Colombia’s COLCAP Faces Cepeda Surge and Constituent Assembly Call
The Big Three
The MSCI COLCAP enters Monday at 2,178.00 — unchanged from Thursday’s close — after no trading on Friday May 1 (Labor Day holiday), but the political landscape has shifted dramatically over the weekend. Polymarket now prices Cepeda (Historic Pact, left) at 42% — up from 36% two weeks ago — while Valencia (Democratic Center, center-right) has fallen to 30% from 42%. The leftist candidate is now the clear prediction-market frontrunner for the first time in this series’ coverage. The April AtlasIntel poll shows all three top candidates in a narrow 26–28% band, but the right-wing vote is split between Valencia and de la Espriella (far-right, Milei-style). The prior report’s thesis — that the COLCAP’s recovery depended on a “decisive Valencia polling signal” — is being challenged. The May 31 first round is 27 days away.
Petro used his final May Day rally to call for a national constituent assembly — a mechanism to rewrite parts of the constitution and enshrine the social reforms that Congress rejected. “We do not want to change the constitution; we want to add two chapters: the social reforms that the current Congress did not approve, and reform of the political system to eradicate corruption,” Petro wrote on social media. Cepeda, the Pacto candidate, immediately distanced himself: a constituent assembly is “not a priority” of his potential government. The split matters: if Cepeda wins, the market must assess whether he pursues Petro’s constitutional-rewrite agenda or governs more moderately. The constituent assembly call is Petro’s final-month escalation — an attempt to set the political agenda for his successor regardless of who wins.
A wave of pre-election violence has put Colombia on edge: a roadside bomb killed 21 in the south, rebel attacks are escalating in the southwest, and armed groups have grown from 15,000 to 22,000 fighters under Petro’s “Total Peace” program. NPR reported that security is now the number-one voter concern — a dynamic that benefits right-wing candidates (de la Espriella pledges to “cancel peace talks, capture or kill criminal group members, and build 10 megaprisons”). The Conservative Party has formally endorsed Valencia, unifying the right-wing institutional base. But the March 8 primary turnout data tells a contradictory story: 7 million voted in the right’s primary vs 830,000 on the left — an 8:1 gap — suggesting higher right-wing motivation. The question is whether that motivation consolidates behind one candidate or remains split.
01 Market Snapshot
| Indicator | Value | Change |
| MSCI COLCAP (last close May 1) | 2,178.00 | +1.54% from Apr 30 (last trade) |
| RSI signal | 38.34 | recovering from 31.56 |
| MACD histogram | −23.32 | still deepening |
| 200-day SMA (first target) | 2,224.22 | 46 pts above close |
| 2026 Low | 2,144.99 | floor |
| Polymarket: Cepeda (SHIFTED) | 42% | was 36% — now frontrunner |
| Polymarket: Valencia (SHIFTED) | 30% | was 42% — now second |
| Presidential 1st round | May 31, 2026 | 27 days |
Live Market IntelligenceColombia — Live Market Board
Rio Times · Live Market Intelligence
Colombia — Live Market Board
-1.13%
170,331
-2.22%
68,286
-0.88%
10,360
-1.04%
3,164,196
-1.86%
2,238.99
-1.13%
34,836.62
+0.71%
| Instrument | Last | Change | YoY | Prev. | High | Low | Volume |
|---|---|---|---|---|---|---|---|
| COLCAP | 2,238.99 | -1.13% | — | 9.04 | 9.05 | 9.02 | 4,133 |
| USD/COP | 3,565 | -0.61% | -13.55% | 3,587 | 3,572 | 3,563 | — |
| BRENT | 94.63 | -3.25% | +45.90% | 97.81 | 97.57 | 94.61 | 12,142 |
| WTI | 92.80 | -3.35% | +47.65% | 96.02 | 95.91 | 92.76 | 57,006 |
