Vanguard's share of US fund assets has stopped climbing for the first time in the firm's 50-year history, stuck at 27%.
Jack Bogle predicted this exact moment. In 1991, Vanguard's late founder said he'd know his mission was succeeding once competitors got so cheap that Vanguard itself started losing market share.
"Only a maniac."
Eric Balchunas is Bloomberg Intelligence's senior ETF analyst, wrote the book "The Bogle Effect," and used to visit Bogle in his office to talk about what Vanguard had become.
I listened to the full episode so you can skip it. 24 minutes of audio, 8 minutes of reading.
Here are the 6 numbers that matter.
👤 Guest: Isabelle Lee, a cross-asset reporter at Bloomberg News
🎙️ Hosts: Joel Weber and Eric Balchunas, who host Trillions (Balchunas is Bloomberg Intelligence's senior ETF analyst and author of "The Bogle Effect")
📰 Published: 10 September 2026
🔴 YouTube | 🟣 Apple Podcasts | 🔗 Show notes | ⏱️ 24 min | ✅ Time saved: 16 min
Key Takeaways
Vanguard's market share has stopped growing for the first time in 50 years, plateaued at 27%
Bogle called this outcome a sign of success back in 1991
The first index fund launched charging 43 basis points — not the near-zero fee people assume
It took the mutual-ownership structure decades of profit-driven votes to cut that to single digits
Flows barely moved for 20 years; 99.8% of index funds' $22 trillion arrived after 1995
Three things hit together around 2008: sub-10bp fees, the financial crisis exposing active managers, and the spread of the internet
Fidelity's cheapest index fund now undercuts Vanguard, charging one basis point on $850 billion
Vanguard still holds 27% of fund assets but only 5-6% of the industry's revenue
The "Jack Bogle paradox": the cheaper the core gets, the more exotic everything built around it becomes
Balchunas ties today's wave of speculative ETF launches directly to this effect
Balchunas thinks Bogle needed the 1960s market crash to become who he became
He doubts the same philosophy would have taken root in a bull market
1. The Plateau Bogle Predicted
Joel Weber opened by noting that Vanguard had just marked the 50th anniversary of its first index fund — and that its market share has stopped climbing at the same moment.
For 50 straight years, Vanguard's share of US fund assets climbed without interruption, then leveled off. Balchunas found it while pulling a routine chart for an anniversary note: "For 50 years, Vanguard's market share went up and up and up and up till they commanded 27% of all fund assets," covering ETFs and mutual funds together, before it "kind of leveled off and it even trickled down a little"
BlackRock and Fidelity are the ones picking up share now, alongside a long tail of other issuers offering their own cheap products
Bogle himself predicted this, in Balchunas's telling of his book research. He said Bogle had once written that he'd know his and Vanguard's mission was "beginning to be realized" once the firm's own market share started eroding — a claim Balchunas calls "insane to say in 1991"
Weber's framing question drew the episode's sharpest line. Asked who roots for their own company to lose market share, Balchunas answered in three words: "Only a maniac." He called addition by subtraction — not the index fund itself — Bogle's real life's work
2. He Wanted "Enough"
Balchunas opened and closed the episode with the same memory: visiting Bogle's office roughly a decade before his death.
Bogle displayed his own book next to a jab at excess. He kept a framed picture of his book, Enough, and put Donald Trump's book, Never Enough, beside it — visibly proud of the contrast
He questioned Vanguard's own size to Balchunas's face. "Can you believe we have $4 trillion in assets? What in the hell do we need all that money for?"
Balchunas contrasts that with how everyone else on Wall Street is wired. "I do think that 99.9% of people who go to Wall Street are like, hey, how can we make more money? How can we get more assets? That's just how you're taught to do it. That's how people are programmed"
He calls Bogle's real project "addition by subtraction," and traces the same idea into a comparison he and Weber have written about before: Bogle as punk rock. Strip out distribution fees, strip out trading costs from turnover, strip out the broker, strip out the investor's own worst behavioral instincts — "it's really about addition by subtraction," not the index fund as a product
3. The Backyard Fund
Weber asked how radical the first index fund actually was when it launched in 1976. Balchunas traced its origin to a moment of necessity rather than vision.
The idea came from an economist's dare in a trade journal, not from Bogle. Paul Samuelson had written that someone should launch an index fund so investors could finally grade active managers against it. Bogle, whose newly formed Vanguard was barred from running money after a falling-out with his old firm, realized an index fund wasn't "running money" at all — so he could do it
The genuinely radical part wasn't the index — it was refusing to pay a broker to sell it. At the time it was standard to pay a distribution load, and without one, brokers had no incentive to put clients into the fund. Bogle built it outside that system entirely
Balchunas's own metaphor for the bet Bogle was making: "let's say, Isabel made the greatest movie ever made, like something like as good as The Odyssey or whatever. But she would not show it in any movie theater...You had to go to her backyard to watch it" — and, he added, that movie better be good
4. Twenty Years Nobody Cared
Isabelle Lee raised a detail from her own reporting: the fund launched expensive, not cheap, and stayed largely ignored for two decades even as the fee came down.
