September 2026 Strategy Review: Bonds Crash, Gold Reverses, and Commodities Lead Again

September 2026 was a difficult month for systematic strategies. After August's broadly positive performance — where nearly every invested strategy made money — September reversed course sharply. The majority of strategies posted negative returns, with an average return of -0.84%.

The month was defined by a historic bond selloff and a sharp gold reversal. The 10-year Treasury yield touched 5.04% — its highest since 2007 — and the 30-year yield climbed above 5.6%, a level not seen since 2002. TLT (long-term Treasuries) fell -5.74%, its worst month of 2026. Gold dropped -6.75%, giving back most of August's 10% rally. The only strategies that posted gains were those with commodity exposure (excluding gold) — broad commodity baskets like GSG (+4.53%), DBC (+3.26%), and PDBC (+3.49%) continued to rally while nearly everything else fell.

What Happened: The Macro Picture

The bond market rout intensified. The selloff that began after Fed Chair Warsh's hawkish Jackson Hole speech in late August accelerated through September. The CME FedWatch tool showed a 66% probability of a rate hike, and rising US-Iran tensions pushed oil prices higher, adding inflationary pressure. TLT fell -5.74%, IEF lost -3.70%, and even SHY (short-term bonds) declined -0.84%. The only fixed income instrument to hold its value was BIL (T-bills), essentially flat at -0.02%. For any strategy holding bond duration beyond T-bills, September was painful.

Gold reversed sharply. GLD fell -6.75%, erasing most of August's +9.93% surge. The drivers were a stronger dollar as rate hike expectations solidified, Treasury yields at multi-decade highs increasing the opportunity cost of holding non-yielding assets, and profit-taking after gold failed to hold above $4,400. For context, gold's June loss was -11.68% and March was -11.05% — September's -6.75% decline, while significant, was not the year's worst for the metal.

Equities were mixed, with a tech-value divergence. SPY fell -0.58% while QQQ gained +3.21%. Technology (XLK +4.96%) outperformed, driven primarily by semiconductor strength — SMH surged +9.41% on AI infrastructure demand. But outside tech, the picture was negative: IWM (small caps) fell -5.46%, IWN (small-cap value) dropped -5.57%, VEU (international equities) declined -2.67%, and EFA (developed international) lost -3.31%. Only Japan (EWJ +1.65%) and commodity-linked sectors bucked the trend.

Broad commodities were the safe haven. In a month where bonds, gold, equities, and international markets all fell, the diversified commodity baskets rallied: GSG +4.53%, PDBC +3.49%, DBC +3.26%. Energy prices rose on US-Iran tensions. This made commodity-exposed strategies the only consistent winners — a pattern that has defined much of 2026.

Top Performers: September 2026

Why They Outperformed

DGA earned another +3.49% from its 100% PDBC (commodities) allocation. While gold crashed -6.75%, broad commodity baskets actually gained — PDBC rose +3.49% and GSG +4.53% — driven by energy prices. Crude oil rallied on US-Iran tensions and natural gas remained firm. DGA's commodity momentum signal favored the diversified commodity basket over gold-specific exposure, sidestepping the precious metals correction entirely. At +31.78% YTD, DGA has extended its lead to nearly ten points above second-place DUAL-T6 (+21.11%). The TIP canary signal has now kept DGA in PDBC for a second consecutive month after August's re-entry following July's cash rotation.

VAA-G12 earned +1.84% from a 50/50 split between GSG (commodities) and SHY (short-term bonds). The GSG half gained roughly +2.3% while the SHY half lost -0.4%, for a net positive. The strategy's breadth momentum signal allowed partial commodity exposure rather than going fully defensive — a positioning that proved prescient in a month where commodities were one of the only positive asset classes.

EAA-OFF gained +1.71% with a 64% GSG allocation. The IEF bond allocation (29%) created drag — losing roughly -1.1% of portfolio value — but the commodity position's gains more than compensated. The Elastic Asset Allocation approach has now posted positive returns in three of the four summer months, with only June's commodity correction interrupting the streak.

