JANE STREET GROUP, LLC STX — SEAGATE TECHNOLOGY PLC

Ownership history in JANE STREET GROUP, LLC  ·  121 quarters on record

AI Ownership Summary

JANE STREET GROUP, LLC reported SEAGATE TECHNOLOGY PLC (STX) in 121 quarterly 13F filings from 2024 Q1 through 2026 Q2. Peak portfolio weight reached 0.42% in 2026 Q2. The latest visible filing shows STX at 0.12% of the fund.

This page tracks quarterly shares, estimated market value, portfolio weight, filing dates, and disclosure-aligned stock prices directly from SEC EDGAR 13F filings. Older history is available after unlock; the visible window still shows the most recent pattern.

What this STX ownership page tells you

This page is designed to answer the real investor question behind a 13F filing: how meaningful was JANE STREET GROUP, LLC's position in SEAGATE TECHNOLOGY PLC, and how did that conviction change over time? You can read the holding window, peak weight, latest reported size, disclosure timing, and quarter-by-quarter changes without piecing the story together from raw SEC rows.

Freshest filing
Latest Reported Filing
2026 Q2

STX was reported at 0.12% of portfolio in the most recent visible filing.

High-water mark
Peak Conviction
0.42% in 2026 Q2

Peak weight helps separate a token disclosure from a real conviction holding the fund genuinely cared about.

Time in book
Holding Window
2024 Q1 to 2026 Q2

Longer holding windows often tell a very different story from short-lived tactical trades or one-quarter experiments.

Decision context
Why It Matters
Position size beats headlines

Knowing that a fund owned a stock is useful. Knowing whether it was a 0.20% placeholder or a true high-conviction position is where the signal actually starts.

STX stock page JANE STREET GROUP, LLC fund profile JANE STREET GROUP, LLC full holdings
How JANE STREET GROUP, LLC held STX — position size vs. price
% of Fund (quarterly)    STX price (quarter-end, indexed to 100)    SPY (indexed to 100)    QQQ (indexed to 100)
📋 Quarterly Holdings History 26 quarters  ▾
Quarter Action Sold % After 3M Timing Shares Change Chg % % of Fund Mkt Value Filed Price (Filed)
2026 Q2 REDUCED — — — 1,473,813 -3,719,187 -71.6% 0.12% $1.42B 2026-08-14 $973.44
2026 Q2 ADDED — — — 5,193,000 +3,976,800 +327.0% 0.42% $5.01B 2026-08-14 $973.44
2026 Q2 ADDED — — — 1,216,200 +1,196,498 +6073.0% 0.10% $1.17B 2026-08-14 $973.44
2026 Q1 REDUCED 99.5% +147.4% ❌ 19,702 -3,803,198 -99.5% 0.00% $7.7M 2026-05-12 $808.22
2026 Q1 ADDED — — — 3,822,900 +2,845,800 +291.2% 0.19% $1.50B 2026-05-12 $808.22
2026 Q1 ADDED — — — 977,100 +962,732 +6700.5% 0.05% $382.8M 2026-05-12 $808.22
2025 Q4 REDUCED 99.6% +42.5% ❌ 14,368 -3,602,332 -99.6% 0.00% $4.0M 2026-02-12 $430.11
2025 Q4 ADDED — — — 3,616,700 +2,888,100 +396.4% 0.15% $996.0M 2026-02-12 $430.11
2025 Q4 ADDED — — — 728,600 +655,526 +897.1% 0.03% $200.6M 2026-02-12 $430.11
2025 Q3 REDUCED 75.7% +19.5% ❌ 73,074 -227,326 -75.7% 0.00% $17.2M 2025-11-14 $256.90
2025 Q3 REDUCED 56.0% +19.5% ❌ 300,400 -381,600 -56.0% 0.01% $70.9M 2025-11-14 $256.90
2025 Q3 ADDED — — — 682,000 +571,820 +519.0% 0.02% $161.0M 2025-11-14 $256.90
2025 Q2 REDUCED 82.5% +58.8% ❌ 110,180 -520,220 -82.5% 0.00% $15.9M 2025-08-14 $154.45
2025 Q2 ADDED — — — 630,400 +185,800 +41.8% 0.02% $91.0M 2025-08-14 $154.45
2025 Q2 ADDED — — — 444,600 +432,425 +3551.7% 0.01% $64.2M 2025-08-14 $154.45
2025 Q1 REDUCED 94.2% +70.8% ❌ 12,175 -199,325 -94.2% 0.00% $1.0M 2025-05-14 $103.78
2025 Q1 REDUCED 55.8% +70.8% ❌ 211,500 -267,400 -55.8% 0.00% $18.0M 2025-05-14 $103.78
2025 Q1 ADDED — — — 478,900 +265,822 +124.8% 0.01% $40.7M 2025-05-14 $103.78
2024 Q4 REDUCED 39.1% -0.8% ✅ 213,078 -136,622 -39.1% 0.00% $18.4M 2025-02-14 $99.29
2024 Q4 ADDED — — — 349,700 +72,800 +26.3% 0.01% $30.2M 2025-02-14 $99.29
2024 Q4 ADDED — — — 276,900 +269,751 +3773.3% 0.01% $23.9M 2025-02-14 $99.29
2024 Q3 REDUCED 98.2% -20.4% ✅ 7,149 -394,551 -98.2% 0.00% $783K 2024-11-15 $94.02
2024 Q3 ADDED — — — 401,700 +91,800 +29.6% 0.01% $44.0M 2024-11-15 $94.02
2024 Q3 ADDED — — — 309,900 +30,016 +10.7% 0.01% $33.9M 2024-11-15 $94.02
2024 Q2 ADDED — — — 279,884 +42,562 +17.9% 0.01% $28.9M 2024-08-15 $96.11
2024 Q1 REDUCED 6.9% +10.8% ❌ 237,322 -17,608 -6.9% 0.00% $22.1M 2024-05-16 $94.16
95 older quarters hidden  —  Sign in free or upgrade to Premium to see full history

