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jharmon: IMO: My issue is not specifically that the exchange is reporting "it" wrong, but a nearly useless value with update intervals preventing it to be useful unless market is currently open. The value updates each trading day at undisclosed times. This means Friday's update relates to...

Mian97: Ask 100 people and get over 100 different answers! Options, unlike equities, add additional dimensions to trading. While you may use options merely as leverage to implement strategies similar to directional trading of equities, the least complex option trading in my opinion. You may...

Mian97: Use the TDA papermoney before making any trades. There are many moving parts with option trading. The most complex part, is likely you trying to understand exactly what you are trying to accomplish! (I am NOT trying to be an @$$ here, but most people enter a trade without a plan) --...

FYI: In the past, I used TOS ThinkBack, OnDemand, and normal mode using ThinkScripts in search of usable (reliable) backtesting of options. I found that the quality and reliability of the information was varying, making it very frustrating to use, as I would put a good deal of effort then find...

I would like to understand why the data reported as "PREV CLOSE" via NYSE (probably also other sources) is invalid over the weekends. One would think this would contain the value from the Closing price of the previous Trading day, regardless of the date you reference it. Note: Service providers...

Can you clarify what you mean by "... in backtester"? Are you writing your own ThinkScripts for your backtesting? Are you using ThinkBack, OnDemand, or normal mode? -- I have some experience with TOS and don't recall that issue, unless dealing with illiquid products. I do have OptionVue. I...

IGNORE my LAST POST! Chart was "yesterday"!

FYI: The option volume reported by TOS in the Option Chains seems to inaccurate. I have a position as shown in the clip below, which indicates Volume is zero. However, the Chart for THAT option, indicates a 84 trades have occurred. Interesting!!!

If you find useful information on accuracy of option volume, please post. If we find data (option volume) varying broker to broker, it seems prudent to follow-up to find out why, so we understand why. Incorrect data (option volume) from free services such as Yahoo and Google, would not...

K. I see that now! I just pulled up TOS and get a different set of numbers for option volume for that contract series. It is possible the data source for the different providers varies, so may be necessary to dig a little deeper for how the option volume for illiquid options such as those...

general comment: When posting something like this, it is helpful to provide a clue to what is giving you concern, if you really expect feedback. AKA what specific difference do you observe, and why does it give you concern? Note: the last prices are identical!

Hm! I seem to recall something similar when I was trading less liquid products/ETFs in the past. However, don't recall seeing this occur on SPX/RUT, which I now trade almost exclusively. I DO recall the experience (products I had positions in) was unpleasant. The issue being bids (maybe was...

marsman: Your statements make no sense! 1) I use TOS, who DOES provide Bid/Asked during and After market (after market is static, but present). If his broker does not provide the data as he stated, perhaps he may want to consider another broker. 2) Re-read the post "it's possible to check...

Who is your broker?

Looking a bit more closely at PUT Implied Volatility for some instruments, specifically focusing on SPX and RUT initially; there appear to be well behaved characteristics that I find interesting. The standard technique for determining the Implied Volatility of a specific option is to use a good...

Ah! Great!

I do NOT understand why you remain confused. Re-read what Open Interest is and how it is reported. Look at your own post above, where they (OCC) clearly state "Open interest figures are derived from ....". Unclear if overnight trading is even involved. Could be, but the numbers seem to...

Here are a few captures of the OI and Volume at market open and at market close. Note the OI at market open and market close remains unchanged. The OI is updated some time AFTER market close (I do not know if there is a precise time for the update). I hope this helps. (BTW: I am on Pacific...

marsman: look more closely. To satisfy your curiosity, examine the price at fixed times. For example you look prior to market open (good), but for your EOD, you have no timestamp. Look at prior to open on successive days to observe OI. Also, your data at the open is using the prior day's...

K-Pia is correct. The reported OI remains constant during the day and is updated after trading. Volume, should be as expected.