How a Long Short strategy works
A Long Short strategy holds long positions in stocks it expects to rise and short positions in stocks it expects to fall, aiming to profit from both. Many go a step further and use leverage to hold more than 100% in longs, offset by the shorts, so net market exposure stays close to a normal portfolio’s.
The manager builds two books of stocks. The long book holds companies expected to outperform. The short book holds companies expected to lag, which the manager borrows and sells now, planning to buy them back later at a lower price.
Two numbers describe the result: gross exposure is the two books added together, and net exposure is the long book minus the short book. A strategy can run a large gross exposure, which gives it many positions to work with, while keeping net exposure close to the market’s.

Extension strategies (130/30)
The most common form is the 130/30, or “extension,” strategy. For every $100 invested, the manager holds about $130 in long positions and $30 in short positions. The $30 of short sales raises the cash to fund the extra $30 of longs, and together they leave net exposure at roughly $100, about the same as being fully invested in the market.
Those extra positions on each side are where the strategy tries to add value beyond a standard long-only portfolio.

Why investors use Long Short
Running positions on both sides of the market gives a manager more ways to express a view than owning stocks alone. In a tax-aware Long Short strategy, it also creates more chances to harvest a loss, because whichever way the market moves, some positions show a loss: the longs when it falls, the shorts when it rises.
Those losses can offset capital gains elsewhere, a source of tax alpha that makes the approach useful when an investor faces a large gain, such as from selling a business or trimming a concentrated stock position.
Long-short vs. long-only
A long-only portfolio can harvest losses only on the stocks it owns, and only when they fall. Adding a short book widens that pool, because short positions move to a loss when the market rises, exactly when a long-only portfolio has few losses to take. See Long Short vs. long-only harvesting for a closer comparison.
Risks
Long Short strategies carry risks a long-only portfolio does not. A short position can lose more than the amount put into it, because a stock it bets against can keep rising with no ceiling. Leverage magnifies both gains and losses.
The strategy also pays to borrow, both interest on the leverage and fees to borrow the shorted shares, which raises the return it has to earn to come out ahead. It demands active management, so it suits taxable, higher-income investors who understand and accept that profile. Vise, for example, monitors each portfolio and its extension size daily, scaling the extension up or down as the account moves.
How Vise approaches Long Short investing
Vise, an investment platform for financial advisors, runs a proprietary tax-aware Long Short strategy as a premium extension of its Direct Indexing. Security selection on both books comes from its quality, value, and momentum factor model. Three things distinguish the approach:
Both books harvest, every day
The optimizer checks long and short positions daily for harvestable losses, so harvesting continues in any market: the short book supplies losses when markets rise, the long book when they fall.
One account, one engine
Long and short positions live in a single separately managed account, run by the same optimization engine as Vise’s long-only Direct Indexing, with wash-sale checks that span every account in the client’s household.
Built around what a client already holds
A portfolio can be funded with cash, ETFs, or existing stock. Even a concentrated position can stay in place while a Long Short overlay is layered around it to generate offsetting losses without a taxable sale.
How much more can two-sided harvesting add? A long-only portfolio slowly runs out of losses to take: a loss can only come from a stock trading below what you paid for it, and after a few years of growth, most holdings sit well above that. A short book has no such limit, because short positions show losses when the market rises. Whichever way the market moves, something in the portfolio can be harvested, and year after year that gap adds up. The losses on the chart are not drops in the portfolio’s value. They are dips harvested along the way, while the portfolio itself can keep growing.

