Stock Movers Closing Bell: Boston Scientific Tumbles, Aluminum Stocks Soar, Fannie/Freddie Surges
Mar 30, 2026
Coverage of a steep drop in a medical device maker after trial data missed expectations. A surge in aluminum and mining stocks following attacks on Middle Eastern producers. Big jumps in government-sponsored mortgage companies after a high-profile investor called them undervalued. Discussion of memory-chip weakness, a major food-distribution deal, and a bond-market rally with Fed commentary.
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Ackman Rally Sparks Massive Fannie Freddie Move
- Fannie Mae and Freddie Mac jumped after Bill Ackman's renewed bullish push.
- Ackman's Pershing Square was the largest private shareholder and he called the stocks "stupidly cheap," driving a month-long pairing and volatile OTC trading.
Aluminum Stocks Rally On Geopolitical Supply Risk
- U.S.-listed aluminum producers rose after Iran targeted Middle Eastern aluminum facilities.
- Names like Alcoa and Century Aluminum jumped roughly 8% and 7% respectively as supply risk outweighed demand concerns per JPMorgan's note.
Micron Slide Highlights Memory Market Vulnerability
- Semiconductor names, led by Micron, plunged after Google described a breakthrough that could curb storage demand.
- Micron fell nearly 10% that day and is down over 30% since its March 18 earnings that signaled higher CapEx.