Comparable stake leader
Mithril LP
SEC ownership of BlackSky Technology Inc.
Top holders, 13D/G large-stake signals, insider positions, and transaction flow tied to CIK 0001753539.
Disclosed value leader
BlackRock, Inc.
Comparable rows
50/50
Latest evidence
31 Mar 2026
- Public ticker
- BKSY, BKSY-WT on NYSE
- Parsed ownership sources
- 13D/G, 13F, and 3/4/5
- Largest SEC-reported holder
- Mithril LP
- Latest 13D/G holder
- Mithril LP
- Latest parsed ownership date
- 31 Mar 2026
- Issuer CIK
- 0001753539
- Issuer location
- Herndon, VA
Ownership snapshot
CIK-linked ownership evidence from parsed SEC filings.
2 signals
Issuer
Names, identifiers, and filing context for this profile.
2 identity fields
Ownership snapshot
Top shareholders of BlackSky Technology Inc. (13F + 13D/G + 3/4/5)
Grouped by holder across the latest SEC ownership disclosures. Start with comparable ownership when available, then verify the linked 13F, 13D/G, or 3/4/5 evidence.
Comparable stake leader
Mithril LP
Disclosed value leader
BlackRock, Inc.
Comparable rows
50/50
Latest evidence
31 Mar 2026
13D/G
13F
3/4/5
Lead comparable stake: 6.6%
13D/G row: Mithril LP
Showing 1-8 of 50 holder rows.
Quick read
Mithril LP leads the comparable SEC ownership view at 6.6%.
50 of 50 rows have a safely comparable ownership percentage. Use this as a filing-backed starting point, then open the detailed table for source links, reporting role, position value, share count, and filing date.
Open SEC evidence
Opens Mithril LP's linked filing trail.
Comparable ownership
Top 5
Mithril LP
6.6%
BlackRock, Inc.
6.5%
Bank of New York Mellon Corp
5.2%
AWM Investment Company, Inc.
4.8%
Nantahala Capital Management, LLC
4.5%
Ownership % is shown only when SEC disclosures are safely comparable across share classes.
Detailed SEC evidence table Showing 1-8 of 50 holder rows
| Holder | Evidence | Ownership % | Position | 12M Net Δ | As of |
|---|---|---|---|---|---|
| Mithril LP |
13D/G
Ajay Royan
|
6.6%
|
$54,510,255
2,328,503 shares
|
$0 | 07 Aug 2025 |
| BlackRock, Inc. |
13F
13D/G
Company
|
6.5%
from 13D/G
|
$63,945,323
2,541,547 shares
|
— | 31 Mar 2026 |
| Bank of New York Mellon Corp |
13D/G
13F
Company
|
5.2%
|
$48,258,993
1,918,084 shares
|
-$3,886,188 | 31 Mar 2026 |
| AWM Investment Company, Inc. |
13D/G
13F
Company
|
4.8%
|
$44,192,872
1,725,610 shares
|
-$12,403,333 | 31 Dec 2025 |
| Nantahala Capital Management, LLC |
13D/G
|
4.5%
|
$11,663,698
1,377,060 shares
|
-$9,087,802 | 31 Dec 2024 |
| Walleye Capital LLC |
13D/G
|
0.8%
|
$1,952,949
230,572 shares
|
$0 | 30 Sep 2024 |
| William D. Porteous |
3/4/5
Director
|
2.2%
|
$14,956,236
797,666 shares
|
— | 31 Mar 2026 |
| David DiDomenico |
3/4/5
Director
|
0.56%
|
$3,790,764
205,017 shares
|
— | 11 Sep 2025 |
How to read this table
Rows are grouped by holder and ranked first by SEC-reported ownership % when it is safely comparable, then by disclosed holdings value. — indicates unavailable or non-comparable values; "mixed-class rows" means the latest filing spans non-comparable classes.
Forms 3/4/5 flow
Insider trading overview
Net insider flow leans to selling over the last 12 months. Net value: -$3,767,410.
