David Baszucki and Erik Cassel are the two co-founders of Roblox, and that shared origin is exactly why their names get searched together in the context of net worth. The short answer: Baszucki's estimated net worth as of early 2026 sits in the range of $3 billion to $4.5 billion, driven almost entirely by his equity stake in Roblox Corporation (NYSE: RBLX). Erik Cassel, who passed away in February 2013 from cancer before Roblox became a public company, does not have a current net worth in the conventional sense, any wealth tied to his early equity stake would have passed to his estate. The two figures are not additive in any meaningful present-day sense, but understanding both helps paint a complete picture of how Roblox's founding ownership translated into real financial value.
David Baszucki and Erik Cassel Net Worth: Estimates Explained
Who David Baszucki and Erik Cassel are, and why they're always mentioned together
David Baszucki co-founded Roblox in 2004 alongside Erik Cassel, and he has served as CEO and Chairman of Roblox Corporation since its formal incorporation. Before Roblox, Baszucki co-founded Knowledge Revolution in the early 1990s, a physics simulation software company that was eventually acquired by MSC Software in 1998. That earlier entrepreneurial experience directly informed the design philosophy behind Roblox's user-generated game platform. Baszucki is the public face of the company and remains its largest individual insider shareholder as of the most recent SEC filings.
Erik Cassel was Roblox's co-founder and served as its Vice President of Engineering during the platform's formative years. He was instrumental in building the technical architecture that made Roblox's massively multiplayer, user-generated game environment possible. Cassel passed away on February 11, 2013, after a three-year battle with cancer. He died eight years before Roblox went public via a direct listing on the New York Stock Exchange in March 2021, which means he never personally participated in the public market wealth event that defined Baszucki's headline net worth figures. Roblox has maintained a memorial to him on the platform, which reflects how central he was to the company's early identity.
The reason the two names get paired in net worth searches is simple: they were equal partners in founding the company that became worth tens of billions of dollars. People naturally want to know what that founding stake was worth for each of them, and the answer requires understanding how Roblox ownership actually works.
How Roblox ownership actually drives these net worth numbers
Roblox operates a dual-class share structure, which is common among founder-led tech companies. Class A shares (ticker: RBLX) trade publicly on the NYSE and carry one vote per share. Class B shares are not publicly traded, are held by insiders like Baszucki, and carry 20 votes per share, giving the founder substantial voting control even if his economic ownership percentage is diluted over time. When estimating Baszucki's net worth, analysts and wealth trackers take his disclosed beneficial ownership of both share classes (pulled from annual proxy filings, specifically the DEF 14A, and annual 10-K reports), multiply the share count by the current RBLX stock price, and add any other disclosed financial assets.
Around Roblox's March 2021 IPO, CNBC reported that Baszucki's stake was worth approximately $4.6 billion at the opening price. That figure was derived from his disclosed share count multiplied by the reference price and market open price on IPO day. Since then, RBLX stock has moved considerably, trading as high as roughly $135 per share in late 2021 and as low as the mid-$20s in 2022 before stabilizing in the $35 to $55 range in 2024 and into 2025. That volatility explains why net worth estimates for Baszucki have ranged widely depending on when they were last updated.
The Roblox S-1 and subsequent DEF 14A proxy filings are the definitive sources for share counts. The 2025 proxy filing (dated May 29, 2025) includes a beneficial ownership table that shows Baszucki's direct shares, shares held through entities like the 2020 David Baszucki Gift Trust, and shares underlying stock options exercisable within 60 days. All of these count toward beneficial ownership calculations and feed into any credible net worth estimate.
David Baszucki's estimated net worth: the range and what moves it
As of March 2026, the most credible estimates put David Baszucki's net worth in the range of $3 billion to $4.5 billion, with Forbes showing an updated figure as recently as March 10, 2026. The wide range across sources reflects a few real variables: which share classes are included, whether vested but unexercised options are counted, whether any recent large share sales have been disclosed in Form 4 filings, and the RBLX stock price at the time of calculation.
The key drivers of his wealth are straightforward. He holds a significant block of Class B shares that convert to Class A shares on a one-for-one basis, so their economic value mirrors the Class A market price. He also holds Class A shares directly and through affiliated trusts. His founder status means he received early equity at a negligible cost basis, so essentially the full market value of his holdings translates to net worth (minus any estimated tax liabilities on unrealized gains, which estimators typically do not subtract). Performance equity awards granted as CEO add incremental value over time.
Why do sources differ? Forbes uses a proprietary methodology that may cap or discount certain illiquid or restricted holdings. Other aggregator sites may use older share counts or outdated stock prices. Some estimates include disclosed philanthropic transfers (like the Gift Trust) while others exclude them. None of these are wrong per se, they just reflect different methodological choices, which is why treating any single number as exact is a mistake.
