Research Open Interest Daily All issues

The VIX call book grew for a third session

OI 13.39M vs 14.35M 5-day ADV. 56 percent calls. SPX closed 7,642, down 0.9 percent from Wednesday. VIX rose 8 percent to 16.05.

OI 13.39M vs 14.35M 5-day ADV. 7.48M calls, 5.91M puts. Benchmarks opens right, closes left.

SPY puts: 446k / 372k / 308k over the last three sessions. SPX puts 261k against 283k. VIX calls 291k / 337k / 410k. TLT opened 82k puts against 134k calls, after 179k calls the session before. Single stocks took 58 percent of the new interest, below their own average.

US listed options

How Stocks, ETFs and Indices Changed, vs Average Daily Change

Put/call of contracts opened, with the five-day mark. Today versus the prior five sessions.

Put/call
vs ADV
Stocks7.75M
1.00.66×
1.00.91×
ETFs4.46M
1.17×
0.97×
Indices1.18M
0.55×
0.93×
← put-heavycall-heavy →5-day put/call
← below ADVabove ADV →

Put/call = puts opened ÷ calls opened. Opened means contracts that gained open interest, study to settle. The gold mark is that same ratio over the prior five sessions (puts opened in the window ÷ calls opened in the window). Scale is log 0.5–2.0; 1.0 is an even split. Above 1.0 sits left (put-heavy).

vs ADV = contracts opened today ÷ the mean opened over those five sessions. Scale is log 0.5–2.0; 1.0 is the usual size.

FZN Analytics · settled open interest, 20–21 Aug 2026 · ADV window 13–19 Aug

Just under 58 percent of contracts opened on Thursday were single stocks. That is where the book sat: not in the index complex, which printed 1.18 million, 9 percent of the day.

The exception on the figure is exchange-traded funds, the only class where puts outran calls — 2.41M against 2.05M. They have on 4 of the last 5 sessions. Stocks opened calls on all 5. That shape is the standing book.

US single stocks · by sector

How each sector changed, vs average daily change

Put/call of contracts opened, with the five-day mark. Today versus the prior five sessions.

Put/call
vs ADV
Technology2.57M
1.00.69×
1.00.78×
Financials1.20M
0.84×
1.17×
Consumer Cyclical0.76M
0.67×
0.76×
Industrials0.74M
0.70×
1.05×
Healthcare0.63M
0.64×
1.05×
Communications0.54M
0.62×
0.74×
Consumer Defensive0.37M
0.49×
1.52×
Energy0.36M
0.32×
1.12×
Materials0.33M
0.60×
1.17×
Utilities0.15M
0.43×
1.13×
Real Estate95k
0.71×
0.82×
← put-heavycall-heavy →5-day put/call
← below ADVabove ADV →

Put/call = puts opened ÷ calls opened. Opened means contracts that gained open interest, study to settle. The gold mark is that same ratio over the prior five sessions (puts opened in the window ÷ calls opened in the window). Scale is log 0.5–2.0; 1.0 is an even split. Above 1.0 sits left (put-heavy). A mark on the right edge means the five-day put/call is below 0.5.

vs ADV = contracts opened today ÷ the mean opened over those five sessions. Scale is log 0.5–2.0; 1.0 is the usual size.

FZN Analytics · settled open interest, 20–21 Aug 2026 · ADV window 13–19 Aug · common stock and ADRs

Consumer Defensive opened 1.52× its 5-day ADV. Materials 1.17×. Technology was 0.78× — the large book was below its usual size.

the volatility complex, every day

Of the 0.33M VIX calls added net, 0.23M landed in the 16 September expiry. The front (26 August, 5d) added 23k calls.

Which expiry took the flow

Change in open interest by expiry, with at-the-money implied volatility. Each expiry prices off its own future.

Which expiry took the flowChange in VIX open interest by expiry, calls against puts, with at-the-money implied volatility.010k20k30k40k50k60k70k80k90k100k110k120k130k140k150k160k170k180k190k200k210k220k230k240k250k260k26 Aug5d234k16 Sep26d21 Oct61d79k18 Nov89d16 Dec117d124%122%112%145%callsputsimplied vol

The standing call book is still the ladder. The session’s largest add was the 20s, 60k calls onto a standing 0.52M.

What the change built onto

Contracts outstanding — pale is Thursday's open, solid is what the session added.

What the change built ontoVIX contracts outstanding by strike. Pale is Thursday's open, solid is what the session added.spot $16.05656050353025232220+60k191716← PUTSCALLS →
Thursday's open session added ← puts calls →

Open interest change is settle minus study. Opened, in the paragraph, means contracts that gained open interest.

