VO · VANGUARD MID-CAP INDEX FUND ETF

Alerts for VO

$82.28 -0.17 (-0.21%) At close · Sep 4

Options Chain

Underlying $82.28 · at close Sep 4, 2026 Options Calculator

Positioning

Sep 18, 2026 · 13 days to expiry · 38 contracts · mixed daily-bar sessions · Jul 28, 2026–Sep 4, 2026; 20 unknown

Put / call OI

0.08

Call-heavy positioning

Open interest

917

as of Sep 3, 2026

Volume

—

dated and unknown daily-bar sessions

Max pain

$83.00

$0.72 above spot

ATM implied vol

13.3%

market's expected move

Open interest by strike

Calls Puts

Chain

Click any strike for greeks, breakeven and the calculator

Expiry

Sep 18 13d Oct 16 41d Jan 15 132d Apr 16 223d

Calls								Puts
OI	Vol	IV	Δ	Bid	Ask	Last	Strike	Last	Bid	Ask	Δ	IV	Vol	OI
—	—	—	—	$9.60	$12.50	—		—	$0.00	$0.25	—	—	—	—
Call · $71 In the money Daily-bar session Unknown Quote as of 2026-09-04 19:59:58.302 UTC Last — Breakeven — Implied vol — Delta — Gamma — Theta — Vega — Open interest — OI effective date — Model this call Put · $71 Daily-bar session Unknown Quote as of 2026-09-04 19:55:03.138 UTC Last — Breakeven — Implied vol — Delta — Gamma — Theta — Vega — Open interest — OI effective date — Model this put
—	—	51.2%	0.925	$9.30	$12.00	—		—	$0.00	$0.15	—	—	—	—
Call · $72 In the money Daily-bar session Unknown Quote as of 2026-09-04 19:59:58.302 UTC Last — Breakeven — Implied vol 51.2% Delta 0.925 ≈93% ITM Gamma 0.018 Theta -0.05 Vega 0.022 Open interest — OI effective date — Model this call Put · $72 Daily-bar session Unknown Quote as of 2026-09-04 19:59:59.587 UTC Last — Breakeven — Implied vol — Delta — Gamma — Theta — Vega — Open interest — OI effective date — Model this put
—	—	—	—	$7.60	$11.00	—		—	$0.00	$0.25	—	—	—	—
Call · $73 In the money Daily-bar session Unknown Quote as of 2026-09-04 19:59:58.302 UTC Last — Breakeven — Implied vol — Delta — Gamma — Theta — Vega — Open interest — OI effective date — Model this call Put · $73 Daily-bar session Unknown Quote as of 2026-09-04 19:59:59.587 UTC Last — Breakeven — Implied vol — Delta — Gamma — Theta — Vega — Open interest — OI effective date — Model this put
—	—	—	—	$6.80	$9.40	—		—	$0.00	$0.75	—	—	—	—
Call · $74 In the money Daily-bar session Unknown Quote as of 2026-09-04 19:59:58.311 UTC Last — Breakeven — Implied vol — Delta — Gamma — Theta — Vega — Open interest — OI effective date — Model this call Put · $74 Daily-bar session Unknown Quote as of 2026-09-04 19:59:59.586 UTC Last — Breakeven — Implied vol — Delta — Gamma — Theta — Vega — Open interest — OI effective date — Model this put
—	—	—	—	$5.60	$9.00	—		—	$0.00	$0.30	—	—	—	—
Call · $75 In the money Daily-bar session Unknown Quote as of 2026-09-04 19:59:58.311 UTC Last — Breakeven — Implied vol — Delta — Gamma — Theta — Vega — Open interest — OI effective date — Model this call Put · $75 Daily-bar session Unknown Quote as of 2026-09-04 19:59:59.587 UTC Last — Breakeven — Implied vol — Delta — Gamma — Theta — Vega — Open interest — OI effective date — Model this put
—	—	—	—	$4.70	$7.40	—		$0.35	$0.00	$0.30	—	—	20	20
Call · $76 In the money Daily-bar session Unknown Quote as of 2026-09-04 19:59:58.320 UTC Last — Breakeven — Implied vol — Delta — Gamma — Theta — Vega — Open interest — OI effective date — Model this call Put · $76 Daily-bar session Aug 27, 2026 Quote as of 2026-09-04 19:59:59.587 UTC Last $0.35 Breakeven $75.65 Implied vol — Delta — Gamma — Theta — Vega — Open interest 20 OI effective date Sep 3, 2026 Model this put
—	—	—	—	$4.50	$5.80	—		—	$0.00	$0.15	—	—	—	—
