Ocean Power Technologies, Inc. (OPTT) Ownership
OPTT ownership summary
as of October 18, 2026- Institutions
- 12.3% of shares outstanding
- Insiders
- 4.07% of shares outstanding
- Shares outstanding
- 9.0M
- Float
- 8.9M shares available to trade
- Short interest
- 20.16% 4.0M shares short
- Days to cover
- 3.94 short interest up 8.8% vs prior month
- Institutions 12.27%
- Insiders 4.07%
- Other investors 83.66%
OPTT top institutional holders
20 largest| # | Holder | % of shares | Shares | Value | Change | Reported |
|---|---|---|---|---|---|---|
| 1 | Vanguard Capital Management, LLC | 99.05% | 8.9M | $5.4M | +340,643 (+4.0%) | June 30, 2026 |
| 2 | UBS Group AG | 76.29% | 6.9M | $4.2M | +2.9M (+72.5%) | June 30, 2026 |
| 3 | BlackRock Inc | 36.97% | 3.3M | $2.0M | −1 (0.0%) | June 30, 2026 |
| 4 | Polar Asset Management Partners | 33.80% | 3.0M | $1.9M | +3.0M (0.0%) | June 30, 2026 |
| 5 | Geode Capital Management, LLC | 24.41% | 2.2M | $1.3M | +43,075 (+2.0%) | June 30, 2026 |
| 6 | CAMBRIDGE Invest RESEARCH ADVISORS, INC. | 15.48% | 1.4M | $851,041 | +1.1M (+369.4%) | June 30, 2026 |
| 7 | Vanguard Fiduciary Trust Co | 15.41% | 1.4M | $847,007 | +353,192 (+34.2%) | June 30, 2026 |
| 8 | State Street Corp | 10.91% | 983K | $599,929 | +172,400 (+21.3%) | June 30, 2026 |
| 9 | Northern Trust Corp | 5.77% | 519K | $316,942 | +169,793 (+48.6%) | June 30, 2026 |
| 10 | Royal Bank of Canada | 5.75% | 518K | $316,270 | −187,500 (−26.6%) | June 30, 2026 |
| 11 | HAMILTON CAPITAL PARTNERS, LLC | 5.55% | 500K | $305,369 | +500,195 (0.0%) | June 30, 2026 |
| 12 | HighTower Advisors, LLC | 3.89% | 350K | $213,736 | +350,100 (0.0%) | June 30, 2026 |
| 13 | Susquehanna International Group, LLP | 2.85% | 257K | $156,695 | −104,748 (−29.0%) | June 30, 2026 |
| 14 | Essex Investment Management Company, LLC | 2.28% | 205K | $125,069 | −329 (−0.2%) | June 30, 2026 |
| 15 | D'Orazio & Associates Inc | 2.19% | 198K | $120,576 | −207,174 (−51.2%) | June 30, 2026 |
| 16 | Resources Investment Advisors Inc | 1.77% | 160K | $97,394 | −22,737 (−12.5%) | June 30, 2026 |
| 17 | Pinnacle Financial Partners Inc | 1.45% | 130K | $79,670 | +30,000 (+29.9%) | June 30, 2026 |
| 18 | SIMPLEX TRADING, LLC | 1.44% | 130K | $79,234 | −22,529 (−14.8%) | June 30, 2026 |
| 19 | DIVERSIFY WEALTH MANAGEMENT, LLC | 1.33% | 120K | $73,257 | +60,420 (+101.4%) | June 30, 2026 |
| 20 | IMC-Chicago, LLC | 1.15% | 103K | $63,029 | +68,900 (+200.6%) | June 30, 2026 |
Value at the latest close. Change = shares bought or sold in the latest quarterly filing (13F). In the top 20, 13 holders added 9.1M shares and 7 cut 545K.
OPTT top mutual fund and ETF holders
8 largest| # | Holder | % of shares | Shares | Value | Change | Reported |
|---|---|---|---|---|---|---|
| 1 | Abante Quant Value FI | 15.52% | 1.4M | $853,198 | +124,439 (+9.8%) | August 31, 2026 |
| 2 | Fidelity Extended Market Index | 13.06% | 1.2M | $717,696 | −6,318 (−0.5%) | August 31, 2026 |
| 3 | Fidelity Total Market Index | 3.58% | 323K | $197,064 | — | August 31, 2026 |
| 4 | Fidelity Series Total Market Index | 3.13% | 282K | $171,967 | — | August 31, 2026 |
| 5 | Vanguard Balanced Index Inv | 1.45% | 131K | $79,769 | — | August 31, 2026 |
| 6 | Vanguard MStar Inst Ttl StkMktIdxInstlPl | 0.95% | 85K | $52,134 | — | August 31, 2026 |
| 7 | Vanguard U.S. Eq Idx £ Acc | 0.41% | 37K | $22,324 | — | August 31, 2026 |
| 8 | MI Brompton UK Recovery Trust Acc | 0.00% | 4 | $2 | — | June 30, 2026 |
Funds report holdings monthly or quarterly; dates differ by fund.
OPTT insider transactions
latest 1| Date | Name | Transaction | Price | Shares | Value |
|---|---|---|---|---|---|
| 2025-09-17 | Philipp Stratmann | Buy | $0.49 | 3,989 | $1,955 |
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.
OPTT shares outstanding
Year-end shares outstanding, adjusted for splits.
Who owns OPTT
Institutional investors own 12.3% of Ocean Power Technologies's shares and insiders 4.07%. The largest holder is Vanguard Capital Management, LLC with 99.05% of the shares (8.9M), as of June 30, 2026. Among the top 20 institutions, 13 added shares and 7 reduced their stake in the latest filings. Short interest is 20.16% of the float, or 3.94 days of average trading volume. The share count rose 2,109,775.9% since 2014.
Related: OPTT analyst forecast, OPTT key metrics. See the OPTT stock overview for the latest quote and news.
OPTT ownership FAQ
Who owns the most Ocean Power Technologies stock?
The largest shareholders of Ocean Power Technologies are Vanguard Capital Management, LLC (99.05%), UBS Group AG (76.29%), BlackRock Inc (36.97%), Polar Asset Management Partners (33.80%), Geode Capital Management, LLC (24.41%).
What percentage of Ocean Power Technologies is owned by institutions?
Institutions hold 12.3% of Ocean Power Technologies's shares outstanding; insiders hold 4.07%.
Which funds own Ocean Power Technologies?
The largest fund holders of Ocean Power Technologies are Abante Quant Value FI (15.52%), Fidelity Extended Market Index (13.06%), Fidelity Total Market Index (3.58%), Fidelity Series Total Market Index (3.13%), Vanguard Balanced Index Inv (1.45%).
What is Ocean Power Technologies's short interest?
4.0M shares of Ocean Power Technologies were sold short, 20.16% of the float; at the average daily volume it would take 3.94 days to cover.
Are insiders buying or selling Ocean Power Technologies?
Of the latest 1 reported insider transactions in Ocean Power Technologies (since September 17, 2025), 1 were purchases and 0 were sales.
How many shares of Ocean Power Technologies are outstanding?
Ocean Power Technologies has 9.0M shares outstanding, of which 8.9M are in the public float.