PAA earned +1.09% from a three-way split of GSG (26%), EEM (26%), and QQQ (26%), with IEF (22%) as the protective bond sleeve. The commodity and tech allocations gained enough to offset the bond and emerging market drags. PAA's broader universe — which includes commodity ETFs — gave it diversification that mattered in September.

BAA-B earned +1.07% from a simple two-way allocation: BIL (67%) and DBC (33%). The T-bill majority protected capital while the one-third commodity exposure captured DBC's +3.26% gain. This cautious construction — defensive backbone with commodity upside — has been one of the most consistent approaches of 2026, with BAA-B at +10.13% YTD.

Underperformers: The Bond and Gold Fallout

September's losers tell a dramatically different story from August. Where August's "worst" performers barely lost a quarter of a percent from defensive positions, September delivered real pain — especially to strategies exposed to long-duration bonds, gold, and small-cap value.

DAA-U1 suffered the month's worst loss at -7.64%, holding 100% UST (long-duration Treasuries). The strategy had been defensive for months, but its "defensive" asset — long bonds — became the single most dangerous position in September. When 30-year yields surge above 5.6%, the duration risk in long bonds overwhelms any safety premium. DAA-U1's YTD has deteriorated to -8.00%, the worst YTD in the strategy universe. This is a stark reminder that "defensive" and "safe" are not synonyms — the choice of defensive asset matters enormously in a rising-rate regime.

Golden Butterfly lost -3.90% as four of its five equal-weighted positions declined: TLT -5.74%, GLD -6.75%, IWN -5.57%, SHY -0.84%. Only SPY was roughly flat at -0.58%. The static, equal-weighted portfolio that provides diversification in most environments was punished by September's simultaneous selloff across bonds, gold, and small-cap value — three historically uncorrelated asset classes declining together under the weight of surging yields.

GTAA-AGG3 gave back -3.79% from its EEM/IWN/IWM allocation — concentrated in emerging markets and small-cap value, exactly the equity factors that suffered most in September. After riding momentum factors to the YTD leaderboard through August, the strategy's return for the month reflected the broad retreat in international and small-cap equities. YTD remains solid at +16.47%.

RAA lost -3.71% from a five-way split that included three sharply declining assets: GLD (-6.75%), TLT (-5.74%), and IWN (-5.57%). Only QQQ's +3.21% gain provided a partial offset. RAA's design assumes low correlation across its five asset classes — but September was one of those rare months where yields drove gold, bonds, and small-cap value down simultaneously.

Sell in May lost -3.70% from its 100% IEF position. The seasonal strategy keeps the portfolio out of equities during summer, holding intermediate bonds instead. In a typical year, IEF provides modest positive carry — but with the 10-year yield surging to 5.04%, IEF's price decline of -3.70% turned the seasonal hedge into a liability. This was IEF's worst monthly loss of 2026.

Year-to-Date Leaders

DGA's dominance is now commanding. At +31.78% YTD, it leads second-place DUAL-T6 by more than ten full points. The commodity trade that many would have abandoned after June's -9.88% loss has proven to be the single most profitable systematic position of 2026.

DUAL-T6 held second place at +21.11%, earning a modest +0.50% in September from its six-way split across GSG, QQQ, EWJ, EEM, IWM, and SPY. The broad diversification meant the commodity and tech gains (GSG +4.53%, QQQ +3.21%) partially offset losses in emerging markets and small caps. DUAL-T6's equal-weighted approach across six diverse assets has quietly compounded strong returns all year.

Mama Bear slipped from its August peak after losing -2.13% from its IWM/EEM/SPY allocation. Small-cap (IWM -5.46%) and emerging market (EEM -0.34%) weakness hit two of its three positions. At +18.90% YTD, it remains strong — but the equal-weighted equity approach now faces headwinds from the market's narrowing leadership.

HAA-B continues to demonstrate the power of capital preservation. At +15.00% YTD despite earning just -0.02% in September, it has now sat in BIL (100% T-bills) for three consecutive months. Its canary signal has kept it on the sidelines since July — missing both upside and downside while maintaining a strong YTD position built on first-half gains.

