RLI Insurance

Chief Investment Officer and Treasurer Aaron Diefenthaler oversees the investment portfolio, which backs the firm's property and casualty liabilities. He also serves on the board of Prime Holdings Insurance Services, linking the office to other insurance-sector assets. The CEO, Craig Kliethermes, provides enterprise-level oversight but the investment function reports to Diefenthaler.

RLI is a publicly traded insurance carrier, but its investment office functions with a distinctive governance overlay. Every RLI employee is required to be a shareholder, which influences how the investment team evaluates risk and aligns its asset allocation with long-term balance-sheet preservation. That structure gives the office a capital-preservation ethos closer to a family office than a typical corporate treasury.

The portfolio allocates across fixed income, public equities, and illiquid alternatives including real estate and renewable infrastructure. Confirmed holdings include commercial real estate assets in Peoria — the corporate headquarters and operations center — and an on-site solar installation that feeds energy into the firm's operations.

The investment office operates with a small, internal team led by the CIO. It does not function as a fund-of-funds allocator or maintain a broad external-manager program visible in public filings. In addition to internally managed fixed-income and equity portfolios, the office invests directly in real assets and participates in insurance-sector relationships, such as Aaron Diefenthaler's board seat at Prime Holdings Insurance Services.

RLI directs charitable giving through the RLI Charitable Gift Fund. The fund is a separate vehicle that channels a portion of the firm's community support in Peoria and elsewhere. Investment assets are not commingled with the fund, which operates as a traditional corporate philanthropy arm.

The firm does not publicly market a co-investment program. Its disclosed investment activity centers on directly owned real estate, on-site energy infrastructure, and insurance-sector board relationships. No evidence suggests RLI participates in club deals or third-party co-investment syndicates.

The portfolio is funded by the insurance float — premiums collected from policyholders before claims are paid out — and RLI's own retained equity. Since the firm is publicly traded and employs a universal employee-ownership requirement, the capital base reflects both operational cash flow and the collective interest of its workforce-shareholders.