# Biggest options open interest changes

OI settled 2026-09-18 vs 2026-09-17.

> 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.

140 of 212 archived US symbols compared. The other 72 lacked a consecutive settlement pair in the archive for these two sessions. 15 of those compared reported an identical book in both sessions.

Across the compared symbols: 67,838 contracts changed open interest, +6,707,632 added, -758,894 removed, net +5,948,738 contracts.

## Largest open interest increases (contracts)

| Symbol | Expiry | Strike | Type | Prior OI | Current OI | Change |
|---|---|---|---|---|---|---|
| QQQ | 2026-09-25 | 705 | put | 3,066 | 32,706 | +29,640 |
| TLT | 2026-09-25 | 81.5 | call | 4,620 | 33,784 | +29,164 |
| CMG | 2026-10-30 | 28 | put | 19,027 | 47,571 | +28,544 |
| IWM | 2026-10-16 | 270 | put | 59,163 | 87,248 | +28,085 |
| QQQ | 2026-09-21 | 730 | call | 2,549 | 30,242 | +27,693 |
| MU | 2026-09-25 | 600 | put | 571 | 24,765 | +24,194 |
| TSLA | 2026-09-25 | 160 | put | 13,593 | 37,443 | +23,850 |
| QQQ | 2026-10-02 | 725 | call | 11,487 | 34,735 | +23,248 |
| XLI | 2027-01-15 | 160 | put | 6,217 | 28,622 | +22,405 |
| AAPL | 2026-09-25 | 185 | put | 20 | 21,079 | +21,059 |
| SPX | 2026-12-18 | 7,700 | call | 57,103 | 78,142 | +21,039 |
| SPY | 2026-09-22 | 722 | put | 309 | 21,264 | +20,955 |
| IWM | 2026-10-16 | 275 | put | 73,851 | 94,237 | +20,386 |
| SPY | 2026-10-30 | 745 | put | 2,229 | 22,519 | +20,290 |
| TLT | 2026-09-25 | 82 | call | 15,332 | 35,064 | +19,732 |
| SPX | 2026-12-18 | 7,700 | put | 58,156 | 77,882 | +19,726 |
| MSTR | 2026-09-25 | 155 | call | 1,080 | 20,594 | +19,514 |
| SPX | 2026-09-25 | 5,900 | put | 1,489 | 20,639 | +19,150 |
| IWM | 2026-09-25 | 293 | call | 2,609 | 21,488 | +18,879 |
| XLP | 2029-01-19 | 55 | put | 0 | 18,750 | +18,750 |

## Largest open interest decreases (contracts)

| Symbol | Expiry | Strike | Type | Prior OI | Current OI | Change |
|---|---|---|---|---|---|---|
| TLT | 2026-10-16 | 79 | put | 123,248 | 96,226 | -27,022 |
| TLT | 2026-10-16 | 77 | put | 75,411 | 48,808 | -26,603 |
| XLF | 2027-01-15 | 50 | put | 90,528 | 65,537 | -24,991 |
| QQQ | 2026-09-25 | 665 | put | 56,244 | 37,639 | -18,605 |
| IWM | 2026-09-30 | 285 | put | 68,428 | 52,578 | -15,850 |
| XLF | 2026-10-16 | 53 | put | 45,739 | 33,110 | -12,629 |
| IWM | 2026-10-16 | 271 | put | 68,770 | 57,263 | -11,507 |
| IWM | 2026-09-30 | 277 | put | 24,211 | 13,840 | -10,371 |
| TLT | 2026-09-30 | 84 | put | 10,836 | 827 | -10,009 |
| QQQ | 2026-09-25 | 690 | put | 89,968 | 80,633 | -9,335 |
| SPY | 2026-10-09 | 800 | call | 18,507 | 9,931 | -8,576 |
| XLE | 2026-09-30 | 60 | call | 6,962 | 535 | -6,427 |
| SPX | 2026-09-21 | 7,360 | put | 6,110 | 1,126 | -4,984 |
| SPY | 2026-09-28 | 780 | call | 15,717 | 10,904 | -4,813 |
| INTC | 2026-10-02 | 95 | put | 7,334 | 2,616 | -4,718 |
| SPX | 2026-09-23 | 7,000 | put | 11,364 | 6,686 | -4,678 |
| XLE | 2026-09-30 | 48 | call | 4,361 | 1 | -4,360 |
| SPX | 2026-09-21 | 7,350 | put | 6,752 | 2,428 | -4,324 |
| TLT | 2026-12-18 | 90 | call | 321,823 | 317,789 | -4,034 |
| SPX | 2026-10-02 | 6,875 | put | 7,803 | 3,859 | -3,944 |