A VIX option prices off the future for its own expiry, not spot VIX. Implied vol is the median over a tight at-the-money band (delta 0.4–0.6) on the study tape, 13:30–20:57 UTC. VIX option IV is vol-of-vol; it prints near 150 percent, not 15.

FZN Analytics · settled open interest, 20–21 Aug 2026 · ADV window 13–19 Aug · VIX + VIXW

Two cuts. Thursday versus each name’s own five-day average — IOVA 5.1×, AGNC 3.8×. And a three-day run after a quiet book: ETHA 0.11M / 0.33M / 0.18M against a 41k median. A package (HYG, QXO, GDX) stays off the figure. Pre-earnings and earnings-day names are off the board (PDD, KSS, IREN, ROST).

open interest · by name

Contracts opened 20 August versus each name’s five-day average

A reading of 1× is that name’s usual day. Colour is put or call of the contracts that opened. The bar is capped at 8×; a reading off-scale is labelled.

1×4×8×
IOVA41k
5.13×
AGNC32k
3.76×
puts opened calls opened 1× = that name’s usual day

Multiple = contracts that gained open interest, study to settle, divided by the mean of that same measure over the prior five sessions (13–19 Aug). Scale is linear 0–8. Colour is puts opened ÷ calls opened. Option-volume ADV ≥ 5k, standing OI ≥ 10k, at least 8k opened, not a package, not pre-earnings or earnings-day.

FZN Analytics · settled open interest, 20–21 Aug 2026 · ADV window 13–19 Aug · proposal, not locked

open interest · by name

Three-day run after a quiet book

Each of the last three sessions opened at least twice the median of the ten sessions before that.

NameQuiet medianTue 18 · Wed 19 · Thu 20vs 5-day ADV
ETHA41k0.11M · 0.33M · 0.18M1.62×
KLAR5.5k27k · 15k · 12k0.71×
XOP5.1k15k · 18k · 22k2.40×
LUV3.7k9.7k · 7.9k · 11k1.86×
MSTX1.6k4.3k · 5.1k · 4.3k1.23×
VIK6094.2k · 4.4k · 1.4k0.55×
IEP4907.7k · 4.1k · 2.5k0.87×
UTHR4842.5k · 16k · 3.0k0.28×
Q3718.3k · 3.2k · 1.3k0.49×
AMTX84984 · 581 · 2480.70×
ASTL2614k · 19k · 2750.04×

Quiet median is the median of contracts opened over the ten sessions before the three-day run, same two-bucket query.

FZN Analytics · settled open interest, 20–21 Aug 2026 · ADV window 13–19 Aug · proposal, not locked

IOVA · Iovance Biotherapeutics, Inc

Thursday versus its own five-day average

Last
$8.99 +12.5%
Sector
Healthcare · Biotechnology
Market cap
$3.57B
Earnings
5 Nov

5.1× its own five-day average — 41k opened, put-heavy.

IOVA open interest change by expiry

Change in open interest by expiry, 20 August. At-the-money implied vol, tape truncated, 13:30–19:59 UTC.

IOVA open interest change by expiryChange in IOVA open interest by expiry, calls against puts, with at-the-money implied volatility.010k20k30k40k28 Aug7d4 Sep14d18 Sep28d29k21 Jan518d102%87%80%110%callsputsimplied vol

FZN Analytics · settled open interest, 20–21 Aug 2026 · IOVA

IOVA contracts outstanding by strike

Pale is Thursday’s open, solid is what the session added.

IOVA contracts outstanding by strikeIOVA contracts outstanding by strike. Pale is Thursday's open, solid is what the session added.spot $8.99201512.510+10k9.5987.55.5+19k543.532← PUTSCALLS →
Thursday’s opensession added← putscalls →

FZN Analytics · settled open interest, 20–21 Aug 2026 · IOVA

AGNC · AGNC Investment Corp

Thursday versus its own five-day average

Last
$10.92 -1.4%
Sector
Real Estate · REIT - Mortgage
Market cap
$12.72B
Earnings
19 Oct

3.8× its own five-day average — 32k opened, call-heavy.

AGNC open interest change by expiry

Change in open interest by expiry, 20 August. At-the-money implied vol, tape truncated, 13:30–19:59 UTC.

