VANGUARD GROUP INC
Rank #1
12.5%
- Shares
- 28.12M
- Change
- -20.86K
- Change %
- -7.00%
- Filing
- Dec 31, 2025
Decreased
Methodology published · Market data, model notes, and corrections process are public · Data policy · Corrections policy
NASDAQ · TECHNOLOGY · Holders
Seagate Technology PLC (STX) Institutional Ownership & Insider Trading History
Top STX institutional shareholders, filing changes, and Form 4 insider activity with filters for buys, sales, option exercises, gifts, and tax withholding.
Section freshness
Price Jun 23, 4:00 PM EDT · Statements Mar 30, 8:00 PM EDT
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Data freshness
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Price time means the latest available trade or regular-market close. Other times show when that section was checked or published.
PriceLive
Last traded •
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Fundamentalsevery 1 day
Provider checked •
Source: Market data provider
Analystevery 1 day
Provider checked •
Source: Market data provider
Newsevery 30 min
Latest item •
Source: Market data provider
Ownership read
STX insider sentiment: Mixed, sale-heavy.
VANGUARD GROUP INC is the largest institutional holder. 103 sales and 17 purchases appear in the recent Form 4 filings. Use the filters below to separate real buying and selling from option exercises, gifts, awards, and tax withholding.
Insider flow
STX
Purchases46.30K
Sales127.52K
Directional bars ignore awards, gifts, conversions, and tax withholding rows.
Top holder
28.12M
VANGUARD GROUP INC
Insider stance
Mixed, sale-heavy
$61.30M sold / $1.29M bought
Latest filing
Jun 12, 2026
Most recent holder or insider filing date
Filings shown
240
120 holder / 120 insider
- Holder rows
- 120
- Market data source
- Latest filing
- Jun 12, 2026
- Most recent holder or insider filing date
- Increased / initiated
- 61
- 57 decreased
- Insider rows
- 120
- Market data source
Top 120 institutional holders
Seagate Technology PLC (STX) institutional ownership
Ranked by reported share count, with position changes and latest filing dates where ownership data supplies them.
BLACKROCK
Rank #2
6.33%
- Shares
- 14.27M
- Change
- -1.84M
- Change %
- -11.43%
- Filing
- Mar 31, 2026
Decreased
VANGUARD CAPITAL MANAGEMENT LLC
Rank #3
6.28%
- Shares
- 14.16M
- Change
- +14.16M
- Change %
- —
- Filing
- Mar 31, 2026
Initiated
SANDERS CAPITAL
Rank #4
5.72%
- Shares
- 12.90M
- Change
- -4.28M
- Change %
- -24.93%
- Filing
- Mar 31, 2026
Decreased
VANGUARD PORTFOLIO MANAGEMENT LLC
Rank #5
4.92%
- Shares
- 11.09M
- Change
- +11.09M
- Change %
- —
- Filing
- Mar 31, 2026
Initiated
STATE STREET CORP
Rank #6
4.14%
- Shares
- 9.32M
- Change
- -49.17K
- Change %
- -53.00%
- Filing
- Mar 31, 2026
Decreased
FMR LLC
Rank #7
3.63%
- Shares
- 8.18M
- Change
- +4.42M
- Change %
- +117.49%
- Filing
- Mar 31, 2026
Increased
JPMORGAN CHASE & CO
Rank #8
2.95%
- Shares
- 6.66M
- Change
- -338.74K
- Change %
- -4.84%
- Filing
- Mar 31, 2026
Decreased
CAPITAL RESEARCH GLOBAL INVESTORS
Rank #9
2.55%
- Shares
- 5.74M
- Change
- +1.22M
- Change %
- +27.13%
- Filing
- Mar 31, 2026
Increased
GEODE CAPITAL MANAGEMENT
Rank #10
2.25%
- Shares
- 5.06M
- Change
- +164.01K
- Change %
- +3.35%
- Filing
- Mar 31, 2026
Increased
MORGAN STANLEY
Rank #11
2.11%
- Shares
- 4.76M
- Change
- -558.20K
- Change %
- -10.50%
- Filing
- Mar 31, 2026
Decreased
WCM INVESTMENT MANAGEMENT
Rank #12
1.93%
- Shares
- 4.35M
- Change
- -808.02K
- Change %
- -15.68%
- Filing
- Mar 31, 2026
Decreased
DZ BANK AG DEUTSCHE ZENTRAL GENOSSENSCHAFTS BANK
Rank #13
1.61%
- Shares
- 3.62M
- Change
- -1.80M
- Change %
- -33.16%
- Filing
- Mar 31, 2026
Decreased
GOLDMAN SACHS GROUP INC
Rank #14
1.59%
- Shares
- 3.57M
- Change
- +818.12K
- Change %
- +29.69%
- Filing
- Mar 31, 2026
Increased
FRANKLIN RESOURCES INC
Rank #15
1.56%
- Shares
- 3.52M
- Change
- -507.93K
- Change %
- -12.62%
- Filing
- Mar 31, 2026
Decreased
BANK OF AMERICA CORP
Rank #16
1.50%
- Shares
- 3.38M
- Change
- -900.16K
- Change %
- -21.03%
- Filing
- Mar 31, 2026
Decreased
INVESCO LTD.
