What Is an Alternative Trading System (ATS)?

An alternative trading system (ATS) is a trading venue that is more loosely regulated than an exchange. ATS platforms are often used to match large buy and sell orders among its subscribers. The most widely used type of ATS in the United States are electronic communication networks (ECNs)—computerized systems that automatically match buy and sell orders for securities in the market.

Understanding an Alternative Trading System (ATS)

ATS account for much of the liquidity found in publicly traded issues worldwide. They are known as multilateral trading facilities in Europe, ECNs, cross networks, and call networks. Most ATS are registered as broker-dealers rather than exchanges and focus on finding counterparties for transactions.

Unlike some national exchanges, ATS do not set rules governing the conduct of subscribers or discipline subscribers, other than by excluding them from trading. They are important in providing alternative means to access liquidity.

Institutional investors may use an ATS to find counterparties for transactions, instead of trading large blocks of shares on national stock exchanges. These actions may be designed to conceal trading from public view since ATS transactions do not appear on national exchange order books. The benefit of using an ATS to execute such orders is that it reduces the domino effect that large trades might have on the price of an equity.

Criticisms of Alternative Trading Systems (ATS)

These trading venues must be approved by the SEC. In recent years, regulators have stepped up enforcement actions against ATS for infractions such as trading against customer order flow or making use of confidential customer trading information. These violations may be more common in ATS than national exchanges because ATS face fewer regulations.

Dark Pools

A hedge fund interested in building a large position in an equity may use an ATS to prevent other investors from buying in advance. ATS used for these purposes may be referred to as dark pools.

Dark pools entail trading on ATS by institutional orders executed on private exchanges. Information about these transactions is mostly unavailable to the public, which is why they are called “dark.” The bulk of dark pool liquidity is created by block trades facilitated away from the central stock market exchanges and conducted by institutional investors (primarily investment banks).

Although they are legal, dark pools operate with little transparency. As a result, dark pools, along with high-frequency trading (HFT), are oft-criticized by those in the finance industry; some traders believe that these elements convey an unfair advantage to certain players in the stock market.

Regulation of Alternative Trading Systems (ATS)

SEC Regulation ATS established a regulatory framework for ATS. An ATS meets the definition of an exchange under federal securities laws but is not required to register as a national securities exchange if the ATS operates under the exemption provided under Exchange Act Rule 3a1-1(a). To operate under this exemption, an ATS must comply with the requirements in Rules 300-303 of Regulation ATS.

To comply with Regulation ATS, an ATS must register as a broker-dealer and file an initial operation report with the Commission on Form ATS before beginning operations. An ATS must file amendments to Form ATS to provide notice of any changes to its operations, and must file a cessation of operation report on Form ATS if it closes. The requirements for filing reports using Form ATS is in Rule 301(b)(2) of Regulation ATS. These requirements include mandated reporting of books and records.

In recent times, there have been moves to make ATS more transparent. For example, the SEC amended Regulation ATS to enhance “operational transparency” for such systems in 2018. Among other things, this entails filing detailed public disclosures to inform the general public about potential conflicts of interest and risks of information leakage. ATS are also required to have written safeguards and procedures to protect subscribers’ trading information.

The SEC formally defines an alternative trading system as “any organization, association, person, group of persons, or systems (1) that constitutes, maintains, or provides a market place or facilities for bringing together purchasers and sellers of securities or for otherwise performing with respect to securities the functions commonly performed by a stock exchange within the meaning of Rule 3b-16 under the Exchange Act; and (2) that does not (i) set rules governing the conduct of subscribers other than the conduct of such subscribers’ trading on such organization, association, person, group of persons, or system, or (ii) discipline subscribers other than by exclusion from trading.”

What Is an After-Tax Contribution?

An after-tax contribution is money paid into a retirement or investment account after income taxes on those earnings have already been deducted. When opening a tax-advantaged retirement account, an individual may choose to defer the income taxes owed until after retiring, if it is a traditional retirement account, or pay the income taxes in the year in which the payment is made, if it is a Roth retirement account.

Some savers, mostly those with higher incomes, may contribute after-tax income to a traditional account in addition to the maximum allowable pre-tax amount. They don’t get any immediate tax benefit. This commingling of pre-tax and post-tax money takes some careful accounting for tax purposes.

Understanding After-Tax Contributions

In order to encourage Americans to save toward their retirement years, the government offers several tax-advantaged retirement plans such as the 401(k) plan, offered by many companies to their employees, and the IRA, which anyone with earned income can open through a bank or a brokerage.

Most, but not all, people who open a retirement account can choose either of two main options:

• The traditional retirement account allows its owner to put “pre-tax” money in an investment account. That is, the money is not subject to income tax in the year it is paid in. The saver’s gross taxable income for that year is reduced by the amount of the contribution. The IRS will get its due when the account holder withdraws the money, presumably after retiring.
• The Roth account is the “after-tax” option. It allows the saver to pay in money after it is taxed. That is more of a hit to the person’s immediate take-home income. But after retirement, no further taxes are owed on the entire balance in the account. The Roth 401(k) option (referred to as a designated Roth option) is newer, and not all companies offer them to their employees. Earners above a set limit are not eligible to contribute to a Roth IRA account.

