How (or is it necessary) to rebalance a 401k with only one index fund?
"There's nothing to rebalance, the index fund rebalances itself to continue matching the index. However, you need to understand that such an investment is not diversified and you only invest in a very specific market, and very specific stocks on that market. S&P 500 is large (500 different companies, most of the time), but still not as broadly diversified as your retirement investment portfolio should be. You should talk to a financial adviser (CFP for example), many companies provide access to these for 401k plan participants. But in any case, I'd suggest considering ""target date"" funds - funds that are investing based on your expected retirement year, and become more conservative as you get closer to that year." Rebalance is across asset-classes which are mutually independent [like stocks and bonds; they may be inversely correlated at times as when stocks go down, bonds go up] 80%-20% (stock-bond) split is good for a young investor [say in 30s, some suggest 110-age as a good stock allocation percentage]. Here rebalance is done when say the asset-allocation(AA) strays away more than say 3 to 5% (again just a rule of thumb). E.g. if due to a recent run-up in stocks, AA could become 85%-15%. Then you sell stocks to buy bonds to make the AA 80%-20% And since this method always sells the winner -- you automatically make gains [selling high and buying low] S&P 500 index gives decent diversification within stocks; you want a total-bond-fund to take care of the bond side of your AA.
With regard to commodity futures, a paper released in January 2010 by Aulerich, Irwin, and Garcia, concluded that index funds have essentially no impact on commodity futures. Looking at stocks, a stock that gets included in a major index does increase in price. It increases its turnover by 27% and increases its price by between 2.7% and 5.5%, according to information cited by Kula in this paper, though it looks like the price increase tends to happen in the lead up to the stock being included. Interestingly, I have read an article but cannot now locate it, which states that there's a measurable, albeit fairly small, price bubble on stocks included in common indexes, on Monday mornings, Friday afternoons, and at the start and end of the month. That is, the times when mutual funds are most likely to rebalance their holdings. This almost certainly applies to a lesser extent to other stocks, too. My understanding is that the price difference was very small, however. Generally speaking, stocks which make part of well-known indexes will tend to be in higher demand than stocks which do not. It remains the case that almost all actively-managed mutual funds are unable to consistently beat the indexes, even with this taken into account. "There are certain allowable reasons to withdraw money from a 401K.  The desire to free your money from a ""bad"" plan is not one of them.   A rollover is a special type of withdrawal that is only available after one leaves their current employer.  So as long as you stay with your current company, you cannot rollover.  [Exception: if you are over age  59.5] One option is to talk to HR, see if they can get a expansion of offerings.  You might have some suggestions for mutual funds that you would like to see.  The smaller the company the more likely you will have success here.  That being said, there is some research to support having few choices.  Too many choices intimidates people. It's quite popular to have ""target funds""  That is funds that target a certain retirement year.  Being that I will be 50 in 2016, I should invest in either a 2030 or 2035 fund.  These are a collection of funds that rebalances the investment as they age.  The closer one gets to retirement the more goes into bonds and less into stocks.   However, I think such rebalancing is not as smart as the experts say.  IMHO is almost always better off heavily invested in equity funds.  So this becomes a second option.  Invest in a Target fund that is meant for younger people.  In my case I would put into a 2060 or even 2065 target. As JoeTaxpayer pointed out, even in a plan that has high fees and poor choices one is often better off contributing up to the match.  Then one would go outside and contribute to an individual ROTH or IRA (income restrictions may apply), then back into the 401K until the desired amount is invested.   You could always move on to a different employer and ask some really good questions about their 401K.  Which leads me back to talking with HR.  With the current technology shortage, making a few tweaks to the 401K, is a very cheap way to make their employees happy. If you can score a 1099 contracting gig, you can do a SEP which allows up to a whopping 53K per year.  No match but with typically higher pay, sometimes overtime, and a high contribution limit you can easily make up for it." (a) 5 funds for $15K is not too many or too few ? A bit high as I'd wonder if you've thought of how you'll rebalance the funds over time so you aren't investing too much in a particular market segment. I'd also question if you know what kinds of fees you may have with those funds as some of Vanguard's index funds had fees if the balance is under $10K that may change how much you'll be paying. From Vanguard's site: We charge a $20 annual account service fee for each Vanguard fund with   a balance of less than $10,000 in an account. This fee doesn’t apply   if you sign up for account access on Vanguard.com and choose   electronic delivery of statements, confirmations, and Vanguard fund   reports and prospectuses. This fee also doesn’t apply to members of   Flagship®, Voyager Select®, and Voyager Services®. So, if you don't do the delivery this would be an extra $100/year that I wonder if you factored that into things here. (b) Have I diversified my portfolio too much or not enough ? Perhaps I   am missing something that would be recommended