# Biggest options open interest changes

OI settled 2026-08-31 vs 2026-08-28.

> 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: 7,826 contracts changed open interest, +492,757 added, -210,676 removed, net +282,081 contracts.

## Largest open interest increases (contracts)

| Symbol | Expiry | Strike | Type | Prior OI | Current OI | Change |
|---|---|---|---|---|---|---|
| SPX | 2026-09-03 | 7,500 | put | 459 | 6,643 | +6,184 |
| SPX | 2026-09-03 | 7,490 | put | 210 | 6,254 | +6,044 |
| SPX | 2026-12-31 | 5,500 | call | 91 | 6,090 | +5,999 |
| SPX | 2026-12-18 | 8,000 | put | 140,212 | 145,325 | +5,113 |
| SPX | 2026-12-18 | 8,000 | call | 160,923 | 166,017 | +5,094 |
| SPX | 2026-10-16 | 7,790 | call | 263 | 5,288 | +5,025 |
| SPX | 2026-10-30 | 8,490 | call | 50 | 5,038 | +4,988 |
| SPX | 2026-12-18 | 7,000 | call | 185,935 | 190,855 | +4,920 |
| SPX | 2026-10-16 | 7,870 | call | 491 | 5,387 | +4,896 |
| SPX | 2026-10-16 | 8,000 | call | 136,705 | 141,595 | +4,890 |
| SPX | 2026-12-31 | 7,600 | call | 1,073 | 5,957 | +4,884 |
| SPX | 2027-03-19 | 6,750 | put | 2,183 | 7,014 | +4,831 |
| SPX | 2026-09-18 | 7,000 | call | 332,960 | 337,738 | +4,778 |
| SPX | 2026-10-30 | 8,900 | call | 4,994 | 9,710 | +4,716 |
| SPX | 2026-09-30 | 8,000 | call | 15,787 | 20,247 | +4,460 |
| SPX | 2026-10-16 | 7,000 | call | 126,569 | 130,597 | +4,028 |
| SPX | 2026-10-16 | 8,000 | put | 124,444 | 128,446 | +4,002 |
| SPX | 2026-10-16 | 7,000 | put | 138,490 | 142,483 | +3,993 |
| SPX | 2026-09-18 | 7,700 | call | 41,717 | 45,650 | +3,933 |
| SPX | 2026-12-18 | 7,000 | put | 195,125 | 199,048 | +3,923 |

## Largest open interest decreases (contracts)

| Symbol | Expiry | Strike | Type | Prior OI | Current OI | Change |
|---|---|---|---|---|---|---|
| SPX | 2026-09-01 | 7,530 | put | 6,301 | 0 | -6,301 |
| SPX | 2026-09-01 | 7,520 | put | 6,211 | 0 | -6,211 |
| SPX | 2026-09-30 | 6,500 | put | 11,501 | 7,094 | -4,407 |
| SPX | 2026-09-01 | 6,200 | put | 4,244 | 0 | -4,244 |
| SPX | 2026-09-18 | 7,695 | call | 13,272 | 9,514 | -3,758 |
| SPX | 2026-09-18 | 7,610 | call | 9,261 | 5,601 | -3,660 |
| SPX | 2026-09-01 | 7,340 | put | 3,114 | 0 | -3,114 |
| SPX | 2026-09-01 | 7,875 | call | 2,791 | 0 | -2,791 |
| SPX | 2026-09-01 | 7,325 | put | 2,545 | 0 | -2,545 |
| SPX | 2026-09-01 | 7,450 | put | 2,294 | 0 | -2,294 |
| SPX | 2026-09-01 | 7,550 | put | 2,213 | 0 | -2,213 |
| SPX | 2026-09-03 | 7,550 | put | 5,275 | 3,245 | -2,030 |
| SPX | 2026-09-01 | 6,000 | put | 1,931 | 0 | -1,931 |
| SPX | 2026-09-18 | 8,100 | call | 22,981 | 21,138 | -1,843 |
| SPX | 2026-09-01 | 7,815 | call | 1,775 | 0 | -1,775 |
| SPX | 2026-09-08 | 7,600 | call | 2,494 | 740 | -1,754 |
| SPX | 2026-09-09 | 7,650 | call | 3,001 | 1,288 | -1,713 |
| SPX | 2026-09-09 | 7,625 | call | 3,078 | 1,367 | -1,711 |
| SPX | 2026-09-18 | 7,200 | put | 37,133 | 35,473 | -1,660 |
| SPX | 2026-09-01 | 7,800 | call | 1,647 | 0 | -1,647 |

## 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 | +210,922 | -82,939 | +127,983 |
| Puts | +281,835 | -127,737 | +154,098 |