Post-Tax or Pre-Tax?

The post-tax Roth option offers the attraction of a retirement nest egg that is not subject to further taxes. It makes the most sense for those who believe they may be paying a higher tax rate in the future, either because of their expected retirement income or because they think taxes will go up.

In addition, money contributed post-tax can be withdrawn at any time without a fat IRS penalty being imposed. (The profits in the account are untouchable until the account holder is 59½.)

On the downside, the post-tax option means a smaller paycheck with every contribution into the account. The pre-tax or traditional option reduces the saver’s taxes owed for the year the contributions are made, and it is a smaller hit to current income.

The downside is, withdrawals from this type of retirement fund will be taxable income, whether it’s money that was paid in or profits the money earned.

After-Tax Contributions and Roth IRAs

A Roth IRA, by definition, is a retirement account in which the earnings grow tax-free as long as the money is held in the Roth IRA for at least five years. Contributions to a Roth are made with after-tax dollars, and as a result, they are not tax-deductible. However, you can withdraw the contributions in retirement tax-free.

Both post-tax and pre-tax retirement accounts have limits on how much can be contributed each year:

• The annual contribution limit for both Roth and traditional IRAs is $6,000 for tax year 2022 (increasing to $6,500 in 2023). Those aged 50 and over can deposit an additional catch-up contribution of $1,000.
• The contribution limit for Roth and traditional 401(k) plans is $20,500 for 2022 (increasing to $22,500 in 2023), plus $6,500 for those age 50 and above.

Early Withdrawal Tax Penalty

As noted, the money deposited in a post-tax or Roth account, but not any profits it earns, can be withdrawn at any time without penalty. The taxes have already been paid, and the IRS doesn’t care.

But if it’s a pre-tax or traditional account, any money withdrawn before age 59½ is fully taxable and subject to a hefty early withdrawal penalty.

An account holder who changes jobs can roll over the money into a similar account available at the new job without paying any taxes. The term “roll over” is meaningful. It means that the money goes straight from account to account and never gets paid into your hands. Otherwise, it can count as taxable income for that year.

Special Considerations

As noted above, there are limits to the amount of money that a saver can contribute each year to a retirement account. (Actually, you can have more than one account, or a post-tax and a pre-tax account, but the total contribution limits are the same.)

Withdrawals of after-tax contributions to a traditional IRA should not be taxed. However, the only way to make sure this does not happen is to file IRS Form 8606. Form 8606 must be filed for every year you make after-tax (non-deductible) contributions to a traditional IRA and for every subsequent year until you have used up all of your after-tax balance.

Since the funds in the account are separated into taxable and non-taxable components, figuring the tax due on the required distributions is more complicated than if the account holder had made only pre-tax contributions.

What Is Add-On Interest?

Add-on interest is a method of calculating the interest to be paid on a loan by combining the total principal amount borrowed and the total interest due into a single figure, then multiplying that figure by the number of years to repayment. The total is then divided by the number of monthly payments to be made. The result is a loan that combines interest and principal into one amount due.

This method of calculating the payment on a loan is substantially more expensive for the borrower than the traditional simple interest calculation and is rarely used in consumer loans. Most loans use simple interest, where the interest charged is based on the amount of principal that is owed after each payment is made. Add-on interest loans may occasionally be used in short-term installment loans and in loans to subprime borrowers.

Understanding Add-On Interest

In simple interest loans, where the interest charged is based on the amount of principal that is owed after each payment is made, the payments may be identical in size from month to month, but that is because the principal paid increases over time while the interest paid decreases.

If the consumer pays off a simple interest loan early, the savings can be substantial. The number of interest payments that would have been attached to future monthly payments has been effectively erased.

But in an add-on interest loan, the amount owed is calculated upfront as a total of the principal borrowed plus annual interest at the stated rate, multiplied by the number of years until the loan is fully repaid. That total owed is then divided by the number of months of payments due in order to arrive at a monthly payment figure.

This means that the interest owed each month remains constant throughout the life of the loan. The interest owed is much higher, and, even if the borrower pays off the loan early, the interest charged will be the same.

Example of Add-On Interest

Say a borrower obtains a $25,000 loan at an 8% add-on interest rate that is to be repaid over four years.

• The amount of principal to be paid each month would be $520.83 ($25,000 / 48 months).
• The amount of interest owed each month would be $166.67 ($25,000 x 0.08 / 12).
• The borrower would be required to make payments of $687.50 each month ($520.83 + $166.67).
• The total interest paid would be $8,000 ($25,000 x 0.08 x 4).

Using a simple interest loan payment calculator, the same borrower with the same 8% interest rate on a $25,000 loan over four years would have required monthly payments of $610.32. The total interest due would be $3,586.62.