for the portfolio of   this kind with this goal. Both, in my opinion. Too much in the sense that you are looking at Morningstar's style box to pick a fund for this box and that which I'd consider consolidating on one hand yet at the same time I notice that you are sticking purely to US stocks and ignoring international funds. I do think taxes may be something you haven't considered too much as stocks will outgrow most of those funds and trigger capital gains that you don't mention at all. (c) If not my choice of my portfolio, where would you invest $15K   under similar circumstances and similar goals. What is the goal here? You state that this is your first cash investment but don't state if this is for retirement, a vacation in 10 years, a house in 7 years or a bunch of other possibilities which is something to consider. If I consider this as retirement investments, I'd like pick 1 or 2 funds known for being tax-efficient that would be where I'd start. So, if a fund goes down 30%, that's OK? Do you have a rebalancing strategy of any kind? Do you realize what taxes you may have even if the fund doesn't necessarily have gains itself? In not stating a goal, I wonder how well do you have a strategy worked out for how you'll sell off these funds down the road at some point as something to ponder. Ending up with nothing is an unlikely situation unless you invest 100% in a company stock and the company goes under. In order to give you a good answer we need to see what options your employer gives for 401k investments. The best advice would be to take a list of all options that your employer allows and talk with a financial advisor. Here are a few options that you may or may not have as an option from an employer: Definitions from wikipedia: A target-date fund – also known as a lifecycle, dynamic-risk or age-based fund – is a collective investment scheme, usually a mutual fund, designed to provide a simple investment solution through a portfolio whose asset allocation mix becomes more conservative as the target date (usually retirement) approaches. An index fund or index tracker is a collective investment scheme (usually a mutual fund or exchange-traded fund) that aims to replicate the movements of an index of a specific financial market... An exchange-traded fund (ETF) is an investment fund traded on stock exchanges, much like stocks.[1] An ETF holds assets such as stocks, commodities, or bonds, and trades close to its net asset value over the course of the trading day. Most ETFs track an index, such as a stock index or bond index. ETFs may be attractive as investments because of their low costs, tax efficiency, and stock-like features. The capital stock (or stock) of an incorporated business constitutes the equity stake of its owners. Which one can you lose everything in? You can lose everything in stocks by the company going under. In Index funds the entire market that it follows would have to collapse. The chances are slim here since the index made up of several companies. The S&P 500 is made up of 500 leading companies publicly traded in the U.S.  A Pacific-Europe index such as MSCI EAFE Index is made up of 907 companies. The chances of losing everything in an ETF are also slim. The ETF that follows the S&P 500 is made up of 500 companies. An Pacific-Europe ETF such as MSCI EAFE ETF is made up of 871 companies. Target date funds are also slim to lose everything. Target date funds are made up of several companies like indexes and etfs and also mix in bonds and other investments depending on your age. What would I recommend? I would recommend the Index funds and/or ETFs that have the lowest fee that make up the following strategy for your age: Why Not Target Date Funds or Stocks? Target date funds have high fees. Later in life when you are closer to retirement you may want to add bonds to your portfolio. At that time if this is the only option to add bonds then you can change your elections. Stocks are too risky for you with your current knowledge. If your company matches by buying their stock you may want to consider reallocating that stock at certain points to your Index funds or ETFs. "My answer is Microsoft Excel.  Google ""VBA for dummies"" (seriously) and find out if your brokerage offers an 'API'.  With a brief understanding of coding you can get a spreadsheet that is live connected to your brokers data stream.  Say you have a spreadsheet with the 1990 value of each in the first two columns (cells a1 and b1).  Maybe this formula could be the third column, it'll tell you how much to buy or sell to rebalance them.   then to iterate the rebalance, set both a2 and b2 to =C1 and drag the formula through row 25, one row for each year.  It'll probably be a little more work than that, but you get the idea." I personally invest in 4 different ETFs.  I have $1000 to invest every month.  To save on transaction costs, I invest that sum in only one ETF each month, the one that is most underweight at the time. For example, I invest in XIC (30%), VTI (30%), VEA (30%), and VWO (10%).  One month, I'll buy XIC, next month VTA, next month, VEA, then XIC again.  Eventually I'll buy VWO when it's $1000 underweight.  If one ETF tanks, I may buy it twice in a row to reach my target allocation, or if it shoots up, I may skip buying it for a while.  My actual asset allocation never ends up looking exactly like the target, but it trends towards it.  And I only pay one commission a month. If this is in a tax-sheltered account (main TFSA or RRSP), another option is to invest in no-load index mutual funds that match the ETFs each month (assuming there's no commission to buy them).  Once they reach a certain amount, sell and buy the equivalent ETFs.  