On May 15, Jerome Powell officially concluded his term as Federal Reserve Chair, with Kevin Warsh taking the oath of office as his successor. The central question for markets is: how will U.S. stocks fare under the new Fed leadership? A recent report from Huafu Securities cautions investors to be wary of a deceptive calm during the "first month of transition." Historical patterns suggest that the initial month following a new Fed Chair's appointment is typically characterized by relative stability in U.S. equities, with performance often slightly better than historical averages. However, the true market variables often emerge 3 to 6 months after the leadership change. As new policy frameworks gradually become priced in, the average maximum drawdowns for U.S. stocks over 3-month and 6-month periods reach -10.13% and -13.14%, respectively, indicating a significant rise in medium-term volatility risk. Concurrently, a shift in policy style is reshaping asset pricing logic. During his confirmation hearing, Warsh explicitly stated his intention to move away from the "excessive communication" and forward guidance framework prevalent under Ben Bernanke, Janet Yellen, and Jerome Powell. This signals that the Fed will no longer act as a market "escort," leading to a sharp increase in asset price sensitivity to economic data and policy meeting decisions. On the operational front, Warsh plans to introduce the trimmed-mean PCE as a new inflation gauge. Constrained by the current system's size of approximately $3 trillion in reserves, he may proactively slow the pace of quantitative tightening (QT). Investors should prepare for higher expected volatility and more pronounced asset repricing over the coming six months.
The "Honeymoon Phase" and the Medium-Term "Risk Amplifier" Historical data indicates that the impact of a Federal Reserve Chair transition on U.S. stocks exhibits a clear pattern of "limited short-term effects, amplified medium-term effects." Markets often overreact to the uncertainty of potential policy shifts, but experience since 1970 reveals a counterintuitive phenomenon: the first month post-transition is not a period of turmoil for U.S. stocks but rather a relatively safe "observation period." Specifically, one month after a transition, the S&P 500 has posted an average gain of 1.81%, significantly higher than the historical average of 0.80%. The average maximum drawdown during this period was only -2.91%, better than the historical average of -3.95%. This is primarily because new Chairs typically maintain their predecessor's policy framework or communication stance initially, providing short-term market certainty. However, genuine risks gradually materialize in medium-term pricing. As the new policy path from the FOMC, evolving economic data, and the substantive impact of the new Chair's communication style take hold, U.S. stocks enter a significant risk amplification window:
3-Month Horizon: The average S&P 500 return shifts from a historical norm of +2.28% to -1.74%. The average maximum drawdown widens to -10.13%, deepening by 2.92 percentage points compared to the historical norm.
6-Month Horizon: The average gain further narrows to 1.17%, far below the historical norm of +4.63%. The average maximum drawdown plunges to -13.14%.
In summary, the impact of a Fed leadership change on U.S. stocks is not immediate but a process of gradual intensification. Beneath the calm surface of the initial transition period, investors must maintain high vigilance for volatility risks over the 3 to 6-month horizon.
Historical Review: Macro Cycle and Policy Continuity Dictate Market Fate Reviewing Fed transitions since 1970 reveals that the ultimate market direction is not determined by the "change of personnel" itself, but by the prevailing inflation levels, valuation positions, and whether the new Chair continues the existing policy framework. The underlying macroeconomic conditions during each transition are the key variable determining the intensity of U.S. stock market volatility.
Political Compromise and Stagflation Risks (1970 Burns, 1978 Miller) When Arthur Burns took office, U.S. inflation was high (CPI ~6.2%) with unemployment at 4%. Under political pressure from President Nixon, he suppressed the effective federal funds rate from 5.75% to 3.25%, briefly fueling the "Nifty Fifty" rally but ultimately destroying inflation expectations and sowing the seeds for subsequent stagflation. After G. William Miller succeeded, U.S. stocks rose 18.68% over six months. However, this rally was built on a false prosperity of negative real interest rates, as inflation remained unchecked. When Miller took office, inflation was already at a higher level and rising, yet he still refrained from tightening, leading to a further loss of control over inflation expectations.
Aggressive Tightening and Valuation Killer (1979 Volcker, 1987 Greenspan) Facing runaway inflation, Paul Volcker pushed interest rates to extreme levels near 20%, causing a -10.25% maximum drawdown in U.S. stocks over six months. However, this short-term pain secured a fundamental control of inflation, eventually suppressing CPI to the 3%-4% range. Alan Greenspan initially maintained a tightening stance upon taking office. Coupled with high U.S. stock valuations and the prevalence of program trading at the time, this directly triggered "Black Monday"—the market experienced a maximum drawdown of -5.16% within his first 60 days. This shock forced a rapid policy pivot, cutting rates from 7% to 5.5% in a short period to stabilize markets.
Smooth Transition and Cycle Continuation (2006 Bernanke, 2014 Yellen, 2018 Powell) When Ben Bernanke succeeded, economic fundamentals were relatively stable, and he continued the rate hike path, resulting in a modest 3-month maximum drawdown of only -2.16%. When Janet Yellen took over, CPI was a mere 1.1%, and the Fed maintained its zero interest rate policy, allowing markets to climb steadily amid a mild recovery, gaining 8% over 180 days. Jerome Powell took the helm in the latter stages of a hiking cycle. In 2018, amid trade tensions, he continued with four rate hikes to 2.25%-2.5%, putting noticeable pressure on U.S. stocks early in his tenure. Historical experience shows that what truly determines market direction is the underlying cyclical position and policy choices surrounding the transition, not the transition itself.
Warsh's Policy Blueprint: Reshaping Inflation Narrative and Ending "Excessive Communication" If he leads the Fed, Kevin Warsh could reshape central bank communication, reduce forward guidance, and leverage the "trimmed-mean PCE" and AI productivity narratives to create policy space for rate cuts. During his Senate confirmation hearing, Warsh displayed a distinct reflective and reform-oriented stance, directly pointing to the 2021-2022 inflation surge as a major policy failure. Operationally, markets should closely monitor adjustments to his communication approach. Warsh explicitly opposed pre-disclosing interest rate paths, arguing that "excessive communication" limits policy flexibility. This suggests the potential end of the expectation management model maintained for nearly fifteen years from Bernanke through Yellen to Powell. Without the cushion of forward guidance, risk assets will exhibit amplified volatility in response to economic data and FOMC meeting outcomes. Regarding the logic for rate cuts, Warsh did not promise rapid easing but outlined two potential pivots for loosening:
AI Productivity Narrative: He believes efficiency gains from artificial intelligence could provide a long-term rationale for lowering rates.
New Inflation Measurement Framework: He specifically mentioned the Dallas Fed's "trimmed-mean PCE," which excludes the bottom 24% and top 31% of price changes by weight. Under current tariff and specific commodity shocks, this measure is significantly lower than core PCE. If its weight in decision-making increases, the Fed could construct a narrative of "potential inflation having receded," thereby creating room for rate cuts.
Regarding balance sheet reduction (QT), Warsh advocates for a slow and cautious approach coordinated with the Treasury. However, current liquidity conditions do not support aggressive action. Bank reserves currently stand at approximately $3 trillion, while the ONRRP (overnight reverse repurchase agreement facility) buffer is narrowing. Referring to the 2017-2019 QT cycle, a repo market crisis was triggered when reserves fell to about $1.4 trillion. Considering stricter current regulations and banks' higher endogenous demand for reserves, the actual scope for compressing liquidity is limited. Therefore, QT under Warsh's leadership is more likely to follow a compromised path of being "slower, shallower, and more back-loaded."
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