Record Pension Surplus Is Firing LDI Glidepath Triggers Years Early

A glidepath written to reach fully funded status by 2030 does not pause and recalibrate when a plan gets there in 2026 instead; it executes the next scheduled equity-to-bond sale on schedule, four years ahead of the assumptions that sized it. Milliman's 100 largest corporate DB plans closed the second quarter of 2026 at 109.5% funded, a $41 billion asset gain against just $2 billion of liability growth (Milliman Pension Funding Index, July 2026), and that lopsided gain is what is pulling automatic de-risking triggers forward across the market.

Glidepaths are mechanical by design: a sponsor sets funded-status bands in an investment policy statement, and crossing a band triggers a scheduled reallocation from growth assets into liability-hedging fixed income, executed by the plan's fiduciary or outsourced CIO without a fresh board vote each time. That design choice is deliberate, meant to remove behavioral bias and market-timing temptation from a decision that should be actuarial, not emotional. But a mechanism built to respond to gradual, multi-year funded-status improvement behaves differently when the improvement arrives in a single asset-driven quarter instead. The Milliman 100 gained 4.81% in Q2 2026 investment return alone, pushing the funded ratio from 108.2% in April to 109.6% in May before settling to 109.5% at quarter-end as a modest June dip trimmed $2 billion off the surplus (Milliman Pension Funding Index, July 2026). Liabilities barely moved, since the discount rate underlying the projected benefit obligation slipped only 1 basis point to 5.61% over the same period. A plan whose glidepath assumed the climb to full funding would come gradually, and disproportionately through rising discount rates compressing the liability side, is instead getting there through equity and credit performance on the asset side, on a timetable its own investment committee did not model.

How a Funded-Status Trigger Converts Into a Forced Trade

A typical LDI glidepath specifies asset-allocation targets by funded-status band: perhaps 60% return-seeking assets below 80% funded, stepping down through 40% at 90%, 25% at 100%, and 10% to 15% once a plan clears 110%. Each band crossing is not a suggestion for the investment committee to revisit; it is an instruction, usually automated through the plan's outsourced fiduciary manager, to sell equities and buy long-duration bonds or Treasury STRIPS until the new target weight is reached. The mechanical point of this design is that the sponsor pre-commits to selling risk assets into strength, avoiding the common failure mode where a plan waits for "just a bit more upside" and rides the next drawdown back down through the funded-status band it just crossed.

The duration-matching mechanics tighten as the plan de-risks. At 80% funded with 60% growth assets, a plan can tolerate a meaningful duration mismatch between its bond portfolio and its liabilities, because equity returns are doing more of the work of closing the funding gap and a modest interest-rate move will not swing the funded ratio dramatically. At 105% to 110% funded with 15% growth assets, the fixed-income sleeve is carrying almost the entire funded-status outcome, and its duration relative to the liability's duration becomes the dominant driver of month-to-month funded-ratio volatility. Wellington Management's LDI team frames the resulting decision point directly: "Stronger funding has many plans preparing for their next derisking threshold, while some are taking a step back to evaluate their surplus goals and investment strategy" (Wellington Management, "LDI in 2026: 10 Questions for 2026," 2026). The June 2026 wave of plans crossing 109% to 110% funded is precisely that threshold, hit years before most 2021-vintage glidepath models expected it.

Why the Trigger Fires Faster Than the Glidepath Was Built to Expect

Most glidepaths in force today were designed or last recalibrated during 2019 through 2022, when discount rates sat in the 2.5% to 3.5% range and funded ratios for the median large plan hovered in the 85% to 95% band. The modeling assumption embedded in those glidepaths was that closing the remaining gap to full funding would take a blend of equity outperformance and, more importantly, a gradual normalization of interest rates lifting the discount rate and shrinking the present value of the liability. That is exactly what happened between 2022 and 2024, when the Federal Reserve's rate-hiking cycle compressed pension liabilities across the market and pushed the Milliman 100 from roughly 96% funded at the end of 2021 past 100% by 2023.