This is not a good approach in a non-registered account because you will have to pay tax on any capital gains when selling the mutual funds. "The problem with daily-rebalanced ""inverse"" or ""leveraged"" ETFs is that since they rebalance every day, you can lose money even if your guess as to the market's direction is correct. Quoting from FINRA'S guide as to why these are a bad idea: How can this apparent breakdown between longer term index returns and ETF returns happen? Here’s a hypothetical example: let’s say that on Day 1, an index starts with a value of 100 and a leveraged ETF that seeks to double the return of the index starts at $100. If the index drops by 10 points on Day 1, it has a 10 percent loss and a resulting value of 90. Assuming it achieved its stated objective, the leveraged ETF would therefore drop 20 percent on that day and have an ending value of $80. On Day 2, if the index rises 10 percent, the index value increases to 99. For the ETF, its value for Day 2 would rise by 20 percent, which means the ETF would have a value of $96. On both days, the leveraged ETF did exactly what it was supposed to do—it produced daily returns that were two times the daily index returns. But let’s look at the results over the 2 day period: the index lost 1 percent (it fell from 100 to 99) while the 2x leveraged ETF lost 4 percent (it fell from $100 to $96). That means that over the two day period, the ETF's negative returns were 4 times as much as the two-day return of the index instead of 2 times the return. That example is for ""just"" leveraging 2x in the same direction. Inverse funds have the same kind of issue. An example from Bogleheads Wiki page on these kinds of funds says that over 12/31/2007 to 12/31/2010, The funds do exactly what they say on any given day. But any losses get ""locked in"" each day. While normally a 50% loss needs a 100% gain to get back to a starting point, a fund like this needs more than a 100% gain to get back to its starting point. The result of these funds across multiple days doesn't match the index it's matching over those several days, and you won't make money over the long term. Do look at the further examples at the links I've referenced above, or do your own research into the performance of these funds during time periods both when the market is going up and going down. Also refer to these related and/or duplicate questions:" "Switching to only 401k or only SPY?  Both bad ideas.  Read on. You need multiple savings vehicles.  401k, Roth IRA, emergency fund.  You can/should add others for long term savings goals and wealth building.  Though you could combine the non-tax-advantaged accounts and keep track of your minimum (representing the emergency fund). SPY is ETF version of SPDR index mutual fund tracking the S&P 500 index.  Index funds buy weighted amounts of members of their index by an algorithm to ensure that the total holdings of the fund model the index that they track.  They use market capitalization and share prices and other factors to automatically rebalance.   Individual investors do not directly affect the composition or makeup of the S&P500, at least not visibly.  Technically, very large trades might have a visible effect on the index makeup, but I suspect the size of the trade would be in the billions.   An Electronically Traded Fund is sold by the share and represents one equal share of the underlying fund, as divided equally amongst all the shareholders.  You put dollars into a fund, you buy shares of an ETF. In the case of an index ETF, it allows you to ""buy"" a fractional share of the underlying index such as the S&P 500. For SPY, 10 SPY shares represent one S&P basket.  Targeted retirement plan funds combine asset allocation into one fund.  They are a one stop shop for a diversified allocation.  Beware the fees though.  Always beware the fees. Fidelity offers a huge assortment of plans.  You should look into what is available for you after you decide how you will proceed.  More later. SPY is a ETF, think of it as a share of stock.  You can go to a bank, broker, or what have you and set up an account and buy shares of it.  Then you have x shares of SPY which is the ETF version of SPDR which is an index mutual fund. If the company is matching the first 10% of your income on a 1:1 basis, that would be the best I've heard of in the past two decades, even with the 10 year vesting requirement.  If this is them matching 1 dollar in 10 that you contribute to 401k, it may be the worst I've ever heard of, especially with 10 year vesting.  Typical is 3-5% match, 3-5 year vesting. Bottom line, that match is free money.  And the tax advantage should not be ignored, even if there is no match. Research: I applaud your interest.  The investments you make now will have the greatest impact on your retirement.   Here's a scenario:  If you can figure out how to live on 50% of your take home pay (100k * 0.90 * 0.60 * 0.5 / 12) (salary with first 10% in 401k at roughly 60% after taxes, social security, medicare, etc. halved and divided by 12 for a monthly amount), you'll have 2250 a month to live on.  Since you're 28 and single, it's far easier for you to do than someone who is 50 and married with kids.  That leaves you with 2250 a month to max out 401k and Roth and invest the rest in wealth building.  After four or five years the amount your investments are earning will begin to be noticeable.  After ten years or so, they will eclipse your contributions.  At that point you could theoretically live of the income.  This works with any percentage rate, and the higher your savings rate is, the lower your cost of living amount is, and the faster you'll hit an investment income rate that matches your cost of living amount.  At least that's the early retirement concept.   The key, as far as I can tell, is living frugally, identifying and negating wasteful spending, and getting the savings rate high without forcing yourself into cheap behavior.  Reading financial independence blog posts tells me that once they learn to live frugally, they enjoy it.   It's a lot of work, and planning, but if you want to be financially independent, you are definitely in a good position to consider it. Other notes:"