Phio Pharmaceuticals Corp. (PHIO) Ownership
PHIO ownership summary
as of October 17, 2026- Institutions
- 10.2% of shares outstanding
- Insiders
- 8.01% of shares outstanding
- Shares outstanding
- 11.6M
- Float
- 11.3M shares available to trade
- Short interest
- 0.77% 89K shares short
- Days to cover
- 0.64 short interest down 40.3% vs prior month
- Institutions 10.21%
- Insiders 8.01%
- Other investors 81.78%
PHIO top institutional holders
20 largest| # | Holder | % of shares | Shares | Value | Change | Reported |
|---|---|---|---|---|---|---|
| 1 | Jane Street Group LLC | 1.01% | 118K | $102,565 | −1,434 (−1.2%) | June 30, 2026 |
| 2 | Geode Capital Management, LLC | 0.99% | 115K | $99,794 | −32,680 (−22.2%) | June 30, 2026 |
| 3 | Vanguard Capital Management, LLC | 0.81% | 94K | $82,102 | +14,409 (+18.0%) | June 30, 2026 |
| 4 | Delaware Management Holdings Inc | 0.43% | 50K | $43,550 | +50,000 (0.0%) | June 30, 2026 |
| 5 | Cetera Investment Advisers | 0.41% | 48K | $41,372 | +2,500 (+5.6%) | June 30, 2026 |
| 6 | Citadel Advisors Llc | 0.41% | 47K | $41,068 | +47,150 (0.0%) | June 30, 2026 |
| 7 | Vanguard Fiduciary Trust Co | 0.33% | 38K | $33,245 | — | June 30, 2026 |
| 8 | Northern Trust Corp | 0.24% | 28K | $24,186 | +4,010 (+16.9%) | June 30, 2026 |
| 9 | Two Sigma Investments LLC | 0.19% | 22K | $18,727 | −10,994 (−33.8%) | June 30, 2026 |
| 10 | XTX Topco Ltd | 0.16% | 18K | $16,092 | −6,393 (−25.7%) | June 30, 2026 |
| 11 | HRT FINANCIAL LLC | 0.11% | 13K | $11,482 | −21,550 (−62.0%) | June 30, 2026 |
| 12 | Bridgeway Capital Management, LLC | 0.10% | 12K | $10,452 | +12,000 (0.0%) | June 30, 2026 |
| 13 | Citigroup Inc | 0.10% | 12K | $10,108 | +10,580 (+1,032.2%) | June 30, 2026 |
| 14 | CapTrust Financial Advisors | 0.09% | 10K | $8,710 | — | June 30, 2026 |
| 15 | Tower Research Capital LLC | 0.05% | 6,206 | $5,405 | −1,414 (−18.6%) | June 30, 2026 |
| 16 | Morgan Stanley - Brokerage Accounts | 0.05% | 6,000 | $5,226 | — | June 30, 2026 |
| 17 | UBS Group AG | 0.05% | 5,387 | $4,692 | −21,600 (−80.0%) | June 30, 2026 |
| 18 | Advisor Group Holdings, Inc. | 0.02% | 2,000 | $1,742 | — | June 30, 2026 |
| 19 | Spire Wealth Management | 0.02% | 1,990 | $1,733 | −10 (−0.5%) | June 30, 2026 |
| 20 | SBI Securities Co Ltd | 0.01% | 1,247 | $1,086 | +23 (+1.9%) | June 30, 2026 |
Value at the latest close. Change = shares bought or sold in the latest quarterly filing (13F). In the top 20, 8 holders added 141K shares and 8 cut 96K.
PHIO top mutual fund and ETF holders
5 largest| # | Holder | % of shares | Shares | Value | Change | Reported |
|---|---|---|---|---|---|---|
| 1 | Fidelity Extended Market Index | 0.91% | 106K | $92,163 | +44,456 (+72.5%) | August 31, 2026 |
| 2 | Nomura Healthcare Fund Class I | 0.43% | 50K | $43,550 | — | August 31, 2026 |
| 3 | Fidelity Series Total Market Index | 0.13% | 15K | $12,772 | — | August 31, 2026 |
| 4 | Fidelity Total Market Index | 0.11% | 13K | $11,571 | — | August 31, 2026 |
| 5 | Bridgeway Ultra-Small Company | 0.10% | 12K | $10,452 | +12,000 (0.0%) | June 30, 2026 |
Funds report holdings monthly or quarterly; dates differ by fund.
PHIO insider transactions
latest 8| Date | Name | Transaction | Price | Shares | Value |
|---|---|---|---|---|---|
| 2025-12-23 | Robert J Bitterman | Buy | $1.02 | 5,000 | $5,100 |
| 2025-11-21 | Robert J Bitterman | Buy | $1.14 | 5,000 | $5,700 |
| 2025-11-18 | Robert J Bitterman | Buy | $1.27 | 5,000 | $6,350 |
| 2025-06-10 | Robert J Bitterman | Buy | $2.42 | 2,000 | $4,840 |
| 2025-06-10 | Robert L Ferrara | Buy | $2.42 | 2,500 | $6,050 |
| 2025-06-09 | Robert J Bitterman | Buy | $2.75 | 1,500 | $4,125 |
| 2025-05-22 | Robert J Bitterman | Buy | $1.78 | 1,200 | $2,136 |
| 2025-05-21 | Robert J Bitterman | Buy | $1.77 | 3,000 | $5,310 |
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.
PHIO shares outstanding
Year-end shares outstanding, adjusted for splits.
Who owns PHIO
Institutional investors own 10.2% of Phio Pharmaceuticals's shares and insiders 8.01%. The largest holder is Jane Street Group LLC with 1.01% of the shares (118K), as of June 30, 2026. Among the top 20 institutions, 8 added shares and 8 reduced their stake in the latest filings. Short interest is 0.77% of the float, or 0.64 days of average trading volume. The share count rose 11,617,200.0% since 2015.
Related: PHIO analyst forecast, PHIO key metrics. See the PHIO stock overview for the latest quote and news.
PHIO ownership FAQ
Who owns the most Phio Pharmaceuticals stock?
The largest shareholders of Phio Pharmaceuticals are Jane Street Group LLC (1.01%), Geode Capital Management, LLC (0.99%), Vanguard Capital Management, LLC (0.81%), Delaware Management Holdings Inc (0.43%), Cetera Investment Advisers (0.41%).
What percentage of Phio Pharmaceuticals is owned by institutions?
Institutions hold 10.2% of Phio Pharmaceuticals's shares outstanding; insiders hold 8.01%.
Which funds own Phio Pharmaceuticals?
The largest fund holders of Phio Pharmaceuticals are Fidelity Extended Market Index (0.91%), Nomura Healthcare Fund Class I (0.43%), Fidelity Series Total Market Index (0.13%), Fidelity Total Market Index (0.11%), Bridgeway Ultra-Small Company (0.10%).
What is Phio Pharmaceuticals's short interest?
89K shares of Phio Pharmaceuticals were sold short, 0.77% of the float; at the average daily volume it would take 0.64 days to cover.
Are insiders buying or selling Phio Pharmaceuticals?
Of the latest 8 reported insider transactions in Phio Pharmaceuticals (since May 21, 2025), 8 were purchases and 0 were sales.
How many shares of Phio Pharmaceuticals are outstanding?
Phio Pharmaceuticals has 11.6M shares outstanding, of which 11.3M are in the public float.