SD-01.6 — Total Portfolio Approach & Reference Portfolio

Business Domain: BD-01 Investment Strategy & Allocation (Front office) · Applies: BOTH

Purpose

Runs the cross-asset, factor-and-risk-based whole-fund operating model adopted by some large asset owners in place of asset-class budgets. Under the Total Portfolio Approach there is no policy portfolio of asset-class weights: there is a single reference portfolio — a simple, low-cost passive portfolio expressing the fund’s risk appetite — and every investment competes for capital against it on risk-adjusted terms. SD-01.6 is an alternative to SD-01.4 Strategic Asset Allocation, not an addition to it: an institution adopts one operating model or the other, or a deliberate hybrid. It is activated by large asset owners with the analytics and single-team governance the approach requires.

Service Operations

Define the reference portfolio — the simple passive portfolio that expresses the fund’s risk appetite at lowest cost and serves as the value-add baseline.
Run the opportunity-cost contest — evaluate every candidate investment against the reference-portfolio alternative on a risk-adjusted basis, so capital is allocated by relative merit rather than by silo budget.
Allocate the total-portfolio risk budget — distribute risk by factor exposure across the whole fund, rather than capital by asset-class silo.
Maintain the factor and risk lens — express the whole fund in common factor exposures so cross-asset risk aggregates into one picture.
Measure value-add against the reference portfolio — total-fund return less reference-portfolio return, the Total Portfolio Approach’s headline measure of active value.
Govern the total-portfolio operating model — the single-team, single-budget governance the approach requires in place of asset-class committees.

Inputs and outputs

Inputs: the governing mandate (SD-01.2); capital-market assumptions (SD-01.3); a factor model; the current whole-fund exposures.
Outputs: the reference portfolio, the factor risk budget and the opportunity-cost framework — consumed by the selection domains BD-02 to BD-04 (which compete for the budget) and by BD-09 Performance & Analytics (which measures value-add against the reference portfolio).

Entities

Consumes: Asset Class (E-09), Benchmark / Index (E-10) for the reference portfolio, Risk Measurement (E-19) for factor exposures (risk_type = market), Risk Limit (E-16) for the risk budget; the SD-01.2 governing mandate; the SD-01.3 capital-market assumptions.
Owns: E-29 Allocation Plan for the plan_type = reference_portfolio partition — the versioned reference portfolio and factor risk budget, so a decision traces to the reference in force when it was taken. E-29 is key-partitioned and co-equal: SD-01.6 owns the reference_portfolio partition, SD-01.4 Strategic Asset Allocation the strategic partition, SD-01.10 Commitment Pacing the commitment_pacing partition; it is one shared plan master.

Standards

No external standard governs the Total Portfolio Approach; it is a practitioner operating model pioneered by large sovereign and pension asset owners. The factor-model lens is shared with BD-07 Investment Risk.

Open extensions

The boundary with SD-01.9 Risk-Capital & Strategy Allocation — factor risk budgeting across asset exposures versus risk-capital allocation across teams.
Whether the reference portfolio is reference data administered by SD-09.4 Benchmark Management, as the policy benchmark is.