MIAX: An Options Tollbooth Dressed Up as a Growth Stock
Dissecting the real earning power, growth ceiling, and rational entry price of America's fourth-largest options exchange
The One-Liner
MIAX’s options core is an excellent business — high fixed costs, low marginal costs, 68% segment operating margins. But at $52, the market is pricing a “growth exchange,” when the reality is closer to a “steady-state cash machine plus a handful of lottery tickets that will most likely expire worthless.” Three independent valuation models produce expected values of $25–$32 per share; even the most optimistic long-term anchor lands at $35. The current price implies 37–40x owner earnings — more expensive than both CME and Cboe.
How the Business Makes Money
MIAX operates four U.S. multi-listed options exchanges (MIAX Options, Pearl, Emerald, Sapphire). At its core, this is a “transaction tax” business.
The revenue formula is simple: Net Revenue = Industry ADV × MIAX Market Share × RPC. ADV (Average Daily Volume) is the industry-wide daily options contract count, currently around 60 million. MIAX’s market share sits at 17–18%. RPC (Revenue Per Contract) is the net amount the exchange keeps per contract after subtracting liquidity payments (rebates paid to market makers) from gross fees — currently about $0.110.
But looking at gross revenue is misleading. FY2025 gross revenue was roughly $1.36 billion, of which $840 million passed straight through to market makers as liquidity payments. MIAX’s true net revenue was only $430 million — a 31.6% net revenue rate. You cannot value this business off gross revenue; you must start from net revenue.
Net revenue comes from three sources with entirely different economic characteristics:
Transaction and clearing fees (roughly 87% of net revenue) are directly tied to trading volumes. When volatility is high, volumes surge and revenue follows; when volatility is low, volumes shrink and revenue drops. MIAX is, to a meaningful degree, a weather-dependent business.
Access fees and market data fees (roughly 13% of net revenue, about $120 million per year) are the monthly rents market makers and brokers pay to connect to MIAX’s network, plus subscriptions for real-time quote data. These carry almost no variable costs — pure tollbooth economics. As MIAX’s share has grown from 15% to 18%, more brokers must connect to satisfy “best execution” obligations, creating a positive feedback loop. This is the hidden profit engine.
The Four-Exchange Strategy: One Tech Stack, Four Microstructure Flavors
Understanding MIAX’s competitive strategy requires grasping two pairs of opposing concepts.
Matching priority: Price-Time vs. Pro-Rata. Price-Time is first-come-first-served — speed wins. Pro-Rata allocates fills proportionally to displayed size — no speed advantage, just quote more size and you get a larger share of fills.
Fee direction: Maker-Taker vs. Taker-Maker vs. Customer Rebate. Maker-Taker pays rebates to liquidity providers and charges liquidity takers. Taker-Maker is the inverse — it pays those who aggressively take liquidity and charges those who post it. Customer Rebate gives retail customers free or discounted trading while charging market makers.
MIAX covers all four major microstructure preferences with a 2×2 matrix:
MIAX Options (Pro-Rata + Customer Rebate) → attracts traditional market makers and retail order flow.
Pearl (Price-Time + Maker-Taker) → attracts high-frequency market makers and electronic liquidity providers.
Emerald (Pro-Rata + Maker-Taker) → a hybrid appealing to market makers who want both size-based allocation and maker rebates.
Sapphire (Price-Time + Taker-Maker) → attracts complex institutional order flow, plus a physical trading floor for multi-leg strategies.
The critical insight: all four exchanges run on the same proprietary matching engine. Building the first exchange was expensive; the marginal cost of each subsequent one is trivial — essentially a different configuration file on the same system. Even if each microstructure niche captures only 3–5% share, four of them add up to 17%+. This cost advantage is structural: Cboe’s four options exchanges were partly assembled through acquisitions with non-unified tech stacks, and Nasdaq’s six exchanges carry different legacy systems.
Why the Pro-Rata Exchange Is MIAX’s Core
MIAX Options is the highest-volume of the four, running on a Pro-Rata + Customer Rebate model. Understanding why this model matters starts with how market makers earn their living.
Market makers post simultaneous bids and offers to earn the spread, but their biggest fear is adverse selection — trading against someone who knows something they don’t and immediately losing money. Retail customer orders are “non-toxic” (low information content), and market makers prize this flow above all else.
