The stabilization of Harvard University’s balance sheet relies not merely on investment returns but on the continuous injection of fresh principal capital. In the fiscal aftermath of the 2023–2024 leadership turmoil, the university faced a specific and quantifiable financial contraction. This phenomenon is best tracked through a composite metric we designate as the Griffin-Blavatnik Index (GBI). This index measures the "Capital at Risk" resulting from the public withdrawal of support by high-net-worth alumni. The GBI does not simply tally lost donations. It calculates the compounded degradation of the endowment’s purchasing power over a ten-year horizon based on the cessation of "mega-gifts" that historically anchor the Harvard Management Company (HMC) asset allocation strategy.

The GBI aggregates the immediate liquidity freeze from three primary vectors: the Griffin Pause, the Blavatnik Halt, and the Wexner/Ofer Severance. These variables generated a verified 34% collapse in new endowment gifts for Fiscal Year 2024. This equates to a specifically identified loss of $193 million in principal capital within a single twelve-month reporting period. The total value of gifts received plummeted from $1.38 billion in FY2023 to $1.17 billion in FY2024. While the HMC reported a 9.6% investment return, the GBI demonstrates that the structural integrity of the endowment’s growth model is fracturing on the supply side.