Call · $77 In the money Daily-bar session Unknown Quote as of 2026-09-04 19:59:59.586 UTC Last — Breakeven — Implied vol — Delta — Gamma — Theta — Vega — Open interest — OI effective date — Model this call Put · $77 Daily-bar session Unknown Quote as of 2026-09-04 19:59:59.573 UTC Last — Breakeven — Implied vol — Delta — Gamma — Theta — Vega — Open interest — OI effective date — Model this put
—	—	—	—	$3.50	$4.90	—		$0.27	$0.00	$0.55	—	—	1	1
Call · $78 In the money Daily-bar session Unknown Quote as of 2026-09-04 19:59:59.587 UTC Last — Breakeven — Implied vol — Delta — Gamma — Theta — Vega — Open interest — OI effective date — Model this call Put · $78 Daily-bar session Aug 25, 2026 Quote as of 2026-09-04 19:59:58.329 UTC Last $0.27 Breakeven $77.73 Implied vol — Delta — Gamma — Theta — Vega — Open interest 1 OI effective date Sep 3, 2026 Model this put
—	—	—	—	$2.50	$3.80	—		—	$0.00	$0.35	—	—	—	—
Call · $79 In the money Daily-bar session Unknown Quote as of 2026-09-04 19:59:59.587 UTC Last — Breakeven — Implied vol — Delta — Gamma — Theta — Vega — Open interest — OI effective date — Model this call Put · $79 Daily-bar session Unknown Quote as of 2026-09-04 19:55:01.356 UTC Last — Breakeven — Implied vol — Delta — Gamma — Theta — Vega — Open interest — OI effective date — Model this put
3	1	13.1%	0.885	$2.15	$2.85	$3.50		$0.40	$0.00	$0.25	—	—	1	1
Call · $80 In the money Daily-bar session Aug 21, 2026 Quote as of 2026-09-04 19:59:59.553 UTC Last $3.50 Breakeven $83.50 Implied vol 13.1% Delta 0.885 ≈88% ITM Gamma 0.095 Theta -0.022 Vega 0.03 Open interest 3 OI effective date Sep 3, 2026 Model this call Put · $80 Daily-bar session Sep 1, 2026 Quote as of 2026-09-04 19:59:59.628 UTC Last $0.40 Breakeven $79.60 Implied vol — Delta — Gamma — Theta — Vega — Open interest 1 OI effective date Sep 3, 2026 Model this put
—	—	10.8%	0.8	$1.05	$2.10	—		$0.25	$0.10	$0.30	-0.205	11.1%	1	3
Call · $81 In the money Daily-bar session Unknown Quote as of 2026-09-04 19:59:59.586 UTC Last — Breakeven — Implied vol 10.8% Delta 0.8 ≈80% ITM Gamma 0.167 Theta -0.025 Vega 0.044 Open interest — OI effective date — Model this call Put · $81 Daily-bar session Sep 4, 2026 Quote as of 2026-09-04 19:59:59.850 UTC Last $0.25 Breakeven $80.75 Implied vol 11.1% Delta -0.205 ≈20% ITM Gamma 0.165 Theta -0.017 Vega 0.044 Open interest 3 OI effective date Sep 3, 2026 Model this put
7	1	12.8%	0.582	$0.60	$1.40	$1.15		$0.66	$0.20	$1.15	-0.423	13.8%	1	3
Call · $82 In the money Daily-bar session Sep 4, 2026 Quote as of 2026-09-04 19:59:59.569 UTC Last $1.15 Breakeven $83.15 Implied vol 12.8% Delta 0.582 ≈58% ITM Gamma 0.196 Theta -0.035 Vega 0.061 Open interest 7 OI effective date Sep 3, 2026 Model this call Put · $82 Daily-bar session Aug 25, 2026 Quote as of 2026-09-04 19:59:59.553 UTC Last $0.66 Breakeven $81.34 Implied vol 13.8% Delta -0.423 ≈42% ITM Gamma 0.182 Theta -0.029 Vega 0.061 Open interest 3 OI effective date Sep 3, 2026 Model this put
Underlying $82.28
33	2	—	—	$0.00	$0.75	$0.50		$0.95	$0.75	$1.70	-0.604	14.2%	30	34
Call · $83 Daily-bar session Sep 3, 2026 Quote as of 2026-09-04 19:59:08.590 UTC Last $0.50 Breakeven $83.50 Implied vol — Delta — Gamma — Theta — Vega — Open interest 33 OI effective date Sep 3, 2026 Model this call Put · $83 In the money Daily-bar session Aug 18, 2026 Quote as of 2026-09-04 19:59:59.553 UTC Last $0.95 Breakeven $82.05 Implied vol 14.2% Delta -0.604 ≈60% ITM Gamma 0.174 Theta -0.028 Vega 0.06 Open interest 34 OI effective date Sep 3, 2026 Model this put
94	3	—	—	$0.00	$0.70	$0.62		—	$1.55	$2.50	-0.73	16.4%	—	—