AGNC open interest change by expiryChange in AGNC open interest by expiry, calls against puts, with at-the-money implied volatility.05.0k10k15k28 Aug7d5.0k11 Sep21d3.9k25 Sep35d11k7.2k16 Oct56d18 Dec119d21 Jan518d19%14%13%28%callsputsimplied vol

FZN Analytics · settled open interest, 20–21 Aug 2026 · AGNC

AGNC contracts outstanding by strike

Pale is Thursday’s open, solid is what the session added.

AGNC contracts outstanding by strikeAGNC contracts outstanding by strike. Pale is Thursday's open, solid is what the session added.spot $10.9215131211.51110.510985← PUTSCALLS →
Thursday’s opensession added← putscalls →

FZN Analytics · settled open interest, 20–21 Aug 2026 · AGNC

ETHA · iShares Ethereum Trust ETF

3-day run after a quiet book

Last
$17.55 +10.5%
Sector
Financial Services · Asset Management - Cryptocurrency
Market cap
$9.70B
Earnings
—

Three-day run after a quiet book: 0.11M / 0.33M / 0.18M against a 41k median.

ETHA open interest change by expiry

Change in open interest by expiry, 20 August. At-the-money implied vol, tape truncated, 13:30–19:59 UTC.

ETHA open interest change by expiryChange in ETHA open interest by expiry, calls against puts, with at-the-money implied volatility.010k20k30k40k31k12k28 Aug7d10k11 Sep21d21k18 Sep28d11k16 Oct56d18k18 Dec119d15 Jan147d17 Dec483d21 Jan518d59%63%50%68%callsputsimplied vol

FZN Analytics · settled open interest, 20–21 Aug 2026 · ETHA

ETHA contracts outstanding by strike

Pale is Thursday’s open, solid is what the session added.

ETHA contracts outstanding by strikeETHA contracts outstanding by strike. Pale is Thursday's open, solid is what the session added.spot $17.55252220+24k191817.5+15k171615141312115← PUTSCALLS →
Thursday’s opensession added← putscalls →

FZN Analytics · settled open interest, 20–21 Aug 2026 · ETHA

KLAR · Klarna Group plc

3-day run after a quiet book

Last
$14.00 -4.9%
Sector
Financial Services · Financial - Credit Services
Market cap
$5.56B
Earnings
17 Nov

Three-day run after a quiet book: 27k / 15k / 12k against a 5.5k median.

KLAR open interest change by expiry

Change in open interest by expiry, 20 August. At-the-money implied vol, tape truncated, 13:30–19:59 UTC.

KLAR open interest change by expiryChange in KLAR open interest by expiry, calls against puts, with at-the-money implied volatility.02.0k4.0k68585228 Aug7d3.0k18 Sep28d95916 Oct56d18 Dec119d15 Jan147d19 Mar210d21 Jan518d55%65%48%70%callsputsimplied vol

FZN Analytics · settled open interest, 20–21 Aug 2026 · KLAR

KLAR contracts outstanding by strike

Pale is Thursday’s open, solid is what the session added.

KLAR contracts outstanding by strikeKLAR contracts outstanding by strike. Pale is Thursday's open, solid is what the session added.spot $14.004540302522.52017.515+3.7k1413.512.5+1.9k10← PUTSCALLS →
Thursday’s opensession added← putscalls →

FZN Analytics · settled open interest, 20–21 Aug 2026 · KLAR

XOP · State Street SPDR S&P Oil & Gas Exploration & Production ETF

3-day run after a quiet book

Last
$187.45 +0.6%
Sector
Financial Services · Asset Management - Global
Market cap
$3.06B
Earnings
—

Three-day run after a quiet book: 15k / 18k / 22k against a 5.1k median.

XOP open interest change by expiry

Change in open interest by expiry, 20 August. At-the-money implied vol, 13:30–20:11 UTC.

XOP open interest change by expiryChange in XOP open interest by expiry, calls against puts, with at-the-money implied volatility.05.0k10k15k10k4 Sep14d2.3k18 Sep28d16 Oct56d18 Dec119d1.9k15 Jan147d3.9k19 Mar210d32%35%29%37%callsputsimplied vol

FZN Analytics · settled open interest, 20–21 Aug 2026 · XOP

XOP contracts outstanding by strike

Pale is Thursday’s open, solid is what the session added.

XOP contracts outstanding by strikeXOP contracts outstanding by strike. Pale is Thursday's open, solid is what the session added.spot $187.45240230190180+3.6k+3.6k175170+9.9k165160155150140130125← PUTSCALLS →
Thursday’s opensession added← putscalls →

FZN Analytics · settled open interest, 20–21 Aug 2026 · XOP

LUV · Southwest Airlines Co

3-day run after a quiet book

Last
$39.85 -3.8%
Sector
Industrials · Airlines, Airports & Air Services
Market cap
$20.26B
Earnings
28 Oct

Three-day run after a quiet book: 9.7k / 7.9k / 11k against a 3.7k median.

