Here's why Tesla stock is tumbling today

Tesla stock (NASDAQ: TSLA) is getting hammered on Thursday, plunging toward $400 and testing multi-month lows as a ticking regulatory clock collides with ugly demand signals and a tech selloff.

Shares have shed nearly 1% already and remain under pressure just days before a critical NHTSA deadline on March 9.

The regulators are digging into Full Self-Driving data, which could derail the robotaxi hype that's propped up the valuation.

Tesla stock: March 9 NHTSA deadline lights the fuse

The fuse is the NHTSA probe into Full Self-Driving (FSD): Tesla's advanced driver-assist system that's central to the robotaxi vision.

After two extensions, Tesla must hand over crash videos, CAN bus logs, and event data recorder files by March 9, tied to incidents involving recent FSD versions.

NHTSA started with 58 cases in October 2025; new reports pushed the total higher, and Tesla's manual review of thousands of records is straining resources.

Regulators are closely examining whether the system responded appropriately during collisions and near-miss incidents.

The requested datasets could reveal how FSD interpreted road conditions, driver inputs, and surrounding vehicles.

Safety advocates argue the probe may determine whether Tesla’s technology requires stricter oversight or additional safeguards.

Markets see this as do-or-die.

A messy submission could spark fines, recalls, or delays to unsupervised FSD and robotaxi rollout, which Musk has described as a massive long-term opportunity for Tesla.

Bulls hoped for a quiet resolution; now, traders fear escalation, especially with viral FSD clips circulating.

Volume spikes confirm conviction selling, not just rotation. Short interest is climbing, too. March 9 feels like the moment truth hits the tape.

Demand reality bites amid tech selloff

Fundamentals are piling on.

China deliveries collapsed: down double digits month over month, with wait times shrinking to 1–3 weeks from months-long backlogs.

Xiaomi's SU7 and other domestic EVs are stealing share amid nationalism and better local options. Tesla stretched financing to seven years at rock-bottom rates just to move metal.

US and Europe registrations tanked too, hit by subsidy cuts and Musk's political noise turning off buyers.

Nasdaq weakness isn't helping. Tariff jitters and AI fatigue are driving flows out of high-flyers like TSLA, trading at a very high earnings multiple on deliveries, not autonomy.

Bears like JPMorgan ($145 PT) and BNP ($280 PT) say a valuation reset is overdue as growth ex-China can't carry the multiple if robotaxi slips.

Bulls counter that a clean NHTSA outcome sparks shorts covering to $430 fast, but sentiment's souring quickly.

Tesla's tumble puts the autonomy dream on trial.

March 9 clears the air or lights the fire: regulatory green light could rally shares, but a fumble hands bears the narrative and 30% downside.