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

Increases:

| Symbol | Expiry | Strike | Type | Prior OI | Current OI | Change |
|---|---|---|---|---|---|---|
| QQQ | 2026-09-25 | 705 | put | 3,066 | 32,706 | +29,640 |
| IWM | 2026-10-16 | 270 | put | 59,163 | 87,248 | +28,085 |
| QQQ | 2026-09-21 | 730 | call | 2,549 | 30,242 | +27,693 |
| QQQ | 2026-10-02 | 725 | call | 11,487 | 34,735 | +23,248 |
| SPY | 2026-09-22 | 722 | put | 309 | 21,264 | +20,955 |
| IWM | 2026-10-16 | 275 | put | 73,851 | 94,237 | +20,386 |
| SPY | 2026-10-30 | 745 | put | 2,229 | 22,519 | +20,290 |
| IWM | 2026-09-25 | 293 | call | 2,609 | 21,488 | +18,879 |
| IWM | 2026-10-09 | 279 | put | 375 | 18,179 | +17,804 |
| SPY | 2026-09-21 | 723 | put | 1,343 | 17,915 | +16,572 |

Decreases:

| Symbol | Expiry | Strike | Type | Prior OI | Current OI | Change |
|---|---|---|---|---|---|---|
| QQQ | 2026-09-25 | 665 | put | 56,244 | 37,639 | -18,605 |
| IWM | 2026-09-30 | 285 | put | 68,428 | 52,578 | -15,850 |
| IWM | 2026-10-16 | 271 | put | 68,770 | 57,263 | -11,507 |
| IWM | 2026-09-30 | 277 | put | 24,211 | 13,840 | -10,371 |
| QQQ | 2026-09-25 | 690 | put | 89,968 | 80,633 | -9,335 |
| SPY | 2026-10-09 | 800 | call | 18,507 | 9,931 | -8,576 |
| SPY | 2026-09-28 | 780 | call | 15,717 | 10,904 | -4,813 |
| IWM | 2026-10-16 | 273 | put | 37,619 | 34,223 | -3,396 |
| QQQ | 2027-01-15 | 700 | call | 13,476 | 10,449 | -3,027 |
| QQQ | 2027-01-15 | 700 | put | 31,966 | 29,009 | -2,957 |

## Single stocks

Increases:

| Symbol | Expiry | Strike | Type | Prior OI | Current OI | Change |
|---|---|---|---|---|---|---|
| CMG | 2026-10-30 | 28 | put | 19,027 | 47,571 | +28,544 |
| MU | 2026-09-25 | 600 | put | 571 | 24,765 | +24,194 |
| TSLA | 2026-09-25 | 160 | put | 13,593 | 37,443 | +23,850 |
| AAPL | 2026-09-25 | 185 | put | 20 | 21,079 | +21,059 |
| MSTR | 2026-09-25 | 155 | call | 1,080 | 20,594 | +19,514 |
| GRAB | 2027-01-15 | 2.5 | put | 7,304 | 25,806 | +18,502 |
| PLTR | 2026-09-25 | 180 | call | 4,391 | 22,855 | +18,464 |
| MSTR | 2026-09-25 | 150 | call | 2,669 | 20,707 | +18,038 |
| TSLA | 2026-10-02 | 200 | put | 10,097 | 27,603 | +17,506 |
| TSLA | 2026-09-21 | 355 | put | 1,378 | 18,460 | +17,082 |

