Disclaimer: PortfolioGPT is an educational tool and is not a substitute for licensed financial advice. Nothing in this article constitutes investment, tax, or legal advice.
What is a fractional share?
A fractional share is a portion of a stock or ETF that is less than one whole share. Instead of needing hundreds or thousands of dollars to buy one share of a high-priced company, you can invest $5, $10, or $50 and still participate in that company’s performance.
The global fractional investing market was valued at approximately $4.8 billion in 2025 and is projected to reach $17.9 billion by 2034, growing at a compound annual rate of 15.2%. Mobile-based platforms now account for 65% of all fractional investing transactions as of mid-2026, reflecting how central smartphone access has become to this category.
Fractional shares are useful for three practical purposes:
- Starting with smaller amounts , you can build a diversified portfolio without waiting until you can afford full shares of every position.
- Dollar-cost averaging , buying a fixed dollar amount on a recurring schedule, regardless of price.
- Keeping cash fully deployed , instead of leaving money sitting idle because it is not enough for a full share, fractional investing keeps every dollar working.
For a deeper look at how fractional shares work mechanically, see AI Investing: Understanding Fractional Shares. If you want to combine fractional investing with a recurring, automated strategy, see AI Investing: Understanding Automatic Investing.
What should you look for in a fractional-share brokerage?
Not all fractional programs are equivalent. Before choosing, pay attention to four variables that actually affect how useful the program will be.
Minimum investment per fractional purchase
The leading brokers start at $1 per trade. Some require $5. The gap matters more than it sounds if you are building a diversified portfolio across many positions with a modest starting amount.
Commissions and fees
The industry standard is now $0 commissions on stocks and ETFs at major US brokers. Verify that no extra fee applies specifically to fractional trades , most do not charge one, but it is worth confirming.
Breadth of fractional coverage
Some programs are limited to a curated list , Schwab Stock Slices, for example, covers S&P 500 stocks. Others, like Fidelity and Interactive Brokers, cover thousands of securities. If your target portfolio includes small-cap stocks, international names, or specific ETFs, check coverage before opening an account.
Automation and recurring investment features
If you plan to invest on a schedule rather than making one-off purchases, look for recurring-buy tools, automatic dividend reinvestment, and portfolio-level automation. M1 Finance’s pie-based auto-invest is purpose-built for this; Fidelity and Robinhood also support recurring investments.
Best brokerages for fractional shares (2026)
Based on NerdWallet, StockBrokers.com, and WalletGrower reviews as of June-July 2026. Verify current program details directly with each broker before opening an account.
| Brokerage | Best for | Min. per fractional trade | Stock/ETF commission | Fractional coverage | Automation |
|---|---|---|---|---|---|
| Fidelity | Most investors , broadest coverage, lowest min | $1 | $0 | 7,000+ stocks & ETFs (Stocks by the Slice) | Recurring buys, DRIP, automatic investing tools |
| Interactive Brokers | Globally diversified, institutional-grade | $0.01 | $0 (IBKR Lite) | 10,500+ stocks across global markets | Recurring orders, DRIP |
| Robinhood | Mobile-first beginners | $1 | $0 | NMS stocks & ETFs (thousands) | Recurring investments, simple interface |
| Charles Schwab | Research-heavy investors, full-service feel | $5 | $0 | S&P 500 stocks primarily (Stock Slices) | DRIP, planning tools, up to 30 slices per transaction |
| M1 Finance | Automated, pie-based portfolio investors | $1 | $0 | Stocks & ETFs | Auto-invest into custom pies, automatic rebalancing |
| SoFi Invest | Long-term simplicity, goal-based investors | $5 | $0 | 4,700+ stocks & ETFs | Recurring investments, goal-based tools |
| Webull | Active traders who want fractional + charting | $5 | $0 | US stocks & ETFs | Fractional purchases, advanced technical tools |
| eToro | Social trading and global exposure | ~$10 (region-specific) | $0 on many US stocks | Global stock list, thematic portfolios | Copy-trading, recurring investments |
How to choose a brokerage for fractional shares
Follow this five-step process before opening an account:
- Define your minimum investment amount. Decide how much you plan to invest per trade. If you are starting with very small amounts, look for brokers with a $1 minimum like Fidelity or Robinhood. If you are comfortable with $5 minimums, Schwab and SoFi also qualify.
- Check fractional coverage for the securities you want. Confirm that the broker supports fractional purchases for the specific stocks and ETFs in your target portfolio. Fidelity and Interactive Brokers offer the broadest coverage; Schwab Stock Slices is limited to S&P 500 names.
- Evaluate automation and recurring investment features. If you want to invest automatically on a schedule, prioritize brokers with strong recurring-buy and dividend-reinvestment features. M1 Finance’s pie-based auto-invest and Fidelity’s automatic investing tools are strong choices.
- Match the platform to your experience level and needs. Beginners often benefit from simpler apps like Robinhood or SoFi. Research-focused or globally diversified investors typically need Interactive Brokers or Fidelity’s deeper toolset.
- Build your target allocation before you buy. Use a portfolio planning tool like PortfolioGPT to define your target asset allocation first. Once you know your target mix, choose the brokerage that makes executing that plan simplest for your situation.
Which investors does each broker suit best?
New investors starting small
Fidelity, Robinhood, and M1 Finance all start at $1 and charge no commissions. They are the lowest-friction entry points for investors building their first portfolio. The Dalbar Quantitative Analysis of Investor Behavior (QAIB) consistently shows that the average equity investor underperforms the S&P 500 by 1.5-4% annually, largely due to emotional timing decisions. A structured, recurring fractional-share plan helps sidestep that trap.