Source: Vise backtested simulations, 06/2005–06/2025. Hypothetical performance; does not reflect actual client accounts.
Say you invest $1 million. When a curve crosses the dotted line, the strategy has banked $1 million of tax losses, enough to offset $1 million of gains elsewhere. A long-only portfolio never gets there, because its harvest flattens out after the first few years. In Vise’s backtest, the 145/45 strategy crosses before year seven and keeps climbing. Long Short is built to break through that limit.
See how Vise runs a tax-aware Long Short strategy for advisors and their clients.
1. Gain or loss on a short sale is capital, and the wash-sale rule applies to short sales — IRS Publication 550, Investment Income and Expenses, "Short Sales" (IRC §§ 1233, 1091(e)). https://www.irs.gov/publications/p550
2. Capital losses offset capital gains — IRS Topic No. 409, Capital Gains and Losses (IRC § 1211(b)). https://www.irs.gov/taxtopics/tc409
3. A margined or short position can lose more than the amount deposited — FINRA Rule 2264, Margin Disclosure Statement ("You can lose more funds than you deposit in the margin account"); SEC, Office of Investor Education and Advocacy, "Stock Purchases and Sales: Long and Short." https://www.finra.org/rules-guidance/rulebooks/finra-rules/2264 · https://www.investor.gov/introduction-investing/investing-basics/how-stock-markets-work/stock-purchases-and-sales-long-and
4. Margin lending uses the account as collateral and exposes investors to larger losses — SEC, Office of Investor Education and Advocacy, "Margin Account"; FINRA, Margin Regulation. https://www.investor.gov/introduction-investing/investing-basics/glossary/margin-account · https://www.finra.org/rules-guidance/key-topics/margin-accounts
Vise AI Advisors, LLC ("Vise") is an investment adviser registered with the U.S. Securities and Exchange Commission (SEC). Registration of an investment adviser does not imply any specific level of skill or training and does not constitute an endorsement of Vise by the Commission. This material is proprietary and may not be reproduced, transferred, modified or distributed in any form without prior written permission from Vise.
All investing involves risk and past performance does not guarantee future results. References to expected returns and projections, and product display images are provided for informational and illustrative purposes only, and may not reflect actual outcomes. Due to the complexity of tax law, not every single taxpayer will face the situations described herein exactly as calculated or stated, i.e., the examples and calculations are intended to be representative of some, but not all, taxpayers. Since each investor’s situation may be different in terms of income tax, estate tax, and asset allocation, there may be situations in which the calculations or assumptions would not apply.
This material is prepared by Vise and is not intended to be relied upon as a forecast, research or investment advice, and is not a recommendation, offer or solicitation to buy or sell any securities or to adopt any investment strategy. Values herein are estimates and do not represent any guarantee of future revenue, assets or cash flows. The above proposal is non-binding and does not constitute a formal business agreement.
The opinions expressed are as of the date shown below and may change as subsequent conditions vary. The information and opinions contained in this material are derived from proprietary and non-proprietary sources deemed by Vise to be reliable, are not necessarily all-inclusive and are not guaranteed as to accuracy. As such, no warranty of accuracy or reliability is given and no responsibility arising in any other way for errors and omissions (including responsibility to any person by reason of negligence) is accepted by Vise, its officers, employees or agents. This material may contain ’forward looking’ information that is not purely historical in nature. Such information may include, among other things, projections and forecasts.
There is no guarantee that any forecasts made will come to pass. Reliance upon information in this material is at the sole discretion of the reader. This material is intended for information purposes only and does not constitute investment advice or an offer or solicitation to purchase or sell in any securities, or any investment strategy nor shall any securities be offered or sold to any person in any jurisdiction in which an offer, solicitation, purchase or sale would be unlawful under the securities laws of such jurisdiction. All investing involves risk, including loss of principal. No strategy ensures success or protects against loss.
Backtested Performance
Backtested performance represents hypothetical returns and does not reflect trading in actual client accounts. Back-tested performance also differs from actual performance because it is achieved through the retroactive application of portfolios designed with the benefit of hindsight. As a result, the portfolios used in the back-testing process may be changed from time to time and the effect on hypothetical performance results could be either favorable or unfavorable. As a simulation methodology, in general, backtesting has certain limitations. It does not involve or take into account financial risk and does not take into account that material and market factors may have impacted investment decision making, all of which can adversely affect actual trading results and performance. Back-tested performance also does not represent trading costs or the impact of taxes.
Tax liabilities will vary for each client and can result from various activities in taxable and tax-deferred accounts. These activities include, but are not limited to rebalancing of portfolios, any sale of securities, tax-loss harvesting, interest, dividends and capital gains from securities held in taxable accounts. There are also tax liabilities associated with distributions from tax-deferred accounts. Not all Vise clients follow Vise’s recommendations and depending on the unique and changing client and market situations, Vise or the primary adviser of the client may further customize a Vise portfolio for particular clients so that actual client accounts differ materially from those shown.
Further, simulated performance does not reflect the impact that economic and market factors might have had on the advisor’s decision making if the advisors were actually managing client money. As a result of these and other variances, actual performance for client accounts have been and are likely to be materially different and may be lower than the results shown in the back-tested performance.
Backtesting Methodology
The backtesting for Vise-managed strategies employs Vise’s security selection and weighting model based on financial data and prices, according to Vise’s proprietary methodology. Vise-managed strategies use a multi-factor approach to security selection and weighting based on securities’ size, volatility, relative price and profitability fundamentals. For each strategy, factor scores are calculated from a set of selected fundamental factors and combined to create a multi-factor score and universe rank for each security. This relative ranking drives security selection and weighting decisions. The simulated performance shown includes the reinvestment of dividends but does not reflect the deduction of investment advisory fees and other expenses. A client’s investment returns will be reduced by the advisory fees or other expenses it may incur. Fees are fully described in Vise’s Form ADV brochure.

