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BSX

Boston Scientific Corp.

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BSX in the last 90 days

Boston Scientific Corp. (BSX) had 7 congress transactions by 2 members and 6 insider purchases worth $9,486,038 by 4 insiders in filings from the last 90 days.

FINRA’s latest report (settlement 15 SEPT 2026) shows 46,504,769 shares held short, 2.4 days to cover, down 3.5% from the report before.

  • Congress: 1 purchase and 6 sales reported, amounts in the bands the law requires.
  • Insiders: open-market purchases only (Form 4 code P); a purchase filed by related owners counts once.
  • Delay: each filing below shows how many days passed between the trade and its publication. None of this is real-time.

Latest filing on file: 25 SEPT 2026 · FINRA settlement 15 SEPT 2026 · public filings, reported as filed

What the price is doing

$43$63 → $43 · -31% over six months

BSX is down 31%. Short sellers still aren't backing off.

Bets against it — they pay off if the price falls — are up 82% over the same stretch.

$63 STARTAPRMAYJUNJULAUGSEPTOCT31 JUL 2026 — LUDWIG EDWARD J — $227,40003 AUG 2026 — Mahoney Michael F — $9,001,40803 AUG 2026 — Habiger David C — $50,08404 AUG 2026 — Habiger David C — $6,80205 AUG 2026 — Habiger David C — $99,93725 AUG 2026 — Morano Susan E — $100,40811 MAY 2026 — Hon. Gilbert Cisneros — $1,001 – $15,00019 MAY 2026 — Hon. Gilbert Cisneros — $1,001 – $15,00029 MAY 2026 — Hon. Gilbert Cisneros — $1,001 – $15,00005 JUN 2026 — Hon. Gilbert Cisneros — $1,001 – $15,00005 JUN 2026 — Hon. Gilbert Cisneros — $1,001 – $15,000 · partial18 AUG 2026 — Hon. Gilbert Cisneros — $1,001 – $15,00031 AUG 2026 — Hon. Kevin Hern — $15,001 – $50,00003 SEPT 2026 — Hon. Kevin Hern — $1,001 – $15,00003 SEPT 2026 — Hon. Kevin Hern — $1,001 – $15,00003 SEPT 2026 — Hon. Kevin Hern — $1,001 – $15,00004 SEPT 2026 — Hon. Kevin Hern — $50,001 – $100,000 · partial09 SEPT 2026 — Hon. Kevin Hern — $50,001 – $100,000NOW $43

Politician & insider activityBoughtSold

Short sellers

11 reports · twice a month

APR 0%peak +124%15 SEPT +82%APRMAYJUNJULAUGSEPTOCT

Money betting BSX falls. Reported twice a month, and it shows up seven working days late.

Politicians

5 buys · 7 sales

Traded over six months

View activity →

Short sellers

Bets up 82%

Over six months · newest 15 SEPT 2026

See the numbers →

Insiders

6 reported

Traded over six months

See the filings →

Quiet Money

Our take on how well BSX holds up when sellers show up.

How it holds up · last 60 trading days

Through 21 SEPT 2026

Vulnerable

When BSX gets hit, it tends to drop more easily than usual.

Lately, BSX has been easier to push down than usual.

That's been true for the last 3 trading days.

The last 6 months

ResilientMixedVulnerable
MAYJUNJULAUGSEPT
31 MAR 2026Now · 21 SEPT 2026

What the filings show

What the filings show · last 90 days

3 of 4 sources

-34Tilted out

Leaning outBalancedLeaning in

The disclosed money is leaning away from this name, on what has actually been filed. Four sources agree on the picture.

Short interest
Short interest rose 64.4% — 28,281,040 to 46,504,769 shares between 15 JUL 2026 and 15 SEPT 2026. See the filings →
-100
Insider purchases
4 insiders disclosed buying $9,486,038 across 5 filings.
+79
Congress
2 members of Congress disclosed 1 purchase and 6 sales. See the filings →
-71

This summarises filings that have already been published — it is not a forecast, a rating of the company, or advice. Every figure above is listed in full further down this page, with the document it came from.