What the 2019-to-2022 vintage of glidepaths did not model as heavily was a second leg of funded-status improvement driven almost entirely by asset returns after rates had already stabilized. That is the leg the market is now in: the discount rate has been essentially flat, moving only 9 basis points lower over the trailing twelve months to May 2026 even as the funded ratio improved from 104.2% to 109.6% on the back of a 13.15% cumulative asset return over the same period (Milliman Pension Funding Index, July 2026). A glidepath calibrated to expect roughly half its de-risking triggers to come from rate-driven liability compression is instead seeing nearly all of them come from asset growth, and asset growth is precisely the scenario in which the plan has the least natural hedge against giving the surplus back: a return-seeking portfolio that outperforms can also underperform just as fast, while a liability that already stopped moving will not bail the plan out on the way down.

The Hedge-Ratio Mismatch: Built for a Different Rate Regime

Hedge ratios, the share of the liability's interest-rate and credit-spread sensitivity that the fixed-income portfolio offsets, were set for many plans during the low-rate decade when duration extension was cheap and the marginal cost of over-hedging was small. A plan that locked in an 80% hedge ratio in 2019, when the 30-year Treasury yield sat near 2.6%, built that ratio using STRIPS and long corporate bonds priced for a very different discount-rate environment than the 5.61% rate underlying today's PBO (Milliman Pension Funding Index, July 2026). As the plan has since de-risked toward its terminal asset allocation, of which fixed income already made up 52.7% of total assets for the largest plans at fiscal year-end 2025, up from 52.2% the year before (Milliman 2026 Corporate Pension Funding Study), the completion of that hedge, filling in the gap between the fixed-income sleeve's actual duration and the liability's duration using Treasury futures or interest-rate swaps, was calibrated against 2019-era convexity and cash flow assumptions that no longer describe the same plan's now-larger, more mature liability profile.

The practical failure mode is a hedge ratio that overshoots or undershoots by a margin the sponsor does not discover until the next remeasurement. Overshoot happens when a plan's fixed-income duration was extended to match a liability duration assumed under lower discount rates and higher expected future benefit payment growth; if the liability's actual duration has since shortened, perhaps because lump-sum elections or a partial buy-in removed a chunk of longer-duration deferred and active liability, the plan is now over-hedged relative to what remains, meaning it is more exposed to rising rates helping the surplus (a real risk, given the plan wants to preserve gains, not extend them) but also carries unnecessary tracking error against its own benchmark. Undershoot happens when a legacy hedge ratio, set at 80% under an old model, is quietly delivering something closer to 65% to 70% effective coverage against the current liability because the duration or convexity assumptions embedded in the original hedge construction have drifted out of date. Neither error shows up cleanly on a monthly funded-status report; both require a dedicated liability cash flow analysis, not just a rebalancing to target weights, to detect.

De-Risking Meets a PRT Market Pricing Below Par

The glidepath trigger question does not exist in isolation from the pension risk transfer market, and July 2026 pricing makes the interaction concrete. Milliman's Pension Buyout Index shows the competitive-bid cost of a full annuity buyout falling from 99.7% to 99.6% of a plan's accounting liability (accumulated benefit obligation) during June 2026, with the competitive bidding process saving sponsors an estimated 3.0% relative to the average bid received (Milliman Pension Buyout Index, July 2026). A plan sitting at 109.5% funded on a projected benefit obligation basis and facing a settlement cost of 99.6% of accounting liability, a narrower and typically smaller measure than PBO, can in many cases transfer its retiree liability to an insurer at a price below the assets it is currently holding against that liability, crystallizing a GAAP settlement gain rather than a loss.

This is where glidepath mechanics and PRT readiness pull in the same direction, but on different clocks. A glidepath trigger executes an asset reallocation the moment a funded-status band is crossed, typically within days through the outsourced fiduciary manager's standing authority. A PRT transaction requires RFP preparation, insurer due diligence under the Department of Labor's Interpretive Bulletin 95-1 selection criteria, participant data cleanup, and typically a minimum of several months from mandate to close. A plan whose glidepath has already de-risked it to a 10% to 15% growth allocation is operationally closer to PRT-ready than one still holding 40% in equities, since the insurer pricing the annuity is effectively bidding on a portfolio the sponsor has already made safer. But if the sponsor has not separately initiated the PRT process, the glidepath's automatic de-risking can leave the plan sitting in a low-return, fully-hedged posture for a year or more while the settlement decision works through governance, forgoing the return-seeking assets it no longer holds without yet capturing the settlement gain the pricing window currently offers.

