Seagate · ownership
Who owns Seagate?
BlackRock, Inc. is the largest 13F holder: 8.1% of 13F-reported shares calc.
1,946 institutions report 187.2M Seagate shares in Form 13F, as of quarter end Jun 30, 2026; −2.4M shares vs Mar 31, 2026.
- BlackRock, Inc.8.1%15.2M shares · +893K vs prior quarter (up) · 13F filed Aug 7, 2026
- VANGUARD CAPITAL MANAGEMENT LLC7.8%14.6M shares · +474K vs prior quarter (up) · 13F filed Aug 13, 2026
- STATE STREET CORP5.3%9.9M shares · +590K vs prior quarter (up) · 13F filed Aug 7, 2026
- FMR LLC4.4%8.2M shares · −24K vs prior quarter (down) · 13F filed Aug 13, 2026
- VANGUARD PORTFOLIO MANAGEMENT LLC4.3%8.0M shares · −3.1M vs prior quarter (down) · 13F filed Aug 13, 2026
- Invesco Ltd.4.0%7.5M shares · +360K vs prior quarter (up) · 13F filed Aug 14, 2026
- WCM INVESTMENT MANAGEMENT, LLC2.8%5.3M shares · +974K vs prior quarter (up) · 13F filed Aug 13, 2026
- JPMORGAN CHASE & CO2.8%5.2M shares · −1.5M vs prior quarter (down) · 13F filed Aug 12, 2026
- GEODE CAPITAL MANAGEMENT, LLC2.8%5.2M shares · +95K vs prior quarter (up) · 13F filed Aug 12, 2026
- MORGAN STANLEY2.5%4.7M shares · −39K vs prior quarter (down) · 13F filed Aug 13, 2026
- Capital Research Global Investors2.3%4.3M shares · −1.4M vs prior quarter (down) · 13F filed Aug 12, 2026
- Sanders Capital, LLC1.9%3.5M shares · −9.4M vs prior quarter (down) · 13F filed Aug 10, 2026
- GOLDMAN SACHS GROUP INC1.8%3.4M shares · −134K vs prior quarter (down) · 13F filed Aug 14, 2026
- NORGES BANK1.7%3.1M shares · +3.1M vs prior quarter (new position) · 13F filed Aug 12, 2026
- MASSACHUSETTS FINANCIAL SERVICES CO /MA/1.4%2.6M shares · +24K vs prior quarter (up) · 13F filed Aug 3, 2026
- WELLINGTON MANAGEMENT GROUP LLP1.3%2.4M shares · +2.3M vs prior quarter (up) · 13F filed Aug 14, 2026
- ARROWSTREET CAPITAL, LIMITED PARTNERSHIP1.1%2.1M shares · +705K vs prior quarter (up) · 13F filed Aug 13, 2026
- BANK OF AMERICA CORP /DE/1.1%2.1M shares · −1.3M vs prior quarter (down) · 13F filed Aug 14, 2026
- DZ BANK AG Deutsche Zentral Genossenschafts Bank, Frankfurt am Main1.1%2.1M shares · −1.5M vs prior quarter (down) · 13F filed Aug 14, 2026
- NORTHERN TRUST CORP1.0%1.9M shares · +5K vs prior quarter (up) · 13F filed Aug 13, 2026
Share of 13F-reported shares, not of shares outstanding. 13F covers managers with over $100M in US equities; it is not a full shareholder list.
Method and sources
Source: SEC Form 13F data sets (bulk). Each row links to the holder’s own 13F-HR filing. Holder names exactly as filed; one group can file under several names and CIKs (for example two Vanguard entities), and they are listed separately, as filed.
% = the holder’s shares ÷ all shares reported in 13F filings for this company and quarter (calculated by Hollsteen). This is not a share of shares outstanding. Change = shares vs the same filer’s 13F for the prior quarter (Mar 31, 2026).
Erroneous filings and rows are handled by a fixed rule set (restatements replace originals; non-equity rows and implausible rows excluded): 18 erroneous filings excluded or replaced this quarter. No market values are shown.
SEC filings only. No price or market data.
Who holds more than 5%?
2 current Schedule 13D/13G holders
Schedule 13D/13G filings (10) ›
- VANGUARD CAPITAL MANAGEMENT LLC 7.48%
13G filed Apr 30, 2026 · event date Mar 31, 2026
- BlackRock, Inc. 6.1%
13G/A filed Apr 23, 2025 · event date Mar 31, 2025 · 7 earlier filings
- Sanders Capital, LLC 1.56%
below 5% latest filing reports under 5% · 13G/A filed Aug 5, 2026 · event date Jun 30, 2026 · 4 earlier filings
- VANGUARD PORTFOLIO MANAGEMENT LLC 3.56%
below 5% latest filing reports under 5% · 13G/A filed Jul 31, 2026 · event date Jun 30, 2026 · 1 earlier filing
- VANGUARD GROUP INC 0%
below 5% latest filing reports under 5% · 13G/A filed Mar 27, 2026 · event date Mar 13, 2026 · 8 earlier filings
- JPMORGAN CHASE & CO 4%
below 5% latest filing reports under 5% · 13G/A filed Nov 4, 2025 · event date Oct 31, 2025 · 10 earlier filings
- Capital Research Global Investors 3.4%
below 5% latest filing reports under 5% · 13G/A filed Aug 13, 2025 · event date Jun 30, 2025 · 3 earlier filings
- FMR LLC 4.13%
stale filed Nov 12, 2024: older than 18 months, not a current holding · 13G/A filed Nov 12, 2024 · 5 earlier filings
- VA Partners I, LLC 3.7%
stale filed Sep 8, 2023, as of Sep 6, 2023: older than 18 months, not a current holding · 13D/A filed Sep 8, 2023 · 8 earlier filings
- Clearbridge Investments, LLC 3.8%
stale filed Feb 9, 2022, as of Dec 31, 2021: older than 18 months, not a current holding · 13G/A filed Feb 9, 2022 · 4 earlier filings
Method and sources
Schedule 13D (active) and 13G (passive) are filed by holders of more than 5% of a class. The percentage is the holder’s own cover-page “percent of class”. A filing older than 18 months (filed before 2025-04-17) is marked stale and is never shown as a current holding. Data as of Oct 13, 2026.
