Is Momentum a Dead Stock-Picking Factor?

Does momentum really work? Can you outperform benchmarks by simply holding top-performing securities? I have my doubts, but I’ve decided to be open-minded and revisit this idea.

A decade or two ago, we used momentum extensively to select equity asset classes and avoid the poor performers. I lost faith in momentum somewhere in the 2009 to 2010 time frame after the premium suffered a historically large drawdown in 2009.

We turn off momentum at the beginning of new bull markets, so we didn’t suffer from this drawdown, but hedge fund assets had grown exponentially to over $2 trillion at the time, and momentum mutual funds were being introduced. The strategy appeared to be very crowded.

Momentum was a great trading edge for many decades. Now it’s just too easy to do and too popular with an enormous amount of assets implementing momentum in various forms.

Let’s define the momentum effect. The idea is that top performing assets over a 3 to 12 month time frame tend to outperform over a similar time frame. Poor performing assets tend to underperform in the near future. Momentum is sometimes confused with trend following.1 Momentum ranks recent performance among peers, such as ranking U.S. stocks among each other, or U.S. sectors among each other, or individual country stock market indices among each other. Trend following looks at absolute prices and asks if prices are in an uptrend or downtrend, and shifts to cash or shorts an asset when prices are in a downtrend. Momentum indices remain exposed to falling prices, and thus can suffer large losses during bear markets. Long-short momentum portfolios can also suffer enormous equity-like drawdowns.

A typical momentum measure is 12-month performance, although the sweet spot look-back period can vary from 6 to 15 months. For really short time periods, one month or less, there’s a short-term reversal effect where top performers typically underperform during the next month. 2-4 As the look-back period extends beyond a few years, recent top performers begin to lag the averages in the future and the bad performers tend to do better as the latter are now underowned and better valued with higher expected returns. (more…)

Avoid Crowded Trades

iStock_38050578_XSmallPeriods of high volatility, sharp sell-offs and bear markets create an environment rich in trading and investment opportunities for those that remain level-headed and prepared. As prices recover and the next equity bull market develops, all risk-on trades generally work. Eventually the bull market ages, and finding new trading ideas becomes a bit more challenging.

Developing successful trades in this environment requires creativity and hard work, searching for ideas that are good, yet not so well known as to be crowded, and therefore ineffective. This is easier said than done. Most traders tend to pile into similar mid- and late-cycle trades, which are often marginal with respect to an edge, or tend to be based on economic predictions and/or secular themes rather than exploiting another group of investors.

When too many traders are in the same trade, it becomes crowded. As you might expect, crowded trades lose their edge, and thus should be avoided. That is a good rule to live by, but even the best portfolio managers will occasionally join the crowd due to an extremely high conviction level associated with a trade. An asset class trader must then be aware that the price action associated with the trade will change when there are lots of fellow portfolio managers in the mix.

The concept of crowded trades has become standard trading lingo, much more so than it was 10 to 15 years ago, likely due to the growing popularity of hedge funds over that time period.1,2,3 Yet as far back as the 1960s, crowded shorts were a problem for hedge fund managers.4 In periods of limited opportunities, traders often read similar research reports, are attracted to the same outperforming assets, and in general, lack sufficient imagination to develop a new trade idea. In addition, larger hedge funds tend to implement global macro and asset class level trades due to capacity constraints.

Definition of a Crowded Trade

Whenever there’s too much money or too much attention showered on an asset type, you should expect lower returns, or losses in the case of a trade.

Pundits and fund managers throw around the crowded trade language all the time, often to justify their own positioning. (more…)


iStock_000085081023_SmallIn this blog I’ll examine the old “sell in May and go away” seasonal pattern associated with risky assets. It’s timely to consider this pattern since the markets are now entering the seasonally weak period. Furthermore, stock market performance has been relatively weak in a number of recent “strong periods,” such as in January 2016, November 2015 through January 2016, and November 2015 through April 2016, which often provides a foreboding tell of additional weakness during the traditional seasonal weak period of May through October.

Seasonality as a trading edge is also worth considering because trend following has become very trendy these days, with billions of dollars flowing into this discipline every year via managed futures funds. The problem with these flows is that the effectiveness of trend following diminishes as more assets are devoted to the discipline, since trend following is naturally capacity constrained due to high turnover (>200%) and the liquid demanding nature of trading. It seems that trend following is crowded.

At this point in time, it may be interesting to examine other market timing signals as an alternative way to add and reduce risk exposure. One such approach is seasonality, which is probably underutilized by the asset class trading community and thus might be more effective than trend following over the near term.

The seasonal pattern has been well known for decades – the stock market’s best period is from November through April, and its poor-performing period is from May to October. This is not the case every year, but on average this seasonal pattern has held up really well with stock markets around the world for decades.

Academics call this pattern the Halloween effect since the buy signal is generated by buying at the close on October 31 every year and the sell signal is on every April 30. What’s amazing is that seasonality has not been arbitraged away, even though the cost of implementing a seasonal trading system has been low since the 1980s. The old adage of “sell in May and go away” still works! (more…)

Stale Pricing

iStock_000016105828_XSmallA stale pricing edge occurs when a security or fund can be purchased or sold at a price that is stale with respect to current up-to-the-second information. This trading edge is as fleeting as a twenty dollar bill sitting on a busy sidewalk. For instance, if the price of a U.S. equity closed-end fund is sitting at bid $10, ask $10.10 for most of the day without trading activity, and the S&P 500 trades up 2% during the day, the ask price of $10.10 may be too low, and therefore, stale. Then buying at the bid can provide a risk-free profit (if hedged by an S&P 500 short) of at least 10 cents, since the fund should be trading at $10.20/$10.30.

