MILLENNIUM MANAGEMENT LLC BSX — BOSTON SCIENT STK Stock

Ownership history in MILLENNIUM MANAGEMENT LLC  ·  152 quarters on record

AI Ownership Summary

MILLENNIUM MANAGEMENT LLC reported BOSTON SCIENT STK Stock (BSX) in 152 quarterly 13F filings from 2023 Q4 through 2025 Q4. Peak portfolio weight reached 0.43% in 2025 Q4. The latest visible filing shows BSX at 0.05% 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 BSX ownership page tells you

This page is designed to answer the real investor question behind a 13F filing: how meaningful was MILLENNIUM MANAGEMENT LLC's position in BOSTON SCIENT STK Stock, 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
2025 Q4

BSX was reported at 0.05% of portfolio in the most recent visible filing.

High-water mark
Peak Conviction
0.43% in 2025 Q4

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

Time in book
Holding Window
2023 Q4 to 2025 Q4

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.

BSX stock page MILLENNIUM MANAGEMENT LLC fund profile MILLENNIUM MANAGEMENT LLC full holdings
How MILLENNIUM MANAGEMENT LLC held BSX — position size vs. price
% of Fund (quarterly)    BSX price (quarter-end, indexed to 100)    SPY (indexed to 100)    QQQ (indexed to 100)
📋 Quarterly Holdings History 27 quarters  ▾
Quarter Action Sold % After 3M Timing Shares Change Chg % % of Fund Mkt Value Filed Price (Filed)
2025 Q4 ADDED — — — 1,261,300 +1,200,700 +1981.4% 0.05% $120.3M 2026-02-14 (Est.) $74.73
2025 Q4 REDUCED 99.5% -34.2% ✅ 60,600 -11,204,190 -99.5% 0.00% $5.8M 2026-02-14 (Est.) $74.73
2025 Q4 ADDED — — — 11,264,790 +11,220,590 +25386.0% 0.43% $1.03B 2026-02-14 (Est.) $74.73
2025 Q3 REDUCED 88.5% -1.9% ✅ 44,200 -338,800 -88.5% 0.00% $4.3M 2025-11-14 $102.69
2025 Q3 REDUCED 95.5% -1.9% ✅ 383,000 -8,141,821 -95.5% 0.02% $37.4M 2025-11-14 $102.69
2025 Q3 ADDED — — — 8,524,821 +3,888,802 +83.9% 0.33% $783.5M 2025-11-14 $102.69
2025 Q2 ADDED — — — 4,636,019 +4,336,719 +1449.0% 0.21% $444.2M 2025-08-14 $104.15
2025 Q2 REDUCED 6.1% -9.7% ✅ 299,300 -19,400 -6.1% 0.02% $32.1M 2025-08-14 $104.15
2025 Q2 ADDED — — — 318,700 +158,500 +98.9% 0.02% $34.2M 2025-08-14 $104.15
2025 Q1 REDUCED 80.1% +6.5% ❌ 160,200 -646,000 -80.1% 0.01% $16.2M 2025-05-15 $104.86
2025 Q1 REDUCED 90.3% +6.5% ❌ 806,200 -7,537,956 -90.3% 0.04% $81.3M 2025-05-15 $104.86
2025 Q1 ADDED — — — 8,344,156 +8,213,556 +6289.1% 0.42% $791.3M 2025-05-15 $104.86
2024 Q4 REDUCED 98.6% +12.9% ❌ 130,600 -8,998,128 -98.6% 0.01% $11.7M 2025-02-14 $106.11
2024 Q4 ADDED — — — 9,128,728 +8,421,228 +1190.3% 0.38% $770.7M 2025-02-14 $106.11
2024 Q4 ADDED — — — 707,500 +28,500 +4.2% 0.03% $63.2M 2025-02-14 $106.11
2024 Q3 ADDED — — — 679,000 +479,300 +240.0% 0.03% $56.9M 2024-11-14 $87.59
2024 Q3 REDUCED 98.2% +7.0% ❌ 199,700 -11,160,032 -98.2% 0.01% $16.7M 2024-11-14 $87.59
2024 Q3 ADDED — — — 11,359,732 +90,349 +0.8% 0.43% $910.0M 2024-11-14 $87.59
2024 Q2 ADDED — — — 11,269,383 +10,973,183 +3704.7% 0.38% $829.4M 2024-08-14 $76.42
2024 Q2 REDUCED 76.2% +8.8% ❌ 296,200 -948,800 -76.2% 0.01% $22.8M 2024-08-14 $76.42
2024 Q2 ADDED — — — 1,245,000 +806,000 +183.6% 0.04% $95.9M 2024-08-14 $76.42
2024 Q1 REDUCED 50.4% +11.6% ❌ 439,000 -446,100 -50.4% 0.01% $30.1M 2024-05-15 $74.45
2024 Q1 REDUCED 90.7% +11.6% ❌ 885,100 -8,594,567 -90.7% 0.03% $60.6M 2024-05-15 $74.45
2024 Q1 ADDED — — — 9,479,667 +8,662,267 +1059.7% 0.26% $615.0M 2024-05-15 $74.45
2023 Q4 REDUCED 54.5% +17.8% ❌ 817,400 -979,400 -54.5% 0.02% $47.3M 2024-02-14 $65.95
2023 Q4 REDUCED 75.6% +17.8% ❌ 1,796,800 -5,571,479 -75.6% 0.04% $103.9M 2024-02-14 $65.95
2023 Q4 ADDED — — — 7,368,279 +6,508,779 +757.3% 0.17% $397.1M 2024-02-14 $65.95
125 older quarters hidden  —  Sign in free or upgrade to Premium to see full history

🏢 Other funds also holding BSX

As of 2026 Q1 — sorted by position size

Sivik Global Healthcare LLC 3Y 7Y 2.95% Westwind Capital 3Y 7Y 2.66% BSN Capital Partners Ltd 3Y 2.36% NORTH POINT PORTFOLIO MANAGERS CORP/OH 3Y 7Y 1.65% TANDEM CAPITAL MANAGEMENT CORP /ADV 3Y 1.61% ZWJ INVESTMENT COUNSEL INC 3Y 7Y 1.59% Fisher Funds Management LTD 1.58% RBA Wealth Management, LLC 3Y 1.44% ARGUS INVESTORS' COUNSEL, INC. 3Y 7Y 1.43% OUTFITTERS FINANCIAL LLC 3Y 1.4%

FAQ About MILLENNIUM MANAGEMENT LLC and BSX

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

How long has MILLENNIUM MANAGEMENT LLC reported owning BSX?

MILLENNIUM MANAGEMENT LLC reported BSX across 27 quarterly 13F filings, from 2023 Q4 through 2025 Q4.

What was the largest reported BSX position in MILLENNIUM MANAGEMENT LLC's portfolio?

The largest reported portfolio weight for BSX was 0.43% in 2025 Q4.

What is the latest reported BSX position on this page?

The most recent filing on this page is 2025 Q4, when MILLENNIUM MANAGEMENT LLC reported 1,261,300 shares, equal to 0.05% of portfolio, with an estimated market value of $120.3M.

What does the chart on this BSX ownership page compare?

The chart compares MILLENNIUM MANAGEMENT LLC's quarterly BSX 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 MILLENNIUM MANAGEMENT LLC time their BSX position?

Based on 13F filing dates vs. subsequent BSX price moves, MILLENNIUM MANAGEMENT LLC correctly timed 71 out of 151 reported position changes (47%). The annualised alpha on BSX relative to SPY over the holding period was -2.2%.

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