Where can I find recent information about which major shareholders changed their positions in a given stock?
For the united States forms must be submitted electronically with the Securities and Exchange Commission , they also must be posted to company websites.
I don't see it in any of the exchange feeds I've gone through, including the SIPs. Not sure if there's something wrong with Nasdaq Last Sale (I don't have that feed) but it should be putting out the exact same data as ITCH. http://www.euroinvestor.com/exchanges/nasdaq/macromedia-inc/41408/history will work as DumbCoder states, but didn't contain LEHMQ (Lehman Brother's holding company). You can use Yahoo for companies that have declared bankruptcy, such as Lehman Brothers: http://finance.yahoo.com/q/hp?s=LEHMQ&a=08&b=01&c=2008&d=08&e=30&f=2008&g=d but you have to know the symbol of the holding company. The reason for such differences is that there's no source to get this information. The companies do not (and cannot) report who are their shareholders except for large shareholders and stakes of interest. These, in the case of GoPro, were identified during the IPO (you can look the filings up on EDGAR). You can get information from this or that publicly traded mutual fund about their larger holdings from their reports, but private investors don't provide even that. Institutional (public) investors buy and sell shares all the time and only report large investments. So there's no reliable way to get a snapshot picture you're looking for. "What in the world to shareholders have to do with it?  Nowadays, the vast majority of the shares in most big corporations are ""owned"" via intermediaries (i.e. mutual funds and 401K's, IRA's and Pension Funds) that do not ALLOW the actual end owners to have any say whatsoever.  All those investment vehicles *allow* people to care about ... is the share price." You could try asking Merrill Lynch, (general inquiries) :- http://www.ml.com/index.asp?id=7695_114042 So far I only found a few graphics :-    http://topics.nytimes.com/top/news/business/companies/merrill_lynch_and_company/ http://www.reuters.com/article/2008/01/17/us-merrilllynch-results-idUSWNAS674520080117 http://www.stocktradingtogo.com/2008/09/15/merrill-lynch-saved-by-bank-of-america-buyout/ "There are several such ""lists."" The one that is maintained by the company is called the shareholder registry. That is a list that the company has given to it by the brokerage firms. It is a start, but not a full list, because many individual shareholders hold their stock with say Merrill Lynch, in ""street name"" or anonymously. A more useful list is the one of institutional ownership maintained by the SEC. Basically, ""large"" holders (of more than 5 percent of the stock) have to register their holdings with the SEC. More to the point, large holders of stocks, the Vanguards, Fidelitys, etc. over a certain size, have to file ALL their holdings of stock with the SEC. These are the people you want to contact if you want to start a proxy fight. The most comprehensive list is held by the Depositary Trust Company. People try to get that list only in rare instances." The big websites, Yahoo and the like, only give the 10 biggest positions of any fund. Download the annual report of the fund, go to page 18, you will find the positions on the 31st of December.  However the actual positions could be different. The same applies to all funds. You need the annual report. They have been changing over Immelts tenor. Didn't know he was stepping down though.       Share buybacks can be for a variety of reasons. They feel stock price is undervalued, they want to support their current shareholders, debt is cheap so they can change their wacc, they prefer to return capital in a way that does not increase expected dividends in the future (something about dividends being sticky, and the a cut in dividends Make it look like company is doing bad), etc. "I'm searching for a master's thesis topic in equity investment or portfolio management and I'd be grateful if someone could tell me what are the hot ""trends"" going on right now on the market? Any new phenomenons (like the rise of blockchain, etf... but more relate to the equity side) or debates ( the use of the traditional techniques such as Beta to calculate WACC for example ...) ?" News about a company is not the only thing that affects its stock's price. There is also supply and demand.  That, of course, is influenced by news, but it is not the only actor.  An insider, with a large position in their company's stock, may want to diversify his overall portfolio and thus need to sell a large amount of stock.  That may be significant enough to increase supply and likely reduce the stock's price somewhat. That brings me to another influence on stock price: perception.  Executives, and other insiders with large positions in their company's stock, have to be careful about how and when they sell some of that stock as to not worry the markets.  Many investors watch insider selling to gauge the health of the company. Which brings me to another important point.  