PFE Dark Pool Activity
PFIZER INC
Data as of Oct 26, 2026 · Source: FINRA daily short sale volume (off-exchange)
On Oct 26, 2026, FINRA reported 12.8M PFE shares in publicly disseminated off-exchange trades (dark pools and other off-exchange venues). 7.8M of those shares (61.2%) were marked short or short-exempt, above PFE's 30-day rolling average of 44.2% (z-score 2.41). Over the last 10 FINRA sessions (Oct 13, 2026 – Oct 26, 2026), PFE's off-exchange short volume ratio ranged from 35.9% to 61.2% and averaged 44.4%; the latest reading is above that 10-session average.
Off-Exchange Volume
12.8M
Short Volume
7.8M
Short Volume Ratio
61.2%
30-Day Average
44.2%
z-score 2.41
Flagged as an anomaly
Meridian's dark pool model flags PFE's reading on Oct 26, 2026 as an anomaly (z-score 2.41 versus its 30-day rolling average).
Daily readings — last 10 FINRA sessions
| Date | Off-exchange shares | Short shares | Short ratio |
|---|---|---|---|
| Oct 13, 2026 | 10.0M | 5.6M | 56.0% |
| Oct 14, 2026 | 17.2M | 7.5M | 43.8% |
| Oct 15, 2026 | 13.0M | 5.6M | 42.8% |
| Oct 16, 2026 | 9.3M | 3.4M | 36.8% |
| Oct 19, 2026 | 8.5M | 3.7M | 43.7% |
| Oct 20, 2026 | 13.9M | 5.1M | 36.4% |
| Oct 21, 2026 | 9.1M | 4.0M | 44.2% |
| Oct 22, 2026 | 11.3M | 4.1M | 35.9% |
| Oct 23, 2026 | 11.7M | 5.1M | 43.6% |
| Oct 26, 2026 Latest | 12.8M | 7.8M | 61.2% |
Source: FINRA daily short sale volume (off-exchange). Ratio = ShortVolume ÷ TotalVolume for the day.
PFE dark pool FAQ
- How much PFE off-exchange volume did FINRA report on Oct 26, 2026?
- FINRA's daily short sale volume file reported 12.8M PFE shares in publicly disseminated off-exchange trades on Oct 26, 2026; 7.8M of those shares (61.2%) were marked short or short-exempt.
- Is PFE's dark pool short volume ratio unusual right now?
- As of Oct 26, 2026, PFE's short volume ratio of 61.2% is above PFE's 30-day rolling average of 44.2% (z-score 2.41). Meridian's dark pool model flags this reading as an anomaly.
- What does the dark pool short volume ratio measure?
- FINRA publishes daily short sale volume for trades reported off-exchange to its trade reporting facilities, which include dark pools and other off-exchange venues. The ratio divides FINRA's ShortVolume figure, which counts both short and short-exempt sales, by the total off-exchange shares reported for that day. It is not short interest and not a directional signal: market-maker hedging and reporting mechanics can raise it, so it is context for other signals.