GEM lost -2.67% in September from its VEU (international equities) allocation. The foundational dual momentum strategy had rotated from US to international equities entering September, but VEU's -2.67% decline — driven by dollar strength and rate differentials — punished the rotation. At +13.49% YTD, GEM has given back some ground but remains competitive.

Regime Status: 12-Month Perspective

The chart below shows how average defensive weight across the strategy universe has evolved over the past thirteen months. Average bond and cash allocation has continued climbing — from 36.6% entering September to 37.7% during September and now 41.8% entering October, a new 2026 high.

Entering October, 17 strategies are fully defensive — up from 16 entering September. More importantly, the average defensive weight across all strategies has risen to 41.8%, meaning even strategies that remain invested are holding larger bond and cash sleeves than earlier in the year. The bond selloff and gold reversal have not triggered a return to risk — if anything, strategies are growing more cautious as yield conditions tighten.

• Fully defensive entering October (17): HAA-B, HAA-S, GGC, GGC-ENH, Piard Seasonality in BIL (cash). Gold XA in cash. DAA family in SHV/UST. KDA and Sell in May in IEF. VAA-G4, VAA-G12, and TACBOND in SHY
• Bond-defensive strategies face a challenge: KDA and Sell in May hold IEF, which lost -3.70% in September. DAA-U1 holds UST, down -7.64%. "Defensive" allocations in intermediate and long bonds are actively losing money as yields rise
• Cash-defensive strategies are safer: HAA-B, GGC, and Piard Seasonality in BIL earned essentially zero (-0.02%) — they missed the upside but avoided the pain. In September's environment, the distinction between BIL-defensive and IEF-defensive was worth 3-7 percentage points

Looking Ahead: October Allocations

Notable allocation changes entering October:

• DGA — maintained PDBC (100% commodities). The TIP canary signal remains constructive on the commodity trend
• VAA-G12 — shifted from GSG/SHY to SHY 100% (fully defensive). The breadth signal deteriorated after September's broad equity weakness
• GTAA-AGG3 — rotated from EEM/IWN/IWM to MTUM/EEM/SPY — shifting from small-cap value to momentum factor exposure
• Mama Bear — rotated from IWM/EEM/SPY to SPY/EEM/DBC — replacing small caps with commodities, reflecting the shift in asset class momentum
• Sector RS — maintained XLK/XLE/XLV (33% each) — the same sector allocation that earned -0.04% in September, a near-flat result in a difficult month

The Systematic Investing Takeaway

September completed a striking two-month contrast. In August, the average strategy gained +2.42% and the vast majority of strategies posted positive returns. One month later, the average strategy lost -0.84% and only a minority of strategies were positive. The narrative shifted from "everything works" to "almost nothing works."

The systematic investor experienced both months without making a single emotional decision. DGA held PDBC in both months — gaining +6.21% in August and +3.49% in September — because the momentum signal said commodities. HAA-B sat in BIL in both months — earning essentially zero while avoiding both August's upside and September's widespread losses. Each strategy followed its process regardless of the prevailing narrative.

The most instructive case is the bond market. Strategies like DAA-U1 (-7.64%), Sell in May (-3.70%), and KDA (holding IEF) chose bonds as their defensive asset — a historically reasonable choice. But when 10-year yields surge to 5.04% and 30-year yields break above 5.6%, duration risk overwhelms any safety premium. Strategies that chose BIL over IEF or TLT avoided this trap entirely. The difference between losing -7.64% (DAA-U1 in long bonds) and losing -0.02% (HAA-B in T-bills) — both nominally "defensive" positions — is the most important lesson of September 2026.

Nine months into 2026, the YTD leaderboard features DGA at +31.78%, DUAL-T6 at +21.11%, and Mama Bear at +18.90% — each achieving it through completely different mechanisms: commodity momentum, cross-asset diversification, and equal-weighted equity exposure. Only a handful of strategies are in negative territory for the year. The diversity of paths to strong returns reinforces the core thesis: disciplined execution of well-designed systematic approaches compounds over time, even through months where the majority of strategies post losses.