Decreases:

| Symbol | Expiry | Strike | Type | Prior OI | Current OI | Change |
|---|---|---|---|---|---|---|
| INTC | 2026-10-02 | 95 | put | 7,334 | 2,616 | -4,718 |
| JNJ | 2026-09-25 | 260 | put | 6,873 | 2,945 | -3,928 |
| INTC | 2026-10-16 | 80 | put | 31,462 | 27,883 | -3,579 |
| INTC | 2026-09-25 | 103 | call | 11,281 | 8,649 | -2,632 |
| MSFT | 2026-11-20 | 420 | call | 26,382 | 23,878 | -2,504 |
| MSFT | 2026-09-25 | 570 | call | 5,300 | 2,806 | -2,494 |
| AAPL | 2027-01-15 | 270 | call | 11,612 | 9,477 | -2,135 |
| LCID | 2027-01-15 | 3 | put | 48,560 | 46,470 | -2,090 |
| MSFT | 2026-10-02 | 580 | call | 5,075 | 3,047 | -2,028 |
| MSTR | 2026-10-16 | 95 | call | 42,742 | 40,720 | -2,022 |

## Calls vs puts

| Type | Added | Removed | Net |
|---|---|---|---|
| Calls | +3,150,962 | -311,679 | +2,839,283 |
| Puts | +3,556,670 | -447,215 | +3,109,455 |

## 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 % |
|---|---|---|---|---|---|---|---|
| MSTR | 2026-09-25 | 155 | call | 1,080 | 20,594 | +19,514 | +1,806.9% |
| SPX | 2026-09-25 | 5,900 | put | 1,489 | 20,639 | +19,150 | +1,286.1% |
| TSLA | 2026-09-21 | 355 | put | 1,378 | 18,460 | +17,082 | +1,239.6% |
| SPY | 2026-09-21 | 723 | put | 1,343 | 17,915 | +16,572 | +1,234% |
| TSLA | 2026-09-25 | 367.5 | call | 1,417 | 16,954 | +15,537 | +1,096.5% |
| QQQ | 2026-09-21 | 730 | call | 2,549 | 30,242 | +27,693 | +1,086.4% |
| QQQ | 2026-09-25 | 705 | put | 3,066 | 32,706 | +29,640 | +966.7% |
| SPY | 2026-10-30 | 745 | put | 2,229 | 22,519 | +20,290 | +910.3% |
| SPY | 2026-09-22 | 725 | put | 1,695 | 17,120 | +15,425 | +910% |
| TSLA | 2026-09-25 | 220 | put | 2,252 | 19,103 | +16,851 | +748.3% |
| GOOGL | 2026-09-25 | 400 | call | 2,195 | 18,104 | +15,909 | +724.8% |
| IWM | 2026-09-25 | 293 | call | 2,609 | 21,488 | +18,879 | +723.6% |
| SPY | 2026-09-25 | 670 | put | 1,033 | 8,460 | +7,427 | +719% |
| MSTR | 2026-09-25 | 150 | call | 2,669 | 20,707 | +18,038 | +675.8% |
| QQQ | 2026-09-21 | 717 | put | 1,302 | 10,096 | +8,794 | +675.4% |
| TLT | 2026-09-25 | 81.5 | call | 4,620 | 33,784 | +29,164 | +631.3% |
| MSTR | 2026-09-25 | 148 | call | 1,605 | 11,633 | +10,028 | +624.8% |
| IWM | 2026-10-02 | 278 | put | 1,252 | 8,234 | +6,982 | +557.7% |
| QQQ | 2026-09-25 | 650 | put | 1,694 | 10,045 | +8,351 | +493% |
| QQQ | 2026-09-21 | 725 | call | 2,509 | 14,501 | +11,992 | +478% |

