Ten stocks kicked off the first trading week of December losing momentum, slashing as much as double digits amid a flurry of company-specific developments viewed negatively by investors.
Meanwhile, Wall Street’s main indices finished higher week-on-week, led by the Nasdaq, up 0.91 percent, followed by the Dow Jones with a 0.5 percent gain, and the S&P 500, inching up 0.3 percent.
This article focuses on the 10 worst-performers last week and details the reasons behind their performance. The stocks were based on the percentage change in their closing prices on November 28 and December 5, 2025.
To come up with the list, we focused exclusively on stocks with a $2 billion market capitalization and 5 million shares in trading volume.
10. Sunrun Inc. (NASDAQ:RUN)
Sunrun dropped its share prices by 13.18 percent week-on-week, as investor sentiment was dampened by a proposal to register nearly 40 million new shares.
In a filing with the Securities and Exchange Commission on Thursday, Sunrun Inc. (NASDAQ:RUN) said that it intends to register 34.7 million shares to its 2015 Equity Incentive Plan (EIP) as well as 4.2 million shares to its Employee Stock Purchase Plan (ESPP), pursuant to the provisions of the said programs.
Investors viewed the plan negatively, as it opens the door to a potential dilution over time.
In other developments, investors cut down positions in Sunrun Inc. (NASDAQ:RUN) amid the looming deadline for tax credits on clean energy investments.
Under the new rules of the One Big Beautiful Bill Act, signed into law last July, homeowners only have until December 31 to have their solar and battery installations completed to qualify for the 30 percent tax credit.
The deadline is expected to prop up sales of clean energy companies, including Sunrun Inc. (NASDAQ:RUN), as customers scramble to secure the subsidies before they expire.
9. WR Berkley Corp. (NYSE:WRB)
WR Berkley fell by 14.12 percent in the past five trading days of the month as investors resorted to profit-taking following the week prior’s surge, while in a wait-and-see mode for more catalysts to spark trading.
On Friday alone, WR Berkley Corp. (NYSE:WRB) lost as much as 7.7 percent following announcements that it sold a 12.5 percent stake to Mitsui Sumitomo Insurance Co., Ltd., pursuant to an earlier signed agreement.
Under the terms, Mitsui, as a significant shareholder, will vote pursuant to the recommendations of the Berkley family, except in circumstances where it will vote the same way regular shareholders vote overall.
Additionally, WR Berkley Corp. (NYSE:WRB) underscored that Mitsui’s stake was purchased from the company’s outstanding shares, and not directly from the Berkley Family or the company. The transaction is expected to close in the first quarter of January 2026.
In other news, WR Berkley Corp. (NYSE:WRB) declared two cash dividends to its common shareholders as of December 15, both payable on December 29.
The dividends would include $1 special cash dividend per share and 9 cents of regular quarterly dividends.
8. Alexandria Real Estate Equities, Inc. (NYSE:ARE)
Alexandria dropped its share prices by 15.86 percent week-on-week, as investor sentiment was primarily dented by its decision to slash its dividends to shareholders by 45 percent.
In a statement earlier in the week, Alexandria Real Estate Equities, Inc. (NYSE:ARE) said that it was cutting its dividends for the fourth quarter of the year by $0.60 to $0.72 apiece from $1.32 apiece previously.
The dividends are payable on January 15, 2026, to all common shareholders on record as of December 31, 2025.
“The Board’s decision to reduce the declared dividend per common share reflects the company’s commitment to fortify its already strong balance sheet, enhancing financial flexibility and preserving liquidity of approximately $410 million on an annual basis. In addition to conserving significant capital, the dividend provides an attractive yield on its common stock of 5.4 percent, based on the closing stock price on December 1, 2025,” Alexandria Real Estate Equities, Inc. (NYSE:ARE) said.
The announcement followed the company’s disappointing earnings performance in the third quarter of the year, during which it swung to a net loss attributable to shareholders of $234.9 million from an attributable net income of $164.7 million in the same period last year.
The figure brought its nine-month attributable net loss to $356.1 million, reversing a $374.5 million attributable net income in the first nine months of 2024.
Total revenues in the third quarter declined by 5 percent to $751.9 million from $791.6 million year-on-year, as income from rentals dwindled by 5 percent to $735.8 million from $775.7 million.
