SEC ownership of System1, Inc.

Top holders, 13D/G large-stake signals, insider positions, and transaction flow tied to CIK 0001805833.

Comparable stake leader

Blend Family Foundation

Disclosed value leader

William P. Foley II

Comparable rows

11/49

Latest evidence

29 May 2026

Top shareholders Insider holders Latest transactions
Public ticker
SST on NYSE, SSTPW on OTC
Parsed ownership sources
13D/G, 3/4/5, and 13F
Source: Parsed SEC ownership filingsUse: Compare filing families carefully
Largest SEC-reported holder
Blend Family Foundation
Ranking: Comparable ownership first, then disclosed value
Ownership snapshot CIK-linked ownership evidence from parsed SEC filings. 3 signals
Comparable ownership rows
11 of 49
Meaning: Rows with safely comparable ownership %
Latest 13D/G holder
Blend Family Foundation
Source: Latest parsed Schedule 13D/G stake
Latest parsed ownership date
29 May 2026
Freshness: Most recent filing date in this holder set
Issuer Names, identifiers, and filing context for this profile. 2 identity fields
Issuer CIK
0001805833
Issuer location
Marina Del Rey, CA

Ownership snapshot

Top shareholders of System1, 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
Blend Family Foundation
Disclosed value leader
William P. Foley II
Comparable rows
11/49
Latest evidence
29 May 2026
13D/G 3/4/5 13F Lead comparable stake: 7% 38 rows are not safely comparable across share classes. 13D/G row: Blend Family Foundation Showing 1-8 of 49 holder rows.

Quick read

Blend Family Foundation leads the comparable SEC ownership view at 7%.

11 of 49 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 Blend Family Foundation's linked filing trail.
Comparable ownership Top 5
Blend Family Foundation 7%
William P. Foley II 4.8%
Cannae Holdings, Inc. 4.4%
Charles Ursini 4.5%
John Civantos 0.87%

Ownership % is shown only when SEC disclosures are safely comparable across share classes.

Detailed SEC evidence table Showing 1-8 of 49 holder rows
Holder Evidence Ownership % Position 12M Net Δ As of
Blend Family Foundation
13D/G
The Blend Family Foundation
13D/G
7%
$2,107,129
5,545,077 shares
 $0 02 May 2025
William P. Foley II
3/4/5 13D/G
Director, 10%+ Owner
3/4/5 13D/G
4.8%
from 13D/G
$133,445,586
6,625,898 shares
 — 10 May 2022
Cannae Holdings, Inc.
3/4/5 13D/G 13F
10%+ Owner · Company
3/4/5 13D/G 13F
4.4%
from 13D/G
$44,030,854
27,012,794 shares
 — 06 Sep 2023
Charles Ursini
3/4/5
President & COO, Director
3/4/5
4.5%
$132,300
367,500 shares
 — 29 Jul 2025
John Civantos
3/4/5
Director
3/4/5
0.87%
$25,420
70,613 shares
 — 31 Jul 2025
Frank R. Martire
3/4/5
Director
3/4/5
0.51%
$14,967
41,575 shares
 — 31 Jul 2025
Moujan Kazerani
3/4/5
Director
3/4/5
0.5%
$14,505
40,292 shares
 — 31 Jul 2025
Ryan R. Caswell
3/4/5
Director
3/4/5
0.47%
$13,887
38,577 shares
 — 31 Jul 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 buying over the last 12 months. Net value: +$368,343.

Buys
$368,343
Insiders: 2
Sells
$0
Insiders: 0
Net
+$368,343
Shares: +69,660
Window
Last 12 months
4 rolling buckets
Buy value Sell value
Shares: 69,660 Shares: 0
Window (months) Buy shares Sell shares Buy value Sell value Net value
0-3 26,910 0 $80,730 $0 +$80,730
3-6 0 0 $0 $0 $0
6-9 0 0 $0 $0 $0
9-12 42,750 0 $287,613 $0 +$287,613

Reporting owners

Insider holders from Forms 3/4/5

Showing 1-20 of 26 reporting-owner rows connected to System1, Inc.. Open a relationship link for the CIK-to-CIK filing trail.