LUV open interest change by expiry

Change in open interest by expiry, 20 August. At-the-money implied vol, tape truncated, 13:30–19:59 UTC.

LUV open interest change by expiryChange in LUV open interest by expiry, calls against puts, with at-the-money implied volatility.01.0k2.0k3.0k48336118 Sep28d42152716 Oct56d94418 Dec119d1.9k15 Jan147d1.5k19 Mar210d1.5k17 Jun300d17 Sep392d21 Jan518d38%41%35%45%callsputsimplied vol

FZN Analytics · settled open interest, 20–21 Aug 2026 · LUV

LUV contracts outstanding by strike

Pale is Thursday’s open, solid is what the session added.

LUV contracts outstanding by strikeLUV contracts outstanding by strike. Pale is Thursday's open, solid is what the session added.spot $39.8580605552.55047.54542.540.54037.53027.5← PUTSCALLS →
Thursday’s opensession added← putscalls →

FZN Analytics · settled open interest, 20–21 Aug 2026 · LUV

MSTX · Daily Target 2X Long MSTR ETF

3-day run after a quiet book

Last
$11.12 +15.5%
Sector
Financial Services · Asset Management - Leveraged
Market cap
$30.3M
Earnings
—

Three-day run after a quiet book: 4.3k / 5.1k / 4.3k against a 1.6k median.

MSTX open interest change by expiry

Change in open interest by expiry, 20 August. At-the-money implied vol, tape truncated, 13:30–19:59 UTC.

MSTX open interest change by expiryChange in MSTX open interest by expiry, calls against puts, with at-the-money implied volatility.01.0k91341728 Aug7d42411 Sep21d49018 Sep28d18 Dec119d13315 Jan147d19 Mar210d21 Jan518d15 Dec847d159%147%172%callsputsimplied vol

FZN Analytics · settled open interest, 20–21 Aug 2026 · MSTX

MSTX contracts outstanding by strike

Pale is Thursday’s open, solid is what the session added.

MSTX contracts outstanding by strikeMSTX contracts outstanding by strike. Pale is Thursday's open, solid is what the session added.spot $11.1260553016151211.5+1.6k11+42410.5109843← PUTSCALLS →
Thursday’s opensession added← putscalls →

FZN Analytics · settled open interest, 20–21 Aug 2026 · MSTX

VIK · Viking Holdings Ltd

3-day run after a quiet book

Last
$90.59 -0.2%
Sector
Consumer Cyclical · Travel Services
Market cap
$40.32B
Earnings
18 Nov

Three-day run after a quiet book: 4.2k / 4.4k / 1.4k against a 609 median.

VIK open interest change by expiry

Change in open interest by expiry, 20 August. At-the-money implied vol, tape truncated, 13:30–19:59 UTC.

VIK open interest change by expiryChange in VIK open interest by expiry, calls against puts, with at-the-money implied volatility.01.0k23870918 Sep28d20 Nov91d35%38%32%41%callsputsimplied vol

FZN Analytics · settled open interest, 20–21 Aug 2026 · VIK

VIK contracts outstanding by strike

Pale is Thursday’s open, solid is what the session added.

VIK contracts outstanding by strikeVIK contracts outstanding by strike. Pale is Thursday's open, solid is what the session added.spot $90.59115110105100959085+59180706025← PUTSCALLS →
Thursday’s opensession added← putscalls →

FZN Analytics · settled open interest, 20–21 Aug 2026 · VIK

IEP · Icahn Enterprises L.P

3-day run after a quiet book

Last
$6.65 +0.0%
Sector
Energy · Oil & Gas Refining & Marketing
Market cap
$4.47B
Earnings
4 Nov

Three-day run after a quiet book: 7.7k / 4.1k / 2.5k against a 490 median.

IEP open interest change by expiry

Change in open interest by expiry, 20 August. At-the-money implied vol, tape truncated, 13:30–19:59 UTC.

IEP open interest change by expiryChange in IEP open interest by expiry, calls against puts, with at-the-money implied volatility.01.0k13318 Dec119d21558315 Jan147d19 Mar210d21 Jan518d71%65%77%callsputsimplied vol

FZN Analytics · settled open interest, 20–21 Aug 2026 · IEP

IEP contracts outstanding by strike

Pale is Thursday’s open, solid is what the session added.

