Kurt Brouwer August 31st, 2009
We have not written much about momentum investing, which is in its simplest form trend following. Take a given index such as the S&P 500 and track it over time. When it begins moving up, buy in. When it begins falling, sell.
George Soros and Reflexivity
Perhaps the most famous proponent of momentum investing or trend-following investing is George Soros. In his book, The Alchemy of Finance (Wiley Investment Classics), Soros wrote that markets are inherently reflexive.
That is, buying begets more buying until a peak is reached and then selling begets more selling until a bottom is reached. A market that is hot (say oil in early 2008) will continue to attract buyers who act under the belief that it will keep going higher and higher. A market that is cold (say financial stocks in January and February 2009) will continue to freeze out even the most patient buyers because most investors think it may keep going down. Of course, neither belief is correct. No market (such as oil) grows to the sky, but no market (such as financial stocks) falls to zero either. Beginning in March 2009, we saw the turnaround. All the sellers of financials had sold and some buyers came in. Over time, financials moved up, attracting more buyers and so on.
In other words, though we do not know how far stocks or commodities will fall, but eventually all the sellers will have sold and the bottom will have been reached. Then, inevitably, the market will rally. Similarly, at some point, the price of a stock or a commodity will falter due to a combination of weakening demand and increasing supply. Again, we do not know how far up it will go before that point is reached, but reached it shall be…
Now, Barron’s reports on a bevy of momentum-oriented mutual funds issued by hedge fund investor AQR.
Source: Barron’s
Preaching the Gospel of Momentum (Barron’s, August 21, 2020, Andrew Bary)
QUANTITATIVE INVESTMENT STRATEGIES ARE SHROUDED in mystery. Most investors don’t even try to understand them, and many practitioners won’t discuss them, fearing that doing so could cost them their competitive edge.
One of the largest firms in the field is AQR Capital Management of Greenwich, Conn. Founded in 1998, it oversees more than $20 billion, primarily for institutional investors. AQR, which stands for Applied Quantitative Research, seeks to use some of best ideas of academic finance in the real world. It applies its proprietary models across a range of assets, including stocks, bonds and currencies.
Backed by a wealth of historical data, the firm believes in often-derided momentum investing, which favors buying stocks that have been doing well, relative to their peers or the overall market, and avoiding those with poor price momentum. AQR calls momentum investing an “undiscovered style” and a better complement to value investing than growth-oriented strategies. The firm seeks to overweight cheap securities that have strong momentum and underweight expensive ones that have weak momentum. Unlike most investment managers, AQR employs no fundamental analysts to cover companies. Instead, it seeks to hone its quantitative models and develop new ones.
The firm last month started three momentum-oriented equity mutual funds.
The first, AQR Momentum (ticker: AMOMX), which invests in the third of the 1,000 largest U.S. stocks with the best total return over the preceding 12 months. It will be rebalanced quarterly. The other two funds, AQR Small Cap Momentum (ASMOX) and AQR International Momentum (AIMOX), are similar. The funds are up since their inception but trail the overall market.
Cliff Asness, one of the company founders described AQR’s general approach to investing this way in the Barron’s interview:
We use the best of modern portfolio theory techniques, not necessarily quantitative models, to help serve clients. It started back in 1994 when I was at Goldman Sachs, and they asked me to form a quantitative-research group. Where our process might have consisted of a few measures of value and price momentum 15 years ago, it now generally consists of many factors from more subtle measures of value and momentum to signals obtainable from the actions of management, short-selling activity and inventory changes for commodities. Our models form a diversified systematic opinion on what we like and don’t like in all liquid assets…
The problem with quantitative investment stratagies is that they are difficult to describe with any accuracy. And, they are not purely quantitative, that is computer or model driven. The managers still have a lot of leeway in what signals they follow and how they weight them.
I’m not knocking the momentum-investment approach because it makes use of very basic human psychology — the herd instinct. As such, it can be very useful. It will be interesting to see how well these momentum investing funds work.
Hat tip to Tadas Viskanta (Abnormal Returns) for helping me clarify the meaning of the last quotation.