Cliff Asness spent three decades irritated by a math problem: rich people were losing more to the IRS than they were gaining from their stock pickers. Then he sold them a fund that manufactures losses on purpose.
That is how AQR Capital Management became the world’s largest hedge fund by the end of 2025, surpassing $140 billion by the end of March, according to Bloomberg’s Big Take reporting published August 3, 2026. The longer version is a corporate turnaround built on a product almost no one else was selling.
Obsession Started in 1993
One year into his Wall Street career at Goldman Sachs (NYSE:GS | GS Price Prediction), Asness read a 1993 financial journal article co-authored by Rob Arnott arguing that investors typically lose more money to taxes than they gain from beating the market. He never got over it.
He had the pedigree to act. Asness earned a doctorate at the University of Chicago Booth School of Business under Nobel Prize winner Eugene Fama, then built Goldman’s quantitative research desk before leaving with his team to launch AQR ahead of the firm’s late-1990s IPO. He is now 59 and sits atop a $4 billion fortune per the Bloomberg Billionaires Index, a comic-book collector with Captain America’s shield tattooed on his arm.
Decline Nearly Ended the Story
AQR thrived until the 2008 financial crisis, incurred losses, rebuilt, and by 2017 ranked as the world’s second-biggest hedge fund firm. Then the quant trade broke. Asness kept buying cheap stocks that kept getting cheaper. He called the market “irrational”. Clients called their lawyers. AQR cut staff and total assets tumbled below $100 billion by 2022.
Discovery Came From Envy
The rescue, portfolio manager John Huss later said in a webinar, had elements of happenstance. AQR executives were co-invested alongside pensions and endowments in the firm’s strategies, but unlike those tax-exempt clients, the partners owed the IRS every April. They started asking whether there was a way to fix that .
The academic scaffolding arrived in the 2020 Financial Analysts Journal paper “The Tax Benefits of Separating Alpha from Beta,” by Joey Liberman, Clemens Sialm, Nathan Sosner and Lixin Wang. Its argument: a long-only manager pays taxes on both market gains and skill, while a market-neutral book, longs plus shorts, only pays taxes on the skill part, freeing the shorts to churn out realized losses.
Asness marked the paper’s arrival in a January 2021 post titled “Now There’s Nothing Certain But Death,” writing that “For almost my entire career I’ve been vexed that investments for taxable investors didn’t focus enough on after-tax returns, and many taxable investors didn’t seem to care.” He called the launch “a little bit of a ‘if we build it, they will come’ venture.” Nobody noticed.
Losing Money Became the Product
Traditional tax-loss harvesting sells a loser and swaps in something similar to bank the write-off. AQR’s version adds shorts and leverage so a portfolio can grow in value while spitting out losses far larger than the money invested. Those losses offset capital gains, and in some structures, ordinary income.
The pitch that eventually broke through, per Bloomberg: invest $100 million in the most aggressive of AQR’s Flex strategies, wait 10 years while the money triples, and over that period it may generate over $580 million of losses usable to erase taxes on other investments. Losses at almost six times the initial check, marketed as a feature. A second product Delphi Plus, caters to customers who want a steady stream of losses to shelter annual income, even wages, subject to the highest tax rates.
Word spread the old-fashioned way. In three years, assets in AQR’s long-short tax strategies jumped to about $70 billion from about $3 billion in 2023. Rob Arnott, whose 1993 article started the whole thing, now says: “The ‘wow factor’ on tax-loss harvesting, especially for long-short strategies, is quite impressive. Kudos to Cliff.”
Risk Sitting Under the Trophy
The legal footing remains uncertain. Treasury officials warned an industry seminar in New York in July 2026 that some new strategies produce outcomes Congress did not intend and are “potentially abusive,” and the Financial Times reported a Treasury warning to hedge funds over “tax alpha” strategies. There is no indication the IRS is looking at AQR, but the firm quietly stopped publishing figures showing how much its tax strategies were attracting and added a disclosure that the IRS could someday bar the benefits or even retroactively find them illegal, in which case “penalties may apply.”
Charles Schwab (NYSE:SCHW) and Fidelity are both limiting new accounts pursuing the strategy. Short sellers are wagering the government eventually cracks down. Asked privately whether Washington might object, Asness quipped: if you find $100, pick it up.
Version an Ordinary Investor Can Actually Use
This playbook sits out of reach for a retiree with a brokerage account. The minimums are institutional, the paperwork is bespoke, and two of the biggest custodians are already pulling back. What is squarely legal is smaller: harvesting losses in a taxable account against realized gains, using the $3,000 ordinary-income offset with carryforwards, favoring ETFs over mutual funds in taxable accounts to reduce distributions, and timing Roth conversions into years when the bracket has room (we mapped nine of the quiet IRS rules that drain retirement accounts in a free guide here: The Retiree’s Tax Trap Map). The billionaires are chasing zero. Retirees mostly just need to stop leaving money on the table.
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