SPTS · State Street(R) SPDR(R) Portfolio Short Term Treasury ETF ETF

Alerts for SPTS

$28.85 +0.01 (+0.03%) At close · Sep 4

Options Chain

Underlying $28.85 · at close Sep 4, 2026 Options Calculator

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Positioning

Sep 18, 2026 · 11 days to expiry · 38 contracts · mixed daily-bar sessions · Aug 24, 2026; 37 unknown

Put / call OI

—

No open interest

Open interest

as of Sep 3, 2026

Volume

—

dated and unknown daily-bar sessions

Max pain

$29.00

$0.15 above spot

ATM implied vol

40.7%

market's expected move

Open interest by strike

Calls Puts

Chain

Click any strike for greeks, breakeven and the calculator

Expiry

Sep 18 11d Oct 16 39d Nov 20 74d Feb 19 165d

Calls								Puts
OI	Vol	IV	Δ	Bid	Ask	Last	Strike	Last	Bid	Ask	Δ	IV	Vol	OI
—	—	—	—	$7.30	$10.40	—		—	$0.00	$0.10	—	—	—	—
Call · $20 In the money Daily-bar session Unknown Quote as of 2026-09-04 19:56:41.620 UTC Last — Breakeven — Implied vol — Delta — Gamma — Theta — Vega — Open interest — OI effective date — Model this call Put · $20 Daily-bar session Unknown Quote as of 2026-09-04 19:55:04.850 UTC Last — Breakeven — Implied vol — Delta — Gamma — Theta — Vega — Open interest — OI effective date — Model this put
—	—	—	—	$6.30	$9.40	—		—	$0.00	$0.10	—	—	—	—
Call · $21 In the money Daily-bar session Unknown Quote as of 2026-09-04 19:58:43.848 UTC Last — Breakeven — Implied vol — Delta — Gamma — Theta — Vega — Open interest — OI effective date — Model this call Put · $21 Daily-bar session Unknown Quote as of 2026-09-04 19:55:04.850 UTC Last — Breakeven — Implied vol — Delta — Gamma — Theta — Vega — Open interest — OI effective date — Model this put
—	—	—	—	$5.30	$8.40	—		—	$0.00	$0.10	—	—	—	—
Call · $22 In the money Daily-bar session Unknown Quote as of 2026-09-04 19:55:13.005 UTC Last — Breakeven — Implied vol — Delta — Gamma — Theta — Vega — Open interest — OI effective date — Model this call Put · $22 Daily-bar session Unknown Quote as of 2026-09-04 19:55:04.850 UTC Last — Breakeven — Implied vol — Delta — Gamma — Theta — Vega — Open interest — OI effective date — Model this put
—	—	—	—	$4.30	$7.40	—		—	$0.00	$0.10	—	—	—	—
Call · $23 In the money Daily-bar session Unknown Quote as of 2026-09-04 19:59:00.184 UTC Last — Breakeven — Implied vol — Delta — Gamma — Theta — Vega — Open interest — OI effective date — Model this call Put · $23 Daily-bar session Unknown Quote as of 2026-09-04 19:55:01.057 UTC Last — Breakeven — Implied vol — Delta — Gamma — Theta — Vega — Open interest — OI effective date — Model this put
—	—	—	—	$3.30	$6.40	—		—	$0.00	$0.10	—	—	—	—
Call · $24 In the money Daily-bar session Unknown Quote as of 2026-09-04 19:58:39.408 UTC Last — Breakeven — Implied vol — Delta — Gamma — Theta — Vega — Open interest — OI effective date — Model this call Put · $24 Daily-bar session Unknown Quote as of 2026-09-04 19:57:01.550 UTC Last — Breakeven — Implied vol — Delta — Gamma — Theta — Vega — Open interest — OI effective date — Model this put
—	—	—	—	$2.35	$5.40	—		—	$0.00	$0.10	—	—	—	—
