SPDR S&P 500 ETF Trust (SPY)
AMEX: SPY
· Real-Time Price · USD
643.27
-0.17 (-0.03%)
At close: Aug 18, 2025, 3:59 PM
643.54
0.04%
After-hours: Aug 18, 2025, 07:59 PM EDT
SPY Gamma Exposure By Expiry
The total Gamma Exposure (GEX) for SPY across all expirations is -3,485,956.46 shares per 1% move, with 17,334,082.32 from calls and 20,820,038.78 from puts. The put-call GEX ratio of 1.20 indicates heavy put positioning, suggesting market makers may need to buy shares on declines (supportive) and sell on rallies (resistance). The highest gamma concentration is at the Sep 19, 25 expiration with -1,787,645.94 net GEX, which may act as a pivot point for price action. Near-term exposure for Aug 20, 25 suggests possible volatility from negative gamma effects.
SPY GEX Table
| Expiry Date | Call GEX | Put GEX | Net GEX | P/C GEX |
|---|---|---|---|---|
| Aug 20, 25 | 514,210.28 | -870,191.13 | -355,980.85 | 1.69 |
| Aug 21, 25 | 354,967.95 | -356,471.15 | -1,503.2 | 1.00 |
| Aug 22, 25 | 1,470,250.32 | -2,351,004.73 | -880,754.41 | 1.60 |
| Aug 25, 25 | 229,813.4 | -210,749.88 | 19,063.52 | 0.92 |
| Aug 26, 25 | 85,162.18 | -162,840.04 | -77,677.86 | 1.91 |
| Aug 27, 25 | 31,713.18 | -47,755.01 | -16,041.83 | 1.51 |
| Aug 28, 25 | 12,029.17 | -15,487.81 | -3,458.64 | 1.29 |
| Aug 29, 25 | 2,642,543.94 | -2,598,538.65 | 44,005.29 | 0.98 |
| Sep 5, 25 | 557,026.26 | -939,473.35 | -382,447.09 | 1.69 |
| Sep 12, 25 | 384,971.29 | -443,406.78 | -58,435.49 | 1.15 |
| Sep 19, 25 | 3,607,079.03 | -5,394,724.97 | -1,787,645.94 | 1.50 |
| Sep 26, 25 | 57,343.91 | -77,643.15 | -20,299.24 | 1.35 |
| Sep 30, 25 | 1,084,779.03 | -1,156,070.35 | -71,291.32 | 1.07 |
| Oct 17, 25 | 853,239.88 | -1,770,158.04 | -916,918.16 | 2.07 |
| Oct 31, 25 | 469,620.02 | -561,687.88 | -92,067.86 | 1.20 |
| Nov 21, 25 | 224,756.23 | -349,811.48 | -125,055.25 | 1.56 |
| Nov 28, 25 | 86,187.54 | -96,234.85 | -10,047.31 | 1.12 |
| Dec 19, 25 | 1,256,176.91 | -888,451.52 | 367,725.39 | 0.71 |
| Dec 31, 25 | 359,940.67 | -217,748.56 | 142,192.11 | 0.60 |
| Jan 16, 26 | 1,109,130.37 | -899,417.76 | 209,712.61 | 0.81 |