ClearSign Technologies Corporation (CLIR) Ownership
CLIR ownership summary
as of October 18, 2026- Institutions
- 26.0% of shares outstanding
- Insiders
- 4.67% of shares outstanding
- Shares outstanding
- 6.8M
- Float
- 5.4M shares available to trade
- Short interest
- 0.23% 13K shares short
- Days to cover
- 0.62 short interest down 20.9% vs prior month
- Institutions 26.04%
- Insiders 4.67%
- Other investors 69.28%
CLIR top institutional holders
20 largest| # | Holder | % of shares | Shares | Value | Change | Reported |
|---|---|---|---|---|---|---|
| 1 | Vanguard Capital Management, LLC | 1.55% | 105K | $253,030 | — | June 30, 2026 |
| 2 | CAMBRIDGE Invest RESEARCH ADVISORS, INC. | 1.30% | 89K | $212,640 | +44,300 (+100.0%) | June 30, 2026 |
| 3 | Massey, Quick & Co. LLC | 0.89% | 60K | $144,754 | — | June 30, 2026 |
| 4 | Geode Capital Management, LLC | 0.76% | 51K | $123,497 | −6,226 (−10.8%) | June 30, 2026 |
| 5 | Beacon Pointe Advisors, LLC | 0.40% | 27K | $65,215 | — | June 30, 2026 |
| 6 | Vanguard Fiduciary Trust Co | 0.34% | 23K | $56,304 | — | June 30, 2026 |
| 7 | HighTower Advisors, LLC | 0.33% | 23K | $54,389 | +9,982 (+78.7%) | June 30, 2026 |
| 8 | Citadel Advisors Llc | 0.30% | 21K | $49,356 | +20,565 (0.0%) | June 30, 2026 |
| 9 | BlackRock Inc | 0.29% | 20K | $46,807 | — | June 30, 2026 |
| 10 | DDD Partners, LLC | 0.18% | 12K | $28,800 | — | June 30, 2026 |
| 11 | Northern Trust Corp | 0.15% | 10K | $24,192 | +10,080 (0.0%) | June 30, 2026 |
| 12 | Rockefeller Capital Management L.P. | 0.12% | 8,120 | $19,488 | — | June 30, 2026 |
| 13 | Northwestern Mutual Wealth Management Co | 0.11% | 7,172 | $17,213 | — | June 30, 2026 |
| 14 | Wells Fargo & Co | 0.03% | 2,125 | $5,100 | — | June 30, 2026 |
| 15 | Gleason Group, Inc. | 0.03% | 1,802 | $4,325 | — | June 30, 2026 |
| 16 | Centerpoint Advisors, LLC | 0.02% | 1,560 | $3,744 | — | June 30, 2026 |
| 17 | Tower Research Capital LLC | 0.02% | 1,518 | $3,643 | +473 (+45.3%) | June 30, 2026 |
| 18 | Vanguard Global Advisers, LLC | 0.02% | 1,350 | $3,240 | — | June 30, 2026 |
| 19 | Integrated Wealth Concepts LLC | 0.01% | 687 | $1,649 | +687 (0.0%) | June 30, 2026 |
| 20 | Royal Bank of Canada | 0.01% | 684 | $1,642 | +684 (0.0%) | June 30, 2026 |
Value at the latest close. Change = shares bought or sold in the latest quarterly filing (13F). In the top 20, 7 holders added 87K shares and 1 cut 6,226.
CLIR top mutual fund and ETF holders
11 largest| # | Holder | % of shares | Shares | Value | Change | Reported |
|---|---|---|---|---|---|---|
| 1 | Vanguard MStar Total Stk Mkt Idx Invest | 0.87% | 59K | $141,662 | — | August 31, 2026 |
| 2 | Fidelity Extended Market Index | 0.34% | 23K | $55,726 | −125 (−0.5%) | August 31, 2026 |
| 3 | Fidelity Total Market Index | 0.15% | 10K | $24,583 | — | August 31, 2026 |
| 4 | Fidelity Series Total Market Index | 0.10% | 7,139 | $17,134 | — | August 31, 2026 |
| 5 | DFA US Vector Equity Class F | 0.03% | 2,304 | $5,530 | — | July 31, 2026 |
| 6 | Dimensional US Sustainability Core 1 ETF | 0.02% | 1,472 | $3,533 | — | September 30, 2026 |
| 7 | Vanguard U.S. Eq Idx £ Acc | 0.02% | 1,350 | $3,240 | — | August 31, 2026 |
| 8 | Dimensional US Core Equity 2 ETF | 0.02% | 1,055 | $2,532 | — | September 30, 2026 |
| 9 | Fidelity Nasdaq Composite Index | 0.01% | 1,011 | $2,426 | — | August 31, 2026 |
| 10 | Dimensional US Core Equity 1 ETF | 0.01% | 547 | $1,313 | — | September 24, 2026 |
| 11 | DFA US Vector Equity I | <0.01% | 139 | $334 | — | August 31, 2026 |
Funds report holdings monthly or quarterly; dates differ by fund.
CLIR insider transactions
latest 1| Date | Name | Transaction | Price | Shares | Value |
|---|---|---|---|---|---|
| 2026-03-16 | Gil Todd Silva | Buy | $4.36 | 2,000 | $8,720 |
Reported trades by company officers, directors and other filers (including disclosures by members of Congress where EODHD lists them). "—" where the filing gives no share count.
CLIR shares outstanding
Year-end shares outstanding, adjusted for splits.
Who owns CLIR
Institutional investors own 26.0% of ClearSign Technologies's shares and insiders 4.67%. The largest holder is Vanguard Capital Management, LLC with 1.55% of the shares (105K), as of June 30, 2026. Among the top 20 institutions, 7 added shares and 1 reduced their stake in the latest filings. Short interest is 0.23% of the float, or 0.62 days of average trading volume. The share count rose 388.5% since 2014.
Related: CLIR analyst forecast, CLIR key metrics. See the CLIR stock overview for the latest quote and news.
CLIR ownership FAQ
Who owns the most ClearSign Technologies stock?
The largest shareholders of ClearSign Technologies are Vanguard Capital Management, LLC (1.55%), CAMBRIDGE Invest RESEARCH ADVISORS, INC. (1.30%), Massey, Quick & Co. LLC (0.89%), Geode Capital Management, LLC (0.76%), Beacon Pointe Advisors, LLC (0.40%).
What percentage of ClearSign Technologies is owned by institutions?
Institutions hold 26.0% of ClearSign Technologies's shares outstanding; insiders hold 4.67%.
Which funds own ClearSign Technologies?
The largest fund holders of ClearSign Technologies are Vanguard MStar Total Stk Mkt Idx Invest (0.87%), Fidelity Extended Market Index (0.34%), Fidelity Total Market Index (0.15%), Fidelity Series Total Market Index (0.10%), DFA US Vector Equity Class F (0.03%).
What is ClearSign Technologies's short interest?
13K shares of ClearSign Technologies were sold short, 0.23% of the float; at the average daily volume it would take 0.62 days to cover.
Are insiders buying or selling ClearSign Technologies?
Of the latest 1 reported insider transactions in ClearSign Technologies (since March 16, 2026), 1 were purchases and 0 were sales.
How many shares of ClearSign Technologies are outstanding?
ClearSign Technologies has 6.8M shares outstanding, of which 5.4M are in the public float.