There are many things that may be considered news which is material to a certain company and its stock.  It is not just quarterly filings, earnings reports and such.  There is also news related to competitors, news about the economy or a certain sector, news about some weather event that affects a major supplier, news about a major earthquake that will impact the economy of a nation which can then have knock-on effects to other economies, etc... There are also a lot of investors with varying needs which will influence supply and demand.  An institutional investor, needing to diversify, may reduce their position in a stock and thus increase supply enough that it impacts the stock's price.  Meanwhile, individual investors will make their transactions at varying times during the day.  In the aggregate, that may have significant impacts on supply and demand. The overall point being that there are a lot of inputs and a lot of actors in a complicated system.  Even if you focus just on news, there are many things that fall into that category. News does not come out at regular intervals and it does not necessarily spread evenly.  That alone could make for a highly variable environment. "I only follow the news of stocks I already own.  I use the GlobeInvest Watchlist  http://www.theglobeandmail.com/globe-investor/my-watchlist/ each Friday night.    In the drop-down views choose ALL NEWS I believe that there is a strong ""grass is greaner .."" effect from always looking at what other stock are doing - leading to switching just before your first stock takes off. It is only when I sell some position that I go looking at other possibilities." "Though you're looking to repeat this review with multiple securities and events at different times, I've taken liberty in assuming you are not looking to conduct backtests with hundreds of events.  I've answered below assuming it's an ad hoc review for a single event pertaining to one security. Had the event occurred more recently, your full-service broker could often get it for you for free.  Even some discount brokers will offer it so.  If the stock and its options were actively traded, you can request ""time and sales,"" or ""TNS,"" data for the dates you have in mind.  If not active, then request ""time and quotes,"" or ""TNQ"" data. If the event happened long ago, as seems to be the case, then your choices become much more limited and possibly costly.  Below are some suggestions: Wall Street Journal and Investors' Business Daily print copies have daily stock options trading data.  They are best for trading data on actively traded options.  Since the event sounds like it was a major one for the company, it may have been actively traded that day and hence reported in the papers' listings.  Some of the print pages have been digitized; otherwise you'll need to review the archived printed copies. Bloomberg has these data and access to them will depend on whether the account you use has that particular subscription.  I've used it to get detailed equity trading data on defunct and delisted companies on specific dates and times and for and futures trading data.  If you don't have personal access to Bloomberg, as many do not, you can try to request access from a public, commercial or business school library. The stock options exchanges sell their data; some strictly to resellers and others to anyone willing to pay.  If you know which exchange(s) the options traded on, you can contact the exchange's market data services department and request TNS and / or TNQ data and a list of resellers, as the resellers may be cheaper for single queries." "The list of the public companies is available on the regulatory agencies' sites usually (for example, in the US, you can look at SEC filings). Otherwise, you can check the stock exchange listings, which show all the public companies traded on that exchange. The shareholders, on the other hand, are normally not listed and not published. You'll have to ask the company, and it probably won't tell you (and won't even know them all as many shares are held in the ""street name"" of the broker)." The methodology for divisor changes is based on splits and composition changes. Dividends are ignored by the index. Side note - this is why, in my opinion, that any discussion of the Dow's change over a long term becomes meaningless. Ignoring even a 2% per year dividend has a significant impact over many decades.  The divisor can be found at http://wsj.com/mdc/public/page/2_3022-djiahourly.html "When you look at those results you'll see that it lists the actual market cap for the stocks.  The ones on the biggest price move are usually close the the $1B capitalization cut-off that they use. (The don't report anything with less than $1B in capitalization on these lists.)  The ones on the biggest market cap are much larger companies. So, the answer is that a 40% change in price on a company that has $1B capitalization will be a $400M change in market cap.  A 4% change on a company with $100B capitalization will be a $4B change in market cap.  The one that moved 40% will make the ""price"" list but not the market cap list and vice versa."