Fed Balance Sheet vs S&P 500
The Fed balance sheet (WALCL) has been the single most-cited liquidity input for US equities since 2008. WALCL peaked at $8.93 trillion in May 2022, ran off roughly $2.2 trillion through three years of quantitative tightening, and sat near $6.7 trillion in April 2026 after the FOMC announced the end of Treasury runoff effective December 1, 2025.
Also known as: Fed Balance Sheet (Fed BS, balance sheet, QE, QT) · S&P 500 ETF (SPY) (ETF_SPY, S&P 500, SPX, SP500)
Why This Comparison Matters
The Fed balance sheet (WALCL) has been the single most-cited liquidity input for US equities since 2008. WALCL peaked at $8.93 trillion in May 2022, ran off roughly $2.2 trillion through three years of quantitative tightening, and sat near $6.7 trillion in April 2026 after the FOMC announced the end of Treasury runoff effective December 1, 2025. SPY closed at $708 on April 23, 2026, within 1 percent of its all-time high of $712. The headline correlation between WALCL and SPY is loose; net liquidity (WALCL minus TGA minus RRP) tracks SPY at roughly 0.85.
What WALCL Actually Measures
WALCL is the total assets line on the Federal Reserve's consolidated balance sheet, published every Thursday in the H.4.1 release as the prior Wednesday's level. The series aggregates Treasury holdings (about $4.2 trillion in April 2026), agency MBS (about $2.1 trillion), repurchase agreements, foreign currency swap lines, lending facilities including the Discount Window and the now-closed BTFP, and a smaller residual.
The series is mechanically simple to read but behaviorally complex. Treasury and MBS holdings change slowly through QE purchases or QT runoff. Repo, swap line, and lending facility balances can swing trillions in a single week during stress events. The week of March 19, 2023, the balance sheet expanded $297 billion as banks tapped the Discount Window and the freshly-launched BTFP after Silicon Valley Bank failed. None of that expansion was QE in the traditional sense, but it showed up in WALCL exactly the same way QE does.
From $0.9 Trillion to $8.9 Trillion: A Sixteen-Year Arc
Pre-Lehman, WALCL ran around $0.9 trillion, almost entirely Treasuries used for federal funds rate management. The sequence of expansions: QE1 (Nov 2008 to Mar 2010) lifted the balance sheet to $2.3 trillion. QE2 (Nov 2010 to Jun 2011) reached $2.9 trillion. QE3 (Sep 2012 to Oct 2014) reached $4.5 trillion, where it sat for three years.
QT1 (Oct 2017 to Aug 2019) trimmed the balance sheet from $4.5 trillion to about $3.7 trillion before the September 2019 repo crisis forced the Fed to resume Treasury bill purchases. By February 2020 WALCL was back near $4.2 trillion. The COVID QE that followed (March 2020 onward) doubled the balance sheet to its $8.93 trillion peak in May 2022. Each cycle is mechanically distinct, but the cumulative path is a sixteen-year ratchet upward.
The COVID QE Episode and the SPY Bottom
On March 15, 2020, the Fed cut the federal funds rate to zero and committed to buy at least $500 billion in Treasuries and $200 billion in agency MBS. On March 23 the FOMC
Conditional Forward Response (Tail Events)
How S&P 500 ETF (SPY) has historically behaved in the 5 sessions following a top-decile or bottom-decile daily move in Fed Balance Sheet. Computed from 256 aligned daily observations ending .
Following these triggers, S&P 500 ETF (SPY) rises 0.50% on average over the next 5 sessions, versus an unconditional baseline of +1.20%. 26 qualifying events; S&P 500 ETF (SPY) closed positive in 62% of them.
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Frequently Asked Questions
What is the current Fed balance sheet size?+
WALCL stood at approximately $6.7 trillion in mid-April 2026, down from the May 2022 peak of $8.93 trillion. The balance sheet has been roughly stable since the FOMC announced on October 29, 2025 that Treasury runoff would end on December 1, 2025. MBS runoff continues at the $35 billion monthly cap, but maturing MBS proceeds are reinvested into Treasury bills, leaving total assets approximately flat. The series is published every Thursday at 4:30 p.m. ET in the Federal Reserve's H.4.1 release.
When did QT end and why?+
The FOMC ended Treasury runoff on December 1, 2025, after the October 29, 2025 meeting. Chair Powell signaled the decision on October 14, 2025, noting that bank reserves at $2.89 trillion were "somewhat above" the level the Fed considered consistent with ample reserve conditions. The Fed wanted to stop before reserves hit the same scarcity that triggered the September 2019 repo spike. MBS runoff continues at $35 billion per month, but proceeds are reinvested into Treasury bills, so the total balance sheet is roughly stable rather than shrinking.
How tight is the correlation between WALCL and SPY?+
The headline correlation between weekly WALCL and SPY runs at 0.4 to 0.6 over rolling three-year windows since 2010. Net liquidity, defined as WALCL minus the Treasury General Account minus the Overnight Reverse Repo facility, runs at approximately 0.85 against SPY. The headline series misses two big offsetting dynamics: TGA refills sterilize liquidity even when WALCL is flat, and RRP balances absorbed and then released roughly $2.4 trillion between 2022 and 2025. Most professional liquidity dashboards quote net liquidity rather than raw WALCL.
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