Long-term, set-it-and-forget investors
M1 Finance is purpose-built for this profile. Its pie-based system lets you define target allocation percentages across stocks and ETFs, then automatically deploy new contributions to restore that balance. SoFi Invest is a simpler alternative with goal-based tools.
Research-heavy and globally diversified investors
Interactive Brokers is the strongest choice here , 10,500+ eligible fractional securities across US and international markets, institutional-grade research, and a $0.01 minimum. According to Interactive Brokers, fractional shares for its full range became available starting January 2026. Fidelity is the best domestic alternative, with deeper research tools than Robinhood or M1.
Mobile-first active traders
Robinhood and Webull lead this category. Robinhood’s interface is the simplest; Webull adds advanced charting and technical analysis tools for investors who want more depth without switching to a desktop platform.
Fidelity vs. Schwab for fractional shares
These two are the most direct competitors for full-service fractional investing. Here is how they compare on the details that matter:
| Feature | Fidelity (Stocks by the Slice) | Charles Schwab (Stock Slices) |
|---|---|---|
| Minimum per trade | $1 | $5 |
| Stock coverage | 7,000+ US stocks & ETFs | S&P 500 stocks primarily |
| ETF fractional support | Yes | Limited |
| Max slices per transaction | No stated limit | Up to 30 per transaction |
| Commission | $0 | $0 |
| Dividend reinvestment | Yes | Yes |
| Research tools | Strong (Fidelity-native) | Strong (thinkorswim platform) |
| Physical branches | ~200 | 400+ |
For most investors who want the widest fractional menu and the lowest minimum, Fidelity wins on program breadth. Schwab wins for investors who value physical branch access and the thinkorswim trading platform for more advanced analysis.
How fractional shares fit into a real portfolio strategy
Fractional shares are a tool, not a strategy. The strategy is the allocation , the specific mix of assets that fits your time horizon, risk tolerance, and financial goals.
A landmark study by Brinson, Hood & Beebower (1986) found that asset allocation decisions explain approximately 90% of the variability in portfolio returns over time. That means deciding how to distribute your capital across asset classes matters far more than which specific platform you use to buy the slices.
The practical implication: before choosing a brokerage, define your target allocation. Once you know you want, say, 60% US stocks, 20% international stocks, 15% bonds, and 5% cash equivalents , then choose the broker that makes executing that plan most straightforward.
PortfolioGPT can help you:
- Generate a portfolio designed around your actual goals and risk profile.
- Compare allocation ideas across different asset class mixes before committing.
- Turn a recurring fractional-share contribution into a structured, goal-aligned plan rather than a collection of random positions.
The relevant cross-links for readers at this stage:
- AI Investing: Understanding Fractional Shares , for the conceptual foundation.
- AI Investing: Understanding Automatic Investing , for combining fractional shares with a recurring, automated strategy.
FAQ
Which brokerage is best for fractional shares?
Fidelity is the best all-around brokerage for fractional shares in 2026, offering a $1 minimum, $0 commissions, and access to more than 7,000 stocks and ETFs through its Stocks by the Slice program. Interactive Brokers is the best option for globally diversified investors, with fractional trading across more than 10,500 securities starting at $0.01.
What is the minimum amount to buy fractional shares?
Minimums vary by broker. Fidelity, Robinhood, and M1 Finance allow fractional purchases starting at $1. Interactive Brokers allows purchases as low as $0.01. Charles Schwab and SoFi Invest require a $5 minimum per fractional trade.
Can you buy fractional shares of ETFs?
Yes , Fidelity, Interactive Brokers, Robinhood, M1 Finance, and SoFi Invest all support fractional purchases of ETFs in addition to individual stocks. Charles Schwab’s Stock Slices program is primarily focused on S&P 500 stocks and has more limited ETF fractional coverage.
Are fractional shares commission-free?
Yes, at all major US brokerages. Fidelity, Charles Schwab, Robinhood, M1 Finance, SoFi Invest, Webull, and Interactive Brokers (IBKR Lite) all offer $0 commissions on fractional stock and ETF trades.
Does Vanguard offer fractional shares?
Vanguard does not support fractional purchases of individual stocks. It does allow fractional investments in its own ETFs and mutual funds through its direct platform, but it is not a strong choice if broad fractional stock access is a priority.
What is the difference between Fidelity Stocks by the Slice and Schwab Stock Slices?
Fidelity Stocks by the Slice covers more than 7,000 US stocks and ETFs starting at $1 per trade. Schwab Stock Slices is focused on S&P 500 stocks, requires a $5 minimum, and allows up to 30 slices in a single transaction. Fidelity offers broader coverage and a lower minimum, while Schwab pairs fractional investing with deeper research and planning tools.
How do fractional shares fit into a long-term portfolio strategy?
Fractional shares make it easier to maintain a diversified, target allocation without needing large lump sums. They are especially useful for dollar-cost averaging, keeping idle cash fully invested, and building a portfolio that matches a specific asset allocation : which is where a tool like PortfolioGPT can help you plan the target before choosing where to execute it.
Quick answer
Fractional shares let you buy a portion of any stock or ETF for as little as $1, making diversification accessible regardless of account size. In 2026, the best brokerages for fractional shares are Fidelity (broadest coverage, $1 minimum), Interactive Brokers (10,500+ securities, $0.01 minimum), M1 Finance (best for automated pie-based portfolios), and Robinhood (simplest mobile experience). All of the top platforms charge $0 commissions. The right choice depends on how much you plan to invest per trade, which securities you want to buy fractionally, and how much automation you need. Before picking a platform, define your target allocation : that decision shapes your returns far more than the choice of broker.