0.98% | $3.01M | 0.01% | Jul 31, 2026 |
| iShares Russell 2000 Growth ETF | 211,025 | 0.84% | $3.84M | 0.02% | Jun 30, 2026 |
| Fidelity Extended Market Index Fund | 113,847 | 0.45% | $2.07M | 0.00% | May 31, 2026 |
| iShares Micro-Cap ETF | 74,788 | 0.30% | $1.36M | 0.09% | Jun 30, 2026 |
| Schwab Small-Cap Index Fund | 55,360 | 0.22% | $677.05K | 0.01% | Jul 31, 2026 |
| Dimensional U.S. Small Cap ETF | 45,816 | 0.18% | $560.33K | 0.00% | Jul 31, 2026 |
| Master Small Cap Index Series | 42,003 | 0.17% | $763.61K | 0.01% | Jun 30, 2026 |
| Fidelity Total Market Index Fund | 40,247 | 0.16% | $731.69K | 0.00% | May 31, 2026 |
| U.S. Small Cap Portfolio | 36,302 | 0.14% | $443.97K | 0.00% | Jul 31, 2026 |
| Goldman Sachs Small Cap Equity Insights Fund | 35,029 | 0.14% | $428.40K | 0.04% | Jul 31, 2026 |
| Fidelity Series Total Market Index Fund | 33,246 | 0.13% | $604.41K | 0.00% | May 31, 2026 |
| Nuveen Small Cap Blend Index Fund | 29,810 | 0.12% | $364.58K | 0.01% | Jul 31, 2026 |
Officers, directors and major owners
People who filed Forms 3, 4 or 5 in the last two years
| Name | Role | Shares owned | % of shares | Latest filing |
|---|---|---|---|---|
| Michael Knowles | Chief Executive Officer, Director | 590,141 | 2.36% | Sep 4, 2026 |
| Daniel G. Gabel | Chief Financial Officer | 148,451 | 0.59% | Nov 13, 2026 |
| James Ison | CPO | 377,318 | 1.51% | Mar 2, 2026 |
| Gregory W. Matz | Director | 81,414 | 0.33% | May 26, 2026 |
| Michael J. Dumont | Director | 206,682 | 0.83% | May 26, 2026 |
| Mitchell H. Herbets | Director | 48,984 | 0.20% | May 26, 2026 |
| David George Bassett | Director | 24,984 | 0.10% | May 26, 2026 |
Insider trades
Common stock transactions reported on Form 4, newest first
| Insider | Date | Transaction | Shares | Price | Value | Shares after |
|---|---|---|---|---|---|---|
| Daniel G. Gabel Chief Financial Officer | Nov 11, 2026 | Tax withholding | −1,613 | $4.76 | $7.68K | 148,451 |
| Michael Knowles Chief Executive Officer, Director | Aug 15, 2026 | Tax withholding | −8,621 | $13.61 | $117.33K | 590,141 |
| Michael Knowles Chief Executive Officer, Director | Aug 7, 2026 | Tax withholding | −8,621 | $13.32 | $114.83K | 598,762 |
| Daniel G. Gabel Chief Financial Officer | Aug 7, 2026 | Tax withholding | −3,832 | $13.32 | $51.04K | 150,064 |
| Michael Knowles Chief Executive Officer, Director | Jun 5, 2026 | Tax withholding | −19,675 | $16.89 | $332.31K | 607,383 |
| Mitchell H. Herbets Director | May 26, 2026 | Sale | −5,000 | $17.62 | $88.10K | 48,984 |
| Gregory W. Matz Director | May 26, 2026 | Sale | −8,000 | $17.52 | $140.16K | 78,914 |
| David George Bassett Director | May 26, 2026 | Sale | −8,000 | $17.64 | $141.12K | 24,984 |
| Mitchell H. Herbets Director | May 20, 2026 | Award | +11,984 | – | – | 53,984 |
| Michael J. Dumont Director | May 20, 2026 | Award | +11,984 | – | – | 119,833 |
| Gregory W. Matz Director | May 20, 2026 | Award | +11,984 | – | – | 86,914 |
