PAM vs VIST: Which Is the Better Buy in 2026?

Same yardstick, side by side (as of August 2026). Valuation lined up like this is most meaningful for two names in the same corner of the market, which these are. Figures are approximate; verify before investing.

The metrics above tell you which is the marginally better business. The bigger risk for most people is not picking the slightly worse stock, it is over-concentrating. PAM and VIST share themes, so owning both, or adding either to what you already hold, can quietly push a large share of your portfolio into one bet.

This is the part a generic comparison page cannot answer, because it depends on what you own. Connect your brokerage and Walnut shows your real, combined PAM and VIST exposure, flags overlap with your existing positions, and tells you if adding one would tip you past a concentration you are comfortable with, read-only by default, with your login staying at your broker. Walnut is not an investment adviser.

Pampa Energía S.A. runs three businesses that feed each other. Upstream, it produces natural gas and, increasingly, shale oil in Neuquén province, where the Rincón de Aranda block in Vaca Muerta has become the growth engine: total output reached a record ~107.5 thousand barrels of oil equivalent per day in the second quarter of 2026, with crude up ~194% year over year to ~23.4 thousand barrels per day. Downstream and alongside, it owns roughly ~5,500 MW of thermal and wind generating capacity, a petrochemicals arm producing styrene, polystyrene and synthetic rubber, and equity interests in the regulated wires and pipes: half of Citelec, the controlling holder of high-voltage transmission operator Transener, plus a stake in gas transporter TGS through CIESA. Americans do not buy the ordinary shares. They buy ADSs on the NYSE, each one representing 25 Buenos Aires ordinary shares.

Full PAM guide

Vista Energy, S.A.B. de C.V. is an oil and gas exploration and production company incorporated in Mexico that operates almost entirely in Argentina, where it is the leading independent (non-state) producer in the Vaca Muerta shale formation in the Neuquen basin. It was founded in 2017 by Miguel Galuccio, a former chief executive of Argentina's state oil company YPF, and it makes money by drilling horizontal shale wells, producing crude oil and natural gas, and selling that output into the Argentine domestic market and, increasingly, export markets. Vista is a growth-focused pure-play: it reinvests most of its cash flow into new wells and acreage rather than paying a large dividend.

Full VIST guide

Both fit overlapping themes, but they are not interchangeable. The useful comparison is which set of drivers and risks you want exposure to.

• PAM drivers: Rincón de Aranda and the shale oil ramp; Gas volumes with captive demand behind them.
• VIST drivers: Vaca Muerta production growth; La Amarga Chica and acreage expansion.

A faster-growing, richer-valued name usually swings harder, so it suits a longer horizon and a higher tolerance for volatility; a steadier, more cash-generative business suits a more conservative or income-minded investor. The honest test is which set of risks you could hold through a drawdown: The whole position rests on Argentine macro policy, where currency devaluation and capital controls have repeatedly made it hard for foreign holders to convert local cash flow into dollars at a reasonable rate. For VIST, vista's earnings are highly cyclical because they rise and fall with global oil and natural gas prices, which the company does not control.

Growth-minded investors who believe the theme has years to run tend to accept the richer multiple for more upside; value-minded investors lean toward the cheaper forward earnings and steadier profile. Pick PAM if you believe its drivers more; VIST if you believe its. Many investors hold both, but since they share themes, that is a concentrated bet, not diversification. Decide deliberately and check overlap. For the full detail, see the PAM and VIST guides.

PAM. Every figure above is in US dollars because Pampa reports in dollars rather than pesos, with its Argentine equity affiliates inflation-adjusted before consolidation by the equity method. Screeners frequently mangle this company by mixing the ordinary-share count with the ADS price, so the sanity check is that ~1,340 million ordinary shares divided by the 25:1 ratio gives roughly 54 million ADSs. The single-digit earnings multiple is not a screening artefact: it is what Argentine listings have traded at through repeated currency and tariff cycles, and it narrows or widens with politics more than with production.

VIST. As of April 2026 Vista traded at a low single-digit-to-high-single-digit trailing earnings multiple (around 7x), a discount that reflects oil-price cyclicality and Argentine country risk rather than weak growth. Revenue, EBITDA, and reserves all grew sharply in 2025 on rising production, while enterprise value of roughly $7.6 billion reflected about $3.3 billion of net debt on top of the equity value. Figures are approximate and change with oil prices, the share price, and each quarterly report.

Headline figures (approximate, August 2026): PAM shows revenue (ttm) ~$2.42B (US dollars, Pampa's functional currency), latest quarter (q2 2026) Revenue ~$746M, up ~53% YoY; net income ~$172M, adjusted ebitda (q2 2026) ~$415M, up ~75% YoY, net income / eps (ttm) ~$570M, roughly ~$10.60 per ADS; VIST shows revenue (fy2025) ~$2.47 billion (+50% YoY), net income (fy2025) ~$719 million, adjusted ebitda (fy2025) ~$1.6 billion (~65% margin), production (q1 2026) ~135,000 boe/d (+67% YoY).

PAM and VIST are related but distinct: same themes, different businesses and risks. Neither wins in the abstract; the right pick is whichever thesis you actually believe, sized so you are not over-concentrated in one theme. Walnut can show your combined PAM and VIST exposure against your real portfolio. It is not an investment adviser.