US. Rep. Nancy Pelosi, one of Congress' top stock traders, has added a new AI play to her portfolio.

Pelosi (D., Calif.) has invested in Bloom Energy, which makes fuel cell systems to power data centers and other large tech manufacturing facilities onsite, according to her most recent financial disclosures.

The filing, signed by Pelosi on Aug. 21, showed purchases of 15,000 shares of Bloom Energy and 200 call options. The energy stock has emerged as a beneficiary of the AI-driven surge in demand for power.

Bloom Energy, based in San Jose, Calif., was up as much as 4.2% on Monday after Pelosi's financial disclosure was released. The stock has more than doubled since the start of 2026.

The filing, which indicates Paul Pelosi is the owner of the accounts that the transactions were executed through, reported a purchase of 10,000 shares of Bloom Energy on July 24.

The filing lists the transaction amount as within the $1,000,000 and $5,000,000 range. Bloom Energy traded at $184.89 per share on July 24, suggesting Pelosi's reported purchase cost roughly $1.8 million.

The filing also listed a purchase of 100 call options with a strike price of $100, expiring in June of 2027, also within the $1,000,000 and $5,000,000 range.

Pelosi bought another 5,000 shares on July 28, listed as being between $500,000 and $1 million. Bloom shares were at $166.84 on July 28, which puts the value of Pelosi's 5,000 share purchase at roughly $830,000. Along with the additional shares, Pelosi purchased 100 more call options, valued as being at least $1 million and under $5 million.

The former speaker of the House is known for her savvy Wall Street trades, often outperforming the major indexes. This has created both critics and copycats.

"For better or worse, she is the poster child for what a lot of folks just assume is insider trading [or] using your position of power and access to information to make stock moves that ultimately profit you that are not available to the general public," Casey Burgat, the director of the George Washington University Graduate School of Political Management's legislative affairs program, told Barron's.

Pelosi has consistently denied accusations of insider trading.

A spokesperson for Pelosi's office provided a statement on the disclosure, saying "Speaker Pelosi does not own any stocks and has no knowledge or subsequent involvement in any transactions."

The office also referred Barron's to Pelosi's support of banning congressional stock trading in an effort to support transparency and accountability for elected officials. Pelosi has disclosed millions of dollars of transactions since voicing support of a ban.

The New York Times, in an analysis published earlier this month, identified Pelosi as being among the biggest stock traders in Congress.

Pelosi's success as an investor has sparked the creation of tools that mirror her trading activity based on the financial disclosures. For example, the "Pelosi Tracker" portfolio via Autopilot has over 20,000 "copiers" trading an estimated $44 million, according to the tracker's website.

The filings that feed these tools and that showed Pelosi's new stake in Bloom Energy is required by law. Congressional officials like Pelosi are required to disclose trades over $1,000.

These disclosures require officials, along with their spouses and any dependent children, to report the underlying asset, whether they bought or sold, and categorize the transaction based on dollar amount ranges.

The disclosure is required within 45 days of the transaction or within 30 days of being notified of a transaction within their accounts, which ever comes first. If congressional officials don't disclose their trading activity within the required time frame they are charged a fine of $200.

The filings are required after the STOCK Act was passed into law in 2012.

"It's an effort to maintain transparency about government actors' financial activities," Burgat explained, noting that in reality the current legislation is lacking when it comes to enforcing transparency.

Kedric Payne, a lawyer who leads the ethics program at the nonprofit Campaign Legal Center, said that "when it comes to congressional stock trading, the problem is that the public perceives that lawmakers may be using information they receive in their official capacity for self-enrichment,"

Payne outlined that even if there isn't actual insider trading or other misconduct happening, the public perception that officials are trading on nonpublic information fuels investors imitating the trades documented in politicians' disclosures.

"That chips away at the integrity of the market because it is assumed that anything that lawmakers buy will increase in value if people start chasing lawmakers trades instead of chasing the value of the actual stock," he added.

Bloom Energy did not immediately respond to Barron's request for comment.