Is the AMSC CEO’s share sale a tax-related transaction?

Yes. The filing explains that the 9,670 shares sold were used to cover tax withholding obligations arising from the vesting of restricted stock awards. This makes the activity primarily compensation- and tax-driven rather than a purely discretionary portfolio change.

AMSC CEO sells shares to cover tax withholding

American Superconductor Corp. Chairman, President and CEO Daniel P. McGahn reported selling a total of 9,670 shares of common stock on June 8, 2026.

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Form Type

Rhea-AI Filing Summary

American Superconductor Corp. Chairman, President and CEO Daniel P. McGahn reported selling a total of 9,670 shares of common stock on June 8, 2026. The sales were made at weighted average prices of $41.3891 and $42.1935 per share in open-market transactions.

According to the filing, these shares were sold to cover tax withholding obligations related to vesting of restricted stock awards and were executed under a previously established Rule 10b5-1 trading plan. After these transactions, McGahn holds 1,148,046 shares directly and 13,344 shares indirectly through the company’s 401(k) plan as of June 10, 2026.

Insider Trade Summary 10b5-1

Net Seller: 9,670 shares

Net Sell 3 txns

Insider McGahn Daniel P

Role Chairman, President and CEO

Sold 9,670 shs ($404K)

Type	Security	Shares	Price	Value
Sale	Common Stock	4,992	$41.3891	$207K
Sale	Common Stock	4,678	$42.1935	$197K
holding	Common Stock	--	--	--

Holdings After Transaction: Common Stock — 1,148,046 shares (Direct); Common Stock — 13,344 shares (Indirect, By 401(k) plan)

Footnotes (5)

F1. Represents the number of shares sold by the reporting person to cover tax withholding obligations in connection with the vesting of restricted stock awards. The reported transaction was effected pursuant to a Rule 10b5-1 trading plan previously entered into by the reporting person on August 15, 2025, as modified on February 26, 2026.
F2. The sales were executed in multiple trades at prices ranging from $40.86-$41.74. The price reported above reflects the weighted average sale price. The reporting person hereby undertakes to provide, upon request, to the SEC staff, the issuer, or a security holder of the issuer, full information regarding the number of shares and prices at which the transactions were effected.
F3. The sales were executed in multiple trades at prices ranging from $41.88-$42.86. The price reported above reflects the weighted average sale price. The reporting person hereby undertakes to provide, upon request, to the SEC staff, the issuer, or a security holder of the issuer, full information regarding the number of shares and prices at which the transactions were effected.
F4. Following all the transactions reported on this Form 4, the reporting person holds 1,148,046 shares directly.
F5. Following all the transactions reported on this Form 4, the reporting person holds 13,344 shares indirectly through the company's 401(k) plan as of June 10, 2026.

Key Figures

Total shares sold: 9,670 shares First sale tranche: 4,992 shares at $41.3891 Second sale tranche: 4,678 shares at $42.1935 +5 more

8 metrics

Total shares sold 9,670 shares Common stock sold on June 8, 2026

First sale tranche 4,992 shares at $41.3891 Weighted average sale price on June 8, 2026

Second sale tranche 4,678 shares at $42.1935 Weighted average sale price on June 8, 2026

Direct holdings after sale 1,148,046 shares Direct ownership following all reported transactions

Indirect 401(k) holdings 13,344 shares Indirect ownership via 401(k) plan as of June 10, 2026

Trade plan adoption date August 15, 2025 Initial Rule 10b5-1 trading plan entry

Trade plan modification date February 26, 2026 Modification of Rule 10b5-1 trading plan

Price ranges for sales $40.86–$41.74 and $41.88–$42.86 Intraday ranges for multiple trade executions

Key Terms

Rule 10b5-1 trading plan, restricted stock awards, weighted average sale price, 401(k) plan

4 terms

Rule 10b5-1 trading plan regulatory

"The reported transaction was effected pursuant to a Rule 10b5-1 trading plan previously entered into"

A Rule 10b5-1 trading plan is a pre-arranged schedule that allows company insiders to buy or sell stock at specific times, even if they have inside information. It helps prevent accusations of unfair trading by making these transactions look planned and transparent, rather than sneaky or illegal.

restricted stock awards financial

"cover tax withholding obligations in connection with the vesting of restricted stock awards"

Restricted stock awards are company shares given to employees or executives that cannot be sold or transferred until certain conditions — like staying with the company for a set time or meeting performance targets — are met, like a gift that is locked in a safe until rules are satisfied. Investors care because these awards tie management’s pay to company performance, can increase the number of shares outstanding when they become tradable (dilution), and may signal expected future selling pressure or commitment to long-term growth.

weighted average sale price financial

"The price reported above reflects the weighted average sale price"

401(k) plan financial

"holds 13,344 shares indirectly through the company's 401(k) plan"

A 401(k) plan is a workplace retirement account that lets employees set aside part of their pay into a tax-advantaged savings pot, often with employers adding matching contributions — like a workplace piggy bank for future income. It matters to investors because the amount people save and how employers fund these plans influence consumer spending, corporate payroll costs and the flow of money into financial markets, which can affect stock prices and company valuations.