Erik Cassel's estimated net worth: a different and more complex picture
Erik Cassel's net worth is fundamentally different from Baszucki's in that it is a historical figure, not a live one. Because Cassel died in early 2013, he held equity in a private Roblox Corporation that had not yet gone public. Roblox did not IPO until March 2021, eight years after his death. Whatever equity Cassel held at the time of his death would have been private stock with a valuation based on Roblox's last funding round or internal 409A valuation at that time, which was a fraction of the eventual IPO value.
There are no current SEC beneficial ownership filings listing Erik Cassel or his estate as a beneficial owner of Roblox shares, based on the proxy filings available through 2025. This is consistent with what you would expect: any shares would have been transferred to his estate and potentially sold, transferred to heirs, or redistributed well before or around the IPO. Without public disclosure of those transactions, the exact financial outcome for his estate is not knowable from public sources.
Estimates of what Cassel's stake would have been worth at IPO are speculative but informative as a thought exercise. If he held a co-founder level equity stake similar in magnitude to Baszucki's at the time of the company's founding, and if that stake survived dilution to the IPO in some form through his estate, it would have been worth hundreds of millions of dollars at minimum at the 2021 reference price. But this is an estimate built on assumptions about dilution, estate management, and transfer decisions that are not publicly disclosed. Any site quoting a specific current net worth for Erik Cassel should be treated with significant skepticism.
What a combined net worth figure actually means (and doesn't)
Some searches for 'David Baszucki and Erik Cassel net worth' are really asking: what is the total wealth created by Roblox's two founders? That framing makes intuitive sense, but it bumps into a practical problem. Baszucki's net worth is a live, publicly trackable figure tied to a real-time stock price. Cassel's net worth is a historical question with no confirmed current answer. Adding them together would be mixing a real-time estimate with a speculative historical one, and the result would not be meaningful.
What you can meaningfully say is this: the founding of Roblox by both men created a company that, at its peak public market valuation in late 2021, was worth over $70 billion. Baszucki retained enough of that to place him comfortably in billionaire territory. Cassel's estate, depending on what equity remained in it through the IPO, would have also seen significant value from the same event. Together, they built something worth far more than either could have alone, and the public-market story of that wealth creation belongs to both of them, even if only one is here to see the live stock price.
How to verify and update these estimates yourself
If you want to build your own current estimate for Baszucki's net worth (or check whether any estate-related disclosures exist for Cassel), here is a practical workflow using entirely free, public sources.
- Go to the SEC EDGAR full-text search (efts.sec.gov) and search for 'Roblox' filings. Pull the most recent DEF 14A proxy filing and look for the 'Security Ownership of Certain Beneficial Owners and Management' table. This gives you Baszucki's disclosed share count by class as of the record date.
- Note the Class A and Class B share counts separately. Class B shares convert 1: 1 to Class A economically, so treat them as equivalent for a dollar-value calculation.
- Multiply total beneficial shares by the current RBLX closing price (available on any financial data site like Yahoo Finance or Google Finance). That gives you the equity market value component of net worth.
- Check EDGAR for any recent Form 4 filings under Baszucki's name. Form 4s disclose insider buy/sell transactions within two business days of occurrence. If he has sold a large block recently, your share count from the proxy may be outdated — adjust accordingly.
- Cross-reference your result against Forbes' most recently updated Baszucki profile, which reflects their own methodology. If your number is in the same ballpark, you have a reasonable estimate. Major divergence usually means a stock price difference or a recent large transaction.
- For Erik Cassel: search EDGAR for any beneficial owner disclosure that includes his name or estate. If none appear in the most recent proxy, that is itself informative and consistent with what you would expect given the timeline.
This workflow takes about 20 minutes and gives you a number grounded in primary source filings rather than aggregator guesses. The one thing it cannot capture is non-Roblox assets (real estate, private investments, cash), which are never publicly disclosed and which estimators like Forbes attempt to account for through their own research.
Comparing the two founders: key differences at a glance
| Factor | David Baszucki | Erik Cassel |
|---|---|---|
| Role at Roblox | Co-founder, CEO, Chairman | Co-founder, VP of Engineering |
| Current status | Active, public figure | Deceased (February 2013) |
| Public market participation | Yes — held RBLX shares through 2021 IPO and beyond | No — died 8 years before IPO |
| SEC beneficial ownership disclosures | Yes — reported in annual DEF 14A filings | None found in post-IPO filings |
| Net worth estimate type | Live, trackable via RBLX stock price | Historical/speculative only |
| Estimated net worth range (2026) | $3 billion to $4.5 billion | Not publicly determinable |
| Primary wealth driver | Class A and Class B RBLX equity, trusts, CEO equity awards | Pre-IPO equity stake (estate disposition unknown) |
Why these numbers change over time, and how accurate are they really
Baszucki's net worth estimate is almost entirely a function of where RBLX stock is trading on any given day. A 20% move in the stock price translates directly to a similar percentage move in his estimated net worth. That is why the same person can appear worth $4 billion in one quarter and $2.5 billion in another without doing anything different personally. The company's earnings results, macroeconomic conditions, interest rate expectations, and user growth metrics all affect the stock price and therefore the estimate.
