BLBX vs HOOD vs MKTX vs IBKR

For growth investors, Robinhood Markets, Inc.

(HOOD) is the stronger pick with 51. 6% revenue growth year-over-year, versus -5. 3% for Blackboxstocks Inc. (BLBX). MarketAxess Holdings Inc. (MKTX) offers the better valuation at 22. 2x trailing P/E (18. 0x forward), making it the more compelling value choice. Analysts rate Robinhood Markets, Inc. (HOOD) a "Buy" — based on 25 analyst ratings — the highest consensus in this comparison. The "better buy" depends entirely on your goals: growth investors should weight revenue trajectory, value investors should weight P/E and PEG, and income investors should weight dividend yield and streak.

On trailing P/E, MarketAxess Holdings Inc.

(MKTX) is the cheapest at 22. 2x versus Interactive Brokers Group, Inc. at 38. 0x. On forward P/E, MarketAxess Holdings Inc. is actually cheaper at 18. 0x. The PEG ratio (P/E divided by earnings growth rate) is the most growth-adjusted single valuation metric: Robinhood Markets, Inc. wins at 0. 16x versus Interactive Brokers Group, Inc. 's 1. 14x — a PEG below 1. 0 traditionally signals the market is underpricing earnings growth.

Over the past 5 years, Interactive Brokers Group, Inc.

(IBKR) delivered a total return of +402. 3%, compared to -63. 2% for MarketAxess Holdings Inc. (MKTX). Over 10 years, the gap is even starker: IBKR returned +831. 5% versus BLBX's -92. 4%. Past returns do not guarantee future results, and the stock with the higher historical return may already have its best growth priced in.

By beta (market sensitivity over 5 years), MarketAxess Holdings Inc.

(MKTX) is the lower-risk stock at -0. 33β versus Robinhood Markets, Inc. 's 3. 02β — meaning HOOD is approximately -1024% more volatile than MKTX relative to the S&P 500. On balance sheet safety, Interactive Brokers Group, Inc. (IBKR) carries a lower debt/equity ratio of 0% versus 168% for Robinhood Markets, Inc. — giving it more financial flexibility in a downturn.

By revenue growth (latest reported year), Robinhood Markets, Inc.

(HOOD) is pulling ahead at 51. 6% versus -5. 3% for Blackboxstocks Inc. (BLBX). On earnings-per-share growth, the picture is similar: Robinhood Markets, Inc. grew EPS 31. 4% year-over-year, compared to -13. 6% for Blackboxstocks Inc.. Higher growth typically commands a higher valuation multiple — check whether the premium P/E or P/S is justified by the growth rate using the PEG ratio.

Robinhood Markets, Inc.

(HOOD) is the more profitable company, earning 42. 1% net margin versus -182. 1% for Blackboxstocks Inc. — meaning it keeps 42. 1% of every revenue dollar as bottom-line profit. Operating margin tells a similar story: IBKR leads at 86. 0% versus -165. 7% for BLBX. At the gross margin level — before operating expenses — IBKR leads at 89. 8%, reflecting greater pricing power or product mix advantage. Stronger margins indicate durable pricing power, lower cost of revenue, or higher mix of software/services. They are one of the clearest signs of business quality.

The PEG ratio (forward P/E divided by expected earnings growth rate) is the most precise measure of undervaluation relative to growth potential.

By this metric, Robinhood Markets, Inc. (HOOD) is the more undervalued stock at a PEG of 0. 16x versus Interactive Brokers Group, Inc. 's 1. 14x. A PEG below 1. 0 is traditionally considered the threshold for growth-adjusted undervaluation. On forward earnings alone, MarketAxess Holdings Inc. (MKTX) trades at 18. 0x forward P/E versus 41. 2x for Robinhood Markets, Inc. — 23. 2x cheaper on a one-year earnings basis. Analyst consensus price targets imply the most upside for HOOD: 52. 1% to $117. 14.

In this comparison, MKTX (2.

1% yield), IBKR (0. 4% yield) pay a dividend. BLBX, HOOD do not pay a meaningful dividend and should not be held primarily for income.

For long-horizon retirement investors, MarketAxess Holdings Inc.

(MKTX) is the stronger choice — it scores higher on the combination of lower volatility, dividend reliability, and long-term compounding (low volatility (β -0. 33), 2. 1% yield). Blackboxstocks Inc. (BLBX) carries a higher beta of 2. 09 — meaning larger drawdowns in market downturns, which matters significantly when you cannot wait years for a recovery. Both have compounded well over 10 years (MKTX: +34. 2%, BLBX: -92. 4%), confirming both are viable long-term holds — but the lower-volatility option typically results in less emotional selling during corrections. Retirement portfolios generally favour predictability over maximum returns. Consult a financial advisor before making allocation decisions.

These companies operate in different sectors (BLBX (Technology) and HOOD (Financial Services) and MKTX (Financial Services) and IBKR (Financial Services)), which means they face different economic cycles, regulatory environments, and macro sensitivities — making direct comparison nuanced.

In terms of investment character: BLBX is a small-cap quality compounder stock; HOOD is a mid-cap high-growth stock; MKTX is a small-cap quality compounder stock; IBKR is a mid-cap quality compounder stock. MKTX pays a dividend while BLBX, HOOD, IBKR do not, making them suitable for different income and tax situations. These fundamental differences mean investors should not choose between them on a single metric — the "better stock" depends entirely on which of these characteristics aligns with your investment strategy.