See list of stock trades for day
"You can see all the (millions) of trades per day for a US stock only if you purchase that data from the individual exchanges (NYSE, NASDAQ, ARCA, ...), from a commercial market data aggregator (Bloomberg, Axioma, ...), or from the Consolidated Tape Association.  In none of that data will you ever find identifying information for the traders. What you are recalling regarding the names of ""people from the company"" trading company stock is related to SEC regulations stating that people with significant ownership of company stock and/or controlling positions on the company board of directors must publicize (most of) their trades in that stock.  That information can usually be found on the company's investor relations website, or through the SEC website."
There is indeed a market for single stock futures, and they have been trading on the OneChicago exchange since 2002. Futures are available in 12,509 individual stocks, according to the exchange's current product listing. One advantage they offer over trading the underlying stock is the significantly higher leverage that is available, combined with the lack of pattern day trader rules that apply to stocks and similar securities. Single stock futures have proven to be something of a regulatory challenge as it has been unclear whether their oversight is the remit of the SEC/FINRA or the CFTC/NFA. "You can call CBOE and tell them you want that series or a particular contract. And this has nothing to do with FLEX. Tell them there is demand for it, if they ask who you are, DONT SAY YOU ARE A RETAIL INVESTOR, the contracts will be in the option chain the next day. I have done this plenty of times. The CBOE does not care and are only limited by OCC and the SEC, but the CBOE will trade and list anything if you can think of it, and convince them that ""some people want to trade it"" or that ""it has benefits for hedging"" I've gotten 50 cent strike prices on stocks under $5 , I've gotten additional LEAPS and far dated options traded, I've gotten entire large chains created. I also have been with prop shops before, so I could technically say I was a professional trader. But since you are using IB and are paying for data feeds, you can easily spin that too." At the bottom of the page you linked to, NASDAQ provides a link to this page on nasdaqtrader.com, which states Each FINRA member firm is required to report its “total” short interest positions in all customer and proprietary accounts in NASDAQ-listed securities twice a month. These reports are used to calculate short interest in NASDAQ stocks. FINRA member firms are required to report their short positions as of settlement on (1) the 15th of each month, or the preceding business day if the 15th is not a business day, and (2) as of settlement on the last business day of the month.* The reports must be filed by the second business day after the reporting settlement date. FINRA compiles the short interest data and provides it for publication on the 8th business day after the reporting settlement date. The dates you are seeing are the dates the member firms settled their trades. In general (also from nasdaq.com), the settlement date is The date on which payment is made to settle a trade. For stocks traded on US exchanges, settlement is currently three business days after the trade. "Sorry but you already provided the answer to your own question.  The simple answer is to 'not day trade' but hold things for a longer period and don't trade a large number of different stocks every week. Seriously, have a look at the rules and see what it implies.. an average of 20 buys and sells of longer term positions PER DAY is a pretty fair bit of trading, that's really churning through the positions compared to someone who might establish positions with say 25 well picked stocks and might change even 5 of those a week to a different stock.  Or even a larger number of stocks but seeking to hold them for over a year so you get taxed at the long term cap gains rate. If you want to day trade, be prepared to be labeled as such and deal with your broker on that basis.  Not like they will hate you given all the fees you are likely to rack up.  And the government will love you also, since you'll be paying short term gains taxes.  (and trust me, us bogelheads appreciate the liquidity the speculative and short term folks bring to the market.) In terms of how it would impact you, Expect to be required to have a fairly substantial balance ($25K) if you are maintaining a margin account. I'd suggest reading this thread My account's been labeled as ""day trader"" and I got a big margin call. What should I do? What trades can I place in the blocked period?" Previously, Google had a delayed update for their stock prices (15 minutes I believe). That change enabled users of Google Finance to see updates to stock prices in real-time. "My broker (thinkorswim) offers this from the platform's trade tab.  I believe this feature isn't crippled in the PaperMoney version which is effectively a ""free online service.""" Just got back from the office, so I can better answer it now. The trader uses the Metatrader platform, which is programmed with a language based off C++. I'm working with him to update some algos now. His strategies running on ToS are more or less proof-of-concept that he streams right now as he sources investors. This is just a shot in the dark but it could be intermarket data. If the stock is interlisted and traded on another market exchange that day then the Yahoo Finance data feed might have picked up the data from another market. You'd have to ask Yahoo to explain and they'd have to check their data.