IEP contracts outstanding by strikeIEP contracts outstanding by strike. Pale is Thursday's open, solid is what the session added.spot $6.65302017.5151412.51097.565← PUTSCALLS →
Thursday’s opensession added← putscalls →

FZN Analytics · settled open interest, 20–21 Aug 2026 · IEP

UTHR · United Therapeutics Corporation

3-day run after a quiet book

Last
$521.00 -1.5%
Sector
Healthcare · Biotechnology
Market cap
$22.46B
Earnings
4 Nov

Three-day run after a quiet book: 2.5k / 16k / 3.0k against a 484 median.

UTHR open interest change by expiry

Change in open interest by expiry, 20 August. At-the-money implied vol, tape truncated, 13:30–19:59 UTC.

UTHR open interest change by expiryChange in UTHR open interest by expiry, calls against puts, with at-the-money implied volatility.01.0k2.0k3.0k4.0k2.9k18 Sep28d37%34%40%callsputsimplied vol

FZN Analytics · settled open interest, 20–21 Aug 2026 · UTHR

UTHR contracts outstanding by strike

Pale is Thursday’s open, solid is what the session added.

UTHR contracts outstanding by strikeUTHR contracts outstanding by strike. Pale is Thursday's open, solid is what the session added.spot $521.00700680600+1.5k580570+1.5k550530500480460← PUTSCALLS →
Thursday’s opensession added← putscalls →

FZN Analytics · settled open interest, 20–21 Aug 2026 · UTHR

Q · Qnity Electronics, Inc

3-day run after a quiet book

Last
$133.50 +5.9%
Sector
Technology · Semiconductors
Market cap
$26.39B
Earnings
17 Nov

Three-day run after a quiet book: 8.3k / 3.2k / 1.3k against a 371 median.

Q open interest change by expiry

Change in open interest by expiry, 20 August. At-the-money implied vol, tape truncated, 13:30–19:57 UTC.

Q open interest change by expiryChange in Q open interest by expiry, calls against puts, with at-the-money implied volatility.01.0k2.0k95718 Sep28d16 Oct56d54%50%59%callsputsimplied vol

FZN Analytics · settled open interest, 20–21 Aug 2026 · Q

Q contracts outstanding by strike

Pale is Thursday’s open, solid is what the session added.

Q contracts outstanding by strikeQ contracts outstanding by strike. Pale is Thursday's open, solid is what the session added.spot $133.50190170160155150145135130125115← PUTSCALLS →
Thursday’s opensession added← putscalls →

FZN Analytics · settled open interest, 20–21 Aug 2026 · Q

AMTX · Aemetis, Inc

3-day run after a quiet book

Last
$1.92 +3.2%
Sector
Basic Materials · Chemicals - Specialty
Market cap
$130.9M
Earnings
5 Nov

Three-day run after a quiet book: 984 / 581 / 248 against a 84 median.

AMTX open interest change by expiry

Change in open interest by expiry, 20 August.

AMTX open interest change by expiryChange in AMTX open interest by expiry, calls against puts.01.0k16 Oct56d15 Jan147d16 Apr238d21 Jan518dcallsputs

FZN Analytics · settled open interest, 20–21 Aug 2026 · AMTX

AMTX contracts outstanding by strike

Pale is Thursday’s open, solid is what the session added.

AMTX contracts outstanding by strikeAMTX contracts outstanding by strike. Pale is Thursday's open, solid is what the session added.spot $1.927.552.521.510.5← PUTSCALLS →
Thursday’s opensession added← putscalls →

FZN Analytics · settled open interest, 20–21 Aug 2026 · AMTX

ASTL · Algoma Steel Group Inc

3-day run after a quiet book

Last
$4.56 -4.8%
Sector
Basic Materials · Steel
Market cap
$504.8M
Earnings
4 Nov

Three-day run after a quiet book: 14k / 19k / 275 against a 26 median.

ASTL open interest change by expiry

Change in open interest by expiry, 20 August.

ASTL open interest change by expiryChange in ASTL open interest by expiry, calls against puts.01.0k24318 Sep28d20 Nov91dcallsputs

FZN Analytics · settled open interest, 20–21 Aug 2026 · ASTL

ASTL contracts outstanding by strike

Pale is Thursday’s open, solid is what the session added.

ASTL contracts outstanding by strikeASTL contracts outstanding by strike. Pale is Thursday's open, solid is what the session added.spot $4.5610987654321← PUTSCALLS →
Thursday’s opensession added← putscalls →

FZN Analytics · settled open interest, 20–21 Aug 2026 · ASTL

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