How ETF Creations and Arbitrage Can Affect Component Stock Prices
Summary
The document explains a mechanism by which strong demand for an ETF can affect its underlying shares. When buyers create demand for ETF units, the fund sponsor or authorized participants may create units by purchasing the component stocks. That buying can put upward pressure on those stocks, particularly when the basket includes less liquid securities.
The effect on any individual stock is uncertain. Component shares have their own supply and demand, and their prices may fall even while the ETF attracts inflows. Differences between the ETF price and the value of its holdings create opportunities for arbitrageurs, who may trade the fund and some or all of its components, using creation or redemption to source or deliver shares. These trades can help keep ETF prices aligned with their holdings, and the creation process can also support basket trading. The explanation is qualitative: it provides no measured estimate of price impact and does not specify when flows will dominate other market forces.
Key ideas
- ETF demand can lead authorized participants to create units by buying underlying shares.
- Purchases for the creation basket may put upward pressure on component stock prices.
- Flows do not determine every component's direction because each stock has independent supply and demand.
- Arbitrageurs trade ETF units against component shares to address price differences.
- Creation and redemption can facilitate trading in baskets of underlying shares.
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Full text
# Does inflows to ETF affect equity prices? # Does inflows to ETF affect equity prices? I’m wondering if significant asset inflows to an ETF affect its underlying stocks. For instance, ARK disruptive innovation ETF have seen significant inflows in the past 3 months, around $7 billion. Also, the ETF holds many micro and small cap stocks. Hence, does the significant inflows affect the market prices of the underlying equity securities directly or indirectly? ## Answer by AlRacoon (score 4) https://quant.stackexchange.com/a/60148 Most likely. If the ETF has more buyers than sellers, the sponsor or authorized participants will have to create units of the ETF. In order to create units of the ETF, they will have to go to the market to purchase the underlying shares. More buying of the shares tends to make the share price increase. Edit: I say most likely because the ETF and the underlying shares have its own liquidity characteristics. The theoretical ETF value is the weighted average sum of the component shares. If despite the demand for the ETF, there is selling of an individual stock, a particular stock price may go down. Consequently, the ETF may trade at a discount or premium to it's underlying share values. There are market participants that play this ETF arbitrage. They will buy (sell) the ETF if it is trading at a discount (premium) and sell (buy) the underlying components in an attempt to capture the discount or premium. Some arbitrageurs will make this trade utilizing statistical arbitrage and not buy or sell the complete basket of underlying stocks. The statistical arbitrageurs (and full replicators) will use the creation/redemption process to create the ETF or break up the ETF for the underlying components should they want to sell or source the underlying shares. They may then buy or sell the remaining shares (the tail) in the open market. The arbitrageurs help keep the ETF and the underlying shares to trade in line with each other. In fact, the ETF market is now used to facilitate basket underlying trading through the redemption/creation process.
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This summary was written by Stratmill's research agent from the original; it is not a copy of the source.