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Amprius Technologies, Inc. planned insider sales

In the last twelve months insiders at Amprius Technologies, Inc. filed 27 Form 144 notices of planned sales, 6.5 million shares worth $87.2 million at the time of filing, from 9 sellers. The latest, filed 25 August 2026: Thomas M Stepien (officer, director), 23,529 shares worth $243,313, planned for around 21 August 2026 through Morgan Stanley Smith Barney LLC.

FiledSellerRelationshipSharesValuePlanned saleSold, per Form 4BrokerHow acquiredFiling
25 August 2026Thomas M StepienOfficer, Director23,529$243,31321 August 20268,000 shares from 24 August 2026Morgan Stanley Smith Barney LLCRelease of restricted stock unitsForm 144
25 August 2026Constantin Ionel StefanOfficer29,681$306,93021 August 2026None on Form 4 yetMorgan Stanley Smith Barney LLCRelease of restricted stock unitsForm 144
25 August 2026Kang SunDirector62,101$642,18421 August 2026None on Form 4 yetMorgan Stanley Smith Barney LLCRelease of restricted stock unitsForm 144
24 August 2026Thomas M StepienOfficer, Director8,000$80,24024 August 2026None on Form 4 yetMorgan Stanley Smith Barney LLC Executive Financial ServicesRestricted Stock Vesting Under a Registered PlanForm 144
8 June 2026Dixon Donald RDirector125,000$2.4 million8 June 2026125,000 shares from 9 June 2026The Charles Schwab CorporationRestricted Stock UnitForm 144
4 June 2026Thomas M StepienOfficer, Director2,000$41,9404 June 202625,529 shares from 4 June 2026Morgan Stanley Smith Barney LLC Executive Financial ServicesRestricted Stock Vesting Under a Registered PlanForm 144
28 May 2026Kang SunDirector356$6,12127 May 202662,457 shares from 27 May 2026Morgan Stanley Smith Barney LLCRelease of restricted stock unitsForm 144
28 May 2026Constantin Ionel StefanOfficer3,208$55,15727 May 202632,889 shares from 27 May 2026Morgan Stanley Smith Barney LLCRelease of restricted stock unitsForm 144
28 May 2026Thomas M. StepienOfficer, Director4,375$75,22227 May 20264,375 shares from 27 May 2026Morgan Stanley Smith Barney LLCRelease of restricted stock unitsForm 144
26 May 2026Dixon Donald RDirector17,895$315,84726 May 202617,895 shares from 26 May 2026The Charles Schwab CorporationRestricted Stock UnitForm 144
26 May 2026Stefan Constantin IonelOfficer28,812$426,08321 May 2026No matching Form 4 saleMorgan Stanley Smith Barney LLCRelease of restricted stock unitsForm 144
26 May 2026Thomas M. StepienOfficer, Director60,702$897,68521 May 2026No matching Form 4 saleMorgan Stanley Smith Barney LLCRelease of restricted stock unitsForm 144
26 May 2026Kang SunDirector67,796$1.0 million21 May 2026No matching Form 4 saleMorgan Stanley Smith Barney LLCRelease of restricted stock unitsForm 144
1 April 2026Kang SunDirector, Officer1,500,000$25.3 million1 April 20261,567,796 shares from 1 April 2026Morgan Stanley Smith Barney LLC Executive Financial ServicesExercise of Stock OptionsForm 144
23 March 2026Kang SunDirector192,727$3.5 million23 March 2026217,869 shares from 23 March 2026Morgan Stanley Smith Barney LLC Executive Financial ServicesRestricted Stock UnitsForm 144
12 March 2026Steven ChuBoard Seat155,565$2.9 million12 March 2026155,565 shares from 12 March 2026Morgan Stanley Smith Barney LLC Executive Financial ServicesExercise of options under a registered planForm 144
12 March 2026Wen Hsuan HsiehOfficer, Director413,146$7.6 million12 March 2026413,146 shares from 12 March 2026Morgan Stanley Smith Barney LLC Executive Financial ServicesExercise of options under a registered plan; Restricted stock vesting under a registered planForm 144
10 March 2026Steven ChuBoard Seat166,632$3.0 million10 March 2026166,632 shares from 10 March 2026Morgan Stanley Smith Barney LLC Executive Financial ServicesExercise of options under a registered plan; Restricted stock vesting under a registered planForm 144
24 February 2026Stefan Constantin IonelOfficer25,366$257,71923 February 202654,178 shares from 23 February 2026Morgan Stanley Smith Barney LLCRelease of restricted stock unitsForm 144
24 February 2026Kang SunDirector61,251$622,03523 February 202661,251 shares from 23 February 2026Morgan Stanley Smith Barney LLCRelease of restricted stock unitsForm 144
21 January 2026Stefan Constantin IonelOfficer717,307$8.0 million21 January 2026607,397 shares from 21 January 2026Morgan Stanley Smith Barney LLC Executive Financial ServicesExercise of Stock OptionsForm 144
16 January 2026Kang SunDirector, Officer1,018,875$10.3 million16 January 2026993,733 shares from 16 January 2026Morgan Stanley Smith Barney LLC Executive Financial ServicesExercise of Stock OptionsForm 144
12 January 2026Kang SunDirector, Officer506,267$4.8 million12 January 2026506,267 shares from 12 January 2026Morgan Stanley Smith Barney LLC Executive Financial ServicesExercise of Stock OptionsForm 144
11 December 2025Stefan Constantin IonelOfficer198,255$2.2 million11 December 2025198,255 shares from 11 December 2025Morgan Stanley Smith Barney LLC Executive Financial ServicesExercise of Stock Options; Previously Exercised Stock Options; Restricted Stock UnitsForm 144
25 November 2025Stefan Constantin IonelOfficer25,024$252,27421 November 2025No matching Form 4 saleMorgan Stanley Smith Barney LLCRelease of restricted stock unitsForm 144
25 November 2025Kang SunOfficer, Director68,655$692,13221 November 2025No matching Form 4 saleMorgan Stanley Smith Barney LLCRelease of restricted stock unitsForm 144
17 November 2025Kang SunDirector, Officer1,000,000$11.3 million17 November 20251,068,655 shares from 17 November 2025Morgan Stanley Smith Barney LLC Executive Financial ServicesExercise of Stock OptionsForm 144
A Form 144 is the notice an insider files with the SEC before selling restricted or control shares over the Rule 144 thresholds; it says what may be sold, not what was.
Read moreValue is the filer's own aggregate market value. Sold, per Form 4: the same seller's open-market sales on Form 4 from the notice's date to 90 days after, added up, as they appear on the insiders page; a holder who files no Form 4, such as some large holders, never shows one. What is a Form 144?