AMSC (AMSC) CEO McGahn sells 16,117 shares to cover taxes under 10b5-1 plan

Rhea-AI Filing Summary

American Superconductor (AMSC) chairman, president and CEO Daniel P. McGahn sold shares in a planned, tax-related transaction. On June 11, 2026, he sold a total of 16,117 shares of common stock in open-market trades to cover tax withholding obligations tied to vesting restricted stock awards.

The sales were executed at weighted average prices of $37.2825 and $37.8511 per share under a previously established Rule 10b5-1 trading plan adopted on August 15, 2025 and modified on February 26, 2026. After these transactions, he holds 1,131,929 shares directly and 13,344 shares indirectly through the company’s 401(k) plan as of June 11, 2026.

Insights

Insider trading & governance analyst

CEO’s sales are pre-planned and primarily for taxes, limiting signal value.

CEO Daniel P. McGahn sold 16,117 shares of American Superconductor common stock on June 11, 2026 at weighted average prices of $37.2825 and $37.8511. The filing states these sales were made to satisfy tax withholding from vesting restricted stock awards.

The footnotes also disclose that the trades were effected under a Rule 10b5-1 plan adopted on August 15, 2025 and modified on February 26, 2026, indicating they were pre-scheduled rather than opportunistic. Following the sales, McGahn still holds 1,131,929 shares directly and 13,344 shares indirectly via the 401(k) plan, so the disposals represent a small portion of his overall position.

This pattern—sales to cover taxes on equity compensation under a trading plan—is typically viewed as routine. The filing does not include derivative exercises or large ownership changes, so the immediate informational impact for investors is limited.

Insider Trade Summary 10b5-1

Net Seller: 16,117 shares ($603,503)

Net Sell 3 txns

Insider McGahn Daniel P

Role Chairman, President and CEO

Sold 16,117 shs ($604K)

Type	Security	Shares	Price	Value
Sale	Common Stock	11,508	$37.2825	$429K
Sale	Common Stock	4,609	$37.8511	$174K
holding	Common Stock	--	--	--

Holdings After Transaction: Common Stock — 1,136,538 shares (Direct, null); Common Stock — 13,344 shares (Indirect, By 401(k) plan)

Footnotes (1)

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. The sales were executed in multiple trades at prices ranging from $36.72-$37.63. 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. The sales were executed in multiple trades at prices ranging from $37.72-$38.06. 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. Following all the transactions reported on this Form 4, the reporting person holds 1,131,929 shares directly. 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 11, 2026.

Key Figures

Shares sold: 16,117 shares Weighted average sale price 1: $37.2825 per share Weighted average sale price 2: $37.8511 per share +4 more

7 metrics

Shares sold 16,117 shares Common stock sold on June 11, 2026

Weighted average sale price 1 $37.2825 per share First open-market sale tranche

Weighted average sale price 2 $37.8511 per share Second open-market sale tranche

Direct holdings after sale 1,131,929 shares Direct ownership following all reported transactions

Indirect 401(k) holdings 13,344 shares Indirect ownership via 401(k) as of June 11, 2026

10b5-1 plan adoption date August 15, 2025 Initial adoption of trading plan

10b5-1 plan modification date February 26, 2026 Subsequent modification of trading plan

Key Terms

Rule 10b5-1 trading plan, restricted stock awards, tax withholding obligations, weighted average sale price, +1 more

5 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

"to 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.

tax withholding obligations financial

"shares sold by the reporting person to cover tax withholding obligations in connection with the vesting..."

weighted average sale price financial

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

401(k) plan financial

"the reporting person holds 13,344 shares indirectly through the company's 401(k) plan as of June 11, 2026."

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.

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Form 4 Insider Transactions: What Each Field Means →

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).

X

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)
06/11/2026

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)
			Code	V	Amount	(A) or (D)	Price
Common Stock	06/11/2026		S(1)		11,508	D	$37.2825(2)	1,136,538	D
Common Stock	06/11/2026		S(1)		4,609	D	$37.8511(3)	1,131,929(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)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

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 $36.72-$37.63. 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 $37.72-$38.06. 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 1,131,929 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 11, 2026.

	/s/ Daniel P. McGahn	06/11/2026
	** 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)

FAQ

What did AMSC CEO Daniel McGahn report in this Form 4 filing?

Daniel McGahn reported selling 16,117 shares of American Superconductor (AMSC) common stock. The sales occurred on June 11, 2026, and were executed in open-market transactions primarily to cover tax withholding obligations tied to vesting restricted stock awards.

At what prices did AMSC’s CEO sell his shares on June 11, 2026?

Daniel McGahn sold shares at weighted average prices of $37.2825 and $37.8511 per share. Footnotes explain the trades occurred in multiple transactions within price ranges of $36.72–$37.63 and $37.72–$38.06, reflecting normal market executions.

Why were Daniel McGahn’s AMSC share sales characterized as tax-related?

The filing states the 16,117 shares were sold to cover tax withholding obligations from vesting restricted stock awards. This means shares were disposed of to pay required taxes on equity compensation, a common, largely mechanical aspect of executive pay structures.

Were the AMSC CEO’s share sales made under a Rule 10b5-1 plan?

Yes. The Form 4 notes the sales were executed under a Rule 10b5-1 trading plan adopted on August 15, 2025 and modified on February 26, 2026. Such pre-arranged plans are designed to schedule trades independently of day-to-day market conditions.

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

After the reported transactions, Daniel McGahn holds 1,131,929 shares directly and 13,344 shares indirectly through the company’s 401(k) plan as of June 11, 2026. This indicates the sales were relatively small compared to his remaining stake.

Does this AMSC Form 4 indicate any derivative exercises by the CEO?

No. The insider data show only non-derivative common stock sales plus a 401(k) holding entry. Derivative-related fields such as exercise price and expiration date are empty, and the derivativeSummary section lists no remaining derivative positions in this specific filing.