The equity ecosystem — sell-side, buy-side, alts

Around any listed equity sits an ecosystem of institutional participants, each with a distinct role: investment banks producing research, asset managers running long-only money, hedge funds running long-short or specialised strategies, activists pressuring management, ETF sponsors providing access, prime brokers servicing the funds, and corporate-services teams handling the listed company's interface with all of them. A serious analyst should hold a working map of this ecosystem.

Sell-side research

Sell-side equity research is produced by investment banks and broker-dealers to support trading, banking, and client relationships. Equity analysts cover specific companies (typically 10-25 names per analyst), publish notes following earnings and material events, and make calls (buy, hold, sell). The largest sell-side franchises (JPMorgan, Goldman Sachs, Morgan Stanley, Bank of America, Citi, Barclays, UBS, Jefferies) each employ hundreds of analysts covering thousands of companies globally.

MiFID II research unbundling

Pre-2018, sell-side research was bundled with execution: asset managers received research 'for free' and compensated banks through directed trading commissions. MiFID II (effective January 2018) required European asset managers to explicitly pay for research separately from execution. The reform aimed to surface the true cost of research and reduce conflicts. Consequences: research budgets shrank materially; sell-side research staffing was cut sharply; coverage of small and mid-cap European companies declined. The 2024 UK and EU partial reversal has not fully restored the pre-MiFID-II landscape, but research economics remain weaker than the prior decade.

Long-only asset managers

Long-only firms run mutual funds, ETFs, separate accounts, and pension mandates — generally without short positions. The dominant firms by assets: BlackRock, Vanguard, State Street, Fidelity, Capital Group, T. Rowe Price, Wellington, PIMCO (more bonds), Schroders, JPMAM, Goldman Sachs Asset Management. The mid-cap and boutique tier (Baillie Gifford, Polar Capital, Lindsell Train, Fundsmith) plays a distinct role in active long-only investing — high conviction, low turnover, concentrated portfolios.

Hedge fund strategies

• Long/short equity: classic hedge fund strategy — long the names expected to outperform, short those expected to underperform. Tiger Cubs (Tiger Global, Coatue, Lone Pine, Maverick), Greenlight, Pershing Square.
• Event-driven: focused on M&A arbitrage, special situations, restructurings. Elliott Management, Pentwater, Magnetar.
• Quantitative: systematic strategies, often holding hundreds or thousands of positions algorithmically. Renaissance Technologies (Medallion), DE Shaw, Two Sigma, AQR, Citadel.
• Multi-strategy: combine many sub-strategies under a single platform. Citadel, Millennium, Point72, Balyasny.
• Macro: top-down rates, currencies, equity indices. Bridgewater, Brevan Howard, Caxton.
• Distressed debt and special situations: not strictly equities but adjacent. Oaktree, Apollo, Cerberus.

Activist investors

Activists take material positions in listed companies and publicly campaign for changes — typically capital allocation (more buybacks, dividends), strategic actions (spin-offs, asset sales), or board composition. The major activist firms: Elliott Management (large, multi-strategy), Pershing Square (Bill Ackman), Trian Fund Management (Nelson Peltz), Starboard Value, Carl Icahn's vehicles, ValueAct Capital. Activist returns over the past two decades have generally been strong; the asset class has grown from niche to mainstream.

ETF sponsors

The ETF business is dominated by BlackRock (iShares), Vanguard, State Street (SPDR), Invesco, Schwab, and a long tail of smaller providers. The economics: very thin per-asset fees (some funds charge 0.03% annually) over very large asset bases produce real revenue at scale. ETF sponsors are increasingly powerful stewards of corporate governance — BlackRock's annual proxy voting record has become a regular topic of political and academic debate.

Prime brokers

Prime brokers (Goldman Sachs, Morgan Stanley, JPMorgan, Barclays, Bank of America, Deutsche Bank) provide hedge funds with execution, financing, securities lending, and operational infrastructure. The business runs on net interest margin (financing spreads) and securities-lending fees. Concentration of the top tier has tightened; the 2008-2010 era of European prime broking (Credit Suisse, Deutsche Bank) has retreated as those firms shrank their balance sheets.

Where the analyst sits

An equity analyst's career options span this ecosystem: sell-side equity research, long-only fund manager, hedge-fund analyst (specialised by sector or generalist), private-equity associate / vice president, corporate development at a listed company, ETF research, factor / quant research, or financial journalism. Each role has different demands (long-only requires patience; hedge funds require conviction; sell-side requires synthesis; PE requires deal flow) and different compensation profiles. The skill set is portable across the ecosystem; many analysts move between several of these roles over a career.