FINRA short interest

Settlement 15 SEPT 2026 · shares held short

46,504,769shares held short

Days to cover

2.35

Avg daily volume

19,748,214

Since last report

-3.46%

As of 15 September 2026, 46,504,769 Boston Scientific Corp. shares were held short — the total across every reporting firm, not one fund's position. That is 1,668,989 shares fewer than the previous report, a 3.46% decrease. At the average daily volume of 19,748,214 shares, that position represents 2.35 days of trading — what the filing calls days to cover.

This is the most recent figure that exists, and it is 17 days old. FINRA collects short interest twice a month, on a settlement date, and publishes it about eight business days later. So nobody has a live short-interest number for BSX — not us, and not anyone quoting one. We print the settlement date on the figure so you always know which day you are looking at.

Across the 12 reports we hold, the position has risen from 23,529,218 shares on 31 March 2026 to 46,504,769 today, a change of 97.6%. The highest reading in that window was 57,491,117 shares on 29 May 2026.

SettlementShares shortDays to cover
15 SEPT 202646,504,7692.35
31 AUG 202648,173,7582.29
14 AUG 202627,617,5541.57
31 JUL 202622,276,2011.01
15 JUL 202628,281,0401.69
30 JUN 202627,938,6241.19
15 JUN 202629,750,3091.44
29 MAY 202657,491,1172.25
15 MAY 202631,423,2981.77
30 APR 202628,642,7371.36
15 APR 202625,614,5581.80
31 MAR 202623,529,2181.43
What is BSX's short interest?
46,504,769 shares, as of the 15 September 2026 settlement date. That is the figure FINRA published, unadjusted.
What percentage of the float is short?
We do not publish that, because FINRA does not publish float. The regulator reports the number of shares held short; turning it into a percentage needs a share count from somewhere else, and different sources disagree about what counts as float. We would rather give you the number that was actually filed than a percentage built on an assumption.
How current is this?
It is 17 days old, and that is as fresh as short interest gets. FINRA measures it twice a month and publishes it seven business days after the settlement date. Any site showing you a "live" short interest figure is showing you something else.
What does days to cover mean?
It is the short position divided by average daily trading volume — here, 2.35. It describes how many days of ordinary trading the position is equivalent to. It is arithmetic from the filing, not a prediction about what will happen.
Where does this come from?
FINRA's consolidated short interest file, which is public. We read it directly and store it unchanged, except that we blank the days-to-cover placeholder FINRA writes when a stock has almost no volume.

Disclosed insider buying on file

$9,486,038across 6 purchases

Open-market purchases only — the amount is a fact, not a verdict.

