Comparable stake leader
FMR LLC
SEC ownership of Roblox Corp
Top holders, 13D/G large-stake signals, insider positions, and transaction flow tied to CIK 0001315098.
Disclosed value leader
David Baszucki
Comparable rows
50/50
Latest evidence
24 Aug 2026
- Public ticker
- RBLX on NYSE
- Parsed ownership sources
-
13D/G, 13F, and 3/4/5
Source: Parsed SEC ownership filingsUse: Compare filing families carefully
- Largest SEC-reported holder
-
FMR LLC
Ranking: Comparable ownership first, then disclosed value
- Comparable ownership rows
-
50 of 50
Meaning: Rows with safely comparable ownership %
- Latest 13D/G holder
-
FMR LLC
Source: Latest parsed Schedule 13D/G stake
- Latest parsed ownership date
-
24 Aug 2026
Freshness: Most recent filing date in this holder set
- Issuer CIK
- 0001315098
- Issuer location
- San Mateo, CA
Ownership snapshot
CIK-linked ownership evidence from parsed SEC filings.
3 signals
Issuer
Names, identifiers, and filing context for this profile.
2 identity fields
Ownership snapshot
Top shareholders of Roblox Corp (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
FMR LLC
Disclosed value leader
David Baszucki
Comparable rows
50/50
Latest evidence
24 Aug 2026
13D/G
13F
3/4/5
Lead comparable stake: 12%
13D/G row: FMR LLC
Showing 1-8 of 50 holder rows.
Quick read
FMR LLC leads the comparable SEC ownership view at 12%.
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 FMR LLC's linked filing trail.
Comparable ownership
Top 5
FMR LLC
12%
VANGUARD GROUP INC
9.3%
David Baszucki
7%
BlackRock, Inc.
5.5%
Altos Ventures IV, L.P.
3.7%
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 |
|---|---|---|---|---|---|
| FMR LLC |
13D/G
13F
Company
|
12%
|
$4,335,383,477
79,723,713 shares
|
+$1,645,769,787 | 30 Jun 2026 |
| VANGUARD GROUP INC |
13D/G
The Vanguard Group
|
9.3%
|
$3,837,692,306
57,640,317 shares
|
$0 | 31 Mar 2025 |
| David Baszucki |
13D/G
3/4/5
President & CEO, Director, 10%+ Owner
|
7%
|
$5,110,111,289
48,349,998 shares
|
$0 | 30 Jun 2025 |
| BlackRock, Inc. |
13D/G
13F
Company
|
5.5%
|
$4,916,697,447
35,494,495 shares
|
$0 | 30 Sep 2025 |
| Altos Ventures IV, L.P. |
13D/G
3/4/5
Anthony P. Lee · 10%+ Owner
|
3.7%
|
$1,492,469,997
22,416,191 shares
|
$0 | 31 Dec 2024 |
| Christopher Carvalho |
3/4/5
Director
|
0.17%
|
$65,217,412
1,153,066 shares
|
— | 28 May 2026 |
| Anthony P. Lee |
3/4/5
Director
|
0.05%
|
$16,964,003
311,953 shares
|
-$35,370,283 | 10 Aug 2026 |
| Arvind Chakravarthy |
3/4/5
Chief People & Systems Officer
|
0.03%
|
$18,932,433
219,157 shares
mixed-class rows
|
-$9,950,587 | 20 Feb 2026 |
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: -$123,424,919.
Buys
$0
Insiders: 0
Sells
$123,424,919
Insiders: 10
Net
-$123,424,919
Shares: -1,612,485
Window
Last 12 months
4 rolling buckets
Buy value
Sell value
Shares: 0
Shares: 1,612,485
| Window (months) | Buy shares | Sell shares | Buy value | Sell value | Net value |
|---|---|---|---|---|---|
| 0-3 | 0 | 184,642 | $0 | $7,599,777 | -$7,599,777 |
| 3-6 | 0 | 200,137 | $0 | $10,079,891 | -$10,079,891 |
| 6-9 | 0 | 839,198 | $0 | $62,107,360 | -$62,107,360 |
| 9-12 | 0 | 388,508 | $0 | $43,637,891 | -$43,637,891 |
Reporting owners
Insider holders from Forms 3/4/5
Showing 1-20 of 29 reporting-owner rows connected to Roblox Corp. Open a relationship link for the CIK-to-CIK filing trail.
