SanDisk Lock-Up Expires as Micron's Capex Bomb Rattles the Memory Trade

The Lock-Up Catalyst

At market open on March 20, a 31-day lock-up agreement expired on 2,033,708 SanDisk common shares held by company directors, officers, and Western Digital Corporation. The restriction — imposed by J.P. Morgan Securities as part of WDC's $3.17 billion secondary offering in mid-February — prevented insiders from selling, pledging, or transferring economic ownership of those shares for just over a month.

The timing was brutal. Western Digital had already fully exited its SanDisk stake by February 18, selling 5.82 million shares at $545 each and retaining only 1.69 million for distribution to WDC shareholders. But those remaining shares, plus over 340,000 held by SanDisk insiders, were locked until today. With the restriction lifted, the market had to price in the possibility that two million shares could hit bids at any moment — and on a stock up 132% year-to-date, the incentive to take profit is obvious.

Micron's Capex Bomb Hit the Whole Sector

The lock-up alone might not have caused this much volatility. But it landed one day after Micron's March 18 earnings call, which crushed estimates — revenue of $23.86 billion (up 196% YoY), non-GAAP EPS of $12.20 versus $8.73 consensus — and still sent MU shares down 7%.

The culprit was capex. CEO Sanjay Mehrotra raised FY2026 capital spending guidance from $20 billion to over $25 billion, with an even larger step-up flagged for FY2027 as construction intensifies on the company's Boise mega-fab. To maintain a 25% market share target in High Bandwidth Memory and satisfy CHIPS Act domestic manufacturing requirements, Micron is building at a pace that made the market flinch. The fear is straightforward: if every memory company is spending at this rate, the structural shortage that has powered NAND pricing could flip to overcapacity by 2028.

The broader indices compounded the pressure. The S&P 500 fell 1.85% and the Nasdaq 100 dropped 2.26% on March 20, with sector rotation out of memory chips accelerating as funds took profits in the highest-beta names. SanDisk, having outperformed every other large-cap tech stock in Q1, was a natural target.

Why the Perp Held Flat

Despite the spot stock dipping below $740 intraday — roughly a 5% drawdown from the prior close of $772 — the SNDK perp on Hyperliquid settled near $764.80, effectively unchanged over 24 hours. The wide intraday range ($692–$780) tells the real story: this was a session of aggressive two-way flow, not a one-directional selloff.

Part of the resilience comes from the underlying fundamentals that haven't changed. SanDisk's Q2 FY2026 earnings were massive — $3.03 billion in revenue, 61% YoY growth, and Q3 guidance calling for $4.4–4.8 billion with gross margins of 65–67%. The NAND shortage is real and extends through at least 2028. Buyers stepped in on the dip because the supply-demand picture for flash memory hasn't actually deteriorated — what changed is the market's willingness to pay 30x earnings for a cyclical semiconductor name when the capex cycle is accelerating.

Analyst sentiment remains firmly bullish. Citigroup and KGI Securities both issued upgrades even as the stock was selling off, and all 14 covering analysts still rate SNDK a buy with price targets up to $1,000.

What to Watch

The lock-up shares are now free, but that doesn't mean they'll all hit the market immediately. Watch SEC Form 4 filings over the next two weeks for insider selling activity — one director already sold 3,500 shares for tax purposes ahead of the expiration, and more activity is likely.

The bigger question is whether the Micron capex narrative becomes the dominant framework for memory stocks. If the market decides the supercycle is peaking, SNDK's 132% YTD gain makes it one of the most crowded longs in tech — and crowded longs unwind fast. But if the Q3 earnings in late April confirm that 65%+ gross margins are real and demand is still outstripping supply, this pullback will look like noise in a structural trend.

For now, the perp is pricing this as a shakeout, not a reversal.