Semiconductors have just rebounded for two days, who dumped 6.27M in the market betting ARM breaks below 390

Recently, this roller coaster ride in the semiconductor sector has made me nervous: ARM has been steadily declining from 407 on 6/22. On 6/26, the Philadelphia Semiconductor Index crashed over 5% in a single day, with ARM briefly touching 326 intraday and closing at 334, losing nearly 20% in just four trading days. Then, on 6/30, it rebounded along with the server CPU rally led by AMD. During the session, some people started to act—in the options flow, three ARM Buy Calls were all placed on the same $390 contract expiring on 7/24, totaling 6.27M, 2,616 contracts, with the main order alone being 6.04M. This kind of large, concentrated, same-price, same-expiry stacking sends a clear directional message: institutions are betting that this semiconductor rebound can continue, pushing ARM above 390 within a month.

I'm thinking, this trade works out to about $24 per share in premium, with a breakeven point around $414, meaning it needs to rise another 17% from the current 354 just to break even. $390 itself is 10% above the current price. With only 24 days to expiration (DTE), time is not on its side. Institutions can afford to burn that 6.27M in theta, but for a small retail investor like me following in, the time decay would hurt a lot more.

And I can't ignore the background either—on the same day, I saw someone say "NVIDIA is no longer the most expensive AI stock, AMD, Palantir, and ARM are." The valuation tension has been constant. ARM just crashed from 440 to 334, so this move looks more like an oversold bounce to me, not a trend restart.

So, I acknowledge the direction, but I won't chase such an out-of-the-money naked Call at $390. If I really want to bet, I'd use a Bull Call Spread to lower the cost—buy $390, sell a higher $420 to cap the profit, locking the maximum loss to just the net premium paid. If it doesn't rise, I won't lose everything, and if it falls below $334, it means this rally didn't hold.