Rows
29
Largest Forms 3/4/5 holder
David Baszucki
Net 12M change
-$123,424,919
Latest report
24 Aug 2026
| Name | Relationship | Holdings Value | Past Year Net Change | Change % | Valuation | Report Date |
|---|---|---|---|---|---|---|
| David Baszucki | President & CEO, Director, 10%+ Owner | $1,913,047,048 | -$43,523,612 | -2.2% | Mixed | 20 Aug 2026 |
| Index Ventures Growth III (Jersey), L.P. | 10%+ Owner | $1,898,930,825 | Mixed | 10 Mar 2021 | ||
| Altos Ventures IV Reserve Fund, L.P. | 10%+ Owner | $667,582,842 | Mixed | 19 Nov 2021 | ||
| Hodong Nam | 10%+ Owner | $154,809,718 | Mixed | 24 Apr 2024 | ||
| Altos Ventures IV Liquidity Fund, L.P. | 10%+ Owner | $126,754,629 | Mixed | 17 Jul 2023 | ||
| Han Kim | 10%+ Owner | $126,729,976 | Mixed | 27 Nov 2023 | ||
| Gregory Baszucki | Director | $69,247,001 | -$5,227,809 | -7% | Median | 20 Aug 2026 |
| Christopher Carvalho | Director | $65,217,412 | Mixed | 28 May 2026 | ||
| Manuel Bronstein | Chief Product Officer | $64,527,418 | Mixed | 20 Aug 2025 | ||
| Michael J. Guthrie | Chief Financial Officer | $56,889,225 | Mixed | 05 Jun 2025 | ||
| Craig Donato | Chief Business Officer | $48,889,695 | Mixed | 24 May 2023 | ||
| Altos Hybrid 2, L.P. | 10%+ Owner | $28,383,730 | Mixed | 24 Nov 2021 | ||
| Mark Reinstra | Chief Legal Off. & Corp. Sec. | $22,247,461 | -$12,793,435 | -37% | Mixed | 20 Aug 2026 |
| Altos Ventures IV, L.P. | 10%+ Owner | $20,862,868 | Mixed | 09 Feb 2024 | ||
| Arvind Chakravarthy | Chief People & Systems Officer | $18,932,433 | -$9,950,587 | -34% | Mixed | 20 Feb 2026 |
| Daniel Sturman | Chief Technology Officer | $18,926,612 | Mixed | 20 May 2024 | ||
| Anthony P. Lee | Director | $16,964,003 | -$35,370,283 | -68% | Median | 10 Aug 2026 |
| Naveen K. Chopra | Chief Financial Officer | $13,965,325 | -$4,061,402 | -23% | Filing P/S | 20 Aug 2026 |
| Matthew D. Kaufman | Chief Safety Officer | $12,888,183 | -$10,834,489 | -46% | Filing P/S | 20 Aug 2026 |
| Barbara Messing | CMKtg & Communications Officer | $9,037,018 | Mixed | 21 Nov 2023 |
Recent insider transactions for Roblox Corp
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 |
|---|---|---|---|---|---|---|---|---|---|---|
| Sean Jack Buckley | RBLX | Class A Common Stock | Sale | -4.72% | $167,136 | $38.68 | -4,321 | 87,213 | 24 Aug 2026 | Direct |
| Matthew D. Kaufman | RBLX | Class A Common Stock | Sale | -4.26% | $565,761 | $37.96 | -14,904 | 335,060 | 20 Aug 2026 | Direct |
| Sean Jack Buckley | RBLX | Class A Common Stock | Sale | -5.77% | $212,900 | $37.97 | -5,607 | 91,534 | 20 Aug 2026 | Direct |
| Amy M. Rawlings | RBLX | Class A Common Stock | Sale | -6.86% | $192,143 | $37.97 | -5,061 | 68,745 | 20 Aug 2026 | Direct |