You’ll never find stale prices with liquid large cap equities or ETFs. Only rarely do they occur with securities that don’t trade very often, such as closed-end funds. The stale price edge is not backtestable with price data since simulated orders would have affected prices at the time.

Generally, we’d expect stale price opportunities to occasionally occur with illiquid stocks that trade with a wide bid-ask spread, with very little size offered. Stale prices may also emerge when transaction costs are high (perhaps due to a financial transaction tax), or when markets are highly volatile. In the heat of a stock market crash, when 10% up and down days are the norm, we’d expect a few stale price opportunities to emerge. Getting back to the U.S. equity closed-end fund discussed above, if the S&P 500 ramped 5% in the last hour of the day, and the closed-end fund lagged up only 2%, then perhaps that’s an opportunity to buy at the ask, and expect its price to eventually catch up (possibly the next morning).

Funds are the bread-and-butter tools for asset class traders – ETFs, ETNs, closed-end funds, open-end funds, limited partnerships, etc. There are stale pricing opportunities that can occur with investment funds from time to time.

Most notable was the stale pricing associated with open-end mutual funds. This advantage is no longer available today, but it represented a structural edge from the 1980s to the early 2000s. In his book The New Market Wizards, Jack Schwager profiled one trader, Gil Blake,1 who used this edge in the 1980s to produce an annualized return of 45% per year over 12 years. Mr. Blake actively traded Fidelity sector funds to generate those returns, switching in and out of funds every day. Interestingly, he was unaware of why the strategy worked, when what he was doing was systematically exploiting stale pricing. At that time, mutual fund prices exhibited a daily serial correlation because many of the securities held in the fund had stale prices when used to calculate the daily close-of-business net asset value (NAV). (more…)

Top 10 Thought Leaders for Asset Class Traders

iStock_000077319945_XSmallThe beginning of the year marks the time when chief investment officers, market strategists and other chief prognosticators publish their top investment themes. Barron’s also publishes their much anticipated “round table” issues in mid to late January, which pull together top investors to discuss the state of the markets and where they see investment opportunities.

There are hundreds of firms producing research all the time, most of it free. The big Wall Street firms produce enormous amounts of content, but so do practically all buy-side investment management firms these days. If you’re not careful, combing through research reports for trading and investment ideas can absorb all of the day. There are also the independent firms such as Ned Davis Research, BCA Research and the Leuthold Group, which are very expensive, but provide lots of interesting and useful information for asset class traders.

Common sense suggests that you can’t just read the research, implement the trades suggested and expect to outperform the market. That would be too easy. This is the case even for costly research from the independents, because after all, tens of thousands of professional portfolio managers can afford these services.

For an asset class trader, reading research and market commentary is important, primarily so you understand what everyone else is thinking, become aware of crowded trades and estimate what information is already priced into the markets. Every once in a while, a new piece of information is gleaned or a new way of thinking about an asset class is found. If discovered ahead of most other market participants, this information can be the seed of a new trade.

Thought Leaders

At any point in time, there are industry thought leaders who seem to have a special knack for investing and trading the markets. When they speak, I pay careful attention because the probability of discovering a new trade idea from them is much higher than reading the everyday, run-of-the-mill content.

Generally, these thought leaders are very experienced, talented and rich. They’re not inhibited by career risk. Their motivations are aligned with us, because being right about an investment theme is the most important goal associated with speaking publically since the prediction is on the record. Contrast this motivation with that of research content providers and newsletter writers, where maximizing readership is the primary goal. (more…)

Does Technical Analysis Work?

iStock_000018222116_FullAn essential component of successful trading is having a good sense of timing. The standard industry tool for getting the timing right is technical analysis, so we need to examine its effectiveness. I’ll assume the reader is familiar with technical analysis, and as an asset class trader, I’ll also assume we control a limited amount of assets such that positions can be bought and liquidated with minimal trading impact costs.

For extremely large asset management firms and hedge funds, technical analysis is not an available tool because all-in trading costs are prohibitively expensive with this approach. These firms are forced to use other approaches such as value investing, which is, ironically, a horrible tool for timing price moves. Even large trend following CTAs are forced to use the most liquid futures contracts to minimize trading impact costs. So perhaps being small and using technical analysis is an advantage for us.

In a nutshell, technical analysis is the analysis of price and trading volume patterns to identify current and future price uptrends, downtrends and trend turning points. Practically all trading “how-to” books rely almost exclusively on technical analysis. Technical analysis techniques and patterns appear to be valid on all time scales and with any tradable security.

I gravitated to TA rather quickly when I first started trading, because as a full-time engineer, trading was a hobby. I didn’t have the time or expertise to dig through how the “fundamentals” influenced prices. I read many books on technical analysis and trading. The classic books are still the best,1-4 while most others fail to provide additional insight. In the next few blog posts I’ll talk about technical analysis, trend following and backtesting issues associated with mechanical trading models. Nowadays, I still look at charts and use basic technical analysis, but I don’t expect too much from it. (more…)