QUANTUM SI INC

Ticker: QSI CUSIP: 74765K105 Class: Common Stock

ALLIANCEBERNSTEIN L.P.'s Holding History (CIK: 0001109448)

Note: Option positions (PUT/CALL) are excluded.

Q4 2025
Shares 272,180 Value ($000) $299 Avg Close $1.63 Range $1.07 - $3.10
Q3 2025
Shares 272,180 Value ($000) $384 Avg Close $1.45 Range $0.95 - $2.18
Q2 2025
Shares 272,180 Value ($000) $533 Avg Close $1.48 Range $1.02 - $2.15
Q1 2025
Shares 110,180 Value ($000) $132 Avg Close $1.92 Range $1.12 - $5.77
Q4 2024
Shares 76,080 Value ($000) $205 Avg Close $1.17 Range $0.61 - $4.14
Q3 2024
Shares 76,080 Value ($000) $67 Avg Close $0.97 Range $0.79 - $1.26
Q2 2024
Shares 76,080 Value ($000) $80 Avg Close $1.60 Range $0.73 - $1.99
Q1 2024
Shares 55,200 Value ($000) $109 Avg Close $1.75 Range $1.38 - $2.43
Q4 2023
Shares 55,200 Value ($000) $111 Avg Close $1.52 Range $1.12 - $2.31
Q3 2023
Shares 55,200 Value ($000) $92 Avg Close $2.41 Range $1.57 - $3.90
Q2 2023
Shares 45,740 Value ($000) $82 Avg Close $1.57 Range $1.36 - $1.94
Q1 2023
Shares 31,500 Value ($000) $55 Avg Close $1.97 Range $1.54 - $2.63
Q4 2022
Shares 31,500 Value ($000) $58 Avg Close $2.58 Range $1.72 - $3.61
Q3 2022
Shares 19,700 Value ($000) $54 Avg Close $3.20 Range $2.31 - $4.43
Q2 2022
Shares 10,500 Value ($000) $24 Avg Close $3.83 Range $2.22 - $4.97