Congress trades in Boston Scientific Corporation (BSX)
6 of the members we track disclosed 17 purchases of BSX between 2023-09-13 and 2026-08-18, and 16 sales. Here is what the stock did afterwards.
Every purchase is measured over the three months after the transaction date, against XLV — the ETF standing in for Healthcare & Pharma — over exactly the same dates. The second figure is the one that carries information: the first mostly reflects what the sector did. How BSX was classified.
How these buys are tagged
2 of these purchases were made by a member whose own committee oversees Healthcare & Pharma. 3 are marked Cluster: A buy is marked Cluster when at least one other tracked member of Congress bought the same stock within 30 days of it, regardless of committee membership.
| Buys | Number | Return after 3 months | vs. sector | Beat their sector |
|---|---|---|---|---|
| All buys | 16 | -9.8% | -14.2% | 31% |
| Notable (committee-flagged) | 2 | Too few buys to measure | ||
| Unaligned (no committee overlap) | 14 | -8.5% | -13.5% | 29% |
| Cluster, excl. mega-caps | 3 | Too few buys to measure | ||
| Not clustered, excl. mega-caps | 13 | -8.7% | -12.8% | 38% |
Who bought the most
- Gilbert Ray Cisneros, Jr. — 9 buys
- Markwayne Mullin — 3 buys
- Lisa C. McClain — 2 buys
- Alan Armstrong — 1 buy
- John Boozman — 1 buy
Every disclosed purchase
| Member | Bought disclosed |
Signal | Price | 1W | 1M | 3M | vs sector |
|---|---|---|---|---|---|---|---|
| Gilbert Ray Cisneros, Jr. | 2026-08-18 2026-09-10 |
Unaligned | $50.47 | -1.2% | -13.7% | — | — |
| Gilbert Ray Cisneros, Jr. | 2026-06-05 2026-07-02 |
Unaligned | $48.55 | -3.4% | -7.0% | -1.5% | -13.6% |
| Gilbert Ray Cisneros, Jr. | 2026-05-29 2026-06-08 |
Unaligned | $48.31 | +0.5% | -8.4% | -3.0% | -17.6% |
| Gilbert Ray Cisneros, Jr. | 2026-05-19 2026-06-08 |
Unaligned | $56.81 | +1.5% | -20.3% | -11.2% | -26.4% |
| Gilbert Ray Cisneros, Jr. | 2026-05-11 2026-06-08 |
Unaligned | $53.37 | +4.8% | -9.4% | -5.5% | -23.2% |
| Alan Armstrong | 2026-03-27 2026-07-21 |
Notable | $69.17 | -9.2% | -10.3% | -36.1% | -48.0% |
| Gilbert Ray Cisneros, Jr. | 2026-02-10 2026-03-09 |
Unaligned | $74.25 | +2.7% | -7.7% | -27.1% | -21.0% |
| Gilbert Ray Cisneros, Jr. | 2026-01-30 2026-02-13 |
Unaligned | $93.53 | -18.5% | -17.8% | -39.6% | -33.4% |
| Markwayne Mullin | 2025-12-29 2026-01-16 |
Unaligned | $95.76 | -0.3% | -2.1% | -34.3% | -26.6% |
| Gilbert Ray Cisneros, Jr. | 2025-11-18 2025-12-15 |
Unaligned Cluster | $99.22 | +2.2% | -3.1% | -23.1% | -26.2% |
| Lisa C. McClain | 2025-10-30 2025-11-21 |
Unaligned Cluster | $100.57 | -1.5% | +1.0% | -8.2% | -14.8% |
| Gilbert Ray Cisneros, Jr. | 2025-10-17 2025-11-18 |
Unaligned Cluster | $99.24 | +1.9% | +3.5% | -11.3% | -20.0% |
| John Boozman | 2025-02-13 2025-03-06 |
Notable | $106.14 | -0.7% | -8.5% | -1.2% | +9.7% |
| Lisa C. McClain | 2024-12-11 2025-08-13 |
Unaligned | $90.56 | -2.8% | +4.8% | +6.5% | +4.7% |
| Val T. Hoyle | 2024-10-29 2025-09-12 |
Unaligned | $84.56 | +1.2% | +7.3% | +21.0% | +22.3% |
| Markwayne Mullin | 2023-10-03 2023-11-01 |
Unaligned | $51.54 | +4.4% | +1.9% | +12.2% | +3.3% |
| Markwayne Mullin | 2023-09-13 2023-10-12 |
Unaligned | $53.20 | +1.7% | -6.9% | +6.2% | +3.8% |
Prices are the closing price on the transaction date, not what was paid: filings never disclose an execution price. Blank figures mean the window has not elapsed yet. Sales are not scored — a sale closes a position rather than opening one — so the 16 disclosed sales of BSX are not in this table.
Download the data behind this page, or read how every figure is calculated. Trades in BSX are a small part of the full rankings, which score each member across everything they bought.
Data last updated .