Fonar Corp (FONR) had quite the morning, with shares rocketing higher by 24.5% to $18.25 before the market even opened. The catalyst? The company announced it's signed a definitive agreement for a take-private sale, the kind of deal that gets shareholders excited about potential premiums and exit strategies.

But Fonar wasn't alone in making big premarket moves. Nearly two dozen stocks were swinging significantly, some surging on fresh news while others gave back recent gains. Let's break down what's happening across the premarket landscape.

The Big Winners

Fly-E Group Inc (FLYE) absolutely exploded, surging 62.4% to $8.58 in premarket action. This comes after the stock declined 13% on Monday, making today's move feel like a rubber band snapping back. For context, Fly-E Group posted second-quarter results on December 18 showing a loss of $2.18 per share, which was actually an improvement from the year-ago loss of $4.65 per share.

Antelope Enterprise Holdings Ltd (AEHL) bounced back hard, rising 46.1% to $1.65 after falling 12% on Monday. The pattern of sharp reversals seems to be the theme of the morning.

Ekso Bionics Holdings Inc (EKSO) climbed 34.1% to $7.32 on some genuinely interesting corporate news. Applied Digital announced plans to spin out its cloud business and pursue a proposed business combination with EKSO to launch something called ChronoScale. These corporate reshuffling announcements tend to generate excitement about unlocking shareholder value.

Brenmiller Energy Ltd (BNRG) continued its upward momentum, rising 27.1% to $1.03 after already gaining 14% on Monday. Sometimes stocks just catch a bid and keep running.

Cemtrex Inc (CETX) gained 26.1% to $2.66 as investors celebrated the company's return to profitability. Interestingly, they managed to shrug off a going-concern warning that had weighed on shares earlier in the day. It's a classic example of markets focusing on the positive narrative when they want to.

GRI Bio Inc (GRI) rose 18.2% to $0.29 after dipping 10% on Monday, while 3 E Network Technology Group Ltd (MASK) gained 17.7% to $0.31 following a strong 42% jump on Monday. When you're trading at these price levels, momentum can build quickly.

Dermata Therapeutics Inc (DRMA) gained 6.5% to $1.98 after announcing the closing of a $12.4 million private placement priced at-the-market under Nasdaq rules. Fresh capital tends to make investors happy, especially when it extends the runway for a development-stage company.

Baidu Inc (BIDU) rounded out the gainers with a 5% rise to $133.07 in premarket trading, though no specific catalyst was immediately apparent.

The Decliners

On the flip side, Scage Future - ADR (SCAG) fell 27.3% to $1.60 after rising 5% on Monday. What goes up quickly can come down just as fast.

Interactive Strength Inc (TRNR) dropped 15.5% to $1.01 after issuing an update on its Sportstech transaction. Sometimes updates that don't contain the news investors were hoping for can trigger sharp selloffs.

CCSC Technology International Hldngs Ltd (CCTG) fell 14.4% to $0.15 after jumping 34% on Monday. Another case of Monday's enthusiasm meeting Tuesday morning's reality check.

Mink Therapeutics Inc (INKT) dipped 13.4% to $10.50 in premarket trading, while Republic Power Group Ltd (RPGL) fell 12.4% to $0.59 after jumping over 157% on Monday. When you see triple-digit gains one day, some giveback the next morning isn't exactly shocking.

Jeffs Brands Ltd (JFBR) declined 11.7% to $0.72 after dipping over 6% on Monday, extending its losing streak. Fitell Corp (FTEL) dipped 11.3% to $0.71 after gaining 10% on Monday, while Adlai Nortye Ltd (ANL) fell 9% to $1.64 after jumping 10% on Monday.

SMX (Security Matters) PLC (SMX) shares dipped 8.2% to $78.00 in premarket trading after already declining 27% on Monday. That's a rough two-day stretch for shareholders.

Finally, CryoPort Inc (CYRX) tumbled 5% to $9.10 in premarket trading, rounding out the list of notable decliners.

The premarket session often sets the tone for the regular trading day, though these early moves don't always hold once more volume enters the market. Still, they provide a useful snapshot of where investor attention and capital are flowing before the opening bell.