| ECOPETROL | 15.58 | -2.50% | +80.53% | 15.98 | 16.11 | 15.56 | 2,464,120 |
| BANCOLOMBIA | 72.25 | -2.03% | +65.79% | 73.75 | 73.34 | 72.19 | 372,460 |
| GRUPO AVAL | 4.98 | +0.81% | +71.72% | 4.94 | 5.07 | 4.80 | 250,655 |
| TECNOGLASS | 42.31 | -3.29% | -50.40% | 43.75 | 43.89 | 41.90 | 306,505 |
| CREDICORP | 327.42 | -4.80% | +53.35% | 343.93 | 343.31 | 327.42 | 818,472 |
| BUENAVENTURA | 33.86 | -2.67% | +109.40% | 34.79 | 34.50 | 33.48 | 813,077 |
| SOUTHERN COPPER | 196.59 | -2.37% | +117.37% | 201.37 | 199.95 | 193.09 | 1,009,826 |
02 The Polymarket Flip — What It Means
COLCAP Colombia today enters Monday’s session with the prediction market having flipped: Cepeda at 42%, Valencia at 30%. This Colombia stock market report covers the political shift that occurred over the long weekend and its implications for the COLCAP’s trajectory. Two weeks ago, this series described the election as a “binary where a Valencia victory triggers a re-rating and a Cepeda victory validates the policy framework that drove the selloff.” The Polymarket shift toward Cepeda is the most market-negative development since the Santa Marta conference. This is part of The Rio Times’ daily coverage of Latin American equity markets.
The Polymarket shift is driven by two dynamics. First, the right-wing vote is structurally split: Valencia (center-right, Uribista institutional base, Conservative Party endorsement) and de la Espriella (far-right, populist outsider, Bukele-style) compete for overlapping but distinct voter pools. The April AtlasIntel poll shows all three candidates at 26–28% — meaning neither right-wing candidate can break away while both remain in the race. Second, Cepeda’s organizational base (the Pacto won first place in most major cities in the March 8 congressional elections) provides a floor of support that Valencia’s institutional endorsements and de la Espriella’s personality-driven campaign cannot match in urban areas.
The market-positive counterargument: the 8:1 right-wing primary turnout gap (7 million vs 830,000) suggests conservative voters are more motivated. The runoff (June 21) is almost certain, and in a head-to-head, right-wing consolidation behind whichever candidate advances would likely defeat Cepeda — just as the right consolidated against Petro in 2022 (though Petro still won). The COLCAP’s trajectory in May depends on which dynamic dominates: Cepeda’s first-round lead, or the right’s runoff consolidation potential.
03 Petro’s Constituent Assembly Call
Petro’s May Day rally call for a constituent assembly is his most ambitious final-month maneuver — surpassing even the ISDS withdrawal and the Santa Marta conference. A constituent assembly can rewrite the constitution, which is why Petro frames it as adding “two chapters” for social reforms and anti-corruption. The mechanism requires Congressional approval or a referendum — neither of which Petro can achieve in 27 days. But the signal matters: by placing the constituent assembly on the national agenda, Petro pressures whichever candidate wins to address whether they will pursue or reject it.
Cepeda’s immediate distancing (“not a priority”) is the most important political signal of the weekend. If the Pacto candidate will not commit to the constituent assembly, the market’s worst-case scenario — a Cepeda presidency that rewrites the constitution — is less likely. A Cepeda presidency that governs moderately within the existing framework, using Pacto’s congressional strength to advance incremental social spending but not constitutional restructuring, would be tolerable for markets. The distinction between Petro-style radicalism and Cepeda-style incrementalism is the question the market will spend the next 27 days pricing.
