Ranked by reported Q2 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 | BlackRock, Inc. | 1.8M | $33.4M | +207.7% | 7.420% | 0.00% |
| 2 | JANE STREET GROUP, LLC | 1.6M | $29.2M | +57.0% | 6.481% | 0.00% |
| 3 | CITADEL ADVISORS LLC | 1.2M | $21.3M | +57.5% | 4.736% | 0.00% |
| 4 | VANGUARD CAPITAL MANAGEMENT LLC | 975K | $17.7M | +1.6% | 3.935% | 0.00% |
| 5 | SUSQUEHANNA INTERNATIONAL GROUP, LLP | 801K | $14.6M | +22.3% | 3.234% | 0.00% |
| 6 | GEODE CAPITAL MANAGEMENT, LLC | 573K | $10.4M | +126.9% | 2.313% | 0.00% |
| 7 | BARD ASSOCIATES INC | 526K | $9.6M | -2.6% | 2.125% | 2.12% |
| 8 | Palisades Investment Partners, LLC | 414K | $7.5M | — | 1.673% | 2.14% |
| 9 | RENAISSANCE TECHNOLOGIES LLC | 408K | $7.4M | +56.9% | 1.647% | 0.01% |
| 10 | STATE STREET CORP | 384K | $7.0M | +277.9% | 1.551% | 0.00% |
| 11 | MILLENNIUM MANAGEMENT LLC | 338K | $6.1M | -15.7% | 1.363% | 0.00% |
| 12 | Qube Research & Technologies Ltd | 319K | $5.8M | — | 1.288% | 0.01% |
| 13 | PEAK6 LLC | 200K | $3.6M | — | 0.806% | 0.01% |
| 14 | NORTHERN TRUST CORP | 178K | $3.2M | +279.2% | 0.719% | 0.00% |
| 15 | TWO SIGMA INVESTMENTS, LP | 162K | $2.9M | — | 0.655% | 0.00% |
| 16 | VANGUARD FIDUCIARY TRUST CO | 157K | $2.9M | +22.2% | 0.635% | 0.00% |
| 17 | VANGUARD PORTFOLIO MANAGEMENT LLC | 155K | $2.8M | — | 0.627% | 0.00% |
| 18 | NEW YORK STATE COMMON RETIREMENT FUND | 147K | $2.7M | — | 0.595% | 0.00% |
| 19 | DIMENSIONAL FUND ADVISORS LP | 147K | $2.7M | — | 0.593% | 0.00% |
| 20 | Squarepoint Ops LLC | 131K | $2.4M | +124.6% | 0.530% | 0.00% |
| 21 | Informed Momentum Co LLC | 131K | $2.4M | -4.0% | 0.527% | 0.21% |
| 22 | DnB Asset Management AS | 119K | $2.2M | -53.0% | 0.479% | 0.01% |
| 23 | MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. | 99K | $1.8M | +34.4% | 0.401% | 0.00% |
| 24 | Trexquant Investment LP | 98K | $1.8M | -54.8% | 0.397% | 0.01% |
| 25 | MORGAN STANLEY | 89K | $1.6M | -79.4% | 0.359% | 0.00% |
denotes a marquee investor (Buffett, Burry, ARK, Tiger Global, Pershing Square, Baupost and other widely-followed managers). “% of Fund” shows how much of that investor’s total 13F portfolio is invested in OSS — a direct measure of their conviction.
Filings activity in OSS during Q2 2026, grouped by how each filer changed its position.
8 quarters of 13F filings · Δ columns show change vs prior quarter
| Quarter | Inst. Holders | Δ Holders | Ownership % | Δ Ownership | Total 13F Value | Δ Value |
|---|---|---|---|---|---|---|
| Q2 2026 | 111 | +42% | 53.11% | +15.27 pp | $234M | +247% |
| Q1 2026 | 78 | +13% | 37.84% | 1.77 pp | $67M | +1.9% |
| Q4 2025 | 69 | +17% | 39.61% | 5.75 pp | $66M | +29% |
| Q3 2025 | 59 | +55% | 45.36% | +14.95 pp | $51M | +122% |
| Q2 2025 | 38 | +23% | 30.41% | +5.77 pp | $23M | +90% |
| Q1 2025 | 31 | 14% | 24.64% | 0.12 pp | $12M | 29% |
| Q4 2024 | 36 | +38% | 24.76% | +0.73 pp | $17M | +44% |
| Q3 2024 | 26 | — | 24.03% | — | $12M | — |
Source: SEC 13F institutional filings. Ownership % requires market cap data and will show once linked. Δ columns compare to the immediately prior filed quarter.
Quick answers to the most common questions about buying OSS stock.
Based on Q2 2026 13F filings, institutional ownership of One Stop Systems, Inc. stands at 53.1%, held across 111 reporting institutions.
BlackRock, Inc. is the largest reported institutional holder of OSS, with approximately 1,837,840 shares worth $0.03B as of Q2 2026.
Yes — 6 widely-followed marquee investors appear among the top 25 institutional holders of OSS, including JANE STREET GROUP, LLC, CITADEL ADVISORS LLC, SUSQUEHANNA INTERNATIONAL GROUP, LLP, RENAISSANCE TECHNOLOGIES LLC, MILLENNIUM MANAGEMENT LLC.
Our composite Smart Money Score for OSS is 88 out of 100 (Strong Smart Money). It combines net institutional buying activity, ownership shift, marquee investor presence, and holder-count growth.
49 institutions opened new positions in OSS during Q2 2026, while 17 fully exited. 53 added to existing positions and 6 trimmed.
OSS institutional ownership rose by 15.27 percentage points quarter-over-quarter, with a net change of +33 holders.
The top 10 institutions account for 67.6% of all reported 13F value in OSS, and the top 25 account for 86.8%.
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