Module 10: Stablecoins and Macro
ETFs and Institutional Flows
Chapter 8 of 12 · about 6 minutes
8.1 Bitcoin in a retirement account
Node's financial adviser, who had dismissed crypto for years, called with news. "We can now add a small Bitcoin allocation to your portfolio, through a regulated ETF in your normal brokerage account."
Node was surprised. "No wallets, no exchanges, no seed phrases?"
"That's what changed in 2024," said Hash later. "Spot ETFs connected bitcoin to the world of traditional investment accounts. They've become one of the biggest sources of demand, and their daily flows are now some of the most-watched numbers in crypto."
8.2 What a spot crypto ETF is
An exchange-traded fund (ETF) is a fund that trades on a stock exchange like a share. A spot Bitcoin ETF holds actual bitcoin, stored with a regulated custodian. Each ETF share represents a fraction of the bitcoin the fund holds.
In the United States, spot Bitcoin ETFs began trading in January 2024, and spot Ether ETFs in July 2024 (Module 1, Chapter 9). Similar products exist in other countries.
In September 2025, the SEC approved generic listing standards for commodity-based trust shares, letting exchanges list qualifying spot crypto ETPs without a separate rule change for each one. Spot products for other assets, such as Solana and XRP, followed. Some newer funds also use in-kind creations and redemptions, where authorised participants deliver or receive the underlying crypto rather than cash, and some have been structured to stake part of their holdings and pass through the rewards. The details and availability vary by issuer and jurisdiction, so check each fund's documents.
| Spot ETF | Holding crypto directly | |
|---|---|---|
| Access | Through a normal brokerage or retirement account | Exchange account and wallets |
| Custody | Handled by the fund's custodian | You or an exchange (Module 2) |
| Trading hours | Stock exchange hours | 24/7 |
| Fees | Annual management fee | Trading and network fees |
| Use in DeFi or for payments | No | Yes |
| Regulation and reporting | Like other regulated funds | Depends on jurisdiction |
8.3 How ETF flows work
ETF shares are created and redeemed by large financial firms called authorised participants.
When demand for an ETF rises:
- Investors buy ETF shares, pushing the share price slightly above the value of the bitcoin it holds.
- Authorised participants create new shares, and the fund acquires more bitcoin to back them.
- This is recorded as an inflow.
When demand falls:
- Investors sell, pushing the share price slightly below the fund's value.
- Authorised participants redeem shares, and the fund sells or releases bitcoin.
- This is recorded as an outflow.
So ETF inflows generally mean bitcoin is being bought for the fund, and outflows mean it's being sold.
Chapter 8 · How spot ETF flows work
Investors trade ETF shares whose price can drift from net asset value. Authorised participants arbitrage the gap: when shares trade above value they create new shares and the fund buys coins, an inflow; when below, they redeem shares and the fund sells coins, an outflow. Some inflows hedge a short futures position, so flows are not purely directional.
8.4 Why ETF flows matter
ETF flows can be large compared with other sources of supply and demand.
| Daily comparison (illustrative, BTC at $100,000) | Value |
|---|---|
| New bitcoin mined per day (Module 6, Chapter 7) | ~450 BTC, about $45 million |
| A strong day of ETF inflows | $500 million, about 5,000 BTC |
| Ratio | ETF demand of more than 10 times daily new supply |
On days of heavy inflows, ETFs absorb far more bitcoin than miners produce. On days of heavy outflows, they release supply into the market. This is why traders watch daily ETF flow data closely (Module 4, Chapter 15).
8.5 Not all inflows are bullish bets
Some ETF flows aren't directional bets at all.
The basis trade. As Module 7, Chapter 12 explained, futures often trade above spot. Some hedge funds buy spot ETF shares and short Bitcoin futures on regulated exchanges, earning the difference with little exposure to price direction.
| Leg | Position |
|---|---|
| Buy spot Bitcoin ETF | Long $100 million |
| Short regulated Bitcoin futures | Short $100 million |
| Net exposure to Bitcoin's price | Roughly zero |
| Return | The futures basis, for example about 8% annualised |
These trades show up as ETF inflows, but they aren't bets on Bitcoin rising. When the basis shrinks, these funds unwind, creating outflows that also aren't bearish bets. Public filings by institutional investors suggested that a meaningful share of early ETF holdings by hedge funds was linked to such trades.
"So I can't just read inflows as 'people are bullish,'" said Mint.
"Not entirely," said Hash. "Flows are real buying and selling of bitcoin. But the motives behind them vary."
8.6 Who's buying
| Buyer type | Typical motive |
|---|---|
| Individual investors via brokerages | Simple exposure without managing crypto |
| Financial advisers and wealth managers | Small allocations within diversified portfolios |
| Hedge funds | Directional trades, basis trades, and relative value |
| Pension funds and endowments | Long-term diversification, usually small allocations |
| Other ETFs and fund structures | Packaged products |
Many advisers frame crypto as a small portfolio allocation, often a few percent, to limit the impact of its volatility on the overall portfolio. The personal finance module explores allocation in detail.
8.7 Corporate treasuries
Some public companies hold bitcoin, and in some cases other crypto assets, on their balance sheets, sometimes raising money through new shares or debt specifically to buy more. This created a category of companies whose share prices largely track their crypto holdings.
| Supporters argue | Critics warn |
|---|---|
| Treasury reserves in a scarce asset protect against currency debasement | Buying crypto with borrowed money adds leverage to a volatile asset |
| Shareholders gain crypto exposure through familiar stocks | If share prices fall below the value of holdings, raising capital becomes harder |
| Large, long-term buyers reduce available supply | Forced selling in a downturn could add pressure to the market |
Some governments also hold bitcoin, mostly from seized assets, and a few have discussed or created strategic reserves.
8.8 Institutions and market behaviour
Institutional participation has changed crypto markets in several ways:
- Closer links to macro. Institutions manage crypto alongside stocks and bonds, using the same risk models (Chapter 1).
- Trading hours effects. ETF flows happen during stock market hours, so price action around the US market open and close can matter more.
- Possibly lower volatility over time, as larger, longer-term holders join, though crypto remains highly volatile.
- Changes in on-chain data, as coins move into custodial wallets (Module 6, Chapter 3).
8.9 Try it yourself
Find a site that publishes daily flow data for spot Bitcoin and Ether ETFs. Record the last two weeks of flows. Identify the largest inflow and outflow days, and compare them with Bitcoin's price moves and the futures basis on those days. Then check the annual fees of three spot Bitcoin ETFs available in your region, if any.
Key takeaways from this chapter
- Spot crypto ETFs hold actual crypto and let investors gain exposure through brokerage accounts.
- ETF inflows and outflows reflect creations and redemptions, which involve buying or selling the underlying crypto.
- ETF flows can be many times larger than daily new bitcoin supply.
- Some flows come from market-neutral basis trades, not directional bets.
- Buyers include individuals, advisers, hedge funds, and institutions, often with small allocations.
- Corporate treasuries holding crypto add demand, but also potential leverage and forced-selling risks.
- Institutional participation links crypto more closely to macro and changes trading and on-chain patterns.