Colt Technology Services is a large digital-infrastructure company with significant capital-markets connectivity across Europe, Asia, and major global financial centers. Website or institutional source

Pharo Management is a global macro investment firm with deep expertise in emerging markets. Website or institutional source

Pershing Square Capital Management is a concentrated public-equity manager with one of the most recognizable activist identities in the industry. Website or institutional source

Perceptive Advisors is a healthcare and life-sciences investment firm managing public equity, venture capital, credit, and capital-solutions strategies. Website or institutional source

Penso Advisors is a discretionary macro manager specializing in convex, limited-downside derivatives structures across liquid asset classes. Website or institutional source

PDT Partners is a quantitative manager with deep roots in statistical arbitrage. Website or institutional source

Parallax Volatility Advisers is a long-established specialist manager focused on options, volatility arbitrage, and related relative-value strategies. Website or institutional source

PanAgora Asset Management is a quantitatively oriented manager whose strategies span active equities, managed futures, diversified factor premia, defensive equity, and multi-asset investing. Website or institutional source

Palliser Capital is a London-based multi-strategy investment firm founded by former Elliott partner James Smith. Website or institutional source

OTCX provides multi-dealer execution workflow for OTC derivatives and structured products. Website or institutional source

Ospraie Management is a specialist investment firm focused on commodities, basic industries, and real assets. Website or institutional source

ORTEX provides market intelligence centered on real-time short interest, securities lending, cost to borrow, options, ownership, index-rebalance forecasts, trading signals, fundamentals, events, and market news. Website or institutional source

Ortec Finance provides asset-liability management, strategic asset allocation, scenario analysis, climate analytics, performance measurement, and risk technology for pension funds, insurers, sovereign institutions, asset managers, and wealth organizations. Website or institutional source

Orchestrade is a cross-asset trading, risk, portfolio-management, and operations platform used by hedge funds, asset managers, banks, private banks, and energy or commodity trading firms. Website or institutional source

Opus Fund Services is an independent administrator supporting hedge funds, private equity, private credit, venture capital, real estate, family offices, and other alternative structures. Website or institutional source

Options Technology is a specialist managed-infrastructure and market-data provider for the global financial sector. Website or institutional source

OpenYield operates in order management, execution workflow, liquidity access and trading-system integration. Website or institutional source

OpenBB is an open-source-rooted financial research platform that allows investment teams to combine external data, proprietary sources, analytics, dashboards, applications, and AI agents in a configurable workspace. Website or institutional source

OneTick, developed by OneMarketData, is an enterprise time-series platform for tick capture, historical and streaming analytics, market-data research, transaction-cost analysis, surveillance, and backtesting. Website or institutional source

OneChronos operates in order management, execution workflow, liquidity access and trading-system integration. Website or institutional source