Polars 2.0, AI Tax, and Quant Insights: Oct 6, 2026

Today's Quant Briefing

Polars 2.0 Released: First-Class SQL Support and Streaming Engine Enabled by Default

On October 6, 2026, Polars 2.0 was officially released. This version elevates SQL to first-class support, surpassing DataFusion and DuckDB in the TPC-H/DS benchmark tests through optimizer improvements. Key changes include enabling the streaming engine and out-of-core (OOC) computation by default, significantly enhancing memory efficiency. Additionally, it introduces a Map data type and strengthens type checking to enforce strict mode, accelerating AI iteration feedback.

Polars is a critical data analysis tool widely used in the quantitative trading community, boasting over 40k stars on GitHub. ¹

Bridgewater Proposes 35% AI Tax to Fund Universal Ownership of Tech Giants

Bridgewater Associates, managing over $100 billion in assets, has released a policy paper led by Chief Investment Officer Greg Jensen and CEO Nir Bar Dea. The proposal argues that AI-generated work should not receive tax advantages over human labor. Tax revenues could be used to reduce worker taxes and support those displaced by automation. The paper suggests subjecting companies controlling approximately 5% of global AI computing power to reviews similar to those for systemically important financial institutions. It also recommends regular interviews with lab employees to mitigate risks, projecting $600 billion in funding by 2030. ⁶

Revere Fined $800k for Underwriting Foreign Small-Cap IPOs Linked to Pump-and-Dump Manipulation

Since 2022, the business involved over 40 major issuers primarily operating in Hong Kong and China. Some stocks experienced abnormal surges and crashes after listing, causing millions of dollars in secondary market losses.

Their method involved multiple unconnected accounts opening accounts on the same day, registering the same address, and exhibiting similar trading patterns. Eight accounts were allocated over $1.5 million in shares. The stock surged 318% on its first day of listing before closing down more than 50%. On that same day, eight individuals emailed from non-resident IP addresses requesting a full liquidation. ²

Polymarket and Kalshi in Talks with UK Regulators to Enter the UK Market

The UK Financial Conduct Authority (FCA) is maintaining contact with prediction market operators. Operators such as Polymarket and Kalshi have held discussions with London’s financial regulators to assess potential opportunities for conducting business in the country. These engagements are currently in the preliminary assessment phase. ³

The Trade Magazine Q3 Released Yesterday, Focusing on Fixed-Income Trading

On October 6, 2026, The TRADE Q3 magazine was launched. This issue is a fixed-income special, focusing on liquidity dynamics, market structure evolution, and technological innovation.

The cover features an interview with Kevin Flood, Head of Trading at Royal London, along with insights from Luke Mahon, Head of Trading at Azimut, and the Vanguard London Fixed Income team. It also includes State Street’s market outlook, the European ETF boom, the evolving role of FX sell-side brokers, and a survey on execution management systems.

The journal is available via paid subscription. You can subscribe via the following link. ¹

Big Tech & Industry Updates

Bloomberg Launches Automated Closing Price Trading for Japanese Government Bonds

Bloomberg has introduced an automated closing price trading process for Japanese Government Bonds (JGBs), completing its first fully automated trade. The process mirrors the BB3P reference rate, combining electronic market auctions with rule engines to support pre-set parameter routing. This aims to reduce manual intervention, minimize tracking error, and lower trading costs, serving as part of its global closing price trading strategy. ¹

Balyasny Promotes Star Stock Picker

Balyasny Asset Management has promoted portfolio manager Ilan Weiss to Co-Lead of Global Equities, making him one of the strongest stock pickers in this multi-strategy hedge fund, assisting in overseeing its largest investment strategy.

Balyasny manages approximately $31–37 billion, ranking it among the top global multi-strategy hedge funds alongside Citadel, Millennium, and Point72. ¹

Legendary Hedge Fund BlueCrest Experiences Wave of Departures

According to reports from October 6, approximately 10 portfolio managers and traders at macro hedge fund BlueCrest have left or are planning to leave, including interest rate trader Ben Turner, who became a partner at age 26. The departures are concentrated in the interest rate trading business.

BlueCrest, founded by Michael Platt, once managed over $35 billion in assets. In 2015, it returned external funds and converted into a family office.

After the transition, BlueCrest shocked the financial world with its impressive proprietary returns. Its 2025 return reached 73%, with a ten-year cumulative return of approximately 7,858%, earning it the nickname "the fighter jet among money printers." ¹

Quantitative Research

Weekly Long-Short Strategy Captures Retail Coordination Mispricing, Achieving 11.5% Annualized Alpha

Relying solely on social media sentiment cannot identify coordinated speculation prior to the internet era or its term structure differences. Using Roundhill MEME ETF holdings as labels from 2021–2023, a machine learning classifier was trained using only market and company-level data. Features were adjusted for historical availability to backtest scores back to 1926. Testing decile spread portfolios from 1963–2025 revealed that for large-cap subsamples, a five-factor model plus momentum generated an annualized excess return of 9.3% (t=5.9). Returns were concentrated in the first two weeks after selection and reversed within a month. Monthly rebalancing for the full sample reduced annualized excess returns to 2.2% (insignificant). After freezing the model in April 2023, the sample-out top 25 portfolios from 28 months showed annualized returns of approximately 130%–138%, a Sharpe ratio of 1.8–1.9, weekly turnover of approximately 21%–22%, and max drawdown of 37%–40%. The probability of members losing half their value within a year was 13.0%, higher than the 9.6% for the broader market. ⁸

Quant Career Advice

Should you include self-made game sales (thousands of copies) on your resume when applying for London Spring Weeks?

Spring Weeks are the first gateway into the UK financial industry. High performers typically gain priority or direct interview opportunities for Insight Weeks and Summer Internships, further striving for full-time offers post-graduation.

Here are tips from community members:

• Tailor to the Role: For Investment Banking and Sales & Trading (S&T), it is advisable to omit it unless framed as a quantitative or data analysis project. For FinTech or creative roles, highlight it boldly; sales of thousands of copies far exceed typical side hustles.
• Evidence of Experience: Some candidates included clothing resale and Instagram operation on their resumes. They received offers in interview rounds where these side businesses were discussed, demonstrating that side projects show they "don't just grind grades."
• Reframe the Narrative: Present game revenue as a financial story involving revenue, costs, and tax reporting.
• Adjust Placement: Since fresh graduates lack formal experience, this can also be placed in the "Interests" section.