Stream Option Theta
Streams the real-time theta Greek for options contracts. Theta measures the rate of time decay - how much value an option loses each day, all else being equal.
Symbol Format
Options use OCC (Options Clearing Corporation) format:
- Format:
SYMBOL + YYMMDD + C/P + Strike(8 digits) - Example:
AAPL240315C00170000= AAPL Call, Mar 15 2024, Strike $170
Theta Characteristics
| Scenario | Theta Behavior |
|---|---|
| At-the-money | Highest theta |
| Near expiration | Theta accelerates |
| Long-dated | Lower theta |
| Deep ITM/OTM | Lower theta |
Notes
- Data streams automatically update in Excel
- Theta is typically negative (options lose value over time)
- Represents daily decay (weekends count too)
Syntax
=QM_Stream_Theta(Symbol)Parameters
Option symbol in OCC format
Returns
Option theta value (typically negative)
Examples
=QM_Stream_Theta("AAPL240315C00170000")=QM_Stream_Theta("MSFT240315P00400000")=QM_Stream_Theta(A1)=QM_Stream_Theta("AAPL240315C00170000")*7When to Use
- Time decay analysis
- Option selling strategies
- Position sizing for theta harvest
- Understanding holding costs
When NOT to Use
| Scenario | Use Instead |
|---|---|
| Need delta | QM_Stream_Delta() |
| Need gamma | QM_Stream_Gamma() |
| Need vega | QM_Stream_Vega() |
| Need implied volatility | QM_Stream_ImpliedVolatality() |
Common Issues & FAQ
Why is theta negative?
Options are wasting assets - they lose value as time passes. Negative theta reflects this decay.
When does theta decay fastest?
Theta accelerates as expiration approaches, especially for at-the-money options in the final weeks.
Excel Templates Using Stream Option Theta
These ready-made MarketXLS templates call QM_Stream_Theta() in their worksheet formulas. Open one to see the function working inside a complete model.
- Options Rollover Strategy Example Template
- Template for Accessing Real-Time Data on US Stock Option Bids, Greeks, Open Interest, and Unusual Op
- ^SPX Real time Option Chain with SPXW
- Option Chain Excel Sheet (SPY Example)
- Poor Man's Covered Call (PMCC) - Advanced Options Income Strategy with Real-Time Greeks & Analytics
Related Formulas
More MarketXLS Price Quotes (Streaming) formulas you can use in the same worksheet:
- Stream Option Volatility Change
- Stream Percentage Change
- Stream Percentage Change
- Stream Post Market Change
- Stream Post Market Change
- Stream Post Market Last
- Stream Post Market Last Price
- Stream Post Market Last Trade Time
See QM_Stream_Theta used in a complete workbook: Diagonal Spread: Complete Options Strategy Guide with Excel Setup
Get Access to 1 Billion Usable Market data points IN YOUR EXCEL SHEETS WITH EASY TO USE EXCEL FUNCTIONS
Get started today