Buys
$0
Insiders: 0
Sells
$3,767,410
Insiders: 4
Net
-$3,767,410
Shares: -211,995
Window
Last 12 months
4 rolling buckets
Buy value
Sell value
Shares: 0
Shares: 211,995
| Window (months) | Buy shares | Sell shares | Buy value | Sell value | Net value |
|---|---|---|---|---|---|
| 0-3 | 0 | 0 | $0 | $0 | $0 |
| 3-6 | 0 | 37,416 | $0 | $721,006 | -$721,006 |
| 6-9 | 0 | 174,579 | $0 | $3,046,404 | -$3,046,404 |
| 9-12 | 0 | 0 | $0 | $0 | $0 |
Reporting owners
Insider holders from Forms 3/4/5
Showing 1-16 of 16 reporting-owner rows connected to BlackSky Technology Inc.. Open a relationship link for the CIK-to-CIK filing trail.
Rows
16
Largest Forms 3/4/5 holder
Brian E. O'Toole
Net 12M change
-$3,767,409
Latest report
31 Mar 2026
| Name | Relationship | Holdings Value | Past Year Net Change | Change % | Valuation | Report Date |
|---|---|---|---|---|---|---|
| Brian E. O'Toole | CEO and President, Director | $26,292,078 | -$1,389,478 | -5% | Mixed | 10 Mar 2026 |
| William D. Porteous | Director | $14,956,236 | Mixed | 31 Mar 2026 | ||
| Henry Edward Dubois | Chief Financial Officer | $11,764,757 | -$1,323,542 | -10% | Mixed | 10 Mar 2026 |
| Mithril GP LP | 10%+ Owner | $11,043,476 | Mixed | 09 Sep 2021 | ||
| Jonathan Z. Cohen | Former Co-Chairman | $10,594,375 | Mixed | 09 Sep 2021 | ||
| Christiana L. Lin | General Counsel & CAO | $10,304,203 | -$1,016,453 | -9% | Mixed | 10 Mar 2026 |
| David DiDomenico | Director | $3,790,764 | Mixed | 11 Sep 2025 | ||
| Brian G. Daum | Chief Financial Officer | $1,908,527 | Mixed | 09 Sep 2021 | ||
| James R. Tolonen | Director | $1,444,518 | Mixed | 31 Mar 2026 | ||
| Susan M. Gordon | Director | $1,433,887 | Mixed | 31 Mar 2026 | ||
| Magid M. Abraham | Director | $1,215,881 | Mixed | 31 Mar 2026 | ||
| Timothy M. Harvey | Director | $1,062,139 | Mixed | 11 Sep 2025 | ||
| Tracy Ward | SVP & Controller | $976,927 | -$37,936 | -3.7% | Mixed | 11 Mar 2026 |
| Johan G. Broekhuysen | Chief Financial Officer | $604,536 | Mixed | 25 Feb 2022 | ||
| JANA PARTNERS LLC | Other* | Mixed | 09 Jun 2023 | |||
| SEAHAWK SPV INVESTMENT LLC | 10%+ Owner | Mixed | 09 Sep 2021 |
Recent insider transactions for BlackSky Technology Inc.
Showing up to 300 recent insider transactions from the last 12 months.