## 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 | 2026-12-31 | 7,600 | call | 1,073 | 5,957 | +4,884 | +455.2% |
| SPX | 2027-03-19 | 6,750 | put | 2,183 | 7,014 | +4,831 | +221.3% |
| SPX | 2026-09-11 | 7,650 | put | 1,757 | 4,924 | +3,167 | +180.3% |
| SPX | 2026-09-11 | 6,600 | put | 1,117 | 2,851 | +1,734 | +155.2% |
| SPX | 2026-09-16 | 7,675 | call | 1,182 | 2,990 | +1,808 | +153% |
| SPX | 2026-09-16 | 7,625 | put | 1,210 | 2,999 | +1,789 | +147.9% |
| SPX | 2026-09-16 | 7,650 | call | 1,580 | 3,860 | +2,280 | +144.3% |
| SPX | 2026-09-08 | 7,800 | call | 1,066 | 2,602 | +1,536 | +144.1% |
| SPX | 2026-09-16 | 7,650 | put | 1,653 | 4,004 | +2,351 | +142.2% |
| SPX | 2026-09-23 | 6,000 | put | 1,197 | 2,801 | +1,604 | +134% |
| SPX | 2026-09-04 | 5,800 | put | 1,643 | 3,608 | +1,965 | +119.6% |
| SPX | 2026-09-02 | 7,725 | call | 1,018 | 2,103 | +1,085 | +106.6% |
| SPX | 2026-09-08 | 5,800 | put | 1,185 | 2,325 | +1,140 | +96.2% |
| SPX | 2026-10-30 | 8,900 | call | 4,994 | 9,710 | +4,716 | +94.4% |
| SPX | 2026-12-31 | 6,900 | call | 1,838 | 3,535 | +1,697 | +92.3% |
| SPX | 2027-01-15 | 7,250 | put | 3,137 | 5,922 | +2,785 | +88.8% |
| SPX | 2026-09-02 | 7,450 | put | 1,470 | 2,697 | +1,227 | +83.5% |
| SPX | 2026-09-30 | 7,325 | put | 1,012 | 1,787 | +775 | +76.6% |
| SPX | 2026-09-18 | 7,705 | call | 3,623 | 6,389 | +2,766 | +76.3% |
| SPX | 2026-09-02 | 7,500 | put | 1,102 | 1,929 | +827 | +75% |

Decreases:

| Symbol | Expiry | Strike | Type | Prior OI | Current OI | Change | Change % |
|---|---|---|---|---|---|---|---|
| SPX | 2026-09-01 | 7,530 | put | 6,301 | 0 | -6,301 | -100% |
| SPX | 2026-09-01 | 7,520 | put | 6,211 | 0 | -6,211 | -100% |
| SPX | 2026-09-01 | 6,200 | put | 4,244 | 0 | -4,244 | -100% |
| SPX | 2026-09-01 | 7,340 | put | 3,114 | 0 | -3,114 | -100% |
| SPX | 2026-09-01 | 7,875 | call | 2,791 | 0 | -2,791 | -100% |
| SPX | 2026-09-01 | 7,325 | put | 2,545 | 0 | -2,545 | -100% |
| SPX | 2026-09-01 | 7,450 | put | 2,294 | 0 | -2,294 | -100% |
| SPX | 2026-09-01 | 7,550 | put | 2,213 | 0 | -2,213 | -100% |
| SPX | 2026-09-01 | 6,000 | put | 1,931 | 0 | -1,931 | -100% |
| SPX | 2026-09-01 | 7,815 | call | 1,775 | 0 | -1,775 | -100% |
| SPX | 2026-09-01 | 7,800 | call | 1,647 | 0 | -1,647 | -100% |
| SPX | 2026-09-01 | 7,810 | call | 1,615 | 0 | -1,615 | -100% |
| SPX | 2026-09-01 | 7,750 | call | 1,467 | 0 | -1,467 | -100% |
| SPX | 2026-09-01 | 7,725 | put | 1,391 | 0 | -1,391 | -100% |
| SPX | 2026-09-01 | 7,690 | put | 1,386 | 0 | -1,386 | -100% |
| SPX | 2026-09-01 | 7,950 | call | 1,345 | 0 | -1,345 | -100% |
| SPX | 2026-09-01 | 7,850 | call | 1,329 | 0 | -1,329 | -100% |
| SPX | 2026-09-01 | 6,100 | put | 1,308 | 0 | -1,308 | -100% |
| SPX | 2026-09-01 | 5,600 | put | 1,306 | 0 | -1,306 | -100% |
| SPX | 2026-09-01 | 7,445 | put | 1,258 | 0 | -1,258 | -100% |

## Top strikes, summed across expirations

| Symbol | Strike | Type | Change | Expirations summed |
|---|---|---|---|---|
| SPX | 8,000 | call | +22,980 | 47 |
| SPX | 8,000 | put | +17,003 | 23 |
| SPX | 7,000 | put | +15,885 | 43 |
| SPX | 7,000 | call | +15,386 | 23 |
| SPX | 7,500 | put | +11,515 | 44 |
| SPX | 7,700 | call | +7,968 | 45 |
| SPX | 7,700 | put | +6,340 | 44 |
| SPX | 7,680 | call | +6,198 | 26 |
| SPX | 5,500 | call | +6,014 | 2 |
| SPX | 7,490 | put | +6,013 | 20 |
| SPX | 7,650 | put | +5,955 | 40 |
| SPX | 8,150 | call | +5,619 | 28 |
| SPX | 7,530 | put | -5,420 | 21 |
| SPX | 7,800 | call | +5,096 | 43 |
| SPX | 7,520 | put | -5,033 | 21 |
| SPX | 7,790 | call | +5,000 | 24 |
| SPX | 8,490 | call | +4,994 | 2 |
| SPX | 7,950 | call | +4,943 | 34 |
| SPX | 6,750 | put | +4,926 | 28 |
| SPX | 7,870 | call | +4,843 | 22 |

## Symbols by net change

Largest net increases:

| Symbol | Net change | Calls | Puts |
|---|---|---|---|
| SPX | +282,081 | +127,983 | +154,098 |

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/2026-08-31