Rank #17
1.15%
- Shares
- 2.60M
- Change
- +40.92K
- Change %
- +1.60%
- Filing
- Mar 31, 2026
Increased
MASSACHUSETTS FINANCIAL SERVICES CO
Rank #18
1.13%
- Shares
- 2.54M
- Change
- +527.61K
- Change %
- +26.27%
- Filing
- Mar 31, 2026
Increased
NORTHERN TRUST CORP
Rank #19
0.84%
- Shares
- 1.90M
- Change
- -3.64K
- Change %
- -19.00%
- Filing
- Mar 31, 2026
Decreased
NORGES BANK
Rank #20
0.80%
- Shares
- 1.81M
- Change
- +444.55K
- Change %
- +32.56%
- Filing
- Dec 31, 2025
Increased
NOMURA INVESTMENT MANAGEMENT BUSINESS TRUST
Rank #21
0.80%
- Shares
- 1.80M
- Change
- +1.80M
- Change %
- +36716.63%
- Filing
- Mar 31, 2026
Increased
DEUTSCHE BANK AG\
Rank #22
0.78%
- Shares
- 1.76M
- Change
- +159.21K
- Change %
- +9.95%
- Filing
- Mar 31, 2026
Increased
UBS AM
Rank #23
0.68%
- Shares
- 1.53M
- Change
- +53.89K
- Change %
- +3.64%
- Filing
- Mar 31, 2026
Increased
LEGAL & GENERAL GROUP PLC
Rank #24
0.67%
- Shares
- 1.51M
- Change
- -9.51K
- Change %
- -62.00%
- Filing
- Mar 31, 2026
Decreased
ARROWSTREET CAPITAL
Rank #25
0.64%
- Shares
- 1.43M
- Change
- -1.76M
- Change %
- -55.11%
- Filing
- Mar 31, 2026
Decreased
CHARLES SCHWAB INVESTMENT MANAGEMENT INC
Rank #26
0.61%
- Shares
- 1.36M
- Change
- -12.95K
- Change %
- -94.00%
- Filing
- Mar 31, 2026
Decreased
D. E. SHAW & CO.
Rank #27
0.57%
- Shares
- 1.29M
- Change
- +493.10K
- Change %
- +61.91%
- Filing
- Mar 31, 2026
Increased
PRICE T ROWE ASSOCIATES INC
Rank #28
0.56%
- Shares
- 1.26M
- Change
- +95.20K
- Change %
- +8.18%
- Filing
- Mar 31, 2026
Increased
VANGUARD FIDUCIARY TRUST CO
Rank #29
0.53%
- Shares
- 1.20M
- Change
- +1.20M
- Change %
- —
- Filing
- Mar 31, 2026
Initiated
HOLOCENE ADVISORS
Rank #30
0.48%
- Shares
- 1.09M
- Change
- +328.50K
- Change %
- +43.27%
- Filing
- Mar 31, 2026
Increased
BANK OF NEW YORK MELLON CORP
Rank #31
0.47%
- Shares
- 1.06M
- Change
- -183.65K
- Change %
- -14.79%
- Filing
- Mar 31, 2026
Decreased
ROYAL BANK OF CANADA
Rank #32
0.45%
- Shares
- 1.01M
- Change
- -20.89K
- Change %
- -2.02%
- Filing
- Mar 31, 2026
Decreased
BANK OF MONTREAL
Rank #33
0.45%
- Shares
- 1.01M
- Change
- +214.45K
- Change %
- +27.01%
- Filing
- Mar 31, 2026
Increased
AQR CAPITAL MANAGEMENT LLC
Rank #34
0.44%
- Shares
- 1.00M
- Change
- +148.57K
- Change %
- +17.43%
- Filing
- Mar 31, 2026
Increased
JANUS HENDERSON GROUP PLC
Rank #35
0.43%
- Shares
- 967.53K
- Change
- +943.17K
- Change %
- +3872.12%
- Filing
- Mar 31, 2026
Increased
RUSSELL INVESTMENTS GROUP
Rank #36
0.43%
- Shares
- 966.46K
- Change
- +9.75K
- Change %
- +102.00%
- Filing
- Mar 31, 2026
Increased
AMUNDI
Rank #37
0.43%
- Shares
- 965.57K
- Change
- +235.36K
- Change %
- +32.23%
- Filing
- Mar 31, 2026
Increased
POLAR CAPITAL HOLDINGS PLC
Rank #38
0.41%
- Shares
- 933.86K
- Change
- -295.55K
- Change %
- -24.04%
- Filing
- Mar 31, 2026
Decreased
VALUE ALIGNED RESEARCH ADVISORS
Rank #39
0.41%
- Shares
- 914.66K
- Change
- +788.38K
- Change %