| Insider | Symbol | Class | Transaction | % | SEC-reported value | SEC-reported price | Shares | Shares owned | Date | Ownership |
|---|---|---|---|---|---|---|---|---|---|---|
| Susan M. Gordon | BKSY | Class A Common Stock | Award | 1.18% | 894 | 76,474 | 31 Mar 2026 | Direct | ||
| James R. Tolonen | BKSY | Class A Common Stock | Award | 1.17% | 894 | 77,041 | 31 Mar 2026 | Direct | ||
| William D. Porteous | BKSY | Class A Common Stock | Award | 1.16% | 894 | 77,785 | 31 Mar 2026 | Direct | ||
| Magid M. Abraham | BKSY | Class A Common Stock | Award | 1.4% | 894 | 64,847 | 31 Mar 2026 | Direct | ||
| Brian E. O'Toole | BKSY | Class A Common Stock | Tax liability | -2.53% | -24,999 | 963,522 | 11 Mar 2026 | Direct | ||
| Christiana L. Lin | BKSY | Class A Common Stock | Tax liability | -3.49% | -13,741 | 379,817 | 11 Mar 2026 | Direct | ||
| Henry Edward Dubois | BKSY | Class A Common Stock | Tax liability | -5.08% | -23,551 | 439,822 | 11 Mar 2026 | Direct | ||
| Tracy Ward | BKSY | Class A Common Stock | Tax liability | -1.84% | -803 | 42,923 | 11 Mar 2026 | Direct | ||
| Brian E. O'Toole | BKSY | Class A Common Stock | Award | 19.9% | 191,666 | 1,155,188 | 10 Mar 2026 | Direct | ||
| Christiana L. Lin | BKSY | Class A Common Stock | Award | 19.2% | 72,916 | 452,733 | 10 Mar 2026 | Direct | ||
| Henry Edward Dubois | BKSY | Class A Common Stock | Award | 17.5% | 77,083 | 516,905 | 10 Mar 2026 | Direct | ||
| William D. Porteous | BKSY | Class A Common Stock | Award | 1.59% | 1,200 | 76,891 | 31 Dec 2025 | Direct | ||
| Magid M. Abraham | BKSY | Class A Common Stock | Award | 1.91% | 1,200 | 63,953 | 31 Dec 2025 | Direct | ||
| James R. Tolonen | BKSY | Class A Common Stock | Award | 1.6% | 1,200 | 76,147 | 31 Dec 2025 | Direct | ||
| Susan M. Gordon | BKSY | Class A Common Stock | Award | 1.61% | 1,200 | 75,580 | 31 Dec 2025 | Direct | ||
| Tracy Ward | BKSY | Class A Common Stock | Sale | -1.58% | $13,489 | $19.27 | -700 | 43,726 | 12 Dec 2025 | Direct |
| Christiana L. Lin | BKSY | Class A Common Stock | Sale | -2.57% | $200,177 | $19.27 | -10,388 | 393,558 | 12 Dec 2025 | Direct |
| Henry Edward Dubois | BKSY | Class A Common Stock | Sale | -2.71% | $248,814 | $19.27 | -12,912 | 463,373 | 12 Dec 2025 | Direct |
| Brian E. O'Toole | BKSY | Class A Common Stock | Sale | -1.34% | $258,526 | $19.27 | -13,416 | 988,521 | 12 Dec 2025 | Direct |
| James R. Tolonen | BKSY | Class A Common Stock | Award | 1.01% | 750 | 74,947 | 10 Dec 2025 | Direct | ||
| William D. Porteous | BKSY | Class A Common Stock | Award | 2.02% | 1,500 | 75,691 | 10 Dec 2025 | Direct | ||
| James R. Tolonen | BKSY | Class A Common Stock | Award | 1.53% | 1,116 | 74,197 | 30 Sep 2025 | Direct | ||
| Magid M. Abraham | BKSY | Class A Common Stock | Award | 1.81% | 1,116 | 62,753 | 30 Sep 2025 | Direct | ||
| William D. Porteous | BKSY | Class A Common Stock | Award | 1.53% | 1,116 | 74,191 | 30 Sep 2025 | Direct | ||
| Susan M. Gordon | BKSY | Class A Common Stock | Award | 1.52% | 1,116 | 74,380 | 30 Sep 2025 | Direct | ||