Comparing Glidepath Vintages: What Changed Since 2019

Assumption	2019-vintage glidepath design	Mid-2026 reality
Discount rate at design	~2.6% to 3.3%	5.61% (Milliman PFI, June 2026)
Expected path to full funding	Gradual, rate-driven liability compression plus moderate equity return	Asset-driven: 13.15% trailing 12-month return vs. 9 bps of discount-rate movement
Typical fixed-income share at trigger	Modeled to rise gradually over 5 to 8 years	Already at 52.7% for the largest plans at FY2025 year-end, up from 24.1% equity share
PRT settlement pricing assumption	Buyout at premium to ABO (105% to 110% historically typical)	Competitive-bid buyout at 99.6% of ABO (Milliman PBI, June 2026)

Governance: Documenting an Automatic Trigger That Nobody Voted On

The fiduciary governance question raised by early-firing glidepath triggers is subtle because the entire point of a pre-committed glidepath is to remove discretionary decision-making from each individual reallocation. That design serves ERISA prudence standards well when the trigger fires close to the pace the sponsor's investment policy statement anticipated. It becomes a harder question to answer in a plan committee meeting when a trigger fires years ahead of the model that justified adopting it, and a committee member asks whether the fiduciary manager's authority to execute that reallocation without a fresh vote was ever meant to cover a scenario this far outside the original design assumptions.

The documentation answer is not to override the trigger after the fact, which would reintroduce exactly the market-timing discretion the glidepath was built to eliminate, but to document contemporaneously that the committee reviewed the triggered reallocation against the current investment policy statement, confirmed the IPS language does not condition execution on the pace at which the funded-status band was reached, and recorded whether the underlying capital market and liability assumptions still support holding the course. That review does not need to happen for every quarterly rebalance, but it is the appropriate response the first time a plan crosses a de-risking band meaningfully ahead of its model timeline, since it creates a contemporaneous fiduciary record rather than a retrospective one built after a reversal has already occurred.

Reversal Risk: What Happens if the Discount Rate Moves the Other Way

The asymmetry that matters most for plans that have just de-risked into a high fixed-income allocation is what happens if discount rates fall rather than hold. Milliman's own scenario cone for the Milliman 100 shows the range starkly: under a pessimistic scenario combining 2.61% asset returns with discount rates declining to 4.67% by the end of 2027, the funded ratio would fall to 94%, erasing the surplus entirely, versus a base-case projection of 111.5% funded and a $137 billion surplus under stable rates and a 6.61% expected return (Milliman Pension Funding Index, July 2026). A plan that has already executed its glidepath's terminal reallocation into a heavily hedged, low-growth-asset portfolio has less capacity to earn its way back out of a funded-status decline driven by falling rates, because the assets doing the earning have already been sold down. That is precisely the trade-off the glidepath is designed to accept deliberately, since the entire purpose of hedging out interest-rate risk at high funded status is to lock in the surplus rather than continue speculating on it. The risk is not that the glidepath is wrong to de-risk; it is that a trigger firing years ahead of schedule leaves less time for the sponsor to have separately locked in the settlement or hibernation strategy that would make the newly hedged position durable, rather than simply parked.

What This Means for the Reserving and Investment Actuary

The practical actuarial task this creates is a reconciliation, not a redesign. Plans that have crossed a de-risking band since the equity-driven gains of the past several quarters should have their glidepath's underlying liability duration and cash flow assumptions refreshed against the current census and discount-rate environment before assuming the existing hedge ratio still delivers its stated coverage. Where fixed-income allocation has already reached its terminal target ahead of schedule, the sponsor's investment committee and actuary should jointly determine whether the plan is functionally PRT-ready, in which case the settlement pricing window at 99.6% of ABO argues for accelerating the RFP process rather than sitting in a fully hedged holding pattern, or whether the intended endgame is hibernation, in which case the governance documentation described above becomes the priority. Either path is better than treating an early-firing trigger as a routine rebalancing event and revisiting the glidepath's core assumptions only at the next scheduled multi-year review.