- +624.30%
- Filing
- Mar 31, 2026
Increased
CANADA PENSION PLAN INVESTMENT BOARD
Rank #40
0.39%
- Shares
- 883.57K
- Change
- -25.82K
- Change %
- -2.84%
- Filing
- Mar 31, 2026
Decreased
| # | Institution | % held | Shares | Change | Change % | Filing date |
|---|---|---|---|---|---|---|
| 1 | 12.5% | 28.12M | -20.86K Decreased | -7.00% | Dec 31, 2025 | |
| 2 | 6.33% | 14.27M | -1.84M Decreased | -11.43% | Mar 31, 2026 | |
| 3 | 6.28% | 14.16M | +14.16M Initiated | — | Mar 31, 2026 | |
| 4 | SANDERS CAPITAL | 5.72% | 12.90M | -4.28M Decreased | -24.93% | Mar 31, 2026 |
| 5 | 4.92% | 11.09M | +11.09M Initiated | — | Mar 31, 2026 | |
| 6 | 4.14% | 9.32M | -49.17K Decreased | -53.00% | Mar 31, 2026 | |
| 7 | 3.63% | 8.18M | +4.42M Increased | +117.49% | Mar 31, 2026 | |
| 8 | 2.95% | 6.66M | -338.74K Decreased | -4.84% | Mar 31, 2026 | |
| 9 | 2.55% | 5.74M | +1.22M Increased | +27.13% | Mar 31, 2026 | |
| 10 | 2.25% | 5.06M | +164.01K Increased | +3.35% | Mar 31, 2026 | |
| 11 | 2.11% | 4.76M | -558.20K Decreased | -10.50% | Mar 31, 2026 | |
| 12 | WCM INVESTMENT MANAGEMENT | 1.93% | 4.35M | -808.02K Decreased | -15.68% | Mar 31, 2026 |
| 13 | DZ BANK AG DEUTSCHE ZENTRAL GENOSSENSCHAFTS BANK | 1.61% | 3.62M | -1.80M Decreased | -33.16% | Mar 31, 2026 |
| 14 | 1.59% | 3.57M | +818.12K Increased | +29.69% | Mar 31, 2026 | |
| 15 | 1.56% | 3.52M | -507.93K Decreased | -12.62% | Mar 31, 2026 | |
| 16 | 1.50% | 3.38M | -900.16K Decreased | -21.03% | Mar 31, 2026 | |
| 17 | 1.15% | 2.60M | +40.92K Increased | +1.60% | Mar 31, 2026 | |
| 18 | MASSACHUSETTS FINANCIAL SERVICES CO | 1.13% | 2.54M | +527.61K Increased | +26.27% | Mar 31, 2026 |
| 19 | 0.84% | 1.90M | -3.64K Decreased | -19.00% | Mar 31, 2026 | |
| 20 | 0.80% | 1.81M | +444.55K Increased | +32.56% | Dec 31, 2025 | |
| 21 | NOMURA INVESTMENT MANAGEMENT BUSINESS TRUST | 0.80% | 1.80M | +1.80M Increased | +36716.63% | Mar 31, 2026 |
| 22 | DEUTSCHE BANK AG\ | 0.78% | 1.76M | +159.21K Increased | +9.95% | Mar 31, 2026 |
| 23 | 0.68% | 1.53M | +53.89K Increased | +3.64% | Mar 31, 2026 | |
| 24 | 0.67% | 1.51M | -9.51K Decreased | -62.00% | Mar 31, 2026 | |
| 25 | ARROWSTREET CAPITAL | 0.64% | 1.43M | -1.76M Decreased | -55.11% | Mar 31, 2026 |
| 26 | 0.61% | 1.36M | -12.95K Decreased | -94.00% | Mar 31, 2026 | |
| 27 | 0.57% | 1.29M | +493.10K Increased | +61.91% | Mar 31, 2026 | |
| 28 | 0.56% | 1.26M | +95.20K Increased | +8.18% | Mar 31, 2026 | |
| 29 | 0.53% | 1.20M | +1.20M Initiated | — | Mar 31, 2026 | |
| 30 | HOLOCENE ADVISORS | 0.48% | 1.09M | +328.50K Increased | +43.27% | Mar 31, 2026 |
| 31 | BANK OF NEW YORK MELLON CORP | 0.47% | 1.06M | -183.65K Decreased | -14.79% | Mar 31, 2026 |
| 32 | ROYAL BANK OF CANADA | 0.45% | 1.01M | -20.89K Decreased | -2.02% | Mar 31, 2026 |
| 33 | BANK OF MONTREAL | 0.45% | 1.01M | +214.45K Increased | +27.01% | Mar 31, 2026 |
| 34 | AQR CAPITAL MANAGEMENT LLC | 0.44% | 1.00M | +148.57K Increased | +17.43% | Mar 31, 2026 |
