Top 10 S&P 500 stock winners since Election Day

Many large U.S. companies have seen their stocks swell since the presidential election.

The top 10 performing stocks in the S&P 500 index saw returns of 18% or more since Election Day, according to data provided by S&P Global Market Intelligence, which analyzed returns based on closing prices from Nov. 5 to Nov. 20.

Two companies — Axon Enterprise (AXON), which provides law-enforcement technology, and Tesla (TSLA), the electric-vehicle maker led by Elon Musk, an advisor to President-elect Donald Trump — saw their stocks gain more than 35%, according to S&P Global Market Intelligence.

By contrast, the S&P 500 gained about 2% over the same period.

Investors should be cautious about buying individual stocks based on short-term boosts, said Jeremy Goldberg, a certified financial planner, portfolio manager and research analyst at Professional Advisory Services, Inc., which ranked No. 37 on CNBC’s annual Financial Advisor 100 list.

“It’s usually a bad idea,” Goldberg said. “Momentum is a powerful force in the market, but relying solely on short-term price moves as an investment strategy is risky.”

Investors should understand what’s driving the movement and whether the factors pushing up a stock price are sustainable, Goldberg said.

Lofty stock returns were partly driven by Trump administration policy stances expected to benefit certain companies and industries, investment experts said.

Deregulation and a softer view toward mergers and acquisitions are two “key” themes driving bullish sentiment after Trump’s win, said Jacob Manoukian, head of U.S. investment strategy at J.P. Morgan Private Bank.

Additionally, U.S. regulators will likely be much less stringent about allowing potential mergers during Trump’s second term, experts said.

Companies in the streaming ecosystem — like Warner Bros. Discovery (WBD), which owns the Max streaming service, and Disney+ owner The Walt Disney Co. (DIS) — may be benefactors of looser rules around consolidation, they said.

For some stocks, outperformance was tied to rosy quarterly earnings results or guidance that some companies reported around or after Election Day, experts said.

Many such businesses cited artificial intelligence as a growth driver.

For example, Palantir Technologies (PLTR), cited “unprecedented” demand for its AI platform in the third quarter, helping deliver “exceptionally strong” earnings, Treasurer and CFO David Glazer told investors Nov. 4.

Likewise, Axon beat analysts’ estimates in its Nov. 7 earnings results, with officials touting its “AI era plan” and raising earnings guidance, Goldberg said.

Axon and Palantir stocks were up…