# Biggest options open interest changes

OI settled 2026-09-01 vs 2026-08-31.

> Open interest change, not trades; it does not say which side opened or closed.

Source: SquawkFlow's own nightly archive of Cboe settled open interest. Updates once per session. Figures are contracts, not dollars: the archive holds no option prices.

1 of 212 archived US symbols compared. The other 211 lacked a consecutive settlement pair in the archive for these two sessions.

Across the compared symbols: 8,088 contracts changed open interest, +887,078 added, -88,621 removed, net +798,457 contracts.

## Largest open interest increases (contracts)

| Symbol | Expiry | Strike | Type | Prior OI | Current OI | Change |
|---|---|---|---|---|---|---|
| SPX | 2026-10-16 | 6,250 | put | 8,373 | 39,897 | +31,524 |
| SPX | 2026-10-16 | 6,350 | put | 1,695 | 32,946 | +31,251 |
| SPX | 2026-10-16 | 6,300 | put | 7,000 | 29,717 | +22,717 |
| SPX | 2026-10-16 | 6,200 | put | 8,184 | 30,678 | +22,494 |
| SPX | 2026-09-04 | 6,800 | put | 3,541 | 23,524 | +19,983 |
| SPX | 2026-09-04 | 6,300 | put | 2,711 | 21,572 | +18,861 |
| SPX | 2026-09-30 | 7,000 | put | 24,445 | 36,601 | +12,156 |
| SPX | 2026-09-02 | 7,735 | call | 422 | 10,148 | +9,726 |
| SPX | 2026-09-02 | 7,835 | call | 1,087 | 10,211 | +9,124 |
| SPX | 2026-12-31 | 8,190 | call | 28,545 | 37,545 | +9,000 |
| SPX | 2026-12-31 | 8,180 | call | 41,037 | 49,287 | +8,250 |
| SPX | 2026-10-02 | 6,875 | put | 3 | 7,809 | +7,806 |
| SPX | 2026-10-02 | 6,900 | put | 284 | 7,959 | +7,675 |
| SPX | 2027-06-17 | 800 | put | 4,350 | 11,650 | +7,300 |
| SPX | 2026-09-30 | 8,000 | put | 6,134 | 13,014 | +6,880 |
| SPX | 2026-09-30 | 7,000 | call | 7,019 | 13,860 | +6,841 |
| SPX | 2026-09-30 | 8,200 | call | 13,446 | 19,561 | +6,115 |
| SPX | 2026-09-02 | 7,675 | call | 460 | 6,185 | +5,725 |
| SPX | 2026-09-02 | 7,500 | put | 1,929 | 7,291 | +5,362 |
| SPX | 2026-09-02 | 7,450 | put | 2,697 | 7,980 | +5,283 |

## Largest open interest decreases (contracts)

| Symbol | Expiry | Strike | Type | Prior OI | Current OI | Change |
|---|---|---|---|---|---|---|
| SPX | 2026-12-31 | 8,200 | call | 36,218 | 21,222 | -14,996 |
| SPX | 2026-09-18 | 7,000 | put | 353,646 | 349,207 | -4,439 |
| SPX | 2026-09-18 | 8,000 | call | 284,268 | 281,013 | -3,255 |
| SPX | 2026-09-18 | 7,000 | call | 337,738 | 334,770 | -2,968 |
| SPX | 2026-09-18 | 6,950 | put | 18,092 | 15,157 | -2,935 |
| SPX | 2026-09-18 | 8,000 | put | 269,749 | 266,816 | -2,933 |
| SPX | 2026-09-21 | 6,200 | put | 6,955 | 5,146 | -1,809 |
| SPX | 2026-09-18 | 7,200 | put | 35,473 | 33,711 | -1,762 |
| SPX | 2026-09-18 | 7,225 | put | 7,672 | 5,938 | -1,734 |
| SPX | 2026-09-18 | 6,890 | put | 4,460 | 3,144 | -1,316 |
| SPX | 2026-09-25 | 6,100 | put | 5,134 | 3,910 | -1,224 |
| SPX | 2026-10-16 | 6,500 | put | 20,410 | 19,284 | -1,126 |
| SPX | 2026-09-04 | 7,810 | call | 3,565 | 2,561 | -1,004 |
| SPX | 2026-10-16 | 7,100 | put | 15,534 | 14,703 | -831 |
| SPX | 2026-09-18 | 8,175 | call | 3,994 | 3,302 | -692 |
| SPX | 2026-09-18 | 5,850 | put | 6,619 | 5,945 | -674 |
| SPX | 2026-09-04 | 7,575 | put | 2,222 | 1,568 | -654 |
| SPX | 2026-09-18 | 7,825 | call | 9,527 | 8,890 | -637 |
| SPX | 2027-06-17 | 7,400 | put | 15,719 | 15,117 | -602 |
| SPX | 2026-09-18 | 7,850 | call | 17,845 | 17,259 | -586 |

## Index ETFs (SPY, QQQ, IWM, DIA)

Increases:

None in this pair.

