So for looking at the short interest in TSLA (or any other stock for that matter), is this really the only way to do it? Tesla Motors, Inc. (TSLA) Short Interest - NASDAQ.com It's only updated twice a month. I am surprised that there is not more fine grained reporting available. Can some of the investment gurus speak to this? Is this simply due to a lack of demand for this type of information, so NASDAQ hasn't bothered to put the infrastructure and rules in place that would enable something like daily reporting? Is there some technical or regulatory reason why we can't have better data? Or some practical consideration? As you can see, the short interest has been declining and daily volume has been shooting up. However, I was wondering if the short interest might be ticking up again as TSLA continues to push all time highs. Also, another question, over what time period is Average Daily Volume calculated? Is there a standard across the industry? For instance, in this case, on this NASDAQ shorts page, am I to assume that the average daily volume is calculated over the roughly two week period between the last update? That would make sense I guess. On this <a href="http://investing.money.msn.com/investments/stock-price?Symbol=tsla&ocid=qbeb" target="_blank">MSN Money page</a>, the average daily volume is specified to be over a 13 week period (10.04 million). However, I also have an MSN Money stock ticker thing on my phone, and it says the average daily volume for TSLA is 9.44 million, a difference that is significant enough to make me think that it is calculated over some time period different than 13 weeks. Is there some kind of standard for this?