How Public Pension Funds Actually Invest $68 Trillion of Other People's Money

What a Pension Fund Actually Is

A defined benefit pension fund makes a specific promise to its beneficiaries: Work for the required number of years and we will pay you a predetermined monthly income for the rest of your life. That promise creates a liability a long calculable stream of future payments that the fund must be able to meet regardless of what the markets do in the interim. The primary goal of the investment team is to generate sufficient returns on the asset side to support those future obligations on the liability side over time. Everything else arises from thatlimitation

The Global Pension Asset Study published in 2026 estimated that $68.3 trillion in global pension fund assets were held in 22 major pension markets equivalent to 74% of those economies' GDP. In the United States alone public pension funds collectively cover more than 14 million active members and pay benefits to millions of retirees. They are among the largest institutional investors in the world and the decisions made by their investment teamsInvestment impacts stock markets credit markets private equity real estate and infrastructure in ways most retail investors never think about

The Funded Status Problem

Every public pension fund operates with a "capitalization ratio" the relationship between current assets and the present value of future liabilities. A fund with a 100% funded status has in theory enough assets today invested at the assumed rate of return and under current actuarial assumptions to cover projected future benefits. In practice capitalization ratios are sensitive to discount rate assumptions mortality tables and contribution policy soThe average funding ratio of US state pension plans is around 77-80% meaning there is a structural gap between what is owed and what is owned. That gap the unfunded liability is the central pressure that shapes every investment decision

The assumed rate of return matters enormously here. Pension funds must select a discount rate to calculate the present value of their future liabilities. The assumed national average has been stable at 7% for years a figure that requires the fund to actually earn 7% per year net of fees over the long term to remain solvent. In a world where the risk-free rate (the 10-year Treasury bond) is 4.4% earning that extra 2.6% requires taking on risk.Significant.Persistent underperformance relative to the assumed rate typically increases funding pressure forcing employer contributions to be increased repayment periods extended or benefits adjusted. That structural pressure is the main reason pension funds have increasingly moved toward private markets where performance premiums over public equivalents have historically been higher although there is now serious debate about whether that premium survives fee adjustments and normalization of leverage

A Worked Example: Why the 7 Percent Assumption Cannot Move

The discount rate seems like a technical actuarial figure. It is the most important figure for American public finances and two brief calculations show why

First what a portfolio should look like to earn 7 percent. Take the allocation described in the next section and attach reasonable long-term expected returns to each piece

It works and look how little room there is. A quarter of the portfolio is made up of bonds yielding 4.4 percent well below the target so the remaining three-quarters must cover the entire shortfall. Now let's lower the private equity assumption from 10 percent to 7.5 percent matching public equity which is precisely what the skeptics in the counterarguments section below argue is the honest figure after thefees.The portfolio yield drops to around 6.7 percent

This is an error of 0.3 percentage points. It sounds trivial. It is not and the second calculation is why

Second what happens if a fund admits that the goal is unattainable? Pension liabilities behave like very long-term bonds with a duration usually in the range of fifteen to twenty years. The present value of a long-term liability varies approximately according to its duration multiplied by the change in the discount rate

Take a plan that reports $100 billion in liabilities at a 7 percent discount rate with $77 billion in assets or a 77 percent funding ratio. Now reduce the assumed return to 6 percent. With a duration of 20 the liability increases about 20 percent to $120 billion. The assets have not moved. The funding ratio becomes 77 divided by120 or about 64 percent

The plan just got thirteen points worse funded without a single market moved a single retiree added or a single dollar lost. The required annual contribution from the sponsoring government increases accordingly and that contribution comes from a budget that competes with schools roads and police

Which explains something that would otherwise seem like a collective delusion. The 7 percent assumption has held steady for years in wildly different interest rate environments because reducing it turns an investment problem into an immediate fiscal crisis for an elected official. The assumption is not really a forecast. It is the biggest lever a state has over its own reported balance sheet and the incentive to leave it alone is overwhelming

These are illustrative figures and the duration varies depending on the maturity of the plan but the direction and approximate magnitude are the same throughout. Understand that a relationship explains most of the behavior described in the rest of this article including the march towards private markets

How the Portfolio Is Actually Structured

A typical large US public pension fund allocates funds across five broad asset classes. Public equities typically passively indexed to something like the MSCI ACWI make up the largest portion often between 40% and 46% of the portfolio. Fixed income (investment grade government and corporate bonds) accounts for another 23-26% providing stability and liability matching characteristics. The remaining 28-37% is split between alternatives: private equity(10-14%) real assets including infrastructure and real estate (8-12%) and private credit (6-9%).Hedge funds which once had a larger allocation have declined in most funds due to fee pressure and inconsistent returns