Decreases:

None in this pair.

## Single stocks

Increases:

None in this pair.

Decreases:

None in this pair.

## Calls vs puts

| Type | Added | Removed | Net |
|---|---|---|---|
| Calls | +278,477 | -43,388 | +235,089 |
| Puts | +608,601 | -45,233 | +563,368 |

## Biggest percent changes

Percent changes only for contracts with at least 1,000 prior open interest.

Increases:

| Symbol | Expiry | Strike | Type | Prior OI | Current OI | Change | Change % |
|---|---|---|---|---|---|---|---|
| SPX | 2026-10-16 | 6,350 | put | 1,695 | 32,946 | +31,251 | +1,843.7% |
| SPX | 2026-09-02 | 7,835 | call | 1,087 | 10,211 | +9,124 | +839.4% |
| SPX | 2026-09-04 | 6,300 | put | 2,711 | 21,572 | +18,861 | +695.7% |
| SPX | 2026-09-04 | 6,800 | put | 3,541 | 23,524 | +19,983 | +564.3% |
| SPX | 2026-10-16 | 6,250 | put | 8,373 | 39,897 | +31,524 | +376.5% |
| SPX | 2026-10-16 | 6,300 | put | 7,000 | 29,717 | +22,717 | +324.5% |
| SPX | 2026-09-02 | 7,500 | put | 1,929 | 7,291 | +5,362 | +278% |
| SPX | 2026-10-16 | 6,200 | put | 8,184 | 30,678 | +22,494 | +274.9% |
| SPX | 2027-01-15 | 9,600 | call | 1,695 | 6,033 | +4,338 | +255.9% |
| SPX | 2026-12-31 | 7,500 | put | 1,002 | 3,235 | +2,233 | +222.9% |
| SPX | 2026-09-02 | 7,475 | put | 2,296 | 7,140 | +4,844 | +211% |
| SPX | 2026-09-02 | 7,350 | put | 1,813 | 5,458 | +3,645 | +201% |
| SPX | 2026-09-02 | 7,700 | call | 1,651 | 4,917 | +3,266 | +197.8% |
| SPX | 2026-09-02 | 7,450 | put | 2,697 | 7,980 | +5,283 | +195.9% |
| SPX | 2026-09-02 | 7,400 | put | 1,724 | 4,958 | +3,234 | +187.6% |
| SPX | 2026-09-02 | 7,825 | call | 1,042 | 2,839 | +1,797 | +172.5% |
| SPX | 2027-06-17 | 800 | put | 4,350 | 11,650 | +7,300 | +167.8% |
| SPX | 2026-09-02 | 7,725 | call | 2,103 | 5,329 | +3,226 | +153.4% |
| SPX | 2026-09-02 | 7,595 | put | 1,158 | 2,893 | +1,735 | +149.8% |
| SPX | 2026-09-02 | 6,700 | put | 1,102 | 2,668 | +1,566 | +142.1% |

Decreases:

