ILMN Dark Pool Activity
Illumina Inc
Data as of Oct 27, 2026 · Source: FINRA daily short sale volume (off-exchange)
On Oct 27, 2026, FINRA reported 927K ILMN shares in publicly disseminated off-exchange trades (dark pools and other off-exchange venues). 452K of those shares (48.7%) were marked short or short-exempt, below ILMN's 30-day rolling average of 54.5% (z-score -0.40). Over the last 10 FINRA sessions (Oct 14, 2026 – Oct 27, 2026), ILMN's off-exchange short volume ratio ranged from 34.5% to 73.9% and averaged 60.1%; the latest reading is below that 10-session average.
Off-Exchange Volume
927K
Short Volume
452K
Short Volume Ratio
48.7%
30-Day Average
54.5%
z-score -0.40
Daily readings — last 10 FINRA sessions
| Date | Off-exchange shares | Short shares | Short ratio |
|---|---|---|---|
| Oct 14, 2026 | 920K | 498K | 54.1% |
| Oct 15, 2026 | 1.2M | 760K | 65.5% |
| Oct 16, 2026 | 970K | 628K | 64.8% |
| Oct 19, 2026 | 800K | 592K | 73.9% |
| Oct 20, 2026 | 637K | 455K | 71.5% |
| Oct 21, 2026 | 912K | 632K | 69.3% |
| Oct 22, 2026 | 949K | 586K | 61.7% |
| Oct 23, 2026 | 532K | 304K | 57.1% |
| Oct 26, 2026 | 565K | 195K | 34.5% |
| Oct 27, 2026 Latest | 927K | 452K | 48.7% |
Source: FINRA daily short sale volume (off-exchange). Ratio = ShortVolume ÷ TotalVolume for the day.
ILMN dark pool FAQ
- How much ILMN off-exchange volume did FINRA report on Oct 27, 2026?
- FINRA's daily short sale volume file reported 927K ILMN shares in publicly disseminated off-exchange trades on Oct 27, 2026; 452K of those shares (48.7%) were marked short or short-exempt.
- Is ILMN's dark pool short volume ratio unusual right now?
- As of Oct 27, 2026, ILMN's short volume ratio of 48.7% is below ILMN's 30-day rolling average of 54.5% (z-score -0.40). Meridian's dark pool model does not flag 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.