BlackSky officer plans $318K stock sale

Officer Henry Dubois filed a Rule 144 notice to sell up to 15,284 BlackSky Class A shares, primarily to cover tax liabilities from RSU vesting.

Rhea-AI Filing Summary

BlackSky Technology Inc. (BKSY) is the issuer for a planned resale by officer Henry Dubois under Rule 144. The notice covers up to 15,284 shares of Class A Common Stock, with an aggregate market value of $317,743, to be sold through Morgan Stanley on or about September 11, 2026 on the NYSE. The shares relate to RSUs vesting on September 10, 2026 and are subject to an issuer-implemented, non-discretionary sell-to-cover arrangement to satisfy income tax liabilities, unless Dubois pays the taxes in cash. Dubois also reported prior sales of 14,749 shares on June 10, 2026 and 4,000 shares on August 28, 2026.

Key Figures

Shares to be sold: 15,284 shares Aggregate market value of planned sale: $317,743 Shares outstanding (class referenced): 482,872 shares +4 more

7 metrics

Shares to be sold 15,284 shares Class A Common Stock covered by the Rule 144 notice

Aggregate market value of planned sale $317,743 Value associated with 15,284 shares in the Rule 144 notice

Shares outstanding (class referenced) 482,872 shares Number of Class A Common Stock shares outstanding stated in the notice

RSUs vesting 32,185 units Restricted Share Units vesting on September 10, 2026

Sale on June 10, 2026 14,749 shares for $502,941 Class A Common Stock sold during the past 3 months

Sale on August 28, 2026 4,000 shares for $95,120 Class A Common Stock sold during the past 3 months

Approximate sale date September 11, 2026 Approximate date of sale for the planned Rule 144 transaction

Key Terms

Rule 144, Restricted Share Units, sell-to-cover, Equity Compensation

4 terms

Rule 144 regulatory

"See the definition of "person" in paragraph (a) of Rule 144."

Rule 144 is a U.S. securities regulation that sets conditions under which restricted or insider-held shares can be legally resold to the public, such as required holding periods, availability of public information, limits on how much can be sold at once, and certain filing requirements. For investors it matters because it determines when previously locked-up shares can enter the market — like a release valve that can increase supply, affect share price, and signal insider intent.

Restricted Share Units financial

"Restricted Share Units Vesting - See Remarks."

Restricted share units (RSUs) are a promise from a company to give an employee or service provider actual shares or cash equal to the shares after certain conditions are met, typically staying with the company for a set time or hitting performance targets. Think of them like a time-locked gift card that becomes usable only after you’ve earned it. For investors, RSUs matter because they align employee incentives with company performance and can increase the number of shares outstanding over time, diluting existing ownership and affecting earnings per share.

sell-to-cover financial

"non-discretionary sell-to-cover arrangement for the purposes of satisfying income tax"

Sell-to-cover is when part of newly issued or exercised company stock is immediately sold to pay required taxes and fees, so the recipient keeps the remaining shares. For investors this matters because it reduces the number of shares insiders or employees actually hold after a grant, can create small, routine share sales that aren’t signal of cashing out, and slightly increases share supply on the market—like selling a portion of a paycheck to cover the tax bill.

Equity Compensation financial

"09/11/2026 | Equity Compensation"

Equity compensation is pay given to employees, executives or contractors in the form of company ownership—such as stock, stock options or restricted shares—rather than just cash. It matters to investors because it can align workers' incentives with shareholders (like paying someone in slices of the same pie they help grow), but it also increases the number of shares outstanding and company expenses, affecting ownership percentages and earnings per share.

FAQ

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

What does the Form 144 filing for BKSY disclose about Henry Dubois’s planned sale?

It discloses that officer Henry Dubois may sell up to 15,284 shares of BlackSky Class A Common Stock, with an aggregate market value of $317,743, through Morgan Stanley on or about September 11, 2026 under Rule 144.

How are the BlackSky (BKSY) shares being sold by Henry Dubois expected to be used?

The shares are being sold under an issuer-implemented, non-discretionary sell-to-cover arrangement to satisfy income tax liabilities incurred upon vesting of restricted share unit awards, unless Henry Dubois elects to pay those tax liabilities in cash.

What securities are covered in Henry Dubois’s Form 144 related to BKSY?

The filing covers Class A Common Stock of BlackSky Technology Inc., acquired from the issuer as equity compensation when 32,185 RSUs vested on September 10, 2026, with planned sales of up to 15,284 shares on or about September 11, 2026.

What prior BlackSky (BKSY) stock sales by Henry Dubois are disclosed in the last three months?

The notice lists two prior sales of Class A Common Stock: 14,749 shares on June 10, 2026 for an aggregate price of $502,941, and 4,000 shares on August 28, 2026 for an aggregate price of $95,120.

On which exchange and through which broker are Henry Dubois’s BKSY shares expected to be sold?

The planned sales are to be executed on the NYSE through Morgan Stanley Smith Barney LLC Executive Financial Services, located at 1 New York Plaza, 8th Floor, New York, NY 10004, as stated in the notice.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Available on EDGAR 09/10/2026 - 08:30 PM Accepted by SEC EDGAR 09/10/2026 - 08:29 PM Learn about SEC filing dates

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	0001349983
Filer CCC	XXXXXXXX
Is this a LIVE or TEST Filing?	LIVE TEST
Submission Contact Information
Name
Phone
E-Mail Address

144: Issuer Information

Name of Issuer	BlackSky Technology Inc
SEC File Number	001-39113
Address of Issuer	2411 Dulles Corner Park Suite 300 Herndon VIRGINIA 20171
Phone	703-935-1930
Name of Person for Whose Account the Securities are To Be Sold	Henry Dubois
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	Officer

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
Class A Common Stock	Morgan Stanley Smith Barney LLC Executive Financial Services 1 New York Plaza, 8th Floor New York NY 10004	15284	317743	482872	09/11/2026	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 *
Class A Common Stock	09/10/2026	Restricted Share Units Vesting - See Remarks.	Issuer			32185	09/11/2026	Equity 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

Name and Address of Seller	Title of Securities Sold	Date of Sale	Amount of Securities Sold	Gross Proceeds
Henry Dubois 2411 Dulles Corner Park Suite 300 Herndon VA 20171	Class A Common Stock	06/10/2026	14749	502941
Henry Dubois 2411 Dulles Corner Park Suite 300 Herndon VA 20171	Class A Common Stock	08/28/2026	4000	95120

144: Remarks and Signature

Remarks	The reporting person sold the securities reported herein pursuant to an Issuer-implemented, non-discretionary sell-to-cover arrangement for the purposes of satisfying income tax liabilities incurred upon vesting of restricted share unit awards only, unless the reporting person elects to pay such tax liabilities in cash.
Date of Notice	09/10/2026
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	/s/ Henry Dubois
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)