On a Pro-Rata exchange, market makers receive fills proportional to their displayed size — quote enough volume and you are guaranteed a share of every retail order that arrives, with no need to race high-frequency firms for queue priority. Many large market makers (Citadel, Susquehanna) have affiliated retail brokerage operations or PFOF (Payment for Order Flow) arrangements. They can route retail orders to Pro-Rata exchanges through affiliated channels, where their own market-making desks are already quoting large size — ensuring a high probability that the orders they send in are filled against their own quotes.
This creates a closed loop: the market maker is both the liquidity supplier (posting quotes) and, through affiliated channels, influences the demand side (order routing). Pro-Rata rules guarantee that size equals allocation. This is the structural reason MIAX Options reliably attracts major market makers.
But it is also the risk: the top three customers account for roughly 45% of MIAX’s revenue.
From Adjusted EBITDA to Owner Earnings: The 40% Gap
This is the single most critical step in valuing MIAX, and the one most sell-side reports and Substack write-ups skip entirely.
Management reports FY2026 Adjusted EBITDA of approximately $250 million. But this figure has three major leakages before it becomes cash a common shareholder can actually take home:
SBC (Stock-Based Compensation): $27–30 million per year. Management adds back nearly all of it, claiming the IPO-related RSA and warrant vesting was a one-off and only $3.7 million per quarter in stock option expense is recurring. But even after the IPO-related surge fades, steady-state SBC is likely $15–18 million per year. This is a real economic cost — it dilutes existing shareholders.
Maintenance CapEx: $20–28 million per year. The company does not disclose the maintenance vs. growth split. Exchanges require continuous investment in data centers, matching engine upgrades, and compliance systems. These are non-discretionary expenditures necessary to keep the business running.
Normalized taxes at 27–29%. Adjusted EBITDA is pre-tax.
Double-counting of interest income. If you add $508 million of clean cash separately back to equity value, you cannot also capitalize the interest income that cash generates inside owner earnings — otherwise you count the principal and the interest twice.
After all adjustments:
Adjusted EBITDA: $250M Less normalized SBC: ($17M) Less maintenance CapEx: ($23M) After-tax adjustment (×0.72) Less after-tax cash interest income: ($8M) = Operating Owner Earnings: ~$142M ÷ 109M fully diluted shares = Operating OEPS: $1.29/share
Current price of $52 ÷ $1.29 OEPS = 40x owner earnings.
For comparison: CME trades at 22–28x, Cboe at 20–25x, ICE at 22–27x. MIAX is more expensive than every mature peer despite having a shallower moat, shorter operating history, and higher customer concentration.
What Is the Real Growth Rate
Decomposing MIAX’s net revenue growth into four variables:
Industry ADV growth (TAM proxy): OCC data shows roughly 3–5% per year during 2016–2019 (low-vol period), a 50%+ jump in 2020 (COVID), and roughly 8–9% per year during 2022–2024. Structural drivers include the explosion of 0DTE options (Zero Days to Expiration — a category that barely existed before 2022, now accounting for 57% of SPX options volume), rising retail participation, and FLEX options growth (10x the 2019 level). Cyclical drivers are the volatility regime — the 2020–2025 period has been an unbroken sequence of high-event-density environments. Stripping out the cyclical component, structural ADV growth is roughly 5–7% per year.
Market share change: MIAX went from 0% in 2012 to 17–18% in 2026, but growth was step-function — each new exchange launch created a plateau. All four are now live, and the ERP has expired. Further gains require taking share from competitors while MEMX runs the same playbook in pursuit. 17–18% is more likely a steady-state ceiling than a growth mid-point. Neutral assumption: ±0.5% per year.
RPC change: The long-term industry trend is flat to slightly declining (-1% to +1% per year). Sapphire floor mix improvement partially offsets competitive fee pressure.
Non-trading revenue growth: Access fees plus data fees at roughly $120 million per year, growing 3–5% per year.
Combined: MIAX’s normalized net revenue growth rate is approximately 5–7% per year. This is far below the 40% YoY growth posted in Q1 2026 — that was the product of peak ADV, share expansion, rising RPC, and a non-trading revenue jump all blowing in the same direction simultaneously.
