Fed Balance Sheet vs S&P 500

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.

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.

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 removed the cap and announced unlimited purchases. SPY closed at $222.95 that day, having fallen 34 percent from its February 19 peak of $338.34 in 33 calendar days.

The Fed expanded its balance sheet by $1.6 trillion over the next three months, mostly Treasuries and MBS but including dollar swap line drawings that peaked near $450 billion. SPY rallied 50 percent from the March 23 close to the August 18, 2020 reclaim of pre-COVID highs. The episode is the cleanest single demonstration of liquidity-driven price recovery in modern US equity history. It also reinforced the assumption (which would be tested in 2022 to 2024) that the relationship runs in both directions.

QT2 began June 2022 with caps of $30 billion Treasuries and $17.5 billion MBS per month, doubling to $60 billion and $35 billion in September 2022. The Fed lowered the Treasury cap to $25 billion in June 2024, then again to $5 billion in April 2025, while leaving the MBS cap at $35 billion. Cumulative runoff from May 2022 peak to April 2026 was approximately $2.2 trillion in WALCL terms.

The headline expectation that QT would crush SPY did not materialize. SPY fell 25 percent from January 2022 to October 2022, but most of that drawdown coincided with the policy rate path moving from zero to 4 percent rather than balance sheet runoff. From the October 2022 trough to April 2026, SPY roughly doubled while WALCL contracted by $1.7 trillion. The disconnect resolved through the parallel drain of the RRP facility, which offset most of QT2's mechanical drag.

Net liquidity, defined as WALCL minus the Treasury General Account minus the Overnight Reverse Repo facility balance, captures the share of central bank liquidity actually circulating in the banking system rather than parked at the Fed. The reverse repo facility peaked at $2.55 trillion in December 2022 and drained to roughly $200 billion by late 2025. That $2.35 trillion drain returned cash to money markets, Treasury bills, and ultimately bank reserves.

Net liquidity has held a rolling correlation with SPY of roughly 0.85 over post-2020 windows, well above the 0.4 to 0.6 range that headline WALCL produces against the same series. Money market funds parking cash in RRP versus deploying it into bills behaves differently from the Fed mechanically reducing reserves through runoff, and the spread captures the difference.

On December 19, 2018, Chair Powell stated at the post-FOMC press conference that QT1 was running on "autopilot" and that the Fed had no plans to adjust the pace. SPY had already been weakening through Q4 2018 on China trade tensions, but the autopilot remark accelerated the selloff. From the September 20, 2018 peak of $293 to the December 24 trough of $234, SPY fell 19.8 percent in roughly three months.

Powell reversed the autopilot framing on January 4, 2019, signaling flexibility on both rates and the balance sheet. SPY rallied 13 percent in the next four weeks. QT1 ultimately ended in August 2019, ten months earlier than originally planned. The episode taught markets that balance sheet expectations, communicated through Fed forward guidance, often matter more for SPY than the spot level of WALCL itself.

Silicon Valley Bank failed March 10, 2023; Signature Bank closed March 12; First Republic followed May 1. On March 12 the Fed launched the Bank Term Funding Program, lending against high-quality collateral at par regardless of market value. Banks tapped the BTFP for $300 billion in the first week and reached a peak balance of $168 billion outstanding in early 2024.

WALCL expanded from $8.39 trillion the week of March 8 to $8.73 trillion by March 22, a $339 billion increase in two weeks that reversed roughly six months of prior QT runoff. SPY troughed at $381 on March 13 and rallied 15 percent through May 1. The episode demonstrated that emergency liquidity facilities operate parallel to QT and can swamp it. The BTFP closed to new loans on March 11, 2024, and remaining loans rolled off through their one-year terms.

Chair Powell signaled the QT endpoint in his October 14, 2025 NABE speech, noting that bank reserves were "somewhat above" the level the Fed considered consistent with ample reserve conditions. On October 29, 2025, the FOMC announced that Treasury runoff would cease effective December 1, 2025, while MBS runoff would continue at the $35 billion monthly cap with proceeds reinvested into Treasury bills.

Reserves stood at $2.89 trillion in November 2025 and were expected to drift toward $2.7 trillion as MBS runoff continues. The decision reflected lessons from September 2019, when reserves drained too far and short funding rates spiked above the IORB rate, forcing emergency repo intervention. By April 2026 WALCL had stabilized around $6.7 trillion, with the asset mix shifting slightly each month from MBS to Treasury bills rather than aggregate withdrawal.

With Treasury runoff paused and MBS runoff offset by Treasury bill reinvestment, WALCL is roughly flat to slowly declining through 2026. The mechanical liquidity tailwind that supported SPY from 2009 through 2021 is no longer operating in expansion mode. Forward expectations of the next QE cycle, rather than spot WALCL, drive the marginal SPY response to balance sheet news.

The RRP facility has limited room to drain further from $200 billion. The TGA, which the Treasury rebuilds after each debt ceiling resolution, is now the largest swing factor in net liquidity. Fed asset rotation between MBS and bills is a duration story rather than a liquidity story, but it modestly tightens spreads on agency MBS relative to Treasuries. SPY upside from this point depends on earnings rather than mechanical liquidity supply.

WALCL is released every Thursday at 4:30 p.m. ET as part of the H.4.1 statistical release, with data as of the prior Wednesday. SPY trades continuously. Practitioners overlay the weekly WALCL print with TGA balances (Treasury daily statement) and RRP balances (NY Fed daily release) to compute net liquidity as soon as the H.4.1 lands.

Practical failure modes of using raw WALCL versus SPY: the 2023 BTFP expansion looked like QE in WALCL terms but was emergency lending against existing collateral, not new money creation. The 2024 to 2025 RRP drain offset MBS runoff dollar-for-dollar without showing up in WALCL. The 2018 autopilot selloff and subsequent reversal happened with WALCL barely changing in either direction. The pair is a useful regime indicator on monthly horizons; on weekly horizons net liquidity is the cleaner read, and on intraday horizons the pair is mostly noise.