The borrower would pay $4,413.38 more for the add-on interest loan compared to the simple interest loan, that is, if the borrower did not pay off the loan early, reducing the total interest even more.

When researching a consumer loan, especially if you have poor credit, read the fine print carefully to determine whether the lender is charging you add-on interest. If that is the case, continue searching until you find a loan that charges simple interest.

What Is an Anomaly?

In economics and finance, an anomaly is when the actual result under a given set of assumptions is different from the expected result predicted by a model. An anomaly provides evidence that a given assumption or model does not hold up in practice. The model can either be a relatively new or older model.

Understanding Anomalies

In finance, two common types of anomalies are market anomalies and pricing anomalies. Market anomalies are distortions in returns that contradict the efficient market hypothesis (EMH). Pricing anomalies are when something—for example, a stock—is priced differently than how a model predicts it will be priced.

Common market anomalies include the small-cap effect and the January effect. The small-cap effect refers to the small company effect, where smaller companies tend to outperform larger ones over time. The January effect refers to the tendency of stocks to return much more in the month of January than in others.

Anomalies also often occur with respect to asset pricing models, in particular, the capital asset pricing model (CAPM). Although the CAPM was derived by using innovative assumptions and theories, it often does a poor job of predicting stock returns. The numerous market anomalies that were observed after the formation of the CAPM helped form the basis for those wishing to disprove the model. Although the model may not hold up in empirical and practical tests, it still does hold some utility.

Anomalies tend to be few and far between. In fact, once anomalies become publicly known, they tend to quickly disappear as arbitragers seek out and eliminate any such opportunity from occurring again.

Types of Market Anomalies

In financial markets, any opportunity to earn excess profits undermines the assumptions of market efficiency, which states that prices already reflect all relevant information and so cannot be arbitraged.

January Effect

The January effect is a rather well-known anomaly. According to the January effect, stocks that underperformed in the fourth quarter of the prior year tend to outperform the markets in January. The reason for the January effect is so logical that it is almost hard to call it an anomaly. Investors will often look to jettison underperforming stocks late in the year so that they can use their losses to offset capital gains taxes (or to take the small deduction that the IRS allows if there is a net capital loss for the year). Many people call this event tax-loss harvesting.

As selling pressure is sometimes independent of the company’s actual fundamentals or valuation, this “tax selling” can push these stocks to levels where they become attractive to buyers in January.

Likewise, investors will often avoid buying underperforming stocks in the fourth quarter and wait until January to avoid getting caught up in the tax-loss selling. As a result, there is excess selling pressure before January and excess buying pressure after Jan. 1, leading to this effect.

September Effect

The September effect refers to historically weak stock market returns for the month of September. There is a statistical case for the September effect depending on the period analyzed, but much of the theory is anecdotal. It is generally believed that investors return from summer vacation in September ready to lock in gains as well as tax losses before the end of the year.

There is also a belief that individual investors liquidate stocks going into September to offset schooling costs for children. As with many other calendar effects, the September effect is considered a historical quirk in the data rather than an effect with any causal relationship. 

Days of the Week Anomalies

Efficient market supporters hate the “Days of the Week” anomaly because it not only appears to be true, but it also makes no sense. Research has shown that stocks tend to move more on Fridays than Mondays and that there is a bias toward positive market performance on Fridays. It is not a huge discrepancy, but it is a persistent one.

The Monday effect is a theory which states that returns on the stock market on Mondays will follow the prevailing trend from the previous Friday. Therefore, if the market was up on Friday, it should continue through the weekend and, come Monday, resume its rise. The Monday effect is also known as the “weekend effect.”

On a fundamental level, there is no particular reason that this should be true. Some psychological factors could be at work. Perhaps an end-of-week optimism permeates the market as traders and investors look forward to the weekend. Alternatively, perhaps the weekend gives investors a chance to catch up on their reading, stew and fret about the market, and develop pessimism going into Monday.

Superstitious Indicators

Aside from calendar anomalies, there are some non-market signals that some people believe will accurately indicate the direction of the market. Here is a short list of superstitious market indicators:

• The Super Bowl Indicator: When a team from the old American Football League wins the game, the market will close lower for the year. When an old National Football League team wins, the market will end the year higher. Silly as it may seem, the Super Bowl indicator was correct almost three-quarters of the time over a 53-year period ending in 2021. However, the indicator has one limitation: It contains no allowance for an expansion-team victory!
• The Hemline Indicator: The market rises and falls with the length of skirts. Sometimes this indicator is referred to as the “bare knees, bull market” theory. To its merit, the hemline indicator was accurate in 1987, when designers switched from miniskirts to floor-length skirts just before the market crashed. A similar change also took place in 1929, but many argue as to which came first, the crash or the hemline shifts.
• The Aspirin Indicator: Stock prices and aspirin production are inversely related. This indicator suggests that when the market is rising, fewer people need aspirin to heal market-induced headaches. Lower aspirin sales should indicate a rising market.