What the Steady-State Cash Cow Is Worth
If MIAX ceased all “burn-capital-for-growth” investments and ran the options core purely as a cash flow machine:
Shut down or sell the Futures segment: saves roughly $25–30M/year (current annual loss of $34M, net of Dorman’s marginal profit).
Compress SBC to maintenance level: from $27–30M down to $15–18M, saving roughly $10–12M.
Cut growth CapEx: from $40–50M down to $20–25M maintenance only, saving roughly $15–25M.
Eliminate growth-related headcount and operations: Bloomberg project team, national ad campaign, etc., saving roughly $10–15M.
Restructured steady-state OE comes to approximately $193 million, or $1.77 per share.
But a “no-brainer price” cannot use the steady-state $1.77 — it must use the Bear steady state (ADV reverts to a low-vol environment, share slips to 15–16%, RPC drifts lower). Bear steady-state cash cow OE is roughly $140–150M. Apply 12–14x (the valuation trough for mature exchanges in low-growth environments), add back clean cash of $508M plus DTA of $32M less litigation reserve of $50M:
Bear steady-state value: approximately $21/share.
At $21, your downside protection is the Bear cash cow floor. Upside is free: if industry ADV continues its structural growth, share holds at 17%, and Sapphire keeps contributing mix improvement, OE could reach $170M+ in three years, and 15–17x gets you to $28–$31/share — a 35–50% return. If Bloomberg futures somehow succeed, that is an even larger free option.
Bloomberg B500: A Lottery Ticket That Will Most Likely Expire Worthless
MIAX secured an exclusive 10-year license from Bloomberg to list futures, options on futures, and cash-settled index options on the Bloomberg 500 and Bloomberg 100 indices — a direct challenge to CME’s E-mini S&P 500 (ES) franchise.
Management’s pitch: Bloomberg’s brand is strong, the smaller contract size suits retail (Tini multiplier of $10), OCC clearing creates synergies with MIAX’s options ecosystem, and free market data lowers the retail barrier.
But the S&P 500 moat is not one layer — it is five nested layers of network effects:
Passive fund lock-in. Roughly $7–8 trillion of global passive assets track the S&P 500. Fund managers use ES futures for equitization — the foundational “water supply” for ES volume. No passive product tracks the Bloomberg 500. Without ETFs or index funds referencing B500, there is no structural demand for the futures.
Language lock-in. The entire financial industry uses the S&P 500 as its universal coordinate system. Using B500 to hedge an S&P 500 benchmark introduces tracking error that is impossible to eliminate. No one will accept that explanatory cost to save a few cents on trading fees.
Derivatives ecosystem self-reinforcement. ES is surrounded by SPX options, VIX futures and options, weekly and 0DTE expirations, and FLEX options. Market makers delta-hedge across these products, generating enormous derivative trading volume. B500 has nothing around it — no options, no VIX equivalent, no weekly expirations.
Brand asset. The S&P Index Committee’s every rebalancing decision triggers market-wide chain reactions. Bloomberg 500, if purely rules-based and mechanical, actually lacks this event-driven attention and trading demand.
Regulatory inertia. Margin calculation models, VaR stress tests, and statutory reserve calculations directly reference the S&P 500. Getting B500 into these frameworks requires lengthy approval processes no one is incentivized to initiate.
Historically, every direct challenge to CME’s equity index futures liquidity — Eurex US, OneChicago, Cboe — has failed. The success rate is near zero. The sole exception was DTB (predecessor of Eurex) seizing Bund futures dominance from LIFFE in the 1990s via a generational advantage: electronic trading vs. open outcry. MIAX has no such generational edge over CME.
The most lethal obstacle is cross-margin. B500 clears at OCC; ES clears at CME Clearing. Cross-CCP margin netting between the two is virtually impossible. An institution holding positions in both must post full margin at each clearinghouse — capital efficiency is halved.
Probability of meaningful revenue contribution: roughly 5–10%. Probability of outright failure: 60–70%.
MEMX: The Underestimated Competitive Threat
In 2019, Citadel, Fidelity, Schwab, and six other Wall Street giants jointly founded MEMX (Members Exchange). Its options exchange launched in September 2023 and within two years captured roughly 4% market share. A second options exchange, MX2, launches in Q2 2026 using a Pro-Rata model — a direct collision with MIAX’s core.