Call · $25 In the money Daily-bar session Unknown Quote as of 2026-09-04 19:59:41.222 UTC Last — Breakeven — Implied vol — Delta — Gamma — Theta — Vega — Open interest — OI effective date — Model this call Put · $25 Daily-bar session Unknown Quote as of 2026-09-04 19:55:01.057 UTC Last — Breakeven — Implied vol — Delta — Gamma — Theta — Vega — Open interest — OI effective date — Model this put
—	—	—	—	$1.35	$4.40	—		—	$0.00	$0.10	—	—	—	—
Call · $26 In the money Daily-bar session Unknown Quote as of 2026-09-04 19:57:52.364 UTC Last — Breakeven — Implied vol — Delta — Gamma — Theta — Vega — Open interest — OI effective date — Model this call Put · $26 Daily-bar session Unknown Quote as of 2026-09-04 19:57:01.225 UTC Last — Breakeven — Implied vol — Delta — Gamma — Theta — Vega — Open interest — OI effective date — Model this put
—	—	—	—	$0.35	$3.40	—		—	$0.00	$0.10	—	—	—	—
Call · $27 In the money Daily-bar session Unknown Quote as of 2026-09-04 19:59:23.867 UTC Last — Breakeven — Implied vol — Delta — Gamma — Theta — Vega — Open interest — OI effective date — Model this call Put · $27 Daily-bar session Unknown Quote as of 2026-09-04 19:55:01.057 UTC Last — Breakeven — Implied vol — Delta — Gamma — Theta — Vega — Open interest — OI effective date — Model this put
—	—	—	—	$0.00	$2.40	—		—	$0.00	$0.10	—	—	—	—
Call · $28 In the money Daily-bar session Unknown Quote as of 2026-09-04 19:59:32.020 UTC Last — Breakeven — Implied vol — Delta — Gamma — Theta — Vega — Open interest — OI effective date — Model this call Put · $28 Daily-bar session Unknown Quote as of 2026-09-04 19:55:29.720 UTC Last — Breakeven — Implied vol — Delta — Gamma — Theta — Vega — Open interest — OI effective date — Model this put
Underlying $28.85
—	—	—	—	$0.00	$0.10	—		$0.10	$0.05	$1.70	-0.509	40.7%	1	1
Call · $29 Daily-bar session Unknown Quote as of 2026-09-04 19:59:31.884 UTC Last — Breakeven — Implied vol — Delta — Gamma — Theta — Vega — Open interest — OI effective date — Model this call Put · $29 In the money Daily-bar session Aug 24, 2026 Quote as of 2026-09-04 19:58:07.262 UTC Last $0.10 Breakeven $28.90 Implied vol 40.7% Delta -0.509 ≈51% ITM Gamma 0.196 Theta -0.035 Vega 0.02 Open interest 1 OI effective date Sep 3, 2026 Model this put
—	—	—	—	$0.00	$0.10	—		—	$0.00	$2.70	—	—	—	—
Call · $30 Daily-bar session Unknown Quote as of 2026-09-04 19:57:01.224 UTC Last — Breakeven — Implied vol — Delta — Gamma — Theta — Vega — Open interest — OI effective date — Model this call Put · $30 In the money Daily-bar session Unknown Quote as of 2026-09-04 19:59:32.096 UTC Last — Breakeven — Implied vol — Delta — Gamma — Theta — Vega — Open interest — OI effective date — Model this put
—	—	—	—	$0.00	$0.10	—		—	$0.65	$3.70	-0.912	29.6%	—	—
Call · $31 Daily-bar session Unknown Quote as of 2026-09-04 19:57:01.225 UTC Last — Breakeven — Implied vol — Delta — Gamma — Theta — Vega — Open interest — OI effective date — Model this call Put · $31 In the money Daily-bar session Unknown Quote as of 2026-09-04 19:59:57.354 UTC Last — Breakeven — Implied vol 29.6% Delta -0.912 ≈91% ITM Gamma 0.108 Theta -0.008 Vega 0.008 Open interest — OI effective date — Model this put
—	—	—	—	$0.00	$0.10	—		—	$1.65	$4.70	-0.929	39.3%	—	—
