Protagonist Therapeutics (PTGX) Short Interest
NASDAQ: PTGXHealth CareBiotechnology: Pharmaceutical PreparationsUSD
At close: Oct 9, 4:00 PM ET · Delayed 15 min
Latest short interest · Sep 15, 2026
- Shares short
- 8.14M
- Change vs prior
- +5.5%
- Short % of shares out.
- 12.58%
- Days to cover
- 15.13
- Avg. daily volume
- 538.02K
- Prior report
- 7.71M
Protagonist Therapeutics short interest analysis
As of the Sep 15, 2026 settlement date, 8,140,194 PTGX shares were sold short, equal to 12.58% of Protagonist Therapeutics's shares outstanding. That is up 5.5% from the previous report of 7.71M shares. With average daily volume of 538.02K shares, it would take about 15.1 trading days for short sellers to buy back their positions, which is very high by typical standards.
The highest reading in the period shown was 8.63M shares on Mar 31, 2026.
Summary generated from market data by MetaCap's automated system. Methodology
PTGX short interest history
| Settlement | Short Interest | Change | % Shares Out. | Days to Cover |
|---|---|---|---|---|
| Sep 15, 2026 | 8,140,194 | +5.5% | 12.58% | 15.13 |
| Aug 31, 2026 | 7,712,543 | -1.0% | 11.92% | 15.34 |
| Aug 14, 2026 | 7,791,795 | +3.3% | 12.04% | 16.42 |
| Jul 31, 2026 | 7,543,109 | -9.0% | 11.66% | 14.21 |
| Jul 15, 2026 | 8,292,656 | +7.8% | 12.82% | 9.53 |
| Jun 30, 2026 | 7,691,347 | -0.5% | 11.89% | 7.22 |
| Jun 15, 2026 | 7,728,416 | +4.3% | 11.94% | 11.59 |
| May 29, 2026 | 7,410,849 | +1.6% | 11.45% | 16.81 |
| May 15, 2026 | 7,293,819 | -3.3% | 11.27% | 12.76 |
| Apr 30, 2026 | 7,540,996 | -10.2% | 11.65% | 11.88 |
| Apr 15, 2026 | 8,397,278 | -2.7% | 12.98% | 11.61 |
| Mar 31, 2026 | 8,626,880 | +7.0% | 13.33% | 7.64 |
Days to cover = shares short ÷ average daily volume. Short percent uses total shares outstanding as the denominator, which is slightly lower than a float-based figure.
Frequently asked questions
What is Protagonist Therapeutics's short interest?
PTGX short interest was 8,140,194 shares as of Sep 15, 2026, or 12.58% of shares outstanding, up 5.5% from the prior report.
What is PTGX's days to cover?
PTGX's days-to-cover (short interest ratio) is 15.13, meaning short sellers would need about 15.1 days of average trading volume to close their positions.
How often is short interest reported?
FINRA requires brokers to report short positions twice a month, as of mid-month and month-end settlement dates. The data is published about a week and a half after each settlement date, so it is always somewhat delayed.
Is high short interest bullish or bearish?
High short interest shows that many investors expect the price to fall, which is a bearish signal. It can also set up a short squeeze if the stock rises and short sellers rush to buy back shares. Neither outcome is guaranteed.