| Naveen K. Chopra | RBLX | Class A Common Stock | Sale | -4.6% | $664,663 | $37.96 | -17,509 | 363,249 | 20 Aug 2026 | Direct |
| Mark Reinstra | RBLX | Class A Common Stock | Sale | -4.31% | $680,787 | $37.96 | -17,934 | 398,064 | 20 Aug 2026 | Direct |
| David Baszucki | RBLX | Class A Common Stock | Sale | -6.17% | $1,995,399 | $37.96 | -52,568 | 799,646 | 20 Aug 2026 | Direct |
| Gregory Baszucki | RBLX | Class A Common Stock | Other | -25% | -1,296 | 3,889 | 20 Aug 2026 | Direct | ||
| Gregory Baszucki | RBLX | Phantom Stock | Other | 1,296 | 1,296 | 20 Aug 2026 | Direct | |||
| Jason Kilar | RBLX | Class A Common Stock | Other | -6.41% | -1,296 | 18,927 | 20 Aug 2026 | Direct | ||
| Jason Kilar | RBLX | Phantom Stock | Other | 1,296 | 1,296 | 20 Aug 2026 | Direct | |||
| Gina Mastantuono | RBLX | Class A Common Stock | Other | -6.63% | -1,296 | 18,261 | 20 Aug 2026 | Direct | ||
| Gina Mastantuono | RBLX | Phantom Stock | Other | 1,296 | 1,296 | 20 Aug 2026 | Direct | |||
| Mark Reinstra | RBLX | Class A Common Stock | Sale | -1.48% | $250,000 | $40.00 | -6,250 | 415,998 | 19 Aug 2026 | Direct |
| Anthony P. Lee | RBLX | Class A Common Stock | Gift | 48.4% | 100,000 | 306,768 | 10 Aug 2026 | See footnote | ||
| Anthony P. Lee | RBLX | Class A Common Stock | Gift | -1.6% | -100,000 | 6,157,311 | 10 Aug 2026 | See footnote | ||
| Gregory Baszucki | RBLX | Class A Common Stock | Sale | -1.3% | $624,380 | $37.46 | -16,666 | 1,269,502 | 04 Aug 2026 | See Footnotes |
| Amy M. Rawlings | RBLX | Class A Common Stock | Award | 9.77% | 6,567 | 73,806 | 14 Jul 2026 | Direct | ||
| Mark Reinstra | RBLX | Class A Common Stock | Sale | -1.06% | $258,734 | $57.34 | -4,512 | 422,248 | 06 Jul 2026 | Direct |
| Gregory Baszucki | RBLX | Class A Common Stock | Sale | -1.29% | $961,392 | $57.69 | -16,666 | 1,277,835 | 01 Jul 2026 | See Footnotes |
| Amy M. Rawlings | RBLX | Class A Common Stock | Award | 92.3% | 32,275 | 67,239 | 15 Jun 2026 | Direct | ||
| Mark Reinstra | RBLX | Class A Common Stock | Sale | -1.38% | $249,342 | $41.71 | -5,978 | 426,760 | 08 Jun 2026 | Direct |
| Gregory Baszucki | RBLX | Class A Common Stock | Sale | -1.28% | $777,139 | $46.63 | -16,666 | 1,286,168 | 01 Jun 2026 | See Footnotes |
| Anthony P. Lee | RBLX | Class A Common Stock | Award | 5,185 | 5,185 | 28 May 2026 | Direct | |||
| Gina Mastantuono | RBLX | Class A Common Stock | Award | 36.1% | 5,185 | 19,557 | 28 May 2026 | Direct | ||
| Gregory Baszucki | RBLX | Class A Common Stock | Award | 5,185 | 5,185 | 28 May 2026 | Direct | |||
| Jason Kilar | RBLX | Class A Common Stock | Award | 34.5% | 5,185 | 20,223 | 28 May 2026 | Direct | ||
| Christopher Carvalho | RBLX | Class A Common Stock | Award | 0.47% | 5,185 | 1,112,098 | 28 May 2026 | Direct | ||
