Graham Stephan Profile picture
Apr 27, 2022 11 tweets 4 min read Read on X
Index funds have been the safest investment option ever.

Except now, Michael Burry is saying there's an Index fund bubble.

Even Jack Bogle, the creator of Index Funds, warned against it!

Here's a breakdown of the bubble - and what it means for your money. 👇
What's an index fund? It's just a basket of stocks you can buy to diversify risk.

Instead of YOLOing on a stock you found on WSB, you can buy $SPY and own a piece of the top 500 companies in the market.

There's an index for everything - From Gaming to Cows to even Obesity!
But the better part is that while reducing risk, they are also very profitable.

95% of portfolio managers underperform $SPY over a 15-year period. Even Warren Buffett promotes $SPY over his own company!

The cash inflows to index funds have been skyrocketing for this reason.
But this popularity has caused two issues.

First, Price Discovery. People buy the basket without seeing what's in it. All assets in the basket get your money *automatically.*

This can lead to a bubble where buying leads to price rise which leads to buying.

Remember ARK ETF?
Second, Low Liquidity.

IF a large portion of investors sell off index funds - the smaller companies will get hit.

Take the Russell 2000.
Half the stocks have a trading volume of < $5M per day.
25% have < $1M per day.
A large sell-off would affect these companies the worst.
What does the data say though?

It seems like adding a stock to the index would make its price shoot up. It does - But only for a very short time.

There is usually a price rise in the week leading up to the inclusion, but no permanent effect.
Also, price is decided majorly by trading and not by fund inflow. 95% of trading volume is captured by active traders, not index funds.

The chance of a bubble is very low.
What about liquidity? In funds like $SPY, the larger funds are given more weight. $100 into $SPY would give $7 to $AAPL and 1.5 cents to $RL.

A sell-off would affect them proportionately, and it wouldn't be that catastrophic.
There's one concern. When you buy a stock, you get voting rights on it.

If the trend continues, 3 fund managers would dominate 81% of the voting control of every large US company.

But we're not in immediate danger... When's the last time *you* voted for a stock you own?
So we're not at risk of an Index Fund bubble anytime soon, and they're still a great investment.

If you want to dive deeper, here's the full post:
grahamstephan.substack.com/p/index-fund-b…

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More from @GrahamStephan

Dec 1, 2025
I sold my "forever home" in LA.

I bought it in 2020 planning to keep it for decades. Instead, I left it completely empty for 5 years.

I turned down ~$600,000 in potential rent.

Here is the math on why it’s now safer to earn $0 than to be a landlord in LA. 🧵 Image
This house is close to my heart.

I grew up on the same street as a child.

Jack and I started the Iced Coffee Hour podcast at this table, and we had no clue it would hit 1.5M subs one day: Image
That studio with a T-rex skull you saw in all my videos?

That was a bedroom I had drywalled and painted black. It's where I filmed every one of my videos for a long time.

But despite all that, I decided to sell... Image
Read 9 tweets
Oct 19, 2023
Investing won't make you rich.

Warren Buffet had "retired" even before he started Berkshire Hathaway.

Hear me out: Image
Sam Parr said this on David Perell's podcast last week:

"You should look at the habits of successful people before they got big.

A 13 year old basketball player should look at 𝘄𝗵𝗮𝘁 𝗟𝗲𝗯𝗿𝗼𝗻 𝗝𝗮𝗺𝗲𝘀 𝘄𝗮𝘀 𝗱𝗼𝗶𝗻𝗴 𝗮𝘁 𝟭𝟯, not what he’s doing today."

I agree.
A lot of beginners try to learn from Warren Buffett.

There's definitely value in understanding his principles for any investor.

But you need to understand 𝙝𝙤𝙬 𝙝𝙚 𝙜𝙤𝙩 𝙝𝙞𝙨 𝙨𝙩𝙖𝙧𝙩.
Read 12 tweets
Oct 4, 2023
The American Dream is dying.

In 2021, 60% of Americans couldn't afford a home. In just a year, it went up to 80%.

Now, the average American can't afford a house in 99% of the country.

Here's why it's getting harder to own a house: Image
LendingTree surveyed 2,000 US consumers about home ownership:

91% of people said owning a house was part of the American dream.

But 𝗺𝗼𝗿𝗲 𝘁𝗵𝗮𝗻 𝗵𝗮𝗹𝗳 thought they would never own one.
Housing prices are growing faster than wages in more than half the country.

The median house now costs $351k and needs an annual wage of $88k to afford it.

But the average American only earns $71k a year.
Read 14 tweets
Mar 16, 2023
GPT-4 is here.

Its abilities are mind-blowing – and can make you money: 🧵
GPT-4 has a capacity of 25,000 words for input and output, and can even take images as input.

Microsoft's Bing is running on GPT-4. It's now available without a waitlist.
If you want to develop websites and games, coding is no barrier.

GPT-4 can take in your instructions and spit out the final product. Here's an example of a Snake game made with it.

Read 16 tweets
Mar 15, 2023
FDIC insures bank deposits up to $250,000.

But what happens to your stocks if your brokerage fails? 🧵
Meet the SIPC.

The Securities Investor Protection Corporation (SIPC) insures up to $500,000 worth of stocks per brokerage account, per consumer.

Stocks have higher coverage than even bank deposits.
This doesn't mean that the SIPC can prevent your stocks from declining in value.

But if a brokerage goes bankrupt, they can prevent your stocks from going missing.
Read 10 tweets
Mar 12, 2023
1 day after Silicon Valley Bank's collapse.

These are the companies – and countries – that have been hit, and how they are reacting:🧵 Image
Roku had one of the biggest deposits in SVB of $487 Million.

This was 26% of its cash and cash equivalents. After declaring its exposure, its stock dropped by 3%. Image
Roblox Corp had $150 Million of its $3 Billion in cash and securities at SVB (5%).

Rocket Lab USA deposited about $38M in cash. (7.9% exposure)
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