[144] Iron Mountain Inc. SEC Filing

Rhea-AI Filing Summary

Solid Power, Inc. (SLDP) – Form 4 insider transaction

Chief Financial Officer, Treasurer and Secretary Linda C. Heller reported a single transaction dated 30 June 2025. The filing shows 25,950 common shares (transaction code F) were withheld at $2.15 per share to satisfy statutory tax withholding obligations arising from the vesting of restricted stock units. No open-market sale or purchase occurred, and there were no derivative security transactions reported.

Following the tax-related share withholding, the executive’s direct ownership stands at 1,856,797 common shares. No indirect holdings or new derivative securities were disclosed.

Because the shares were withheld rather than sold on the open market, the transaction is typically regarded as administrative and neutral with limited market significance. Nevertheless, the filing reaffirms that the CFO continues to hold a sizeable equity position in the company, maintaining an alignment of interests with outside shareholders.

Positive

• CFO retains 1,856,797 common shares after the transaction, indicating continued insider alignment with shareholder interests.

Negative

• None.

Insights

Financial Analyst

TL;DR: Neutral, tax-withholding transaction; CFO still owns ~1.9 m shares.

The Form 4 discloses only a code F tax-withholding event: 25,950 shares were surrendered to cover payroll taxes tied to RSU vesting. No discretionary sale occurred, so market-signal value is low. Post-event holdings of 1,856,797 shares represent a meaningful insider stake, implying continued commitment. From a liquidity standpoint, the share count absorbed by the company is immaterial relative to SLDP’s ~178 m share base. Accordingly, the filing is routine and should not materially affect valuation or trading sentiment.

Form 144 Filer Information	UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 144 NOTICE OF PROPOSED SALE OF SECURITIES PURSUANT TO RULE 144 UNDER THE SECURITIES ACT OF 1933
FORM 144

144: Filer Information

Filer CIK
Filer CCC
Is this a LIVE or TEST Filing?	LIVE TEST
Submission Contact Information
Name
Phone
E-Mail Address

144: Issuer Information

Name of Issuer

SEC File Number

Address of Issuer

Phone

Name of Person for Whose Account the Securities are To Be Sold

See the definition of "person" in paragraph (a) of Rule 144. Information is to be given not only as to the person for whose account the securities are to be sold but also as to all other persons included in that definition. In addition, information shall be given as to sales by all persons whose sales are required by paragraph (e) of Rule 144 to be aggregated with sales for the account of the person filing this notice.

Relationship to Issuer

144: Securities Information

Title of the Class of Securities To Be Sold	Name and Address of the Broker	Number of Shares or Other Units To Be Sold	Aggregate Market Value	Number of Shares or Other Units Outstanding	Approximate Date of Sale	Name the Securities Exchange
Common	Fidelity Brokerage Services LLC 900 Salem Street Smithfield RI 02917	17334	1733466.02	295043896	07/01/2025	NYSE

Furnish the following information with respect to the acquisition of the securities to be sold and with respect to the payment of all or any part of the purchase price or other consideration therefor:

144: Securities To Be Sold

Title of the Class	Date you Acquired	Nature of Acquisition Transaction	Name of Person from Whom Acquired	Is this a Gift?	Date Donor Acquired	Amount of Securities Acquired	Date of Payment	Nature of Payment *
Common	03/01/2025	Restricted Stock Vesting	Issuer			17334	03/01/2025	Compensation

* If the securities were purchased and full payment therefor was not made in cash at the time of purchase, explain in the table or in a note thereto the nature of the consideration given. If the consideration consisted of any note or other obligation, or if payment was made in installments describe the arrangement and state when the note or other obligation was discharged in full or the last installment paid.

Furnish the following information as to all securities of the issuer sold during the past 3 months by the person for whose account the securities are to be sold.

144: Securities Sold During The Past 3 Months

Nothing to Report

144: Remarks and Signature

Remarks

Date of Notice

Date of Plan Adoption or Giving of Instruction, If Relying on Rule 10b5-1

ATTENTION:

The person for whose account the securities to which this notice relates are to be sold hereby represents by signing this notice that he does not know any material adverse information in regard to the current and prospective operations of the Issuer of the securities to be sold which has not been publicly disclosed. If such person has adopted a written trading plan or given trading instructions to satisfy Rule 10b5-1 under the Exchange Act, by signing the form and indicating the date that the plan was adopted or the instruction given, that person makes such representation as of the plan adoption or instruction date.

Signature

ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)

FAQ

How many Solid Power (SLDP) shares did the CFO dispose of on 30 June 2025?

25,950 shares were withheld to cover taxes upon RSU vesting.

Was the insider transaction an open-market sale?

No. The code F designation indicates shares were withheld for tax purposes, not sold on the open market.

What is Linda C. Heller’s share ownership in SLDP after the filing?

She directly owns 1,856,797 common shares following the transaction.

Were any derivative securities (options or warrants) reported in this Form 4?

No derivative security acquisitions or disposals were reported.

Does this Form 4 signal a change in insider sentiment?

Likely not; withholding shares for taxes is administrative and generally neutral in sentiment.