Ballard Power Systems Inc. (BLDP) Short Interest
BLDP Short Interest & Days to Cover
Ballard Power Systems Inc. (BLDP) currently has 16.6M shares short as of the Jul 31, 2026 settlement date, or about 2.2 days to cover at current trading volume. That is lower than 76% of the 21 readings on record since Apr 15, 2025, on a days-to-cover basis. Shares short have fallen for 1 straight reporting period. Looking at recent periods where short interest increased, the stock is now averaging -27.2% since those additions, recent short sellers are broadly profitable on that basis.
As of the Jul 31, 2026 settlement date, short interest is reported roughly every two weeks, not in real time.
Days to cover, compared against every biweekly reading on record for this stock specifically, not the market as a whole.
Short interest moving alone does not say much, what matters is whether it is moving with or against the price. Each period below compares the change in short interest to the stock's move over the same window.
| Settlement Date | SI Change | Read |
|---|---|---|
| Jul 31, 2026 | -35.7% | Covering into weakness |
| Jul 15, 2026 | +4.4% | Building into weakness |
| Jun 30, 2026 | +13.1% | Building into weakness |
| Jun 15, 2026 | +2.9% | Building into weakness |
| May 29, 2026 | -4.2% | Covering into strength |
| May 15, 2026 | +5.2% | New bearish bets despite strength |
| Apr 30, 2026 | +1.4% | — |
| Apr 15, 2026 | +0.8% | — |
Comparing the stock's price at each recent short-interest-increase to where it trades today. An estimate based on settlement-date prices, not any individual short seller's real entry.
| Build Date | Price Then | Return Since |
|---|---|---|
| Feb 13, 2026 | $2.15 | +4.7% |
| Mar 13, 2026 | $2.39 | -5.9% |
| May 15, 2026 | $4.45 | -49.4% |
| Jun 15, 2026 | $4.16 | -45.9% |
| Jun 30, 2026 | $3.89 | -42.2% |
| Jul 15, 2026 | $2.99 | -24.7% |
The 6 periods where short interest was in the top quarter of BLDP's own history on record (+6.16% or higher), and what followed.
| Forward Window | Avg Return | Win Rate |
|---|---|---|
| 3 months | +67.2% | 67% (n=6) |
| 6 months | — | — |
| 12 months | — | — |
A historical pattern in BLDP's own data, not a prediction.
Every biweekly settlement reading on record, most recent first. Page 1 of 1.
| Settlement Date | Shares Short | Days to Cover | Avg Daily Volume | Change |
|---|---|---|---|---|
| Jul 31, 2026 | 16.6M | 2.2 | 7.7M | -35.7% |
| Jul 15, 2026 | 25.8M | 2.9 | 8.8M | +4.4% |
| Jun 30, 2026 | 24.7M | 3.0 | 8.4M | +13.1% |
| Jun 15, 2026 | 21.8M | 2.8 | 7.7M | +2.9% |
| May 29, 2026 | 21.2M | 3.1 | 6.9M | -4.2% |
| May 15, 2026 | 22.1M | 4.2 | 5.3M | +5.2% |
| Apr 30, 2026 | 21.0M | 6.2 | 3.4M | +1.4% |
| Apr 15, 2026 | 20.7M | 6.5 | 3.2M | +0.8% |
| Mar 31, 2026 | 20.6M | 6.3 | 3.3M | -15.7% |
| Mar 13, 2026 | 24.4M | 7.8 | 3.1M | +2.9% |
| Feb 27, 2026 | 23.7M | 7.8 | 3.0M | -3.3% |
| Feb 13, 2026 | 24.5M | 6.4 | 3.8M | +3.2% |
| Jan 30, 2026 | 23.7M | 5.3 | 4.5M | +11.2% |
| Jan 15, 2026 | 21.3M | 4.2 | 5.1M | +1.9% |
| Dec 31, 2025 | 20.9M | 3.2 | 6.5M | -4.6% |
| Dec 15, 2025 | 22.0M | 2.9 | 7.6M | +6.1% |
| Nov 28, 2025 | 20.7M | 2.7 | 7.7M | +47.2% |
| Nov 14, 2025 | 14.1M | 2.0 | 7.1M | +1.9% |
| Oct 31, 2025 | 13.8M | 2.1 | 6.6M | -2.3% |
| Oct 15, 2025 | 14.1M | 2.1 | 6.7M | -24.3% |
| Apr 15, 2025 | 18.7M | 1.9 | 9.8M | — |
What is BLDP's current short interest?
Ballard Power Systems Inc. has 16.6M shares sold short as of Jul 31, 2026. Days to cover is 2.2.
Is BLDP's short interest high or low right now?
On a days-to-cover basis, current short interest is lower than 76% of the 21 biweekly readings on record, spanning Apr 15, 2025 to Jul 31, 2026. The historical average days to cover is 4.1, and the highest on record is 7.8 days, on Feb 27, 2026.
Is short interest in BLDP rising or falling?
Shares short have fallen for 1 consecutive reporting period.
Are short sellers in BLDP currently winning or losing?
Looking at the 6 most recent periods where short interest increased, the stock has averaged -27.2% since those additions, with price now below the entry level in 83% of those cases. This is an estimate based on the price at each settlement date, not a precise tracking of any individual short seller's actual entry.
What has historically happened after BLDP's short interest was this high?
In the 6 periods where days to cover was in the top quarter of this ticker's own history (6.2 days or higher), the stock has too few forward-looking data points on record to summarize reliably. This is a historical pattern, not a prediction.