04 The Security Dimension
NPR’s April 28 report on the pre-election violence wave adds a third variable to the COLCAP’s calculus. A roadside bomb killed 21 in southern Colombia. Rebel attacks are escalating in the southwest. Armed groups have expanded from 15,000 to approximately 22,000 fighters under Petro’s Total Peace program. Security is now the number-one voter concern — a dynamic that historically benefits right-wing candidates in Colombia. De la Espriella’s “cancel peace talks, build 10 megaprisons” platform is the most explicit security pitch; Valencia’s Uribista heritage provides the institutional security credential. If the violence escalates further in the next 27 days, it could narrow the right-wing split by pushing voters toward whichever candidate is perceived as strongest on security.
05 Technical Position — Entering May
The COLCAP at 2,178 enters Monday with Thursday’s +1.54% marubozu bounce as the last price action. The RSI signal at 38.34 has recovered from the 31.56 exhaustion level but remains deeply oversold. The MACD histogram at −23.32 is still deepening. The close at 2,178 sits on the lower Bollinger Band. The 200-day SMA at 2,224 (2.1% above) is the first meaningful resistance. The 2026 low at 2,145 is the floor. The Polymarket shift toward Cepeda could erase Thursday’s bounce on Monday if the market reprices the election odds. Alternatively, if Cepeda’s distancing from the constituent assembly is read as moderation, the bounce could extend toward the 200-SMA.
06 Key Levels
| Level | MSCI COLCAP |
| Cloud bottom | 2,254.12 |
| 200-day SMA (regime threshold) | 2,224.22 |
| Last Close / Lower BB | 2,178.00 |
| 2026 Low | 2,144.99 |
| Long-term trendline | ~2,100 |
07 Looking Ahead
Monday’s session is the market’s first opportunity to price the weekend’s developments: the Polymarket flip, the constituent assembly call, and the violence escalation. A hold above 2,178 with a second consecutive gain would confirm the bounce from 2026 lows and target the 200-SMA at 2,224. A fade below 2,155 would classify last week’s bounce as a dead-cat rally and retest the 2,145 low. The election is now 27 days away and the COLCAP has entered the period where every poll, endorsement, and security incident moves the index.
Key dates: May 31 — Presidential first round (27 days). June 21 — Runoff (almost certain). Polymarket: Cepeda 42%, Valencia 30%, de la Espriella ~15%. Conservative Party → Valencia endorsed. Constituent assembly call — symbolic but not actionable in 27 days.
08 Verdict
The COLCAP enters May at 2,178 with the political landscape transformed. Polymarket’s flip — Cepeda at 42%, Valencia at 30% — is the most significant development since the selloff began. If the market was previously pricing a Valencia-favored election with Petro’s policy damage as the downside, it must now price a Cepeda-favored election where the policy framework continues. Petro’s constituent assembly call adds rhetorical damage, though Cepeda’s distancing from it provides a moderation signal. The pre-election violence wave may shift voters toward security-focused right-wing candidates, but the right-wing split (Valencia vs de la Espriella) remains the structural barrier to consolidation.
Bias: Bearish — Polymarket shift toward Cepeda reprices the election risk. The COLCAP at 2,178 bounced from 2026 lows on Thursday — but that was before the Polymarket flip. Monday’s session will reveal whether the market treats the shift as a reason to sell (Cepeda means policy continuity) or as already priced (the 14-session, −8% decline already discounted a competitive Cepeda). The 2,145 low is the floor. The 200-SMA at 2,224 is the ceiling. The election — 27 days — decides everything. The right-wing split is the COLCAP’s structural headwind. If de la Espriella exits or endorses Valencia, the index re-rates immediately. Until that happens, Cepeda is the frontrunner, and the COLCAP prices accordingly.
Related coverage:
May Day rally: Petro’s Final May Day — Constituent Assembly Call
Pre-election violence: Colombia’s Election Takes a Tense Turn (NPR)
Election tracker: AS/COA Colombia Presidential Election Poll Tracker
Previous COLCAP: COLCAP Bounces 1.54% From 2026 Low
This report is for informational purposes only and does not constitute investment advice. Always consult a licensed financial advisor. Past performance does not guarantee future results. Published by The Rio Times.