William D. Porteous - 11 Sep 2026 Form 4 Insider Report for BlackSky Technology Inc. (BKSY)

Reporting relationship: Director
Issuer ticker: BKSY
Reported as of: 11 Sep 2026
Net transaction value: $0
SEC form: 4
Accepted by SEC: 14 Sep 2026, 16:38:09 UTC
Prior SEC filing: 30 Jun 2026
Source filing: View source filing
Reporting owner signature: /s/ Christiana L. Lin, attorney-in-fact on behalf of William D. Porteous

Key filing fact

William D. Porteous filed Form 4 for BlackSky Technology Inc. (BKSY) on 14 Sep 2026.

Key facts

This page summarizes William D. Porteous's Form 4 filing for BlackSky Technology Inc. (BKSY).
1 reported transaction and 0 derivative rows are listed below.
Accepted by SEC: 14 Sep 2026, 16:38.

Change

Previous filing in this sequence was filed on 30 Jun 2026.
Current net transaction value: $0.

Research use

This tells you what this filing adds before you inspect full transaction and derivative tables.
You can trace every row back to the original SEC filing document.

Evidence

Filed on Form 4

Ownership activity is grounded in SEC Form 4 disclosures.

View source filing

Reporting Owners (1)

CIK 0001865965 Primary reporting owner

Porteous William D.

Relationship: Director
Address: C/O BLACKSKY TECHNOLOGY INC.,, 2411 DULLES CORNER PARK, SUITE 300, HERNDON
Signature: /s/ Christiana L. Lin, attorney-in-fact on behalf of William D. Porteous
Signature date: 15 Sep 2026

Reported non-derivative transactions

Shares, units, or other non-derivative securities reported in this filing.

BKSY transaction

Class A Common Stock

Award

Transaction value
Shares: +8,733
Change %: +11%
Price: $0.000000^*
Shares after: 87,323
Date: 11 Sep 2026
Ownership: Direct
Footnotes: F1

BKSY holding

Class A Common Stock

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after: 719,881
Date: 11 Sep 2026
Ownership: See footnote
Footnotes: F2

^* marks a reported price that did not pass the local price check.

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 2 footnotes

Footnote F1

These securities are restricted stock units (RSUs). Each RSU represents a contingent right to receive one share of the Issuer's Class A Common Stock. The RSUs are awarded in connection with the Company's Outside Director Compensation Policy and will vest in full upon the earlier of the one-year anniversary of the award date or the date of the Issuer's next annual meeting of the stockholders, in each case subject to the Reporting Person's continued service on the Issuer's board of directors through the applicable vesting date.

Footnote F2

These shares are held by RRE Ventures IV, L.P. ("Ventures IV"). The general partner of Ventures IV is RRE Ventures GP VI, LLC ("GP VI"). The managing members and officers of GP VI are James D. Robinson IV, Stuart J. Ellman, and William D. Porteous. Each of GP VI and Messrs. Robinson IV, Ellman, and Porteous disclaim beneficial ownership of the securities reported on this Form 4, except to the extent of its or his pecuniary interest therein, if any.