7. Paramount Skydance Corp. (NASDAQ:PSKY)
Paramount saw its share prices fall by 16.5 percent week-on-week as investors unloaded portfolios after losing to Netflix in a billion-dollar bidding war to acquire Warner Bros Discovery Inc.
A report by The Post last week said that Paramount Skydance Corp.’s (NASDAQ:PSKY) chief, David Ellison, sat down with officials from the White House on Wednesday to lobby against WBD’s merger agreement with Netflix, arguing that even at a higher offer, the latter’s bid must be discounted due to the uncertainty it could bring.
Prior to the meeting, Paramount Skydance Corp. (NASDAQ:PSKY) warned multiple times that Netflix’s acquisition would pose unacceptable risks to WBD shareholders.
On Friday, Netflix announced that it officially shook hands with WBD for the acquisition of the latter’s shares at $27.75 apiece, putting the equity value at $72 billion with a total enterprise value of $82.7 billion.
The acquisition would include WBD’s film studio and streaming service, HBO Max, while the latter would push forward with its previously announced spinoff of Discovery Global, which owns and operates TNT and CNN.
The transaction is expected to close after the successful separation of Discovery Global into a new publicly-traded company, which is now expected to be completed in the third quarter of 2026.
6. Cinemark Holdings Inc. (NYSE:CNK)
Cinemark capped off the first trading week of December losing 19.8 percent, as investors dumped their positions amid concerns about the impact of Netflix Inc.’s acquisition of Warner Bros Discovery Inc. (WBD) on the theatre industry.
Cinemark Holdings Inc. (NYSE:CNK) fell alongside its counterparts, namely IMAX, AMC Theatres, and The Marcus Corporation, after Netflix announced on Friday that it officially inked a merger deal with WBD for an enterprise value of $82.7 billion.
The acquisition would include its control of WBD’s content libraries, boosting the Netflix platform assets, but raising fears that it could hurt cinema companies’ profit margins.
Additionally, sentiment was dampened by Netflix co-CEO Ted Sarandos’ announcement earlier that WBD movies will continue to get a theatrical release, but underscored that “windows will evolve.”
The Directors Guild of America expressed its concern about the acquisition and said that it would meet with Netflix to address their issues.
Sentiment was further supported by the company’s disappointing earnings performance in the third quarter of the year, during which Cinemark Holdings Inc. (NYSE:CNK) slashed its attributable net income by 73.6 percent to $49.5 million from $187.8 million in the same period last year.
Total revenues also declined by 7 percent to $857.5 million from $921.8 million year-on-year, amid lower revenues from admissions and concessions.
5. Pure Storage, Inc. (NYSE:PSTG)
Pure Storage fell by 20.83 percent week-on-week as investors resorted to profit-taking following last week’s climb to the $90 territory, supported by its upbeat growth outlook for the full fiscal year.
In an updated report on Tuesday, Pure Storage, Inc. (NYSE:PSTG) said that total revenues jumped by 16 percent to $964 million from $831 million in the same period last year, on the back of strong revenues from products and subscription services.
Net income, however, declined by 13.8 percent to $54.8 million from $63.6 million year-on-year.
Encouraged by the results, Pure Storage, Inc. (NYSE:PSTG) raised its growth guidance for revenues for the full fiscal year to a range of $3.63 billion to $3.64 billion, or an implied growth of 14.5 percent to 14.9 percent year-on-year. This compares with previous expectations of $3.60 billion to $3.63 billion, or a 13.5 percent to 14.5 percent jump year-on-year.
Operating income was also expected to settle at $629 million to $639 million, versus $605 million to $625 million prior.
For the fourth quarter alone, Pure Storage, Inc. (NYSE:PSTG) expects revenues to be at $1.02 billion to $1.04 billion, or a growth rate of 16.5 percent to 17.6 percent.
Operating income is targeted at $220 million to $230 million, or a growth of 43.7 percent to 50.2 percent.
4. Parsons Corporation (NYSE:PSN)
Parsons Corp. fell by 21.29 percent week-on-week as investor sentiment was dampened by its loss of a billion-dollar air traffic control system contract to its rival, Peraton.
On Thursday, the Federal Aviation Administration said that it has awarded to Peraton—a national security company owned by Veritas Capital—its $12.5 billion contract to oversee and overhaul the US air traffic control system.
According to the FAA, Peraton possesses the capabilities that matched the project’s requirements, including integrating complex technology platforms and successful collaboration with federal government agencies.
