TSS, Inc.
Ownership
Ownership Structure
Who owns TSS, Inc. (TSSI)? This page shows the largest institutions and funds, the ownership structure and the latest insider transactions. 76.5% of the shares are freely tradable; institutional investors hold 46.6%.
Largest Shareholders
Institutions
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| BlackRock Inc | 6.28 | 1,770,890 | +16.1 | 03/31/2026 |
| Vanguard Capital Management, LLC | 3.43 | 968,440 | +0.0 | 03/31/2026 |
| Jane Street Group LLC | 2.33 | 658,081 | +173.0 | 03/31/2026 |
| Geode Capital Management, LLC | 2.04 | 575,609 | +6.7 | 03/31/2026 |
| D. E. Shaw & Co LP | 1.92 | 542,913 | +192.0 | 06/30/2026 |
| UBS Group AG | 1.85 | 521,598 | +64.8 | 03/31/2026 |
| Value Aligned Research Advisors LLC | 1.63 | 460,510 | +0.0 | 03/31/2026 |
| State Street Corp | 1.51 | 425,254 | +16.5 | 03/31/2026 |
Funds
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| Vanguard MStar Total Stk Mkt Idx Invest | 2.41 | 679,327 | +0.0 | 07/31/2026 |
| iShares Russell 2000 ETF | 2.35 | 661,996 | -0.6 | 08/31/2026 |
Largest reported positions according to regulatory filings; stake as a percentage of shares outstanding, change versus the previous filing. Source: fundamentals data.
Insiders
Insider Transactions
| Date | Person | Role | Type | Shares | Price | Value |
|---|---|---|---|---|---|---|
| Apr 22, 2026 | Darryll E Dewan | CEO | Sell | 50,000 | 16.00 | 800,000 |
Reportable transactions by officers and major shareholders from SEC Form 4 filings. "Other" includes things like stock grants and option exercises without a buy/sell character. View all insider transactions →
Data as of: September 17, 2026 · Source: fundamental data & SEC filings (annual and quarterly reports, 10-K/10-Q)
Note: pure fact-based analysis, not investment advice and not a solicitation to buy or sell. All figures without guarantee.