| David George Bassett Director | May 20, 2026 | Award | +11,984 | – | – | 32,984 |
| Daniel G. Gabel Chief Financial Officer | May 11, 2026 | Tax withholding | −1,613 | $15.68 | $25.29K | 153,896 |
| Michael Knowles Chief Executive Officer, Director | Feb 15, 2026 | Tax withholding | −6,650 | $8.70 | $57.85K | 648,058 |
| James Ison CPO | Feb 15, 2026 | Tax withholding | −3,120 | $8.70 | $27.14K | 146,170 |
| James Ison CPO | Feb 15, 2026 | Gift | +4,263 | – | – | 231,148 |
| James Ison CPO | Feb 15, 2026 | Gift | −4,263 | – | – | 141,907 |
| Daniel G. Gabel Chief Financial Officer | Feb 7, 2026 | Tax withholding | −7,799 | $9.24 | $72.06K | 155,509 |
| Michael Knowles Chief Executive Officer, Director | Feb 7, 2026 | Tax withholding | −13,298 | $9.24 | $122.87K | 654,708 |
| James Ison CPO | Feb 7, 2026 | Tax withholding | −6,546 | $9.24 | $60.49K | 149,290 |
| James Ison CPO | Feb 7, 2026 | Gift | −8,213 | – | – | 141,077 |
| James Ison CPO | Feb 7, 2026 | Gift | +8,213 | – | – | 226,885 |
| James Ison CPO | Feb 7, 2026 | Award | +34,313 | – | – | 155,836 |
| Daniel G. Gabel Chief Financial Officer | Feb 7, 2026 | Award | +55,239 | – | – | 163,308 |
| Michael Knowles Chief Executive Officer, Director | Feb 7, 2026 | Award | +101,862 | – | – | 668,006 |
| Daniel G. Gabel Chief Financial Officer | Dec 31, 2025 | Tax withholding | −3,215 | $7.18 | $23.08K | 108,069 |
| Michael Knowles Chief Executive Officer, Director | Dec 31, 2025 | Tax withholding | −19,075 | $7.18 | $136.96K | 566,144 |
| Michael Knowles Chief Executive Officer, Director | Aug 20, 2025 | Tax withholding | −8,359 | $5.26 | $43.97K | 585,219 |
| James Ison CPO | Aug 20, 2025 | Tax withholding | −3,113 | $5.26 | $16.37K | 125,794 |
| James Ison CPO | Aug 20, 2025 | Gift | −4,271 | – | – | 121,523 |
| James Ison CPO | Aug 20, 2025 | Gift | +4,271 | – | – | 218,672 |
| Michael Knowles Chief Executive Officer, Director | Jun 5, 2025 | Tax withholding | −19,075 | $3.06 | $58.37K | 593,578 |
| David George Bassett Director | May 21, 2025 | Award | +21,000 | – | – | 21,000 |
| Michael Knowles Chief Executive Officer, Director | May 21, 2025 | Award | +0 | – | – | 591,653 |
| Michael Knowles Chief Executive Officer, Director | May 21, 2025 | Award | +21,000 | – | – | 612,653 |
| Mitchell H. Herbets Director | May 21, 2025 | Award | +21,000 | – | – | 42,000 |
| Michael J. Dumont Director | May 21, 2025 | Tax withholding | +21,000 | – | – | 21,000 |
| Gregory W. Matz Director | May 21, 2025 | Award | +21,000 | – | – | 74,930 |
| Michael Knowles Chief Executive Officer, Director | Feb 20, 2025 | Tax withholding | −16,800 | $3.76 | $63.17K | 591,653 |
| James Ison CPO | Feb 20, 2025 | Gift | +7,760 | – | – | 214,401 |
| James Ison CPO | Feb 20, 2025 | Tax withholding | −7,006 | $3.76 | $26.34K | 136,667 |
| James Ison CPO | Feb 20, 2025 | Gift | −7,760 | – | – | 128,907 |
