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American Superconductor Corp. (AMSC)

American Superconductor Corp. (AMSC) Insider Trading

Directors, officers and holders of more than 10% of AMSC report their trades in its stock on SEC Form 4, within two business days. Each row below is one Form 4 transaction line. The one-letter code says what kind of transaction it was: only P (purchase) and S (sale) are open-market or private trades; awards, option exercises, tax withholding and gifts carry other codes.

Recent Form 4 transactions

The 50 most recent of 67 transactions on file: 0 with code P, 39 with code S and 11 with other codes.

DateInsiderCodeShares
Sep 18, 2026Littlefield Barbara G.A Award1,607
Jun 11, 2026McGahn Daniel PS Sale11,508
Jun 11, 2026Kosiba John W JRS Sale1,743
Jun 11, 2026Kosiba John W JRS Sale5,026
Jun 11, 2026Dambier Laura A.S Sale4,000
Jun 11, 2026McGahn Daniel PS Sale4,609
Jun 8, 2026Kosiba John W JRS Sale1,549
Jun 8, 2026Kosiba John W JRS Sale3,286
Jun 8, 2026McGahn Daniel PS Sale4,678
Jun 8, 2026McGahn Daniel PS Sale4,992
Jun 3, 2026McGahn Daniel PS Sale500
Jun 3, 2026McGahn Daniel PS Sale4,501
Jun 3, 2026McGahn Daniel PS Sale7,075
Jun 3, 2026Kosiba John W JRS Sale3,200
Jun 3, 2026Kosiba John W JRS Sale609
Jun 3, 2026Kosiba John W JRS Sale2,638
Jun 3, 2026McGahn Daniel PS Sale817
Jun 2, 2026McGahn Daniel PS Sale13,762
Jun 2, 2026Kosiba John W JRS Sale600
Jun 2, 2026Kosiba John W JRS Sale12,036
Jun 2, 2026Kosiba John W JRS Sale12,122
Jun 2, 2026Kosiba John W JRS Sale5,704
Jun 2, 2026McGahn Daniel PS Sale28,558
Jun 2, 2026McGahn Daniel PS Sale27,900
Jun 2, 2026McGahn Daniel PS Sale2,305
Jun 1, 2026Kosiba John W JRA Award30,000
Jun 1, 2026McGahn Daniel PA Award60,000
Apr 3, 2026House Arthur HA Award3,116
Apr 3, 2026Donnelly Terence RobertA Award2,665
Apr 3, 2026OLIVER DAVID R JRA Award3,116
Apr 3, 2026Littlefield Barbara G.A Award3,116
Apr 3, 2026Klein Margaret D.A Award3,116
Apr 3, 2026Dambier Laura A.A Award3,116
Feb 24, 2026OLIVER DAVID R JRS Sale200
Aug 8, 2025House Arthur HS Sale9,703
Aug 6, 2025House Arthur HM Exercise9,703
Aug 6, 2025House Arthur HM Exercise9,703
Aug 4, 2025McGahn Daniel PS Sale27,743
Aug 4, 2025Kosiba John W JRS Sale34,260
Aug 4, 2025Kosiba John W JRS Sale15,740
Aug 4, 2025Kosiba John W JRS Sale9,843
Aug 4, 2025McGahn Daniel PS Sale73,105
Jun 11, 2025Kosiba John W JRS Sale300
Jun 11, 2025McGahn Daniel PS Sale12,315
Jun 11, 2025McGahn Daniel PS Sale500
Jun 11, 2025Kosiba John W JRS Sale6,342
Jun 6, 2025McGahn Daniel PS Sale7,689
Jun 6, 2025Kosiba John W JRS Sale4,744
May 27, 2025Kosiba John W JRS Sale10,097
May 27, 2025Kosiba John W JRS Sale39,903

The full Form 4 history is on the AMSC company page (Insider Trades card, View all).

Questions about this data

Which insider transactions are open-market trades?

Code P (open market or private purchase) and code S (open market or private sale). Code F is shares withheld to pay tax on vesting stock, A is an award from the company, M and X are option exercises and G is a gift. None of those is the insider choosing to buy or sell in the market.

How quickly are insider trades reported?

A Form 4 is due before the end of the second business day after the trade. The date shown is the transaction date from the form.

Who has to file Form 4?

Officers, directors and beneficial owners of more than 10% of a class of the company’s registered equity, under Section 16 of the Securities Exchange Act.

Look up any code in the Form 4 transaction code reference, or read Form 4 codes explained.