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What insider transactions did AMSC CEO Daniel McGahn report on this Form 4?

Daniel P. McGahn reported selling 9,670 shares of American Superconductor common stock on June 8, 2026. The transactions were open-market sales at weighted average prices of $41.3891 and $42.1935 per share, linked to tax withholding for restricted stock vesting.

Why did AMSC CEO Daniel McGahn sell 9,670 shares of stock?

The shares were sold to cover tax withholding obligations from the vesting of restricted stock awards. The filing states the transactions were executed under a pre-arranged Rule 10b5-1 trading plan, indicating a structured, compensation-related sale rather than a discretionary trade.

At what prices did Daniel McGahn sell AMSC shares on June 8, 2026?

McGahn sold 4,992 shares at a weighted average price of $41.3891 and 4,678 shares at $42.1935. Footnotes note these were executed in multiple trades within ranges of $40.86–$41.74 and $41.88–$42.86 per share, respectively.

How many AMSC shares does Daniel McGahn hold after these transactions?

After the reported sales, McGahn holds 1,148,046 American Superconductor shares directly. He also holds 13,344 shares indirectly through the company’s 401(k) plan as of June 10, 2026, according to the Form 4 footnotes.

Was the AMSC CEO’s June 2026 stock sale under a Rule 10b5-1 plan?

Yes. The Form 4 states the sales were effected under a Rule 10b5-1 trading plan entered into on August 15, 2025 and modified on February 26, 2026. Such plans schedule trades in advance, reducing the significance of short-term market timing.

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Form 4 Insider Transactions: What Each Field Means →

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Accepted by SEC EDGAR 06/10/2026 - 04:53 PM EDT

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

McGahn Daniel P

(Last)

(First)

(Middle)

C/O AMERICAN SUPERCONDUCTOR CORPORATION

114 EAST MAIN ST

(Street)

AYER

MASSACHUSETTS

01432

(City)

(State)

(Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
AMERICAN SUPERCONDUCTOR CORP /DE/ [ AMSC ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

X	Director	10% Owner
X	Officer (give title below)	Other (specify below)
	Chairman, President and CEO

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
06/08/2026

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

4. If Amendment, Date of Original Filed (Month/Day/Year)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	Code	V	Amount	(A) or (D)	Price		6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
Common Stock	06/08/2026		S⁽¹⁾		4,992	D	$41.3891⁽²⁾	1,152,724	D
Common Stock	06/08/2026		S⁽¹⁾		4,678	D	$42.1935⁽³⁾	1,148,046⁽⁴⁾	D
Common Stock								13,344⁽⁵⁾	I	By 401(k) plan

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares	8. Price of Derivative Security (Instr. 5)		10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)

Explanation of Responses:

1. Represents the number of shares sold by the reporting person to cover tax withholding obligations in connection with the vesting of restricted stock awards. The reported transaction was effected pursuant to a Rule 10b5-1 trading plan previously entered into by the reporting person on August 15, 2025, as modified on February 26, 2026.

2. The sales were executed in multiple trades at prices ranging from $40.86-$41.74. The price reported above reflects the weighted average sale price. The reporting person hereby undertakes to provide, upon request, to the SEC staff, the issuer, or a security holder of the issuer, full information regarding the number of shares and prices at which the transactions were effected.

3. The sales were executed in multiple trades at prices ranging from $41.88-$42.86. The price reported above reflects the weighted average sale price. The reporting person hereby undertakes to provide, upon request, to the SEC staff, the issuer, or a security holder of the issuer, full information regarding the number of shares and prices at which the transactions were effected.

4. Following all the transactions reported on this Form 4, the reporting person holds 1,148,046 shares directly.

5. Following all the transactions reported on this Form 4, the reporting person holds 13,344 shares indirectly through the company's 401(k) plan as of June 10, 2026.

	/s/ Daniel P. McGahn	06/10/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 4: SEC 1474 (03-26)

Source: View Original Filing on SEC EDGAR