| Symbol | Expiry | Strike | Type | Prior OI | Current OI | Change | Change % |
|---|---|---|---|---|---|---|---|
| SPX | 2026-12-31 | 8,200 | call | 36,218 | 21,222 | -14,996 | -41.4% |
| SPX | 2026-09-18 | 6,890 | put | 4,460 | 3,144 | -1,316 | -29.5% |
| SPX | 2026-09-04 | 7,575 | put | 2,222 | 1,568 | -654 | -29.4% |
| SPX | 2026-09-02 | 7,690 | put | 1,149 | 814 | -335 | -29.2% |
| SPX | 2026-09-04 | 7,810 | call | 3,565 | 2,561 | -1,004 | -28.2% |
| SPX | 2026-09-16 | 7,925 | call | 1,566 | 1,141 | -425 | -27.1% |
| SPX | 2026-09-02 | 7,600 | call | 1,055 | 773 | -282 | -26.7% |
| SPX | 2026-09-21 | 6,200 | put | 6,955 | 5,146 | -1,809 | -26% |
| SPX | 2026-09-25 | 6,100 | put | 5,134 | 3,910 | -1,224 | -23.8% |
| SPX | 2026-09-18 | 7,225 | put | 7,672 | 5,938 | -1,734 | -22.6% |
| SPX | 2026-09-02 | 7,700 | put | 1,273 | 1,000 | -273 | -21.4% |
| SPX | 2027-12-17 | 8,150 | call | 1,700 | 1,348 | -352 | -20.7% |
| SPX | 2026-09-21 | 7,875 | call | 1,495 | 1,211 | -284 | -19% |
| SPX | 2026-09-18 | 8,175 | call | 3,994 | 3,302 | -692 | -17.3% |
| SPX | 2026-09-18 | 6,950 | put | 18,092 | 15,157 | -2,935 | -16.2% |
| SPX | 2026-12-18 | 8,275 | call | 1,879 | 1,578 | -301 | -16% |
| SPX | 2026-09-15 | 6,200 | put | 1,525 | 1,324 | -201 | -13.2% |
| SPX | 2026-09-18 | 8,275 | call | 2,505 | 2,183 | -322 | -12.9% |
| SPX | 2027-02-19 | 8,100 | call | 1,599 | 1,396 | -203 | -12.7% |
| SPX | 2026-09-10 | 5,600 | put | 1,613 | 1,413 | -200 | -12.4% |

## Top strikes, summed across expirations

| Symbol | Strike | Type | Change | Expirations summed |
|---|---|---|---|---|
| SPX | 6,300 | put | +50,223 | 36 |
| SPX | 6,350 | put | +32,366 | 11 |
| SPX | 6,250 | put | +31,673 | 12 |
| SPX | 6,200 | put | +23,063 | 41 |
| SPX | 6,800 | put | +22,337 | 36 |
| SPX | 7,500 | put | +22,283 | 49 |
| SPX | 7,000 | put | +16,920 | 49 |
| SPX | 7,350 | put | +14,048 | 41 |
| SPX | 7,735 | call | +11,285 | 17 |
| SPX | 7,835 | call | +10,692 | 12 |
| SPX | 7,650 | put | +10,667 | 46 |
| SPX | 6,900 | put | +10,277 | 38 |
| SPX | 7,000 | call | +10,142 | 13 |
| SPX | 7,600 | put | +9,154 | 44 |
| SPX | 8,190 | call | +9,063 | 4 |
| SPX | 7,450 | put | +9,011 | 41 |
| SPX | 7,650 | call | +8,488 | 46 |
| SPX | 6,875 | put | +8,259 | 21 |
| SPX | 8,180 | call | +8,252 | 4 |
| SPX | 8,000 | put | +8,115 | 20 |

## Symbols by net change

Largest net increases:

| Symbol | Net change | Calls | Puts |
|---|---|---|---|
| SPX | +798,457 | +235,089 | +563,368 |

Largest net decreases:

None in this pair.

## Archive

- https://squawkflow.com/oi-changes/2026-10-08.md (2026-10-08 vs 2026-10-07, 158 symbols)
- https://squawkflow.com/oi-changes/2026-10-07.md (2026-10-07 vs 2026-10-06, 135 symbols)
- https://squawkflow.com/oi-changes/2026-10-06.md (2026-10-06 vs 2026-10-05, 136 symbols)
- https://squawkflow.com/oi-changes/2026-10-05.md (2026-10-05 vs 2026-10-02, 155 symbols)
- https://squawkflow.com/oi-changes/2026-10-02.md (2026-10-02 vs 2026-10-01, 148 symbols)
- https://squawkflow.com/oi-changes/2026-10-01.md (2026-10-01 vs 2026-09-30, 156 symbols)
- https://squawkflow.com/oi-changes/2026-09-30.md (2026-09-30 vs 2026-09-29, 148 symbols)
- https://squawkflow.com/oi-changes/2026-09-29.md (2026-09-29 vs 2026-09-28, 150 symbols)
- https://squawkflow.com/oi-changes/2026-09-28.md (2026-09-28 vs 2026-09-25, 150 symbols)
- https://squawkflow.com/oi-changes/2026-09-25.md (2026-09-25 vs 2026-09-24, 135 symbols)

SPX open interest change by strike: https://squawkflow.com/oi-change.md

Canonical: https://squawkflow.com/oi-changes/2026-09-01