Boston Scientific Corporation· BSX

🇺🇸 US · LargeSP500NYSE

HealthcareMedical - DevicesWebsite

Price: $51.43
Day: -0.77%
Mkt Cap: $76.44B
52W Range: $42.20 – $109.50
Volume: 12.90M
Beta: 0.57

D55D FrameworkQuarterly Data

Holdings Analysis

Insider activity, institutional flows, and fund ownership.

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Boston Scientific Corporation

BSX|Healthcare|Medical - Devices

Current price: $51

Smart Money

Dimension 5 of 5

Insider Activity, Q3 2026

Latest scored quarter, net flow, and top transactions by value

Net dollar flow$9.4M

Net share flow+194.5K

Purchases5 ($9.4M)

Sales0 ($0)

Top Notable Transactions

Insider

Type

Value

Date

Mahoney Michael F

Sale

$16.4M

Apr 1

Mahoney Michael F

Sale

$14.9M

Feb 2

Mahoney Michael F

Sale

$13.6M

Nov 5

Institutional Ownership, Q2 2026

Ownership share, position changes, share flow, and top holders

Ownership90.0%

13F share flow-31.1%

Investors holding1.5K

+882 adding-970 reducing

155

727

595

375

New 155Inc 727Red 595Closed 375

Top Institutional Holders

Institution

Value

Change

BLACKROCK, INC.

$5.5B

-1.6%

VANGUARD CAPITAL MANAGEMENT LLC

$4.1B

+0.7%

STATE STREET CORP

$3.0B

+3.1%

PRIMECAP MANAGEMENT CO/CA/

$2.2B

+55.3%

ETF & Mutual Fund Activity, Q2 2026

Latest meaningful quarter: fund-by-fund buying / unchanged / selling

Funds reporting308

Total shares held196.3M

Share flow-15.3%

82 buying90 selling

137

Buying 82Unchanged 137Selling 90

Top Fund Holders

Fund

Weight

Change

PARNASSUS INCOME FUNDS

6.2M

692.48%

PARNASSUS FUNDS

1.2M

121.69%

+474.1K

PACIFIC SELECT FUND

655.8K

0.07%

-125.1K

LINCOLN VARIABLE INSURANCE PRODUCTS TRUST

514.4K

0.04%

-82.7K

See the complete picture

The full 5D Framework: Business Quality · Peer Comparison · Valuation · Analyst Sentiment · Smart Money

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Generated August 18, 2026

For educational purposes only. Not financial advice. Data may be delayed or incomplete.

Smart Money Sentiment

BSX Smart Money Sentiment Score

A weighted 1-5 sentiment score across three smart money signals.

Smart Money

3.8/5

Bullish

Weighted across 3 components

Component Breakdown (3 of 3 available)

Insider Activity

40% weight

+100

Institutional Flow

50% weight

-6

Fund Flow

10% weight

Overall Smart Money sentiment of 3.8/5 (Bullish) based on a weighted combination of 3 components. Insider activity uses a relative-baseline comparison against the stock's own history; institutional flow tracks position momentum and 13F share changes; fund flow measures ETF / mutual-fund buying vs selling. Higher scores indicate stronger bullish sentiment from professional investors.Last updated August 17, 2026.

Insider Trading Activity

Insider trading analysis comparing the latest quarter against the stock's own historical baseline.

Insider Activity for BSX

Net insider share flow by quarter (C-suite & director purchases minus sales)

Very Bullish

Strong insider buying in Q3 2026

Major: 5 purchases totaling $9.4M (194.5K shares)

Share volume is 3x+ above the historical average, unusually strong

Buying is rare, only seen in 2 of 7 quarters

Notable Recent Transactions, BSX

Top 8 highest-value recent insider trades

Mahoney Michael F

CEO

Sell

164,442 shares at $100.01

Apr 1, 2025$16.45M

Mahoney Michael F

CEO

Sell

159,701 shares at $93.49

Feb 2, 2026$14.93M

Mahoney Michael F

CEO

Sell

160,182 shares at $84.74

Nov 5, 2024$13.57M

Mahoney Michael F

CEO

Sell

162,777 shares at $81.17

Sep 5, 2024$13.21M

Fitzgerald Joseph Michael

Officer

Sell

132,527 shares at $85.00

Oct 7, 2024$11.26M

Mahoney Michael F

CEO

Sell

91,282 shares at $102.13

May 1, 2025$9.32M

Mahoney Michael F

CEO

Sell

89,921 shares at $103.39

Jun 2, 2025$9.30M

Mahoney Michael F

CEO

Buy

186,240 shares at $48.33

Aug 3, 2026$9.00M

Institutional Ownership Analysis

Institutional ownership analysis with position momentum, 13F share flow, and ownership percentage trends.

