If you put $10,000 into the VanEck Oil Services ETF (NYSEARCA:OIH) at the closing bell on December 31, 2025, you were sitting on roughly $15,100 five months later. The fund opened the year at $285 and closed June 2 at $430, a 51% year-to-date gain. Over the same window, the SPDR S&P 500 ETF Trust (NYSEARCA:SPY | SPY Price Prediction) returned 11%. The headline number on the cover of this piece (47%) is already stale on the upside. Oil services have been the trade of 2026 so far, and the gap is not subtle.
Before getting to why, one piece of texture worth keeping in mind. OIH has given back a little of that gain. The fund is down 3% over the past week and 3% over the past month, tracking a sharp pullback in crude. WTI fell 12.9% in the week ending May 26 to $98 per barrel. That softness matters for the forward look. It does not erase the YTD story.
What Actually Did the Work
OIH is a concentrated bet on the picks-and-shovels side of the energy patch, and three names carry most of the weight. Schlumberger (NYSE:SLB) is up 48% YTD, Halliburton (NYSE:HAL) is up 43%, and Baker Hughes (NASDAQ:BKR) is up 43%. When the top three constituents of a sector ETF all rip more than 40% in five months, the ETF will follow.
The catalyst is not subtle either. The Strait of Hormuz, which moved nearly 20% of global oil supply before military action that began February 28, has been effectively closed to shipping traffic since. Brent spiked to $138/b on April 7 and averaged $117/b for the month, the highest monthly print since June 2022. The EIA now estimates global oil inventories will fall by 8.5 million barrels per day in Q2 2026. When inventories drain that fast, upstream operators do two things at once. They squeeze every existing well harder, and they bid for the equipment and services that bring future barrels online. That bid lands directly in OIH.
The earnings season confirmed the through-line. SLB reported Q1 2026 revenue of $8.72 billion and committed to returning more than $4 billion to shareholders in 2026, even as CEO Olivier Le Peuch acknowledged “widespread disruptions in the Middle East impacted our business”. Halliburton beat EPS by 11% with net income jumping to $461 million from $204 million a year earlier, and CEO Jeff Miller told the call “In North America, I see clear signs that we are in the early innings of a recovery.”
Baker Hughes is the cleanest version of the structural story. The company exited fiscal 2025 with a record Industrial & Energy Technology backlog of $32.4 billion, including roughly 7 GW of power systems orders tied to data center infrastructure. That last number is the AI capex burst showing up inside an oil services ETF, and it is why BKR’s IET segment hit its 20% EBITDA margin target while the oilfield segment shrank 8% year over year. The OIH rally combines several stories: a geopolitical risk premium stacked on top of an LNG infrastructure buildout stacked on top of data center power demand stacked on top of a tentative North American drilling recovery.
What Has to Hold for the Trade to Keep Working
This is where honesty matters. The single biggest driver of the YTD move (oil at $100+) is the piece of the thesis most likely to fade. The EIA’s May Short-Term Energy Outlook projects Brent at $106/b in May and June, $89/b in Q4 2026, and $79/b in 2027. That is the agency’s base case for a world where the Strait of Hormuz traffic gradually resumes and shut-in production returns later this year. A reader holding OIH today is, whether they realize it or not, betting either that the resumption takes longer than the EIA assumes or that the structural pieces are large enough to carry the fund when the war premium bleeds out.
The structural pieces are real. SLB now does $141 million per quarter in Data Center Solutions revenue, up 45% year over year, with digital annualized recurring revenue above $1 billion. Baker Hughes has booked LNG equipment awards across NextDecade Rio Grande LNG Train 5, Commonwealth LNG, and Alaska LNG, and management is guiding to similar organic IET order levels in 2026. Halliburton flagged North America activity bottoming. SLB expects broad-based upstream recovery in 2027 and 2028. None of those depend on oil staying north of $100.
What to watch from here, in order of importance. First, Strait of Hormuz traffic data and any indication that shut-in barrels in Iraq and Qatar are coming back online. Second, the WTI tape against the EIA’s glide path. WTI sitting at $98 is already in the 86th percentile of its 12-month range, so the asymmetry on price from here favors the downside. Third, the IET orders line at Baker Hughes when it reports next, because that is the cleanest read on whether AI power demand is still pulling forward. Fourth, North American rig count and stimulation activity, the leading indicator on whether Miller’s “early innings” line holds.
A reasonable read on OIH today is that the easy money has been made, the war premium that drove ~half the move is forecast to fade, and what remains is a more interesting but lower-octane structural story about LNG, data center power, and a North American recovery that has not actually arrived yet. The headline number was real. The conditions that produced it are partly mean-reverting by design. If you came late looking for another 50%, the math now requires Brent to stay stuck above the EIA’s path, and that is a thinner thesis than the one that delivered the chart.
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