Ranked by reported Q1 2026 13F market value
Share of total reported institutional value in OSS held by the largest 10 / 25 filers.
| # | Institution | Shares Held | Market Value | QoQ Change | Ownership % | % of Fund |
|---|---|---|---|---|---|---|
| 1 | VANGUARD CAPITAL MANAGEMENT LLC | 960K | $7.3M | β | 3.874% | 0.00% |
| 2 | CITADEL ADVISORS LLC | 745K | $5.6M | +91.8% | 3.008% | 0.00% |
| 3 | SUSQUEHANNA INTERNATIONAL GROUP, LLP | 655K | $5.0M | +73.4% | 2.646% | 0.00% |
| 4 | BlackRock, Inc. | 597K | $4.5M | +334.6% | 2.412% | 0.00% |
| 5 | BARD ASSOCIATES INC | 541K | $4.1M | -36.5% | 2.183% | 1.03% |
| 6 | MORGAN STANLEY | 432K | $3.3M | +594.0% | 1.744% | 0.00% |
| 7 | MARSHALL WACE, LLP | 419K | $3.2M | +52.9% | 1.692% | 0.00% |
| 8 | UBS Group AG | 407K | $3.1M | +5704.5% | 1.643% | 0.00% |
| 9 | MILLENNIUM MANAGEMENT LLC | 401K | $3.0M | +865.4% | 1.618% | 0.00% |
| 10 | RENAISSANCE TECHNOLOGIES LLC | 260K | $2.0M | -30.8% | 1.050% | 0.00% |
| 11 | DnB Asset Management AS | 253K | $1.9M | +65.3% | 1.020% | 0.01% |
| 12 | GEODE CAPITAL MANAGEMENT, LLC | 252K | $1.9M | +5.9% | 1.019% | 0.00% |
| 13 | Trexquant Investment LP | 218K | $1.6M | -15.2% | 0.879% | 0.02% |
| 14 | SEI INVESTMENTS CO | 167K | $1.3M | +66.9% | 0.673% | 0.00% |
| 15 | EAM Investors, LLC | 136K | $1.0M | -16.6% | 0.549% | 0.12% |
| 16 | VANGUARD FIDUCIARY TRUST CO | 129K | $975K | β | 0.520% | 0.00% |
| 17 | STATE STREET CORP | 102K | $770K | +20.2% | 0.411% | 0.00% |
| 18 | GOLDMAN SACHS GROUP INC | 77K | $583K | -40.2% | 0.311% | 0.00% |
| 19 | CITIGROUP INC | 76K | $573K | +1571.9% | 0.306% | 0.00% |
| 20 | MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. | 74K | $559K | β | 0.298% | 0.00% |
| 21 | Eddie Patel Inc | 67K | $508K | β | 0.271% | 0.39% |
| 22 | OXFORD ASSET MANAGEMENT LLP | 64K | $488K | β | 0.260% | 0.21% |
| 23 | 683 Capital Management, LLC | 60K | $454K | -33.5% | 0.242% | 0.04% |
| 24 | Squarepoint Ops LLC | 58K | $443K | -60.5% | 0.236% | 0.00% |
| 25 | XTX Topco Ltd | 51K | $385K | -7.2% | 0.205% | 0.01% |
denotes a marquee investor (Buffett, Burry, ARK, Tiger Global, Pershing Square, Baupost and other widely-followed managers). β% of Fundβ shows how much of that investorβs total 13F portfolio is invested in OSS β a direct measure of their conviction.
Filings activity in OSS during Q1 2026, grouped by how each filer changed its position.
8 quarters of 13F filings Β· Ξ columns show change vs prior quarter
| Quarter | Inst. Holders | Ξ Holders | Ownership % | Ξ Ownership | Total 13F Value | Ξ Value |
|---|---|---|---|---|---|---|
| Q1 2026 | 75 | +10% | 14.40% | 1.57 pp | $59M | 9.8% |
| Q4 2025 | 68 | +17% | 15.97% | +3.57 pp | $66M | +29% |
| Q3 2025 | 58 | +53% | 12.40% | +6.79 pp | $51M | +121% |
| Q2 2025 | 38 | +23% | 5.61% | +2.66 pp | $23M | +90% |
| Q1 2025 | 31 | 14% | 2.95% | 1.24 pp | $12M | 29% |
| Q4 2024 | 36 | +38% | 4.19% | +1.27 pp | $17M | +44% |
| Q3 2024 | 26 | 19% | 2.92% | 0.19 pp | $12M | 6.3% |
| Q2 2024 | 32 | β | 3.11% | β | $13M | β |
Source: SEC 13F institutional filings. Ownership % requires market cap data and will show once linked. Ξ columns compare to the immediately prior filed quarter.
Quick answers to the most common questions about buying OSS stock.
Based on Q1 2026 13F filings, institutional ownership of One Stop Systems, Inc. stands at 14.4%, held across 75 reporting institutions.
VANGUARD CAPITAL MANAGEMENT LLC is the largest reported institutional holder of OSS, with approximately 959,588 shares worth $0.01B as of Q1 2026.
Yes β 4 widely-followed marquee investors appear among the top 25 institutional holders of OSS, including CITADEL ADVISORS LLC, SUSQUEHANNA INTERNATIONAL GROUP, LLP, MILLENNIUM MANAGEMENT LLC, RENAISSANCE TECHNOLOGIES LLC.
Our composite Smart Money Score for OSS is 53 out of 100 (Neutral). It combines net institutional buying activity, ownership shift, marquee investor presence, and holder-count growth.
26 institutions opened new positions in OSS during Q1 2026, while 19 fully exited. 29 added to existing positions and 20 trimmed.
OSS institutional ownership fell by 1.57 percentage points quarter-over-quarter, with a net change of +7 holders.
The top 10 institutions account for 69.0% of all reported 13F value in OSS, and the top 25 account for 91.8%.
All data is sourced from SEC Form 13F filings, which institutional investment managers with at least $100M in assets are required to file each quarter. We process every 13F filing from EDGAR and recompute the aggregates after each cycle. Insider transactions are sourced from Form 4 filings.
One Stop Systems, Inc. (OSS) Institutional Ownership