The shift in that category of alternatives over the past decade is the most significant structural shift in institutional asset allocation. In 2010 the average American public pension allocated roughly 10% to 15% to blended alternatives. Today that figure is closer to 25-30% for many large public systems a shift documented by Boston College's Center for Retirement Research and Wellington Management's analysis of public pensions. A 2025 Aviva Investors study found thatMore than half of global pension funds allocated at least 10% of their portfolios solely to private markets and at least a third allocated 15% or more. CalPERS the largest public pension in the United States with approximately $530 billion in assets increased its private equity allocation from 13% to 17% in 2024. The direction of travel has been consistent for fifteen years

The Case for Private Markets

The institutional case for private equity is simple: The median 10-year annualized returns of private equity in U.S. public pension portfolios was 13.5% in 2024 according to the American Investment Council's 2025 Public Pension Study a figure that represents the pooled IRR of the funds studied net of fees compared to public equity benchmarks over the same horizon significantly ahead ofpublic equity benchmarks over the same period. Private equity has historically generated an illiquidity premium over public markets although there is active debate among practitioners whether that premium survives full rate adjustments leverage normalization and smoothed valuation effects. The structural logic still holds: locking up capital for 10 to 12 years forces a longer time horizon that benefits patient institutional capital. Private equity managers also exercise active operational control overportfolio companies in ways that passive equity ownership cannot replicate

Private credit has emerged as an equally compelling alternative to traditional fixed income. New capital inflows into private credit vehicles from institutional investors amounted to nearly $300 billion in 2025 virtually flat from the previous year. The attraction is the yield premium over government bonds; direct loans to middle-market companies are typically priced at SOFR plus 500-600 basis points well above what investment grade corporate bonds offer.combined with floating rate structures that performed well during the 2022-2023 rate hike cycle. The secondary market for private assets reached a record $226 billion in 2025 an increase of 41% from the previous year reflecting both increased activity and growing secondary market infrastructure although private assets remain structurally illiquid relative to public markets and secondary discounts can widen substantially during periods of stress

The Serious Counterarguments

The argument against continued expansion into private markets is gaining ground in 2025 and 2026 and deserves serious treatment. The first concern is valuation opacity. Private assets are valued quarterly using valuations provided by managers rather than real-time market prices. During the 2022 public capital drawdown private equity valuations adjusted more slowly than public market prices a feature of quarterly ratings provided by managers insteadof prices in real time. The underlying businesses were not immune to rate hikes and the economic slowdown but reported portfolio values did not reflect this until later periods. Several pension funds in Ohio Oregon Alaska Maine Texas and Nevada have cut their 2025 private equity targets in response to compressed returns and persistent liquidity challenges. Investment staff at the Alaska Permanent Fund described the "golden era" of private equity as if it were in the rearview mirror

The second concern is a $3 trillion buildup of old unsold deals sitting in private equity portfolios globally documented by the Financial Times in early 2026. When exit markets close (IPO windows close strategic M&A slow) private equity firms are unable to return capital to LPs in a timely manner creating denominator effect problems in which private allocation mechanically grows as assets fall.publics. A February 2026 S&P Global report explicitly warned that increasing allocations to private investments were incorporating "a notable increase in risk within pension trusts" risk that is opaque difficult to measure accurately and potentially correlated across funds in ways that become evident only in stress scenarios

There is a third concern that receives less attention and follows directly from the previous example. Watered-down quarterly ratings not only delay bad news they understate measured volatility making a private allocation look better on every risk-adjusted measure a board reviews. A portfolio that appears less risky because it is priced lower often invites a larger allocation and appetite grows precisely because the measurement is poor. This is a feedback loop rather than a one-time error

Case Study: What Happens When the Gap Is Never Closed

The cap ratio problem may seem abstract a slow actuarial argument with no obvious end. Detroit is what the end looks like

The city filed for Chapter 9 bankruptcy protection on July 18 2013 the largest municipal bankruptcy in U.S. history with estimated liabilities in the region of $18 billion. Pension and retiree health obligations were among the largest single components of that figure

The route there is as described in this article. Detroit's pension systems had for years used optimistic return assumptions and in good years had distributed a portion of investment gains to members and retirees as additional payments rather than retaining them as a buffer against bad years. That practice makes a lot of sense if the assumed return is actually as expected and the outperformance is a windfall. It's ruinous if the assumption were aspirational because upsides are spent and downsides are retained

When the city could no longer make its contributions the adjustment fell on people who had already retired. City retirees overall saw their monthly pensions reduced by about 4.5 percent and lost cost-of-living adjustments entirely which in an extended retirement is by far the larger cut of the two. Retired police officers and firefighters whose plan was better funded were treated less harshly