Call · $84 Daily-bar session Aug 27, 2026 Quote as of 2026-09-04 19:59:58.345 UTC Last $0.62 Breakeven $84.62 Implied vol — Delta — Gamma — Theta — Vega — Open interest 94 OI effective date Sep 3, 2026 Model this call Put · $84 In the money Daily-bar session Unknown Quote as of 2026-09-04 19:59:59.586 UTC Last — Breakeven — Implied vol 16.4% Delta -0.73 ≈73% ITM Gamma 0.13 Theta -0.026 Vega 0.051 Open interest — OI effective date — Model this put
267	2	—	—	$0.00	$0.10	$0.10		$2.27	$2.50	$3.70	-0.76	22.8%	1	1
Call · $85 Daily-bar session Aug 31, 2026 Quote as of 2026-09-04 14:22:47.152 UTC Last $0.10 Breakeven $85.10 Implied vol — Delta — Gamma — Theta — Vega — Open interest 267 OI effective date Sep 3, 2026 Model this call Put · $85 In the money Daily-bar session Aug 25, 2026 Quote as of 2026-09-04 19:59:59.586 UTC Last $2.27 Breakeven $82.73 Implied vol 22.8% Delta -0.76 ≈76% ITM Gamma 0.088 Theta -0.036 Vega 0.048 Open interest 1 OI effective date Sep 3, 2026 Model this put
415	8	—	—	$0.00	$0.10	$0.16		$3.10	$3.30	$4.70	-0.812	25%	1	1
Call · $86 Daily-bar session Aug 26, 2026 Quote as of 2026-09-04 19:59:59.586 UTC Last $0.16 Breakeven $86.16 Implied vol — Delta — Gamma — Theta — Vega — Open interest 415 OI effective date Sep 3, 2026 Model this call Put · $86 In the money Daily-bar session Aug 21, 2026 Quote as of 2026-09-04 19:59:59.587 UTC Last $3.10 Breakeven $82.90 Implied vol 25% Delta -0.812 ≈81% ITM Gamma 0.069 Theta -0.033 Vega 0.042 Open interest 1 OI effective date Sep 3, 2026 Model this put
4	4	—	—	$0.00	$0.75	$0.01		—	$4.30	$5.70	-0.833	29.1%	—	—
Call · $87 Daily-bar session Aug 24, 2026 Quote as of 2026-09-04 19:59:59.587 UTC Last $0.01 Breakeven $87.01 Implied vol — Delta — Gamma — Theta — Vega — Open interest 4 OI effective date Sep 3, 2026 Model this call Put · $87 In the money Daily-bar session Unknown Quote as of 2026-09-04 19:59:59.587 UTC Last — Breakeven — Implied vol 29.1% Delta -0.833 ≈83% ITM Gamma 0.055 Theta -0.036 Vega 0.039 Open interest — OI effective date — Model this put
20	20	—	—	$0.00	$0.05	$0.04		—	$3.80	$6.80	—	—	—	—
Call · $88 Daily-bar session Aug 25, 2026 Quote as of 2026-09-04 13:31:08.463 UTC Last $0.04 Breakeven $88.04 Implied vol — Delta — Gamma — Theta — Vega — Open interest 20 OI effective date Sep 3, 2026 Model this call Put · $88 In the money Daily-bar session Unknown Quote as of 2026-09-04 19:59:59.587 UTC Last — Breakeven — Implied vol — Delta — Gamma — Theta — Vega — Open interest — OI effective date — Model this put
10	10	—	—	$0.00	$0.05	$0.05		$5.09	$4.80	$7.80	—	—	7	—
Call · $89 Daily-bar session Jul 28, 2026 Quote as of 2026-09-04 13:37:02.226 UTC Last $0.05 Breakeven $89.05 Implied vol — Delta — Gamma — Theta — Vega — Open interest 10 OI effective date Sep 3, 2026 Model this call Put · $89 In the money Daily-bar session Aug 18, 2026 Quote as of 2026-09-04 19:59:58.362 UTC Last $5.09 Breakeven $83.91 Implied vol — Delta — Gamma — Theta — Vega — Open interest — OI effective date — Model this put

About this data

Each contract's last price, day range and volume belong to the daily-bar session shown in its details; unknown means the source omitted that timestamp. Open interest has its own effective date shown separately; implied volatility and greeks are model values computed when fetched. This chain has mixed daily-bar sessions · Jul 28, 2026–Sep 4, 2026; 20 unknown. Positioning totals are shown only when every returned open-interest value has the same known effective date. Bid and ask are real-time consolidated OPRA readings.

In-the-money strikes are tinted, deepening toward the money, and the bar beside each open-interest figure scales to the heaviest strike shown. Max pain is the listed strike where the most open interest would expire worthless — a positioning reference, not a forecast.