SEC filings only.
Are insiders buying or selling?
0 open-market purchases, 718 sales in 12 months
Form 4, Oct 13, 2025 – Oct 13, 2026 · 0 shares bought, 883,096 shares sold (net −883K) · as of Oct 13, 2026
Latest 25 of 1163 Form 4 transactions ›
| Date | Insider (as filed) | Transaction | Shares | Held after |
|---|---|---|---|---|
| Oct 1, 2026 | MOSLEY WILLIAM D · Director; CEO | Open-market sale · 10b5-1 | 360 disposed | 372,750 |
| Oct 1, 2026 | MOSLEY WILLIAM D · Director; CEO | Open-market sale · 10b5-1 | 855 disposed | 371,895 |
| Oct 1, 2026 | MOSLEY WILLIAM D · Director; CEO | Open-market sale · 10b5-1 | 1,665 disposed | 370,230 |
| Oct 1, 2026 | MOSLEY WILLIAM D · Director; CEO | Open-market sale · 10b5-1 | 1,320 disposed | 368,910 |
| Oct 1, 2026 | MOSLEY WILLIAM D · Director; CEO | Open-market sale · 10b5-1 | 840 disposed | 368,070 |
| Oct 1, 2026 | MOSLEY WILLIAM D · Director; CEO | Open-market sale · 10b5-1 | 822 disposed | 367,248 |
| Oct 1, 2026 | MOSLEY WILLIAM D · Director; CEO | Open-market sale · 10b5-1 | 640 disposed | 366,608 |
| Oct 1, 2026 | MOSLEY WILLIAM D · Director; CEO | Open-market sale · 10b5-1 | 759 disposed | 365,849 |
| Oct 1, 2026 | MOSLEY WILLIAM D · Director; CEO | Open-market sale · 10b5-1 | 579 disposed | 365,270 |
| Oct 1, 2026 | MOSLEY WILLIAM D · Director; CEO | Open-market sale · 10b5-1 | 640 disposed | 364,630 |
| Oct 1, 2026 | MOSLEY WILLIAM D · Director; CEO | Open-market sale · 10b5-1 | 720 disposed | 363,910 |
| Oct 1, 2026 | MOSLEY WILLIAM D · Director; CEO | Open-market sale · 10b5-1 | 80 disposed | 363,830 |
| Oct 1, 2026 | MOSLEY WILLIAM D · Director; CEO | Open-market sale · 10b5-1 | 40 disposed | 363,790 |
| Oct 1, 2026 | MOSLEY WILLIAM D · Director; CEO | Open-market sale · 10b5-1 | 280 disposed | 363,510 |
| Oct 1, 2026 | MOSLEY WILLIAM D · Director; CEO | Open-market sale · 10b5-1 | 440 disposed | 363,070 |
| Oct 1, 2026 | MOSLEY WILLIAM D · Director; CEO | Open-market sale · 10b5-1 | 962 disposed | 362,108 |
| Oct 1, 2026 | MOSLEY WILLIAM D · Director; CEO | Option exercise / RSU conversion · 10b5-1 | 14,000 acquired | 392,108 |
| Oct 1, 2026 | MOSLEY WILLIAM D · Director; CEO | Open-market sale · 10b5-1 | 360 disposed | 391,748 |
| Oct 1, 2026 | MOSLEY WILLIAM D · Director; CEO | Open-market sale · 10b5-1 | 517 disposed | 391,231 |
| Oct 1, 2026 | MOSLEY WILLIAM D · Director; CEO | Open-market sale · 10b5-1 | 440 disposed | 390,791 |
| Oct 1, 2026 | MOSLEY WILLIAM D · Director; CEO | Open-market sale · 10b5-1 | 384 disposed | 390,407 |
| Oct 1, 2026 | MOSLEY WILLIAM D · Director; CEO | Open-market sale · 10b5-1 | 696 disposed | 389,711 |
| Oct 1, 2026 | MOSLEY WILLIAM D · Director; CEO | Open-market sale · 10b5-1 | 480 disposed | 389,231 |
| Oct 1, 2026 | MOSLEY WILLIAM D · Director; CEO | Open-market sale · 10b5-1 | 480 disposed | 388,751 |
| Oct 1, 2026 | MOSLEY WILLIAM D · Director; CEO | Open-market sale · 10b5-1 | 601 disposed | 388,150 |
Method and sources
Form 4 filings (not 4/A), table I. Open market = transaction codes P (purchase) and S (sale); grants, option exercises, tax withholding and gifts are listed but not counted as buys or sells. Shares and share counts only, as filed; Hollsteen shows no per-share prices. Data is an export, as of Oct 13, 2026, not live.
SEC filings only.