Rows
26
Largest Forms 3/4/5 holder
William P. Foley II
Net 12M change
+$368,343
Latest report
29 May 2026
Name Relationship Holdings Value Past Year Net Change Change % Valuation Report Date
William P. Foley II Director, 10%+ Owner $133,445,586 Mixed 10 May 2022
BGPT Trebia LP Director, 10%+ Owner $89,640,703 Mixed 19 Apr 2022
Just Develop It Ltd 10%+ Owner $47,882,063 Mixed 28 Jan 2022
Cannae Holdings, Inc. 10%+ Owner $44,030,854 Mixed 06 Sep 2023
Stanley Blend 10%+ Owner $7,323,858 Mixed 24 Dec 2024
CEE Holdings Trust 10%+ Owner $6,731,142 +$287,613 +4.5% Filing P/S 22 Aug 2025
Lone Star Friends Trust 10%+ Owner $2,775,323 Filing P/S 17 Jun 2024
Paul Filsinger President $748,820 Mixed 14 Oct 2022
Tridivesh Kidambi Chief Financial Officer $549,081 +$80,730 +17% Median 29 May 2026
Jennifer Mindy Prince Director $367,014 Mixed 11 Jun 2024
William Dexter Fowler Director $360,414 Mixed 11 Jun 2024
Daniel J. Weinrot General Counsel & Secretary $284,498 Mixed 15 Apr 2026
Brian Coppola Chief Ad Operations Officer $271,499 Mixed 15 Apr 2026
Christopher Stephen Phillips Director, 10%+ Owner $260,800 Mixed 31 Jul 2023
Elizabeth Sestanovich Chief People Officer $242,865 Mixed 15 Apr 2026
Jennifer Lynn Robinson Chief Technology Officer $174,898 Mixed 15 Aug 2024
Charles Ursini President & COO, Director $132,300 Mixed 29 Jul 2025
John Civantos Director $25,420 Mixed 31 Jul 2025
Frank R. Martire Director $14,967 Mixed 31 Jul 2025
Moujan Kazerani Director $14,505 Mixed 31 Jul 2025