The first index fund charged 43 basis points at launch — high by today's standards, and it wasn't until Vanguard cut it to roughly 2bps, and eventually 1bp, that assets really showed up. "People don't know that it started life at 43. They think it was born at like five and it just wasn't"
The mechanism was Vanguard's mutual-ownership structure, not a strategic price war. Every time the fund earned extra profit, its board — made up of the fund's own investors — voted to cut fees rather than spend the money on marketing or executive pay, pulling it from 43 to 40 to 35 and, by the 1990s, to 20 basis points
For most of that stretch, nobody noticed. "Index mutual funds have $22 trillion in assets. 99.8% of their assets have come in after 1995." That means the fund spent its first 20 years gathering just 0.2% of the assets it holds today
Three things converged around 2008 to change that. Fees dropped below 10 basis points, making the fund essentially free; active managers failed to sidestep the financial crisis, undercutting the case for paying them; and the spreading internet made cost and long-term-return data suddenly easy to find. "Those three things all kind of hit and kicked in around 2008, 2009. And that's when you see the index assets go parabolic"
5. The Chicken In Costco
Weber turned the conversation to why, exactly, Vanguard's growth has stalled — and Balchunas answered with a rival's own numbers.
Fidelity, once Vanguard's biggest 1980s-era rival through active funds like Magellan, now competes by underpricing Vanguard directly. "Fidelity, their biggest fund today is the Fidelity 500 Index Fund that charges one basis point, has $850 billion" — four times the size of any other fund Fidelity runs. Fidelity has taken to advertising that it is cheaper than Vanguard
Balchunas compares the cheapest index funds to a loss leader. "I agree. It's like the chicken in Costco, right? $5 rotisserie chicken," Weber offered, and Balchunas agreed: the fund can't get more expensive or much cheaper — it just has to exist as a draw
The strategy for everyone but Vanguard is to use the cheap fund to sell something else — a brokerage platform, an advisory service, or pricier "satellite" positions once a client is in the door
Being cheap has a real cost: Vanguard captures 27% of fund assets but only 5-6% of the industry's revenue, which Balchunas called "mind-blowing" and ties directly to the firm's own complaints about thin customer service and long support lines
He named the tension driving new product launches across the industry the "Jack Bogle paradox." The cheaper and more dominant low-cost passive investing gets, the more exotic the products built around its edges become — speculative "cowboy account" ETFs aimed at younger investors chief among them
6. Could Bogle Be A Millennial
Isabelle Lee asked whether Bogle's ethos could have taken root in a different era — specifically, whether a version of him launching a fund today would have succeeded.
Balchunas thinks Bogle was wrong for Wall Street from the start. "I just think Jack Bogle was miscast on Wall Street. I just think he probably would have made a better preacher, maybe even like an actor" — someone driven more by adoration than money, evidenced by a detail from his son: he wore the same khakis for like 40 years
The philosophy, in his view, required the specific shock of the 1960s market collapse. Bogle restarted his career in the early 1970s carrying the lessons of that crash, and Balchunas doubts the same instinct would have formed inside a runaway bull market instead
He draws the closest modern parallel to Amazon, not another asset manager — a company people trust to make something cheap, fast, and good enough that competing with it is difficult
Bonus Insights
The "Bogle Effect" title was a business call, not just a branding choice. Balchunas said he could have sold "like five times more copies" calling it "The Vanguard Effect," but most people mispronounce Bogle's name as "Boggle" — like the board game — so he built the book around the man's actual name instead
Isabelle Lee compared Bogle's ambition for the whole industry to be low-cost forever to the dating app Hinge, whose motto is that it's "designed to be deleted" — questioning whether an industry, like a dating app, ever really wants to succeed itself out of existence
A running bit about generational music gaps closed out the episode. Lee had never heard of the Ramones, prompting Weber and Balchunas to promise her a "20th-century playlist" after she recognized Green Day but not the band it borrowed its sound from
Balchunas's bottom line is that Vanguard's stalled growth isn't a warning sign — it's the scoreboard Bogle set up decades ago finally reading the way he wanted it to.
Books & Resources Mentioned
The Bogle Effect – Eric Balchunas (His book on Jack Bogle's influence, and the reason he says he chose Bogle's name over Vanguard's for the title)
Enough – Jack Bogle (The book Bogle kept framed in his office, next to a copy of Donald Trump's "Never Enough")
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