| 35 | JANUS HENDERSON GROUP PLC | 0.43% | 967.53K | +943.17K Increased | +3872.12% | Mar 31, 2026 |
| 36 | RUSSELL INVESTMENTS GROUP | 0.43% | 966.46K | +9.75K Increased | +102.00% | Mar 31, 2026 |
| 37 | 0.43% | 965.57K | +235.36K Increased | +32.23% | Mar 31, 2026 | |
| 38 | POLAR CAPITAL HOLDINGS PLC | 0.41% | 933.86K | -295.55K Decreased | -24.04% | Mar 31, 2026 |
| 39 | VALUE ALIGNED RESEARCH ADVISORS | 0.41% | 914.66K | +788.38K Increased | +624.30% | Mar 31, 2026 |
| 40 | CANADA PENSION PLAN INVESTMENT BOARD | 0.39% | 883.57K | -25.82K Decreased | -2.84% | Mar 31, 2026 |
Showing 40 of 120 matching institutional rows.Load more institutions
Recent insider transactions
Seagate Technology PLC (STX) Form 4 filings
Action codes are translated so open-market buys and sales are separate from awards, gifts, conversions, and tax withholding.
MORRIS, JOHN CHRISTOPHER
EVP & CTO
- Shares
- 466
- % company
- <0.01%
- Price
- $880.19
- Value
- $410,169
Filed Jun 12, 2026
TEH, BAN SENG
EVP & Chief Commercial Officer
- Shares
- 989
- % company
- <0.01%
- Price
- $880.19
- Value
- $870,508
Filed Jun 12, 2026
MORRIS, JOHN CHRISTOPHER
EVP & CTO
- Shares
- 898
- % company
- <0.01%
- Price
- $880.19
- Value
- $790,411
Filed Jun 12, 2026
ROMANO, GIANLUCA
EVP & CFO
- Shares
- 903
- % company
- <0.01%
- Price
- $880.19
- Value
- $795,029
Filed Jun 12, 2026
MOSLEY, WILLIAM D
Director, CEO
- Shares
- 1.77K
- % company
- <0.01%
- Price
- $880.19
- Value
- $1,556,394
Filed Jun 12, 2026
TEH, BAN SENG
EVP & Chief Commercial Officer
- Shares
- 989
- % company
- <0.01%
- Price
- Not reported
- Value
- Not reported
Filed Jun 11, 2026
CHONG, KIAN FATT
EVP Global Operations
- Shares
- 678
- % company
- <0.01%
- Price
- Not reported
- Value
- Not reported
Filed Jun 11, 2026
CHONG, KIAN FATT
EVP Global Operations
- Shares
- 678
- % company
- <0.01%
- Price
- Not reported
- Value
- Not reported
Filed Jun 11, 2026
ROMANO, GIANLUCA
EVP & CFO
- Shares
- 1.70K
- % company
- <0.01%
- Price
- Not reported
- Value
- Not reported
Filed Jun 11, 2026
MOSLEY, WILLIAM D
Director, CEO
- Shares
- 3.32K
- % company
- <0.01%
- Price
- Not reported
- Value
- Not reported
Filed Jun 11, 2026
ROMANO, GIANLUCA
EVP & CFO
- Shares
- 1.70K
- % company
- <0.01%
- Price
- Not reported
- Value
- Not reported
Filed Jun 11, 2026
MOSLEY, WILLIAM D
Director, CEO
- Shares
- 3.32K
- % company
- <0.01%
- Price
- Not reported
- Value
- Not reported
Filed Jun 11, 2026
| # | Insider | % company | Action | Shares | Price | Value | Filing date |
|---|---|---|---|---|---|---|---|
| 1 | MORRIS, JOHN CHRISTOPHER EVP & CTO | <0.01% | SaleOpen-market or direct sale reported on Form 4. | 466 | $880.19 | $410,169 | Jun 12, 2026 |
| 2 | TEH, BAN SENG EVP & Chief Commercial Officer | <0.01% | SaleOpen-market or direct sale reported on Form 4. | 989 | $880.19 | $870,508 | Jun 12, 2026 |