| Brian E. O'Toole | BKSY | Class A Common Stock | Award | 33.2% | 250,000 | 1,001,937 | 15 Sep 2025 | Direct | ||
| Brian E. O'Toole | BKSY | Class A Common Stock | Award | 33.3% | 250,000 | 1,000,164 | 15 Sep 2025 | Direct | ||
| Tracy Ward | BKSY | Class A Common Stock | Sale | -1.51% | $11,883 | $17.45 | -681 | 44,426 | 12 Sep 2025 | Direct |
| Christiana L. Lin | BKSY | Class A Common Stock | Sale | -5.33% | $396,848 | $17.45 | -22,742 | 403,946 | 12 Sep 2025 | Direct |
| Henry Edward Dubois | BKSY | Class A Common Stock | Sale | -5.91% | $522,505 | $17.45 | -29,943 | 476,285 | 12 Sep 2025 | Direct |
| Brian E. O'Toole | BKSY | Class A Common Stock | Sale | -4.02% | $550,007 | $17.45 | -31,519 | 751,937 | 12 Sep 2025 | Direct |
| Timothy M. Harvey | BKSY | Class A Common Stock | Award | 17.7% | 8,625 | 57,444 | 11 Sep 2025 | Direct | ||
| James R. Tolonen | BKSY | Class A Common Stock | Award | 13.4% | 8,625 | 73,081 | 11 Sep 2025 | Direct | ||
| Susan M. Gordon | BKSY | Class A Common Stock | Award | 13.3% | 8,625 | 73,264 | 11 Sep 2025 | Direct | ||
| David DiDomenico | BKSY | Class A Common Stock | Award | 5.24% | 8,625 | 173,290 | 11 Sep 2025 | Direct | ||
| Magid M. Abraham | BKSY | Class A Common Stock | Award | 16.3% | 8,625 | 61,637 | 11 Sep 2025 | Direct | ||
| William D. Porteous | BKSY | Class A Common Stock | Award | 13.4% | 8,625 | 73,075 | 11 Sep 2025 | Direct | ||
| Brian E. O'Toole | BKSY | Class A Common Stock | Sale | -4.25% | $580,945 | $17.45 | -33,292 | 750,164 | 10 Sep 2025 | Direct |
| Henry Edward Dubois | BKSY | Class A Common Stock | Sale | -6.25% | $552,223 | $17.45 | -31,646 | 474,582 | 10 Sep 2025 | Direct |
| Christiana L. Lin | BKSY | Class A Common Stock | Sale | -5.63% | $419,428 | $17.45 | -24,036 | 402,652 | 10 Sep 2025 | Direct |
| Tracy Ward | BKSY | Class A Common Stock | Sale | -1.6% | $12,564 | $17.45 | -720 | 44,387 | 10 Sep 2025 | Direct |
| Susan M. Gordon | BKSY | Class A Common Stock | Award | 1.72% | 1,093 | 64,639 | 30 Jun 2025 | Direct | ||
| William D. Porteous | BKSY | Class A Common Stock | Award | 1.73% | 1,093 | 64,450 | 30 Jun 2025 | Direct | ||
| Magid M. Abraham | BKSY | Class A Common Stock | Award | 2.11% | 1,093 | 53,012 | 30 Jun 2025 | Direct | ||
| James R. Tolonen | BKSY | Class A Common Stock | Award | 1.72% | 1,093 | 64,456 | 30 Jun 2025 | Direct | ||
| Tracy Ward | BKSY | Class A Common Stock | Options Exercise | 6% | 2,554 | 45,107 | 16 Jun 2025 | Direct | ||
| Tracy Ward | BKSY | Class A Common Stock | Tax liability | -1.96% | -683 | 34,146 | 10 Jun 2025 | Direct | ||
| Christiana L. Lin | BKSY | Class A Common Stock | Tax liability | -0.94% | -4,042 | 426,688 | 10 Jun 2025 | Direct | ||
| Henry Edward Dubois | BKSY | Class A Common Stock | Tax liability | -1.55% | -7,839 | 499,321 | 10 Jun 2025 | Direct | ||
| Brian E. O'Toole | BKSY | Class A Common Stock | Tax liability | -0.88% | -6,935 | 783,456 | 10 Jun 2025 | Direct |
* marks a reported price that did not pass the local price check.