Ambiq's CEO filed a $1.1M tax sale; his own form shows $11M already sold

A tax label on the eighth sale

At 4:07pm on 2 October, the SEC's EDGAR system accepted a Form 144↗ from Fumihide Esaka, Ambiq Micro's chief executive and a director ¹². The notice proposes selling 16,560 shares worth $1,145,124 through Morgan Stanley, and its only explanation reads like housekeeping: a "sell-to-cover transaction for taxes owed" on restricted stock units ¹.

Analysts put the stock five from the top

A day earlier, the Roundtable 100 ranked Ambiq fifth among 100 technology growth assets↗ with a score of 63; Nvidia sat 61 places lower at No. 68, scored 23, its $5.5 trillion market cap against Ambiq's $1.6 billion ³. AMBQ closed 2 October at $68.18, down 1.4 percent, and the ticker's news feed still asks whether it can rally 40.96 percent as Wall Street expects ⁴. The ranking's publisher discloses that it ranks itself among the constituents ³. A Singapore secondary listing↗ followed on 30 July, where 380 shares changed hands on debut day ⁸.

The eighth sale's own form lists the first seven

The same notice carries the trailing three-month table. It lists seven completed sales between 14 August and 15 September: 185,500 shares, $11,024,010 in gross proceeds, about 0.76 percent of the 24,516,643 shares outstanding ¹. The largest, 50,000 shares for $3,167,923, cleared on 11 September ¹.

The pattern the tax label does not cover

Three lots of exactly 13,500 shares recur across the table like monthly vest covers; the 11 September block is nearly four times that size ¹. The completed sales averaged $59.43 a share, all priced between roughly $56 and $64, after the stock had already fallen from its 18 June record of $91.61 ¹⁷. EDGAR holds seven Form 144 notices from Esaka this year↗, the earliest dated 14 May ⁵.

The bull case is real, and still unprofitable

Second-quarter net sales rose 89.7 percent to $33.9 million, a fifth straight quarter of sequential growth, on $366.8 million of cash and no debt ². Esaka also signed the standard Rule 144 line that he knows of no undisclosed adverse information ¹. Even so, every quarter on the SEC record since late 2024 shows a net loss ⁶, and the filing's tax explanation attaches to the proposed sale alone.

Form 4s will show whether the eighth sale clears

Form 4 filings will show whether the newest sale executes, the Roundtable refreshes each Friday, and Ambiq has guided third-quarter net sales to $36 million or $37 million ¹²³. The tax label fits the eighth sale. The first seven carry no label at all.