Call · $32 Daily-bar session Unknown Quote as of 2026-09-04 19:57:01.226 UTC Last — Breakeven — Implied vol — Delta — Gamma — Theta — Vega — Open interest — OI effective date — Model this call Put · $32 In the money Daily-bar session Unknown Quote as of 2026-09-04 19:59:23.014 UTC Last — Breakeven — Implied vol 39.3% Delta -0.929 ≈93% ITM Gamma 0.069 Theta -0.009 Vega 0.007 Open interest — OI effective date — Model this put
—	—	—	—	$0.00	$0.10	—		—	$2.65	$5.70	-0.939	48.3%	—	—
Call · $33 Daily-bar session Unknown Quote as of 2026-09-04 19:57:01.226 UTC Last — Breakeven — Implied vol — Delta — Gamma — Theta — Vega — Open interest — OI effective date — Model this call Put · $33 In the money Daily-bar session Unknown Quote as of 2026-09-04 19:59:45.851 UTC Last — Breakeven — Implied vol 48.3% Delta -0.939 ≈94% ITM Gamma 0.05 Theta -0.01 Vega 0.006 Open interest — OI effective date — Model this put
—	—	—	—	$0.00	$0.10	—		—	$3.60	$6.70	-0.963	51.5%	—	—
Call · $34 Daily-bar session Unknown Quote as of 2026-09-04 19:57:01.227 UTC Last — Breakeven — Implied vol — Delta — Gamma — Theta — Vega — Open interest — OI effective date — Model this call Put · $34 In the money Daily-bar session Unknown Quote as of 2026-09-04 19:57:49.978 UTC Last — Breakeven — Implied vol 51.5% Delta -0.963 ≈96% ITM Gamma 0.032 Theta -0.006 Vega 0.004 Open interest — OI effective date — Model this put
—	—	—	—	$0.00	$0.10	—		—	$4.60	$7.70	-0.966	59.1%	—	—
Call · $35 Daily-bar session Unknown Quote as of 2026-09-04 19:57:01.228 UTC Last — Breakeven — Implied vol — Delta — Gamma — Theta — Vega — Open interest — OI effective date — Model this call Put · $35 In the money Daily-bar session Unknown Quote as of 2026-09-04 19:59:24.733 UTC Last — Breakeven — Implied vol 59.1% Delta -0.966 ≈97% ITM Gamma 0.026 Theta -0.007 Vega 0.004 Open interest — OI effective date — Model this put
—	—	—	—	$0.00	$0.10	—		—	$5.60	$8.70	-0.968	66.4%	—	—
Call · $36 Daily-bar session Unknown Quote as of 2026-09-04 19:57:01.575 UTC Last — Breakeven — Implied vol — Delta — Gamma — Theta — Vega — Open interest — OI effective date — Model this call Put · $36 In the money Daily-bar session Unknown Quote as of 2026-09-04 19:58:51.544 UTC Last — Breakeven — Implied vol 66.4% Delta -0.968 ≈97% ITM Gamma 0.022 Theta -0.007 Vega 0.004 Open interest — OI effective date — Model this put
—	—	—	—	$0.00	$0.10	—		—	$6.60	$9.70	-0.97	73.3%	—	—
Call · $37 Daily-bar session Unknown Quote as of 2026-09-04 19:57:01.605 UTC Last — Breakeven — Implied vol — Delta — Gamma — Theta — Vega — Open interest — OI effective date — Model this call Put · $37 In the money Daily-bar session Unknown Quote as of 2026-09-04 19:58:44.410 UTC Last — Breakeven — Implied vol 73.3% Delta -0.97 ≈97% ITM Gamma 0.019 Theta -0.008 Vega 0.003 Open interest — OI effective date — Model this put
—	—	—	—	$0.00	$0.10	—		—	$7.60	$10.70	-0.972	80.1%	—	—
Call · $38 Daily-bar session Unknown Quote as of 2026-09-04 19:59:49.424 UTC Last — Breakeven — Implied vol — Delta — Gamma — Theta — Vega — Open interest — OI effective date — Model this call Put · $38 In the money Daily-bar session Unknown Quote as of 2026-09-04 19:58:14.654 UTC Last — Breakeven — Implied vol 80.1% Delta -0.972 ≈97% ITM Gamma 0.016 Theta -0.008 Vega 0.003 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 · Aug 24, 2026; 37 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.