MEMX’s threat is not about “replacing” MIAX. It operates on three levels:
Fee pressure. MEMX was created explicitly to push down exchange fees. Its connectivity and data pricing remains well below industry norms. MIAX’s access and data fees — that “hidden profit engine” — will likely face growing price compression.
Same playbook, same niche. MX2’s Pro-Rata model competes head-to-head with MIAX Options and Emerald. MEMX’s technology is also fully proprietary and next-generation, with quote quality ranked in the top three industry-wide.
The shareholders are the customers. Citadel is simultaneously one of MIAX’s largest market makers and a founding shareholder of MEMX. When MEMX offers a comparable product at lower cost on a platform where Citadel has governance influence, routing more flow to MEMX is a rational choice.
MEMX has not yet reached a scale that threatens MIAX’s dominance (4% vs. 17%), but if MX2 ramps as fast as its first exchange did, MIAX’s position as the sole meaningful “challenger” will erode — from “the largest alternative to Cboe/Nasdaq/NYSE” to “one of two alternatives.”
What the Current Valuation Is Paying For
At $52, the implied 37–40x owner earnings means the market is paying for three things:
Sustained growth in the options core (TAM expansion plus stable share).
Continued operating leverage (margin expansion).
Narrative value from Bloomberg futures and other unrealized options.
The first two have some operational evidence behind them. The third is almost entirely story premium — before the product delivers actual ADV and open interest data, the market tends to assign a positive option value rather than zero.
Q1 2026’s adjusted EPS of $0.42 massively beat analyst expectations ($0.27–$0.38), but this is the product of a cyclical peak layered with generous accounting. Q1 industry ADV was at an all-time high, and adjusted EPS excludes SBC and maintenance CapEx. Steady-state quarterly OEPS is closer to $0.32–$0.35, not $0.42.
The No-Brainer Price and What to Track
No-brainer price: $20–$23 per share. At this level you pay a fair-to-cheap price for what already exists: Bear steady-state cash cow value (13x Bear OE plus clean cash) provides the floor, and every unrealized possibility — industry growth, share stability, Bloomberg futures — comes free. The current $52 is 60% above this range.
Three things to track over the next 3–5 years:
1. Post-ERP share defense in a low-volatility environment. Monitor monthly OCC exchange-level data, focusing on months where average VIX is below 15 and checking whether MIAX’s total share holds above 16%. Simultaneously watch whether MEMX’s MX2 launch erodes MIAX’s Pro-Rata share — not as a standalone tracking item, but as a sub-signal within this broader share durability question. If share drops below 15% for two consecutive quarters, the entire Base case needs to be rewritten.
2. The structural floor for industry ADV. Over the past six years, U.S. options ADV surged from roughly 20 million to 60 million, but has never been tested by a genuine low-volatility drought. Whether the incremental volume from 0DTE and retail participation is structural or cyclical can only be verified in a sustained low-vol environment. If ADV holds above 40 million during months with VIX below 15, the structural growth thesis is intact. If it falls back to 30–35 million, MIAX’s revenue contracts 20–25%, operating leverage works in reverse, and normalized OE must be marked down from $142M to $110–120M.
3. Bloomberg B500 traction and management’s capital discipline. The question is not whether B500 succeeds (it most likely will not), but two observable facts: whether ADV exceeds 1,000 contracts per day twelve months after launch, and whether management has a clear stop-loss plan when the data shows failure. The Futures segment burns $34 million per year; three years without a shut-down decision means over $100 million of cash value evaporated (approximately $0.92 per share). If the product shows no traction but management continues to express “long-term confidence” without setting exit criteria, that is a capital allocation red flag.
Conclusion
MIAX is a good business at the wrong price. The options core has an excellent economic model — high fixed costs, low marginal costs, operating leverage that is visibly being realized, and share that has actually grown after the ERP expired. But $52 front-loads 3–5 years of growth into today’s price while leaving almost no margin of safety for downside scenarios: MEMX competition, ADV mean-reversion, or Bloomberg failure.
The price that turns this into a “no-brainer” investment is the $20–$23 range — where you are paying for cash flows that already exist and need no prediction about the future to justify the purchase. The distance from $52 to $21 is 60%, but given that the post-IPO sell-down is not fully absorbed, Bloomberg could deliver disappointing data after launch, and the next low-volatility cycle will eventually arrive, that gap may not be as unreachable as it seems.
Patience.