| Michael Knowles Chief Executive Officer, Director | Feb 7, 2025 | Award | +131,448 | $4.06 | $533.68K | 608,453 |
| Daniel G. Gabel Chief Financial Officer | Feb 7, 2025 | Award | +71,284 | $4.06 | $289.41K | 111,284 |
| James Ison CPO | Feb 7, 2025 | Award | +44,279 | $4.06 | $179.77K | 135,913 |
| Daniel G. Gabel Chief Financial Officer | Nov 11, 2024 | Award | +40,000 | – | – | 40,000 |
| James Ison CPO | Sep 23, 2024 | Gift | −8,227 | – | – | 91,634 |
| James Ison CPO | Sep 23, 2024 | Tax withholding | −4,440 | $2.19 | $9.72K | 99,861 |
| James Ison CPO | Sep 23, 2024 | Gift | +8,227 | – | – | 206,641 |
| John W. Morrison Jr. Chief Financial Officer | Sep 23, 2024 | Tax withholding | −5,961 | $2.19 | $13.05K | 305,381 |
| John W. Morrison Jr. Chief Financial Officer | Aug 20, 2024 | Tax withholding | −4,059 | $2.16 | $8.77K | 311,342 |
| James Ison CPO | Aug 20, 2024 | Tax withholding | −3,271 | $2.16 | $7.07K | 110,363 |
| James Ison CPO | Aug 20, 2024 | Gift | +6,062 | – | – | 198,414 |
| James Ison CPO | Aug 20, 2024 | Gift | −6,062 | – | – | 104,301 |
| Joseph M. Manko Jr. Director | Aug 14, 2024 | Buy | +25,000 | $1.99 | $49.75K | 1,174,899 |
| Joseph M. Manko Jr. Director | Aug 13, 2024 | Buy | +50,000 | $1.94 | $97.00K | 1,149,899 |
| Kenneth F. Potashner Director | Jul 9, 2024 | Option exercise | +40,000 | $0.46 | $18.40K | 398,601 |
| John W. Morrison Jr. Chief Financial Officer | Jul 1, 2024 | Award | +71,300 | – | – | 315,401 |
| Michael J. Dumont Director | Jul 1, 2024 | Award | +21,000 | – | – | 21,000 |
| Gioia Messinger Director | Jul 1, 2024 | Award | +21,000 | – | – | 49,690 |
Awards, option exercises, tax withholding and gifts are shown alongside open-market buys and sales. Each name links to the filing on SEC EDGAR.
Short interest
Shares sold short and not yet bought back, as of Oct 30, 2026 (FINRA, reported twice a month)
Short % of float
14.62%
3M shares short
Days to cover
2.1
At 2M shares a day
Change since last report
-9.8%
From 4M shares
Short volume, 20 days
53.3%
Of volume reported to FINRA
Shares sold short, last 12 months
Short sale volume counts trades marked short on any given day, including market-maker hedging, so it runs far higher than the share of One Stop Systems's stock actually held short. Settlement fails (shares not delivered on time) peaked at 15,910 shares on Sep 8, 2026 over the last 90 days.
Planned insider sales
Notices of proposed sale filed on Form 144 before shares are sold
| Seller | Filed | Shares | Market value | Planned sale | Acquired through |
|---|---|---|---|---|---|
| David George Bassett Director | May 26, 2026 | 8,000 | $142.88K | May 26, 2026 | Restricted Stock Units |
| Mitchell H. Herbets Director | May 26, 2026 | 5,000 | $88.13K | May 26, 2026 | Restricted stock vesting under a registered plan |
| Gregory W. Matz Director | May 26, 2026 | 8,000 | $137.76K | May 26, 2026 | Stock Award |
See a number that looks wrong?