Battle of the Trend Following Indexes: May 2026

May 2026 was a month in which markets moved sharply but rarely trended. The TTU Trend Barometer traced the sequence 43, 57, 45, 32 across the four weeks, ending the month inside Weak-environment territory for the first time in the current sequence after repeatedly testing the Neutral and Strong thresholds from below. The dominant driver was energy: the Iran and Strait of Hormuz cycle alternated between escalation and de-escalation almost weekly, sending the petroleum complex through two-direction swings that no trend-following horizon could capture cleanly. The one persistent trend of the month sat in equities, where the S&P 500 logged consecutive weekly gains to fresh records and the VIX drained steadily lower. By the final week, sector after sector had resolved into two-way internal splits, and the barometer’s break below 40 confirmed what the compressed index returns already showed.

Week ending 8 May: Energy reverses and the barometer slips to Neutral

The first full week of May inverted the directional alignment that had closed April. Energy reversed hard, the sector averaging -3.72% with all six contracts lower in unison for the first time in the cycle, as diplomatic developments around the Strait of Hormuz reduced the geopolitical risk premium that had supported crude through the prior fortnight. WTI fell 6.40% and Brent 6.36%. Reports indicated the US administration had advanced a de-escalation framework via Pakistani intermediaries, with the previously announced naval operation halted mid-week. Equity indices led the upside at +2.46%, the Nikkei 225 surging 7.15% as it reopened from Japan’s Golden Week holiday and re-priced three sessions in one, with the Nasdaq 100 and S&P 500 both printing records on AI-driven strength. Metals recovered +2.29% as the corrective phase resolved upward. The barometer broke from 55% to 43%, a 12-point drop and the largest single-week decline to that point in the cycle, shifting the classification from Strong back to Neutral. The SG Trend Index slipped to -0.61% MTD and back below the double-digit YTD threshold it had reclaimed at April’s close.

Week ending 15 May: Energy rebounds and the hawkish Fed repricing

The second week reversed the first. Energy surged +5.70% with five of six contracts higher, WTI advancing 10.80%, after the administration rejected the de-escalation framework and signalled a tougher posture toward Iran, repricing the supply-disruption premium straight back into the complex. The broader regime signal came from the Federal Reserve. April CPI printed at 3.8% year over year, exceeding consensus, and PPI logged its largest single-month spike since early 2022. The path to a 2026 rate cut was repriced toward zero, with markets beginning to price a chance of a December hike, and the two-year Treasury yield climbed to a 14-month high. The week also marked the formal expiry of Jerome Powell’s term, with the Fed appointing him chair pro tempore pending the swearing-in of Kevin Warsh, already confirmed by the Senate as the more hawkish successor. The cross-asset response was unusually clean: the dollar advanced 1.46% with all seven counter-currencies lower, Metals fell 3.02% with all five lower in unison, Bonds sold off 1.33% across the curve, and Equities reversed to -1.19%. The barometer rebounded from 43% to 57%, the largest single-week rise of the cycle, lifting the classification back to Strong. The SG Trend Index climbed to +2.13% MTD and +12.48% YTD.

Week ending 22 May: De-escalation reverses energy again

The third week inverted the second. The administration called off imminent strikes early in the week to allow further negotiation, and the petroleum complex repriced the supply premium back out: Energy averaged -3.30% with five of six contracts lower, Gasoline RBOB leading the sector down. The diplomatic walk-back simultaneously released risk appetite. Equity indices averaged +2.40% with all seven contracts higher, the S&P 500 logging its eighth consecutive weekly gain, the European indices advancing more than 3.6%, and the VIX collapsing 10.25%, the largest single-asset move of the week. Metals extended a second weak week at -1.70%, and the cattle complex reversed cleanly to -3.17%, its first synchronised setback in several weeks. The barometer slipped from 57% to 45%, back into Neutral, with the rate of change reversing to Falling Moderately. The five-week sequence had now traced the Strong threshold four times in five weeks without consolidating on either side of it. The SG Trend Index eased to +1.19% MTD and +11.44% YTD, framing the fortnight as round-trip volatility rather than a directional shift.

Week ending 29 May: The petroleum unwind and the break to Moderately Weak

The final week extended the prior week’s direction rather than inverting it, but the internal structure deteriorated further. The petroleum complex fell for a second consecutive week as market pricing reflected returning Middle East production and normalising Hormuz traffic: Brent dropped 11.13% and WTI 9.57%. Natural Gas broke the opposite way, rising 8.90% on a bullish shift in summer cooling-demand forecasts, leaving Energy split internally and down 5.12% at the sector level. The risk tape held firm, with the S&P 500 logging its ninth consecutive weekly gain to a fresh record and the VIX falling a further 9.95%. Beneath the surface, the fracturing spread: Grains reversed down 1.12% after six consecutive positive weeks, splitting into oilseeds-up against grains-down, and Soft commodities split between a Cocoa bounce and an Orange Juice collapse. Bonds firmed 0.71% as April PCE printed slightly soft and Q1 GDP was revised lighter, and the dollar extended lower. The barometer dropped from 45% to 32%, out of Neutral and into Moderately Weak, breaking below the 40% boundary for the first time in the sequence with the rate of change accelerating to Falling Rapidly. The SG Trend Index closed the month near +0.38% MTD and +10.55% YTD, having given back the bulk of the gain it built mid-month.

Implications for Index Construction and May Capture

The energy complex was the proximate cause of the month, and the way it defeated trend capture is more instructive than the size of its moves. Brent reversed direction in three of the four weeks, near 100, then 109, then 103, then 92, and each reversal invalidated the one before it before any trend-following horizon could fully exploit it. A system that re-established long exposure on the mid-month rebound was selling it back a week later; a system that flipped short on the decline was caught by the next bounce. The simultaneous Natural Gas spike on a weather-forecast shift confirmed the sector had stopped trending as one. Headline-driven, two-direction movement of this kind penalises single-sector conviction and rewards bidirectional capacity, which is part of why the diversified blends held the top of the shorter-horizon tables while the concentrated benchmarks merely held their ground.

The cleaner opportunity sat where movement was consistent rather than spiky. The equity advance ran for the full month, the VIX drained lower in a clean multi-week trend, and the dollar and the long end of the curve moved with the softening inflation impulse into month-end. These were the few places persistence survived, and the systems with the horizon and the cross-sector breadth to hold them through the energy noise captured the month’s best contributions. The reward went not to the boldest directional view but to the steadiest one.

Closing Reflection

May produced the narrowest dispersion of the year and the first barometer reading inside Weak-environment territory in the current sequence. Classic Trend led the field for a second month, but by a margin that says more about the scarcity of opportunity than the presence of an edge. SG CTA leads the year-to-date and trailing-quarter tables; Classic Trend leads every long-horizon and risk-adjusted measure and has now taken the Last 12 Months lead as well. The standings barely moved, because the month barely offered anything to move them.

The more useful lesson sits underneath the numbers. Trend followers are conditioned to fear losing months, but a month like May is the more revealing test. Markets moved violently from the first week to the last, and almost none of that movement persisted long enough to be captured. Volatility was everywhere and opportunity was scarce, because the two are not the same thing. Persistence, not movement, is the raw material from which trend-following returns are built, and in May it was the rarest commodity in the market. That, more than any single index result, is what the month had to teach.