8 Key Items Shaping the Stock Market Tuesday: Iran Shows 'No Sign' of Compliance

Trump

These are the early headlines and other items poised to influence the market at the start of the trading day. As we share this collection of market drivers, U.S. equity futures point to a lower market open later on Tuesday morning.

1. Iran showed no sign of agreeing to U.S. President Donald Trump's demand that it open the Strait of Hormuz by the end of Tuesday or suffer massive attacks on its civilian infrastructure, in what would be the biggest escalation yet of the war. A senior Iranian source told Reuters that Tehran had ‌rejected a proposal conveyed by intermediaries for a temporary ceasefire. Talks on a lasting peace could begin only after the U.S. and Israel end their strikes, provide a guarantee they will not resume and offer compensation for damages. (Reuters)

As of early on Tuesday morning, indications are that Trump’s deal deadline, set at 8 p.m. ET tonight, is likely to come and go. That has markets bracing to see if the president follows through and “obliterates” Iran’s power plants and bridges, and what the Iranian response will be. That potential escalation and uncertainty are putting investors back in a risk-off and more cautious mood as oil prices move higher. Should the market need to reset its duration and follow through expectations for higher energy prices and supply chain disruptions, the risk we see for 1H 2026 EPS expectations for the S&P 500 steps up as well. We’ll continue to let the Portfolio’s market-hedging positions do their job.

2. The Trump administration will raise payments to Medicare insurers by 2.48% next year, a dramatic increase after a preliminary proposal holding the line on payments drew fierce criticism from the industry and torpedoed shares of the largest companies. The final 2027 rates for Medicare Advantage, the private-insurer version of the federal program for seniors and the disabled, came in above some analysts’ expectations. Several had suggested a rate increase would likely be finalized at around 1% or slightly higher, with a “bull” case closer to 2% to 3%. (WSJ)

This announcement is lifting beaten-up health insurance stocks such as United Health (UNH) , Elevance (ELV) and others on Tuesday morning following their collective drop in January. That elevator ride was fueled by the proposed 0.09% rate increase. Under the final rate, insurance plans will collect an additional $13 billion in payments from the government in 2027, and that is going to trigger some short covering in the shares of these health insurance plan companies. We see the flow through benefitting our position in Labcorp (LH) shares.

3. Anthropic PBC said its revenue run rate has now topped $30 billion, up from $9 billion at the end of 2025, and confirmed plans to work with Broadcom Inc. and Google to power its burgeoning operations. The AI startup said that demand for its Claude services has accelerated this year, with more than 1,000 business customers spending over $1 million on an annual basis. That figure has more than doubled since February. (Bloomberg)

That is a substantial jump in revenue at Anthropic. Many will point out that revenue run rate has eclipsed OpenAI, which in early March shared its annualized revenue topped $25 billion. While that may be true, our take is that both announcements speak to the accelerated pace of AI adoption and usage. That keeps us bullish on our digital infrastructure plays in the Portfolio. Confirmed plans by Anthropic to work with Google (GOOGL) and Broadcom (AVGO) bring another layer of conviction for those AI chip efforts.

It also backs the significant ramp in the custom AI chip business Broadcom discussed in early March. While Marvell (MRVL) shares are trading off, let’s remember it too is working with Google and its custom AI chips rather than fall into herdthink that, for one company to win, another has to lose, in a rising tide environment.

4. Samsung Electronics Co. earned a far stronger-than-expected eight-fold leap in quarterly profit, underscoring robust demand for AI memory chips in the face of markets roiled by war in the Middle East. Customers led by cloud service providers are ramping up orders for high-bandwidth memory and other chips used in data centers to feed artificial intelligence services, lifting both volumes and margins at the chips-to-smartphones conglomerate. (Bloomberg)

While Samsung (SSNLF) will not release its full Q1 2026 results until April 30, this announcement bodes very well for the recent addition of Micron (MU) shares we picked up as part of the recent EPS Diplomats reconstitution. In mid-March, as part of its latest quarterly earnings report, Micron shared it expects its capex to “step up meaningfully to support HBM- and DRAM-related investments,” a comment that shaped our decision to add shares of Applied Materials (AMAT) to our holdings. Inside Samsung’s full quarterly results, its capex comments will be top of mind for us.

5. Bill Ackman’s Pershing Square Capital said it had made an offer to buy Universal Music Group in a deal that values the company at around $60 billion, the latest attempt by the activist investor to land the world’s largest record label. The deal for the label behind Bad Bunny, Taylor Swift and the Beatles, if approved, would close by the end of the year and would involve Universal merging with Pershing Square Sparc Holdings, a specially-created acquisition vehicle. (WSJ)

While the asset lite and royalty aspect of Universal’s business model is of interest to us, our main interest in this is what it means for M&A activity and fees relative to market expectations for the coming quarters. Jefferies (JEF) has been named as the investment bank working with Ackman, now to see which ones are retained by Universal.

6. Amazon.com on Monday announced it reached a new agreement with the U.S. Postal Service on package deliveries, and sources said the cash-strapped mail system would retain about 80% of its ‌existing deliveries from its biggest customer. That 20% cut is a dramatically better outcome for the postal agency than the two-thirds or larger reduction that Reuters reported last month Amazon had threatened. (Reuters)

Several weeks back, when Amazon (AMZN) shared it was planning to “significantly reduce” its reliance on the U.S. Postal Service (USPS), we suspected this was partly a negotiating tactic but also part of Amazon’s accelerated shift to same-day and next-day delivery. Given the continued net losses by USPS since 2007, the outcome shouldn’t be that surprising. We’ll look to see if and how the new terms of the new agreement square with Amazon’s cost reduction targets.

7. Economic data today per TipRanks: LMI Logistics Managers Index (March), ADP Employment Change (Weekly), Durable Orders (February), Consumer Inflation Expectations (March)

8. Companies reporting today per TipRanks: PM – Greenbrier (GBX) , Levi Strauss (LEVI)

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At the time of publication, TheStreet Pro Portfolio was long AMAT, AMZN, AVGO, GOOGL, LH, MRVL and MU shares.