Recent insider transactions for System1, 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
Tridivesh Kidambi SST Class A Common Stock Award 24.1% 35,300 181,815 29 May 2026 Direct
Tridivesh Kidambi SST Class A Common Stock Tax liability -0.21% -301 146,515 15 Apr 2026 Direct
Tridivesh Kidambi SST Class A Common Stock Purchase 22.4% $80,730 $3.00 26,910 146,816 15 Apr 2026 Direct
Elizabeth Sestanovich SST Class A Common Stock Tax liability -0.58% -341 58,948 15 Apr 2026 Direct
Brian Coppola SST Class A Common Stock Tax liability -0.5% -331 65,898 15 Apr 2026 Direct
Daniel J. Weinrot SST Class A Common Stock Tax liability -0.49% -341 69,053 15 Apr 2026 Direct
Tridivesh Kidambi SST Class A Common Stock Tax liability -0.21% -258 119,906 28 Jan 2026 Direct
Elizabeth Sestanovich SST Class A Common Stock Tax liability -0.35% -211 59,289 28 Jan 2026 Direct
Brian Coppola SST Class A Common Stock Tax liability -0.35% -231 66,229 28 Jan 2026 Direct
Daniel J. Weinrot SST Class A Common Stock Tax liability -0.3% -211 69,394 28 Jan 2026 Direct
Tridivesh Kidambi SST Class A Common Stock Tax liability -0.29% -345 120,164 15 Jan 2026 Direct
Elizabeth Sestanovich SST Class A Common Stock Tax liability -0.63% -377 59,500 15 Jan 2026 Direct
Brian Coppola SST Class A Common Stock Tax liability -0.56% -371 66,460 15 Jan 2026 Direct
Daniel J. Weinrot SST Class A Common Stock Tax liability -0.54% -377 69,605 15 Jan 2026 Direct
Tridivesh Kidambi SST Class A Common Stock Tax liability -0.22% -263 120,509 28 Oct 2025 Direct
Elizabeth Sestanovich SST Class A Common Stock Tax liability -0.26% -158 59,877 28 Oct 2025 Direct
Brian Coppola SST Class A Common Stock Tax liability -0.35% -235 66,831 28 Oct 2025 Direct
Daniel J. Weinrot SST Class A Common Stock Tax liability -0.3% -214 69,982 28 Oct 2025 Direct
Brian Coppola SST Class A Common Stock Tax liability -0.56% -377 67,066 15 Oct 2025 Direct
Tridivesh Kidambi SST Class A Common Stock Tax liability -0.29% -352 120,772 15 Oct 2025 Direct
Elizabeth Sestanovich SST Class A Common Stock Tax liability -0.47% -282 60,035 15 Oct 2025 Direct
Daniel J. Weinrot SST Class A Common Stock Tax liability -0.54% -382 70,196 15 Oct 2025 Direct
CEE Holdings Trust SST Class A Common Stock Purchase 1.21% $80,630 $7.32 11,015 919,555 22 Aug 2025 Direct
CEE Holdings Trust SST Class A Common Stock Purchase 1.4% $86,830 $6.90 12,584 908,540 21 Aug 2025 Direct
CEE Holdings Trust SST Class A Common Stock Purchase 1.42% $78,650 $6.25 12,584 895,956 20 Aug 2025 Direct
CEE Holdings Trust SST Class A Common Stock Purchase 0.75% $41,503 $6.32 6,567 883,372 19 Aug 2025 Direct
Frank Martire Jr. SST Class A Common Stock Award 56.4% 15,000 41,575 31 Jul 2025 Direct
Ryan R. Caswell SST Class A Common Stock Award 63.6% 15,000 38,577 31 Jul 2025 Direct
Tanmay Kumar SST Class A Common Stock Award 74.3% 15,000 35,196 31 Jul 2025 Direct
Taryn Jogi Naidu SST Class A Common Stock Award 63.7% 15,000 38,562 31 Jul 2025 Direct
Moujan Kazerani SST Class A Common Stock Award 59.3% 15,000 40,292 31 Jul 2025 Direct
John Civantos SST Class A Common Stock Award 27% 15,000 70,613 31 Jul 2025 Direct
Caroline Horn SST Class A Common Stock Award 66.9% 15,000 37,418 31 Jul 2025 Direct
Charles Ursini SST Class A Common Stock Award 1125% 337,500 367,500 29 Jul 2025 Direct
Tridivesh Kidambi SST Class A Common Stock Award 70.3% 50,000 121,124 29 Jul 2025 Direct
Tridivesh Kidambi SST Stock Appreciation Rights Award 38.5% 20,000 72,000 29 Jul 2025 Direct
Brian Coppola SST Class A Common Stock Award 145.8% 40,000 67,443 29 Jul 2025 Direct
Elizabeth Sestanovich SST Class A Common Stock Award 196.9% 40,000 60,317 29 Jul 2025 Direct
Daniel J. Weinrot SST Class A Common Stock Award 290.4% 52,500 70,578 29 Jul 2025 Direct
Tridivesh Kidambi SST Class A Common Stock Tax liability -0.31% -224 71,124 28 Jul 2025 Direct
Brian Coppola SST Class A Common Stock Tax liability -0.75% -206 27,443 28 Jul 2025 Direct
Elizabeth Sestanovich SST Class A Common Stock Tax liability -0.66% -135 20,317 28 Jul 2025 Direct
Daniel J. Weinrot SST Class A Common Stock Tax liability -1.05% -191 18,078 28 Jul 2025 Direct
Tridivesh Kidambi SST Class A Common Stock Tax liability -0.42% -300 71,348 15 Jul 2025 Direct
Brian Coppola SST Class A Common Stock Tax liability -1.18% -330 27,649 15 Jul 2025 Direct
Elizabeth Sestanovich SST Class A Common Stock Tax liability -1.16% -240 20,452 15 Jul 2025 Direct
Daniel J. Weinrot SST Class A Common Stock Tax liability -1.83% -341 18,269 15 Jul 2025 Direct
* marks a reported price that did not pass the local price check.
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