Which Novo Nordisk ticker is most tax efficient in a UK SIPP?
What I ended up doing was finding where each ticker of Novo was registered (what exchange), then individually looking up the foreign taxation rules of the containing country.  Luckily, most companies only have a few tickers so this wasn't too hard in the end.
"The official source is the most recent Form 13F that Berkshire Hathaway, which is  filed with the Securities & Exchange Commission on a quarterly basis .  You can find it through the SEC filing search engine, using BRKA as the ticker symbol. and then looking for the filings marked 13-FR or 13-FR/A (the ""/A"" indicates an amended filing).   As you can see by looking at the 13-F filed for the quarter ending September 30  , the document isn't pretty or necessarily easy to read, hence the popularity of sites such as those that Chad linked to. It is, though, the truly official source from which websites tracking the Berkshire Hathaway portfolio derive their information." This question is indeed rather complicated. Let's simplify it a little bit. Paying down your mortgage makes sense if your expected return in the rest of your portfolio is less than the cost of the mortgage. In many cases, people may also decide to pay down their mortgage because they are risk-averse and do not like carrying debt. There's no tax benefit to doing so, though; Canada doesn't generally allow you to write off mortgage interest, unlike the U.S. As to keeping money in the corporation or not, I'm not going to address that. I don't have a firm enough understanding of corporate taxation. Canadian Couch Potato advises treating all of your investment assets as one large portfolio. That is what you are trying to do here. However, let's consider a different approach. If you do not have enough money to max out your RRSP or TFSA, you may choose to keep your TFSA for an emergency fund, where the money is kept highly liquid. Keep your cash in an interest-bearing TFSA, or perhaps invest it in the money market, inside your TFSA. Then, use your RRSP for the rest of your investment money, split according to your investment goals. This is not the most tax-efficient approach, but it is nice and simple. But you are looking for the most tax-efficient approach. So, let's assume you have enough to more than max out your TFSA and RRSP contributions, and all of your investments are going toward your retirement, which is at least a decade away. Because you are not taxed on your investment income from RRSPs (until you withdraw the money) or TFSA, it makes sense to hold the least tax-efficient investments there. Tax-advantaged investments such as Canadian equities should be held in your investment accounts outside of TFSA and RRSPs. Again, the Canadian Couch Potato has a great article on where to put your investment assets. That article covers interest, dividends, foreign dividends, and capital gains, as well as RRSPs, RESPs, and TFSAs. That article recommends holding Canadian equities in a taxable account, REITs in a tax-sheltered account (TFSA or RRSP), bonds, GICs, and money-market funds in a tax-sheltered account (as these count as interest). The article goes into rather more detail than this, and is worth checking out. It mentions the 15% withholding tax on US-listed ETFs, for example. In addition to that website, I recommend the following three books: The above three resources strongly advocate passive indexed investments, which I like but not everyone agrees with. All three specifically discuss tax implications, which is why I include them here. Algorithmic trading essentially banks on the fact that a price will fluctuate in tiny amounts over short periods of time, meaning the volatility is high in that given time frame. As the time frame increases the efficiency of algorithmic trading decreases and proper investment strategies such as due diligence, stock screening, and technical analysis become the more efficient methods.  Algorithms become less effective as the time frame increases due to the smoothing effect of volatility over time. Writing an algorithm that could predict future long-term prices would be an impossible feat because as the time frame is scaled up there are far less price fluctuations and trends (volatility smooths out) and so there is little to no benchmark for the formulas.  An algorithm simply wouldn't make sense for a long-term position. A computer can't predict, say, the next quarter, an ousted CEO, a buyout, or anything else that could effect the price of the security, never mind the psychology behind it all. Vice versa, researching a company's fundamentals just to bank on a 0.25% daily swing would not be efficient. Tax advantages or not, it is the most efficient methods that are preferred for a given time-scale of trading. Yes, You will have to pay the taxes at least initially but you'll most probably get a refund when you will file returns depending upon the amount and tax brackets in the UK. For 2014/15 it looks something like this:  To make it a bit clearer, let's also plot the difference in net income for self-employment and a single person company compared to employment:  Self-employment is slightly worse between £5885 and about £10,500 because Class 2 NI kicks in before the employed person starts paying any tax. After that, self-employment is better because you pay 9% Class 4 NI rather than 12% Class 1 NI. Once higher rate tax kicks in, the saving stops growing. The single-person company is most tax-efficient at all points, ignoring any accountancy costs it incurs. Strange things happen between £100k and about £135k because the withdrawal of the personal allowance kicks in at a different point when receiving dividends. We can also plot the percentage of income paid as tax for each case:  The strange kink for self-employment below £10k is caused by Class 2 NI again. Employment and self-employment both gradually tend towards paying 47%, reaching 46.5% for £2m gross income. The company tends towards 44.44%, reaching 43.6% for £2m gross income. "Interactive Brokers offers global securities trading. Notice that the security types are: cash, stock (STK), futures (FUT), options (OPT), futures options   (FOP), warrants (WAR), bonds, contracts for differences (CFD), or   Dutch warrants (IOPT) There is a distinction between options (OPT), warrants (WAR), options on futures (FOP) and finally, Dutch Warrants (IOPT). IOPT is intuitively similar to an ""index option"". (For index option valuation equations, iopt=1 for a call, and iopt= -1 for a put. I don't know if Interactive Brokers uses that convention).  What is the difference between a ""Dutch Warrant"" and an option or warrant? Dutch warrants aren't analogous to Dutch auctions e.g. in the U.S.Treasury bond market. For North America, Interactive Brokers only lists commissions for traditional warrants and options, that is, warrants and options that have a single stock as the underlying security. For Asia and Europe, Interactive Brokers lists both the  ""regular"" options (and warrants) as well as ""equity index options"", see commission schedule. Dutch warrants are actually more like options than warrants, and that may be why Interactive Brokers refers to them as IOPTS (index options). Here's some background from a research article about Dutch warrants (which was NOT easy to find): In the Netherlands, ING Bank introduced call and put warrants on the   FT-SE 100, the CAC 40 and the German DAX indexes. These are some differences between [Dutch] index warrants and exchange traded index options: That last point is the most important, as it makes the pricing and valuation less subject to arbitrage. Last part of the question: Where do you find Structured Products on Interactive Brokers website? Look on the Products page (rather than the Commissions page, which does't mention Structured Products at all). There is a Structured Products tab with details." moneydashboard.com  claims to be the UK's Mint but I have problem using it with my HSBC account right now. I have contacted their helpdesk. I use two different brokerages, both well-known. I got a bit spooked during the financial crisis and didn't want to have all my eggs in one basket. The SIPC limits weren't so much a factor. At the time, I was more worried about the hassle of dealing with a Lehman-style meltdown. If one were to fail, the misery of waiting and filing and dealing with SIPC claims would be mitigated by having half of my money in another brokerage. In hindsight, I was perhaps a bit too paranoid. Dealing with two separate brokerages is not much of an inconvenience, though, and it's interesting to see how their web interfaces are slightly different and some things are easier to do with one vs the other. Overall, they're really similar and I can't say there's much advantage (other than my tin-foil hat tendencies) to splitting it up like that.