| Andrea L. Wong | RBLX | Class A Common Stock | Award | 460.9% | 5,185 | 6,310 | 28 May 2026 | Direct | ||
| Dennis M. Durkin | RBLX | Class A Common Stock | Award | 147.1% | 5,185 | 8,709 | 28 May 2026 | Direct | ||
| Gina Mastantuono | RBLX | Class A Common Stock | Other | -7.27% | -1,126 | 14,372 | 27 May 2026 | Direct | ||
| Gina Mastantuono | RBLX | Phantom Stock | Other | 33.4% | 1,126 | 4,501 | 27 May 2026 | Direct | ||
| Gregory Baszucki | RBLX | Class A Common Stock | Other | -100% | -1,126 | 0 | 27 May 2026 | Direct | ||
| Gregory Baszucki | RBLX | Phantom Stock | Other | 33.4% | 1,126 | 4,501 | 27 May 2026 | Direct | ||
| Jason Kilar | RBLX | Class A Common Stock | Other | -6.97% | -1,126 | 15,038 | 27 May 2026 | Direct | ||
| Jason Kilar | RBLX | Phantom Stock | Other | 33.4% | 1,126 | 4,501 | 27 May 2026 | Direct | ||
| Amy M. Rawlings | RBLX | Class A Common Stock | Sale | -0.78% | $13,152 | $48.00 | -274 | 34,964 | 26 May 2026 | Direct |
| Sean Jack Buckley | RBLX | Class A Common Stock | Sale | -4.66% | $219,932 | $46.36 | -4,744 | 97,141 | 22 May 2026 | Direct |
| Mark Reinstra | RBLX | Class A Common Stock | Sale | -1.25% | $253,357 | $46.40 | -5,460 | 432,738 | 21 May 2026 | Direct |
| Mark Reinstra | RBLX | Class A Common Stock | Sale | -3.79% | $782,170 | $45.28 | -17,275 | 438,198 | 20 May 2026 | Direct |
| Sean Jack Buckley | RBLX | Class A Common Stock | Sale | -5.27% | $256,501 | $45.27 | -5,666 | 101,885 | 20 May 2026 | Direct |
| Naveen K. Chopra | RBLX | Class A Common Stock | Sale | -4.24% | $763,602 | $45.28 | -16,863 | 380,758 | 20 May 2026 | Direct |
| Amy M. Rawlings | RBLX | Class A Common Stock | Sale | -7.59% | $130,969 | $45.24 | -2,895 | 35,238 | 20 May 2026 | Direct |
| Matthew D. Kaufman | RBLX | Class A Common Stock | Sale | -3.94% | $649,956 | $45.27 | -14,356 | 349,964 | 20 May 2026 | Direct |
| David Baszucki | RBLX | Class A Common Stock | Sale | -5.61% | $2,292,446 | $45.28 | -50,628 | 852,214 | 20 May 2026 | Direct |
| Gregory Baszucki | RBLX | Class A Common Stock | Sale | -1.27% | $749,424 | $44.97 | -16,666 | 1,294,501 | 05 May 2026 | See Footnotes |
| Amy M. Rawlings | RBLX | Class A Common Stock | Award | 15.9% | 5,228 | 38,133 | 17 Apr 2026 | Direct | ||
| Matthew D. Kaufman | RBLX | Class A Common Stock | Sale | -3.53% | $772,102 | $57.94 | -13,325 | 364,320 | 13 Apr 2026 | Direct |
| Mark Reinstra | RBLX | Class A Common Stock | Sale | -3.93% | $1,080,808 | $57.94 | -18,653 | 455,473 | 13 Apr 2026 | Direct |
| David Baszucki | RBLX | Class A Common Stock | Conversion of derivative security | 333.3% | 2,687,511 | 3,493,765 | 02 Apr 2026 | See Footnote |
* marks a reported price that did not pass the local price check.