There is also a structural limitation in these estimates worth acknowledging. Proxy filings are typically published once a year and reflect ownership as of a specific record date, not today. Form 4 filings update the picture more frequently but only when transactions occur. That means at any given moment, the share count you are using may be weeks or months old. Combine that with daily stock price movement and you understand why a credible estimate is always a range, not a single number.
For research purposes, the most reliable approach is to treat these estimates as directionally accurate within a range: Baszucki is a billionaire whose wealth is primarily in RBLX equity, and the current market value of that equity is publicly determinable within a reasonable margin. What is not determinable is the full picture of any private holdings, family trusts not required to be disclosed, or philanthropic transfers that reduce his net economic position. Net worth figures on this site and elsewhere are estimates built from public information, not audited financial statements, and should be read in that spirit.
If you want to track these numbers going forward, setting a Google alert for 'Roblox DEF 14A' will notify you when a new proxy is filed (typically in the spring each year). Pairing that with a Form 4 alert for 'David Baszucki Roblox' on the SEC EDGAR alerts system gives you a near-real-time update whenever his ownership position changes. That is the most reliable self-service approach available without paying for institutional-grade equity research.
FAQ
Why do Baszucki net worth numbers swing so much quarter to quarter?
Yes, any current “net worth” number is sensitive to the RBLX share price you plug in. If you calculate it using yesterday’s price versus today’s, the estimate can change by roughly the same percentage because most of Baszucki’s value is tied to his Roblox equity, not cash or income.
When I estimate Baszucki’s net worth myself, what’s the most common calculation mistake?
Use the “beneficial ownership” table logic described in proxy filings, then convert Class B economic value to Class A market value (since the article notes one-for-one economic mirroring). Most mistakes come from valuing only the publicly traded Class A shares and forgetting the Class B vote-heavy block.
Do option-based holdings usually get counted in Baszucki net worth estimates, and how does that affect the range?
Look for two different things that both get counted in some estimates, shares underlying exercisable options (within the specified window) and vested-but-unexercised options. If you include options that some sources exclude, your number will come out higher, even if your share count for owned stock is correct.
How can I tell whether a published net worth estimate is using outdated filings?
Don’t treat the ranges as interchangeable. If an estimate is “as of” a specific date, and that date falls after a major price move or after new filings, you need to use that corresponding stock price. A stale share count combined with a current price can exaggerate or understate the value.
Why is it misleading to look for a “current” net worth for Erik Cassel?
For Cassel, the bigger issue is that “current net worth” is not the right framing because any Roblox equity would have been private at the time of his death and then became public only years later. Without publicly available estate transaction details, you can only model scenarios, not compute an auditable current figure.
What red flags should I watch for when a website claims to know Erik Cassel’s net worth today?
If a site quotes a single precise Cassel net worth that sounds like a live valuation, treat it as speculative. The article explains there are no corresponding public SEC beneficial ownership disclosures for Cassel, so any precise number typically depends on unverified assumptions about estate holdings through IPO.
Is it valid to add Baszucki and Cassel net worth together for a “total founders wealth” figure?
No, adding Baszucki’s live estimate to Cassel’s modeled estimate usually produces a number that is not meaningful. You would be mixing a real-time market-priced equity value for Baszucki with a historical, assumption-driven valuation for Cassel’s estate.
What parts of net worth are hardest to verify from public sources, even if the Roblox stake is clear?
Private investments and other non-Roblox assets can matter, but they are hard to quantify from public filings. Even if two sources agree on the Roblox equity valuation, their totals can differ because they either estimate or omit non-Roblox holdings and any offsetting liabilities.
What’s a more reliable way to track changes than just watching RBLX stock price?
For practical tracking, use SEC EDGAR Form 4 updates for changes in Baszucki’s holdings and pair them with the annual DEF 14A schedule so you know when the disclosed beneficial ownership snapshot refreshes. This helps you separate “stock price movement” (which changes everything daily) from “share count change” (which should change the value picture only when transactions occur).
Can trusts or estate structures change how different sites report Baszucki’s net worth?
Yes. Baszucki’s estate-related structures, like trusts mentioned in the article, can affect how certain aggregators present ownership and how they treat distributions or transfers. That means two sources can both be “right” on the underlying securities while disagreeing on how they describe or adjust net economic position.
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