Decreases:

| Symbol | Expiry | Strike | Type | Prior OI | Current OI | Change | Change % |
|---|---|---|---|---|---|---|---|
| XLE | 2026-09-30 | 48 | call | 4,361 | 1 | -4,360 | -100% |
| XLE | 2026-09-30 | 50 | call | 2,475 | 4 | -2,471 | -99.8% |
| QQQ | 2026-09-21 | 712 | call | 1,021 | 14 | -1,007 | -98.6% |
| XLE | 2026-09-30 | 57.5 | call | 3,410 | 53 | -3,357 | -98.4% |
| XLE | 2026-10-16 | 55 | call | 1,991 | 35 | -1,956 | -98.2% |
| TLT | 2026-09-30 | 84 | put | 10,836 | 827 | -10,009 | -92.4% |
| XLE | 2026-09-30 | 60 | call | 6,962 | 535 | -6,427 | -92.3% |
| GILD | 2028-12-15 | 120 | call | 1,480 | 130 | -1,350 | -91.2% |
| SPX | 2026-09-21 | 7,360 | put | 6,110 | 1,126 | -4,984 | -81.6% |
| SPY | 2026-09-21 | 685 | put | 1,657 | 437 | -1,220 | -73.6% |
| SPY | 2026-09-22 | 675 | put | 1,046 | 299 | -747 | -71.4% |
| TLT | 2026-10-30 | 89 | call | 1,137 | 404 | -733 | -64.5% |
| INTC | 2026-10-02 | 95 | put | 7,334 | 2,616 | -4,718 | -64.3% |
| SPX | 2026-09-21 | 7,350 | put | 6,752 | 2,428 | -4,324 | -64% |
| SPY | 2026-12-18 | 285 | put | 1,914 | 744 | -1,170 | -61.1% |
| SPX | 2026-10-16 | 7,615 | call | 1,743 | 711 | -1,032 | -59.2% |
| JPM | 2027-03-19 | 430 | call | 1,386 | 577 | -809 | -58.4% |
| JNJ | 2026-09-25 | 260 | put | 6,873 | 2,945 | -3,928 | -57.2% |
| SPY | 2027-06-17 | 850 | put | 2,093 | 922 | -1,171 | -55.9% |
| XLE | 2026-10-16 | 56 | call | 1,759 | 820 | -939 | -53.4% |

## Top strikes, summed across expirations

| Symbol | Strike | Type | Change | Expirations summed |
|---|---|---|---|---|
| SPY | 745 | put | +50,263 | 23 |
| QQQ | 705 | put | +47,260 | 24 |
| QQQ | 725 | call | +42,056 | 26 |
| SPX | 8,000 | put | +41,119 | 22 |
| IWM | 275 | put | +40,247 | 26 |
| TLT | 82 | call | +39,094 | 23 |
| QQQ | 730 | call | +38,908 | 24 |
| IWM | 270 | put | +38,464 | 23 |
| SPX | 8,000 | call | +37,461 | 46 |
| SPX | 7,000 | put | +36,758 | 48 |
| SPX | 7,000 | call | +35,465 | 21 |
| SPY | 740 | put | +33,399 | 27 |
| TLT | 81.5 | call | +32,887 | 7 |
| SPY | 755 | put | +32,830 | 28 |
| SPX | 7,700 | call | +32,573 | 41 |
| MSTR | 155 | call | +28,863 | 18 |
| CMG | 28 | put | +28,547 | 2 |
| TLT | 77 | put | -25,934 | 18 |
| TLT | 79 | put | -25,018 | 17 |
| TSLA | 160 | put | +24,622 | 6 |

## Symbols by net change

Largest net increases:

| Symbol | Net change | Calls | Puts |
|---|---|---|---|
| SPX | +905,970 | +330,602 | +575,368 |
| SPY | +722,778 | +223,722 | +499,056 |
| QQQ | +560,446 | +241,988 | +318,458 |
| IWM | +363,620 | +131,860 | +231,760 |
| TSLA | +326,121 | +139,845 | +186,276 |
| MSTR | +311,449 | +192,945 | +118,504 |
| AAPL | +208,002 | +112,602 | +95,400 |
| MU | +158,062 | +51,585 | +106,477 |
| INTC | +149,075 | +83,945 | +65,130 |
| NFLX | +138,449 | +88,858 | +49,591 |

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/2026-09-18