With an Admiral or Investor Share Class of the Vanguard S&P500 Fund, you can dollar-cost-average more effectively than if you were to purchase SPY or VOO on your own via Robinhood or any other broker such as Interactive Brokers, Etrade, Fidelity, TD-Ameritrade, etc. Then choose “Vanguard Funds” from the list of options. See the Vanguard Brokerage Services commission and fee schedules for limits. The Vanguard ETF's usually have the same expense ratio of the same admiral class mutual fund - and they are all backed by the same assets. Only Vanguard can sell VTSAX as a mutual fund though. Using their mutual fund screener tool and sorting by total net assets, you can see that these include some of the very well-known brands like Vanguard, Fidelity, PIMCO, and American Funds. I wasn’t thrilled with the idea until I found that TD Ameritrade had a special program that allowed you to buy many low-cost ETFs commission-free… and VTI was on the list. Boglehead-style investing at TD Ameritrade. However, my one diversion from this philosophy has been my broker: instead of investing directly through Vanguard into their mutual funds, I have purchased their ETFs through TD Ameritrade, where one has been able to buy/sell most popular Vanguard ETFs commission-free for a few years now. Participating in a new IPO through TD Ameritrade allows you to purchase stock at the IPO price. Vanguard asked that the cash be put in the Vanguard money market fund. The IPO price is determined by the investment banks hired by the company going public. If so - don't buy a Vanguard mutual fund at TD Ameritrade. I’m going to make it easy and list out the 3 major funds that I focus on within Vanguard. TD Ameritrade offers mutual funds from hundreds of different fund families. The reason you can’t buy VTSAX through TD Ameritrade is simple: Vanguard has reserved the right to sell their Admiral Shares mutual funds. The link to Buy Vanguard funds. If you meet eligibility requirements and TD Ameritrade is participating in the IPO you are interested in, you can place a conditional offer to buy. Given the above, it is rather odd that you can still research VTSAX on TD Ameritrade as if it was available: You must buy and sell Vanguard ETF Shares through Vanguard Brokerage Services (we offer them commission-free) or through another broker (which may charge commissions). TD Ameritrade, Fidelity and Ally Invest charge straightforward $0 for stock and ETF trades. However, Ameritrade can sell the equivalent ETF, which is the Vanguard Total Stock Market ETF . The building blocks of Boglehead-style investing are low-expense-ratio index mutual funds and/or ETFs.Vanguard fans would suggest that Vanguard has the best and most complete lineup of such funds, and that the most convenient place to hold Vanguard mutual funds is directly at Vanguard. Buy from Ameritrade since Vanguard also charges with transaction fees and IRA custodian fees or also look into Vanguard ETF's which trade like stocks but perform like mutual funds… Buy and sell at Vanguard Step 5: Choose Your Three Fund Portfolio. Instead - sign up for commission free ETFs - and take advantage of TD Ameritrade's immense selection of commission free Vanguard ETFs. Mutual fund transactions are $49.99 at Fidelity, $49.99 at TD Ameritrade, $20 at Vanguard … This is probably the hardest part.