Commenting on the decision, Parsons Corporation (NYSE:PSN) acknowledged the air traffic control system as a critical priority for the nation’s safe and secure air travel.
“Having supported the FAA for nearly 50 years, Parsons proposed a solution based on our understanding of the national airspace mission that aligned with the responsibility we have to our shareholders and employees. We stand ready to support the FAA on our existing contracts and expand our role as an implementation partner,” Parsons Corporation (NYSE:PSN) said.
“Parsons is strategically positioned to continue capitalizing on global trends, with industry-leading organic revenue growth, and a global workforce focused on mission delivery for our customers,” it added.
Following the FAA decision, investment firm Raymond James downgraded Parsons Corporation (NYSE:PSN) to market perform from strong buy previously.
3. Adaptive Biotechnologies Corp. (NASDAQ:ADPT)
Adaptive Biotechnologies fell by 24.5 percent week-on-week as investors took path from three key executives’ disposition of a significant stake in the company.
In separate regulatory filings last week, Adaptive Biotechnologies Corp. (NASDAQ:ADPT) said that Chairman and CEO Chad Robins, his elder brother, Harlan, who is currently chief scientific officer, as well as Chief Finance Officer Kyle Piskel, unloaded their portfolios in the company over the past few days.
The younger Robins alone sold $3.07 million of his shares through two rounds of share sales on November 26 and December 1, with prices averaging $18.94 to $19.68 apiece.
On November 28, Piskel followed with the sale of $3.17 million of his shares, covering 162,820 at a price of $19.5 apiece. However, he also acquired worth $1.25 million of new shares at a price of $6.55 to $12.14 apiece.
Meanwhile, the elder Robins disposed of $672,515 worth of shares in the company at a price of $16.61 to $18.61 each.
Adaptive Biotechnologies Corp. (NASDAQ:ADPT) said that the transactions were in line with the Rule 10b5-1 trading plan adopted in August this year.
Typically, ordinary investors view insider selling in a negative light due to business concerns, although some transactions are only caused by profit-taking, diversification, and other personal reasons, among others.
2. Symbotic Inc. (NASDAQ:SYM)
Symbotic capped off the first trading week of the month, losing 28.7 percent as investors sold off positions amid the potential dilution impact of its plans to issue 10 million new shares to the public.
In a statement during the week, Symbotic Inc. (NASDAQ:SYM) announced plans to sell 6.5 million Class A shares, while its existing investor, SoftBank Group Corp., would dispose of 3.5 million of its shares in the company.
Symbotic Inc. (NASDAQ:SYM) has yet to identify the official price, although the offer could generate at least $500 million.
Symbotic Inc. (NASDAQ:SYM) said that it would only gain from the 6.5 million shares, with net proceeds expected to be used for general corporate purposes. SoftBank Group, on the other hand, will take all earnings from the 3.5 million shares.
In line with the offer, Symbotic Inc. (NASDAQ:SYM) would grant its underwriters a 30-day option to purchase up to an additional 1.5 million shares at the public offering price.
In other developments, the company on Tuesday earned a “sell” recommendation from Goldman Sachs, alongside a new price target of $47.
1. American Bitcoin Corp. (NASDAQ:ABTC)
American Bitcoin nosedived by 47.4 percent week-on-week, as investors sold off positions following the expiration of a lockup period, while presidential son and co-founder Eric Trump pointed to profit-taking as having dragged down its share price.
“Our pre-merger private placement shares unlocked—these early investors are freely available to cash in on their profits for the first time, which is why we will see volatility,” Trump posted on his social media account.
“I’m holding all my @ABTC shares—I’m 100 percent committed to leading the industry,” Trump added.
In other recent news, American Bitcoin Corp (NASDAQ:ABTC) swung to a net profit of $3.47 million from a $576 million net loss in the same period last year. Revenues soared by 453 percent to $64.22 million from only $11.61 million year-on-year.
“The third quarter validated the thesis behind American Bitcoin,” said Trump.
“While others paid spot, we generated Bitcoin below market through scalable, asset-light mining operations. Coupled with disciplined at-market purchases, we added more than 3,000 Bitcoin to our reserve. This dual strategy is how we intend to compound value for our shareholders and solidify our position as a capital-efficient platform for long-term Bitcoin accumulation,” he noted.
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