| 3 | MORRIS, JOHN CHRISTOPHER EVP & CTO | <0.01% | SaleOpen-market or direct sale reported on Form 4. | 898 | $880.19 | $790,411 | Jun 12, 2026 |
| 4 | ROMANO, GIANLUCA EVP & CFO | <0.01% | SaleOpen-market or direct sale reported on Form 4. | 903 | $880.19 | $795,029 | Jun 12, 2026 |
| 5 | MOSLEY, WILLIAM D Director, CEO | <0.01% | SaleOpen-market or direct sale reported on Form 4. | 1.77K | $880.19 | $1,556,394 | Jun 12, 2026 |
| 6 | TEH, BAN SENG EVP & Chief Commercial Officer | <0.01% | SaleOpen-market or direct sale reported on Form 4. | 989 | Not reported | Not reported | Jun 11, 2026 |
| 7 | CHONG, KIAN FATT EVP Global Operations | <0.01% | PurchaseOpen-market or direct purchase reported on Form 4. | 678 | Not reported | Not reported | Jun 11, 2026 |
| 8 | CHONG, KIAN FATT EVP Global Operations | <0.01% | SaleOpen-market or direct sale reported on Form 4. | 678 | Not reported | Not reported | Jun 11, 2026 |
| 9 | ROMANO, GIANLUCA EVP & CFO | <0.01% | PurchaseOpen-market or direct purchase reported on Form 4. | 1.70K | Not reported | Not reported | Jun 11, 2026 |
| 10 | MOSLEY, WILLIAM D Director, CEO | <0.01% | PurchaseOpen-market or direct purchase reported on Form 4. | 3.32K | Not reported | Not reported | Jun 11, 2026 |
| 11 | ROMANO, GIANLUCA EVP & CFO | <0.01% | SaleOpen-market or direct sale reported on Form 4. | 1.70K | Not reported | Not reported | Jun 11, 2026 |
| 12 | MOSLEY, WILLIAM D Director, CEO | <0.01% | SaleOpen-market or direct sale reported on Form 4. | 3.32K | Not reported | Not reported | Jun 11, 2026 |
Showing 12 of 120 matching Form 4 rows. Percent of company uses current shares outstanding when available.Load more insiders
Frequently asked
Common questions.
Who are the largest STX shareholders?
VANGUARD GROUP INC is the largest institutional holder of STX, with 28.12 million shares, or about 12.48% of shares outstanding. Additional institutions are ranked by reported share count.
What is institutional ownership of STX?
Seagate Technology PLC (STX) has 120 institutional holders on file — 61 that increased or initiated positions and 57 that reduced them, as of the latest filing on Mar 31, 2026.
Where can I see Seagate Technology PLC insider transactions?
Seagate Technology PLC (STX) has 120 Form 4 insider transactions on file, most recently on Jun 12, 2026, separated into purchases, sales, option exercises, awards, gifts, and tax withholding so administrative transactions are distinguished from open-market trades.
Are STX insiders buying or selling?
Recent STX insider activity reads Mixed, sale-heavy: 103 sales and 17 purchases. Awards, gifts, conversions, and tax withholding are listed separately because they do not carry the same signal as open-market trades.
Who is the most active STX insider?
MOSLEY, WILLIAM D is the most active STX insider by absolute share movement, with 137,721 shares moving across the filing history. Review the action labels before treating that activity as buying or selling.