The outcome would have been substantially worse without unusual intervention. The Grand Bargain an agreement under which national foundations the State of Michigan and the Detroit Institute of Arts together pledged approximately $816 million protected the museum's collection from sale and limited the depth of pension cuts. It worked and it is not a mechanism any other city can count on because it depended on a world-class art collection and a set of philanthropic funders to whommattered

Two lessons take away. The first is that the sponsor's ability to pay matters more than the wallet since a plan is only as good as the government behind it and Detroit's tax base has been shrinking for fifty years. The second is that when the adjustment finally comes it doesn't fall on the actuaries who set the assumption or the officials who approved it. It falls on the retirees who made career decisions decades earlier based on a promise

What the Investment Team Actually Does Every Day

This is the part that most coverage leaves out. A public pension investment team is not passively allocating to a few index funds and calling it a day. For private markets allocations alone the work involves finding fund managers conducting due diligence on their investment strategy track record team stability and fee structure negotiating limited partnership agreements monitoring existing portfolio companies through quarterly reports and annual meetings managing the fund's cash flow needs against the physicians' capital call scheduleof header and evaluate co-investment opportunities along with specific agreements. Each of those activities requires specific analytical skills financial models manager evaluation and market knowledge which are significantly different from working in public markets

On the public equity side even a passively indexed portfolio requires managing factor exposure rebalancing against policy objectives securities lending programs and currency hedging for international allocations. Transition management when switching between managers or asset classes involves careful execution to minimize market impact costs the same awareness of transaction costs that applies to any institutional order flow. A $50 billion fund that moves 2% of its bond portfolio toPrivate equity doesn't involve the click of a button. It involves months of planning manager selection scheduling capital calls and coordination across the investment team

How I Would Read a Pension Fund's Annual Report

These documents are hundreds of pages long and are written for skimming. This is the order I would actually work in

I would go to the assumed rate of return first before the performance section because everything else in the report is measured against it. Then I would look at how recently it changed and to what extent. A plan that has maintained 7 percent during a decade of enormous rate volatility tells me that the number is a policy choice rather than a forecast which is what the worked example above predicts

Second you would find the sensitivity disclosure that most plans publish now showing the funding ratio at discount rates one point above and below the assumption. That single table does the calculation work in this article and is the quickest way to see how much of the reported status is an assumption

Third I would compare the contributions actually paid with the actuarially determined contribution. A plan whose sponsor consistently pays less than what the actuary asks is deteriorating regardless of what the investment returns look like and that shortfall is the best predictor of long-term problems

Fourth I would check the cash flow position: benefits paid out against incoming contributions.A mature plan that pays out more than it takes in is a forced seller in every crisis which is precisely when it is most difficult to exit its illiquid private allocation. This is where the issue in private markets stops being profitability and becomes liquidity

Fifth I would treat private market valuations as an assumption rather than a measurement and examine what the plan has actually achieved in cash relative to what it has marked. Distributions are a fact. Marks are an opinion of someone who is paid for them

My own view is that the move to private markets was rational when it began and has been taken well beyond the point where the premium justifies the opacity largely because a smoothed valuation favors every risk measure a board analyzes. This is more opinion than advice

Why This Matters Beyond the Pension World

Public pension funds are among the dominant capital providers in private markets. When 70% of limited partners surveyed plan to maintain or increase their private capital allocations in 2026 that demand sets floor prices on fund terms determines which strategies are funded and determines which sectors attract institutional capital. The shift of pension capital toward private credit has directly contributed to the rapid growth of nonbank lending the same direct lending market that now funds asignificant part of mid-market M&A activity. Understanding how pensions are allocated is not just academic for anyone working in institutional finance. It is the bottom-up context that shapes most of what happens in capital markets

The Bottom Line

Global pension assets reached $68.3 trillion in 22 major markets U.S. state plans are 77 to 80 percent funded on average and the average assumed return has remained at 7 percent for years against a risk-free rate of 4.4 percent. Closing that 2.6-point gap is why alternatives went from 10 to 15 percent of the average portfolio in 2010 to25 to 30 percent current

Two calculations explain the whole system. A portfolio with 43 percent public equity 25 percent bonds and about 31 percent private assets reaches about 7 percent only if private equity generates about 10 percent and drops to about 6.7 percent if it simply matches public equity. And reducing the assumed return from 7 percent to 6 percent raises a $100 billion liability to about $120 billion in a20-year period reducing a 77 percent funded plan to about 64 percent without any market movement. That's why the assumption never moves

Detroit is the reminder of where the road ends when the gap never closes: Chapter 9 in July 2013 roughly 4.5 percent cuts to overall retiree pensions cost-of-living adjustments eliminated and an $816 million Grand Deal that no other city should expect. Understanding how pensions are allocated is the bottom-up context that shapes most of what happens in the capital markets and the number to check first is always thethe actuarial assumptions not the performance table