🏢 Other funds also holding STX

As of 2026 Q2 — sorted by position size

Atalan Capital Partners, LP 3Y 7Y 33.92% Central Asset Investments & Management Holdings (HK) Ltd 3Y 7Y 22.95% Trivest Advisors Ltd 3Y 22.38% Aufman Associates Inc 3Y 19.47% Twin Lakes Capital Management, LLC 3Y 17.94% Panoramic Capital, LLC 16.72% Amanah Holdings Trust 16.42% CACTI ASSET MANAGEMENT LLC 3Y 7Y 15.87% Rivermont Capital Management LP 3Y 15.56% KEYWISE CAPITAL MANAGEMENT (HK) Ltd 3Y 13.41%

FAQ About JANE STREET GROUP, LLC and STX

These are the practical questions this page is built to answer before you even open the full history table.

How long has JANE STREET GROUP, LLC reported owning STX?

JANE STREET GROUP, LLC reported STX across 26 quarterly 13F filings, from 2024 Q1 through 2026 Q2.

What was the largest reported STX position in JANE STREET GROUP, LLC's portfolio?

The largest reported portfolio weight for STX was 0.42% in 2026 Q2.

What is the latest reported STX position on this page?

The most recent filing on this page is 2026 Q2, when JANE STREET GROUP, LLC reported 1,473,813 shares, equal to 0.12% of portfolio, with an estimated market value of $1.42B.

What does the chart on this STX ownership page compare?

The chart compares JANE STREET GROUP, LLC's quarterly STX portfolio weight with the stock's indexed share price, so you can see whether the fund was building, trimming, or holding the position as price moved.

How well did JANE STREET GROUP, LLC time their STX position?

Based on 13F filing dates vs. subsequent STX price moves, JANE STREET GROUP, LLC correctly timed 58 out of 120 reported position changes (48%). The annualised alpha on STX relative to SPY over the holding period was +57.2%.

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