eFFECTOR Therapeutics, Inc. (EFTR) Ownership
EFTR ownership summary
as of October 21, 2026- Institutions
- 0.0% of shares outstanding
- Insiders
- 0.00% of shares outstanding
- Shares outstanding
- 4.7M
- Float
- 4.7M shares available to trade
- Short interest
- 14.74% 92K shares short
- Days to cover
- 0.54 short interest down 3.3% vs prior month
- Other investors 100.00%
EFTR top institutional holders
1 largest| # | Holder | % of shares | Shares | Value | Change | Reported |
|---|---|---|---|---|---|---|
| 1 | Proathlete Wealth Management Llc | <0.01% | 12 | $0 | — | June 30, 2026 |
Value at the latest close. Change = shares bought or sold in the latest quarterly filing (13F). In the top 1, 0 holders added 0 shares and 0 cut 0.
EFTR top mutual fund and ETF holders
1 largest| # | Holder | % of shares | Shares | Value | Change | Reported |
|---|---|---|---|---|---|---|
| 1 | SSgA U.S. Total Market Index Strategy | <0.01% | 69 | $0 | +20 (+40.8%) | June 30, 2024 |
Funds report holdings monthly or quarterly; dates differ by fund.
EFTR insider transactions
latest 1| Date | Name | Transaction | Price | Shares | Value |
|---|---|---|---|---|---|
| 2023-11-27 | Sr One Capital Management, Llc | Sell | $15.25 | 24,366 | $371,582 |
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.
EFTR shares outstanding
Year-end shares outstanding, adjusted for splits.
Who owns EFTR
Institutional investors own 0.0% of eFFECTOR Therapeutics's shares and insiders 0.00%. The largest holder is Proathlete Wealth Management Llc with <0.01% of the shares (12), as of June 30, 2026. Among the top 1 institutions, 0 added shares and 0 reduced their stake in the latest filings. Short interest is 14.74% of the float, or 0.54 days of average trading volume. The share count rose 346.0% since 2020.
Related: EFTR analyst forecast, EFTR key metrics. See the EFTR stock overview for the latest quote and news.
EFTR ownership FAQ
Who owns the most eFFECTOR Therapeutics stock?
The largest shareholders of eFFECTOR Therapeutics are Proathlete Wealth Management Llc (<0.01%).
What percentage of eFFECTOR Therapeutics is owned by institutions?
Institutions hold 0.0% of eFFECTOR Therapeutics's shares outstanding; insiders hold 0.00%.
Which funds own eFFECTOR Therapeutics?
The largest fund holders of eFFECTOR Therapeutics are SSgA U.S. Total Market Index Strategy (<0.01%).
What is eFFECTOR Therapeutics's short interest?
92K shares of eFFECTOR Therapeutics were sold short, 14.74% of the float; at the average daily volume it would take 0.54 days to cover.
Are insiders buying or selling eFFECTOR Therapeutics?
Of the latest 1 reported insider transactions in eFFECTOR Therapeutics (since November 27, 2023), 0 were purchases and 1 were sales.
How many shares of eFFECTOR Therapeutics are outstanding?
eFFECTOR Therapeutics has 4.7M shares outstanding, of which 4.7M are in the public float.