American Superconductor Corporation (AMSC) Insider Trading

Over the last 3 months, AMSC insiders made 0 open-market buys and 4 sales, a net sale of -$606K (SEC Form 4). Over the last 6 months, 235 institutions increased and 124 reduced their position (13F).

Insider Activity

Sentiment
0/100
Buys (3m)
0
Sells (3m)
4
Net (3m)
-$606.0K
Insider trades by month Buys Sells
May
Jun
Aug
Nov
Feb
Jun
Context3-month price +20%Institutions accumulating (13F)
DateInsiderTypeSharesPrice
Jun 10, 2026Kosiba John W JRofficer: SVP, CFO & TreasurerSell1,549$42.35
Jun 10, 2026Kosiba John W JRofficer: SVP, CFO & TreasurerSell3,286$41.50
Jun 10, 2026McGahn Daniel Pdirector, officer: Chairman, President and CEOSell4,678$42.19
Jun 10, 2026McGahn Daniel Pdirector, officer: Chairman, President and CEOSell4,992$41.39
Apr 7, 2026Donnelly Terence RobertdirectorGrant2,665—
Apr 7, 2026Littlefield Barbara G.directorGrant3,116—
Apr 7, 2026Dambier Laura A.directorGrant3,116—
Apr 7, 2026OLIVER DAVID R JRdirectorGrant3,116—
Apr 7, 2026House Arthur HdirectorGrant3,116—
Apr 7, 2026Klein Margaret D.directorGrant3,116—
Feb 26, 2026OLIVER DAVID R JRdirectorSell200$34.10
Nov 13, 2025OLIVER DAVID R JRdirectorBuy200$8.33
Aug 8, 2025House Arthur HdirectorSell9,703$50.92
Aug 8, 2025House Arthur HdirectorOption9,703$6.80
Aug 6, 2025Kosiba John W JRofficer: SVP, CFO & TreasurerSell34,260$54.34
Aug 6, 2025McGahn Daniel Pdirector, officer: Chairman, President and CEOSell27,743$55.11
Aug 6, 2025McGahn Daniel Pdirector, officer: Chairman, President and CEOSell73,105$54.26
Aug 6, 2025Klein Margaret D.directorBuy500$5.57
Aug 6, 2025Kosiba John W JRofficer: SVP, CFO & TreasurerSell9,843$55.26
Aug 6, 2025Kosiba John W JRofficer: SVP, CFO & TreasurerSell15,740$55.13
Jun 12, 2025Kosiba John W JRofficer: SVP, CFO & TreasurerSell6,342$28.55
Jun 12, 2025McGahn Daniel Pdirector, officer: Chairman, President and CEOSell12,315$28.56
Jun 12, 2025Kosiba John W JRofficer: SVP, CFO & TreasurerSell300$29.08
Jun 12, 2025McGahn Daniel Pdirector, officer: Chairman, President and CEOSell500$29.09
Jun 9, 2025McGahn Daniel Pdirector, officer: Chairman, President and CEOSell7,689$31.82
Jun 9, 2025Kosiba John W JRofficer: SVP, CFO & TreasurerSell4,744$31.83
May 29, 2025McGahn Daniel Pdirector, officer: Chairman, President and CEOSell98,149$26.60
May 29, 2025McGahn Daniel Pdirector, officer: Chairman, President and CEOSell24,506$25.55
May 29, 2025Donnelly Terence RobertdirectorGrant2,112$27.38
May 29, 2025Kosiba John W JRofficer: SVP, CFO & TreasurerSell39,903$26.61

Source: AMSC SEC Form 4 filings, latest Jun 10, 2026. For informational purposes only — not investment advice.

Institutional activity (13F)

How institutions changed their AMSC positions over the last 6 months (SEC Form 13F).

Increased
235
New positions
75
Reduced
124
Sold out
113
Largest moves
InstitutionActionSharesFiled
BLACKROCK, INC.Increased4.0MMay 13, 2026
BLACKROCK, INC.Increased3.8MFeb 12, 2026
VANGUARD GROUP INCIncreased3.5MJan 29, 2026
VANGUARD CAPITAL MANAGEMENT LLCNew Position2.0MMay 15, 2026
VANGUARD PORTFOLIO MANAGEMENT LLCNew Position1.7MMay 8, 2026
BAILLIE GIFFORD & COIncreased1.5MJan 23, 2026
BAILLIE GIFFORD & COReduced1.4MMay 8, 2026
STATE STREET CORPIncreased1.3MMay 15, 2026
STATE STREET CORPIncreased1.2MFeb 13, 2026
GEODE CAPITAL MANAGEMENT, LLCIncreased1.2MMay 15, 2026
BARROW HANLEY MEWHINNEY & STRAUSS LLCNew Position1.1MMay 13, 2026
GEODE CAPITAL MANAGEMENT, LLCIncreased1.1MFeb 9, 2026
ATREIDES MANAGEMENT, LPIncreased1.0MFeb 17, 2026
NUVEEN, LLCIncreased1.0MApr 30, 2026
NUVEEN, LLCIncreased961KFeb 12, 2026

Source: SEC Form 13F filings. For informational purposes only — not investment advice.

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