Institutional Ownership Over Time for BSX

Total dollar value invested by institutions each quarter

Neutral

Mixed institutional activity in Q2 2026

90.0% institutional ownership

Balanced activity: 882 adding vs 970 reducing

13F share count essentially flat

Momentum weakening from prior quarter

Position Changes

Q2 2026: how are institutions adjusting their positions?

+882 growing-970 shrinkingNet: -88

155

727

595

375

New (155)

Increased (727)

Reduced (595)

Closed (375)

Top Institutional Holders, BSX

Largest 8 institutional positions by ownership percentage as of Q2 2026

BLACKROCK, INC.

129.7M

$5.5B

Ownership

8.73%

-1.6%

VANGUARD CAPITAL MANAGEMENT LLC

97.1M

$4.1B

Ownership

6.54%

+0.7%

STATE STREET CORP

70.1M

$3.0B

Ownership

4.72%

+3.1%

PRIMECAP MANAGEMENT CO/CA/

50.5M

$2.2B

Ownership

3.40%

+55.3%

FMR LLC

45.7M

$2.0B

Ownership

3.08%

-38.4%

GEODE CAPITAL MANAGEMENT, LLC

33.4M

$1.4B

Ownership

2.25%

+0.5%

D. E. SHAW & CO., INC.

25.5M

$1.1B

Ownership

1.71%

+4.7%

MASSACHUSETTS FINANCIAL SERVICES CO /MA/

24.9M

$1.5B

Ownership

1.67%

+126.1%

ETF and Mutual Fund Holdings

ETF and mutual fund activity breakdown showing buying vs selling funds, top fund holders, and detailed holdings.

Fund Activity

Q2 2026: 309 ETFs and mutual funds reporting

82 buying90 sellingNet: -8

137

Buying (82)

Unchanged (137)

Selling (90)

Neutral

Mixed fund activity in Q2 2026

309 ETFs and mutual funds reporting

82 buying vs 90 selling (balanced)

Top Fund Holders, BSX

Largest 8 ETF and mutual fund positions by shares held as of latest filing

PARNASSUS INCOME FUNDS

6.2M

Weight

692.48%

No change

PARNASSUS FUNDS

1.2M

Weight

121.69%

Increased

PACIFIC SELECT FUND

655.8K

Weight

0.07%

Decreased

LINCOLN VARIABLE INSURANCE PRODUCTS TRUST

514.4K

Weight

0.04%

Decreased

ADAMS DIVERSIFIED EQUITY FUND, INC.

213.7K

Weight

51.24%

No change

HOMESTEAD FUNDS INC

164.4K

Weight

3.08%

Decreased

Guardian Variable Products Trust

66.1K

Weight

0.51%

Increased

Absolute Shares Trust

21.7K

Weight

5.85%

No change

Boston Scientific Corporation· BSX

Holdings Analysis

Insider Trading Activity

1.3Transaction History129Real market purchases and sales onlyShow All Types

Institutional Ownership Analysis

2.4Detailed Holdings172Most recent institutional positions with changes and valuations

ETF and Mutual Fund Holdings

3.3Fund Holdings Details25Most recent ETF and mutual fund holdings with share counts and weights

Search stocks

Holdings Analysis

Insider Trading Activity

1.3Transaction History129Real market purchases and sales onlyShow All Types

Institutional Ownership Analysis

2.4Detailed Holdings172Most recent institutional positions with changes and valuations

ETF and Mutual Fund Holdings

3.3Fund Holdings Details25Most recent ETF and mutual fund holdings with share counts and weights