On file here

Short positions0

Insider purchases6

Congress transactions35

Latest change25 SEPT 2026

SHORT POSITIONS · 0INSIDER BUYS · 6CONGRESS · 35

Insider purchases on file

  • SEC — Form 4 insider purchase

    Morano Susan EDirector

    BOUGHTCommon Stock

    $100,408

    2,040 sh @ $49.22

    25 AUG 2026 → filed 26 AUG 2026

    Filed 1 day after the tradeSEC EDGAR · 0001225208-26-007337 →

  • SEC — Form 4 insider purchase

    Habiger David CDirector

    BOUGHTCommon Stock

    $99,937

    2,100 sh @ $47.589

    05 AUG 2026 → filed 07 AUG 2026

    Filed 2 days after the tradeSEC EDGAR · 0001225208-26-007031 →

  • SEC — Form 4 insider purchase

    Mahoney Michael FDirector / Chairman, President & CEO

    BOUGHTCommon Stock

    $9,001,408

    186,240 sh @ $48.332

    03 AUG 2026 → filed 05 AUG 2026

    Filed 2 days after the tradeSEC EDGAR · 0001225208-26-006950 →

  • SEC — Form 4 insider purchase

    Habiger David CDirector

    BOUGHTCommon Stock

    $50,084

    1,042 sh @ $48.066

    03 AUG 2026 → filed 05 AUG 2026

    Filed 2 days after the tradeSEC EDGAR · 0001225208-26-006951 →

  • SEC — Form 4 insider purchase

    Habiger David CDirector

    BOUGHTCommon Stock

    $6,802

    140 sh @ $48.588

    04 AUG 2026 → filed 05 AUG 2026

    Filed 1 day after the tradeSEC EDGAR · 0001225208-26-006951 →

  • SEC — Form 4 insider purchase

    LUDWIG EDWARD JDirector

    BOUGHTCommon Stock

    $227,400

    5,000 sh @ $45.48

    31 JUL 2026 → filed 03 AUG 2026

    Filed 3 days after the tradeSEC EDGAR · 0001225208-26-006882 →

Congress transactions on file

35 disclosed · newest first · every row links to its filing

WhoAmount as filedTradedFiledLag
Hon. Kevin HernSOLD$50,001 – $100,00009 SEPT 202625 SEPT 202616 days
Hon. Kevin HernSOLD$1,001 – $15,00003 SEPT 202625 SEPT 202622 days
Hon. Kevin HernSOLD$15,001 – $50,00031 AUG 202625 SEPT 202625 days
Hon. Kevin HernSOLD$50,001 – $100,000 · partial04 SEPT 202625 SEPT 202621 days
Hon. Kevin HernSOLD$1,001 – $15,00003 SEPT 202625 SEPT 202622 days
Hon. Kevin HernSOLD$1,001 – $15,00003 SEPT 202625 SEPT 202622 days
Hon. Gilbert CisnerosBOUGHT$1,001 – $15,00018 AUG 202610 SEPT 202623 days
Hon. Gilbert CisnerosBOUGHT$1,001 – $15,00005 JUN 202602 JUL 202627 days
Hon. Gilbert CisnerosSOLD$1,001 – $15,000 · partial05 JUN 202602 JUL 202627 days
Hon. Gilbert CisnerosBOUGHT$1,001 – $15,00011 MAY 202608 JUN 202628 days
Hon. Gilbert CisnerosBOUGHT$1,001 – $15,00019 MAY 202608 JUN 202620 days
Hon. Gilbert CisnerosBOUGHT$1,001 – $15,00029 MAY 202608 JUN 202610 days
Hon. Gilbert CisnerosBOUGHT$1,001 – $15,00010 FEB 202609 MAR 202627 days
Hon. Gilbert CisnerosBOUGHT$1,001 – $15,00030 JAN 202613 FEB 202614 days
Hon. Gilbert CisnerosSOLD$1,001 – $15,000 · partial24 DEC 202512 JAN 202619 days
Hon. Gilbert CisnerosBOUGHT$1,001 – $15,00018 NOV 202515 DEC 202527 days
Hon. Lisa McClainSOLD$1,001 – $15,00030 OCT 202521 NOV 202522 days
Hon. Lisa McClainBOUGHT$1,001 – $15,00030 OCT 202521 NOV 202522 days
Hon. Lisa McClainSOLD$1,001 – $15,00031 OCT 202521 NOV 202521 days
Hon. Gilbert CisnerosBOUGHT$1,001 – $15,00017 OCT 202518 NOV 202532 days
Hon. Kevin HernSOLD$15,001 – $50,000 · partial28 OCT 202516 NOV 202519 days
Hon. Valerie HoyleSOLD$1,001 – $15,00023 SEPT 202510 OCT 202517 days
Hon. Lisa McClainSOLD$1,001 – $15,000 · partial04 AUG 202512 SEPT 202539 days
Hon. Valerie HoyleBOUGHT$1,001 – $15,00029 OCT 202412 SEPT 2025318 days — the law says 45
Hon. Gilbert CisnerosSOLD$1,001 – $15,000 · partial31 JUL 202514 AUG 202514 days
Hon. Lisa McClainBOUGHT$1,001 – $15,00011 DEC 202413 AUG 2025245 days — the law says 45
Hon. Gilbert CisnerosSOLD$1,001 – $15,000 · partial11 JUN 202510 JUL 202529 days
Hon. Gilbert CisnerosSOLD$1,001 – $15,000 · partial26 JUN 202510 JUL 202514 days
Hon. Jefferson ShreveSOLD$15,001 – $50,00012 MAY 202522 JUN 202541 days
Hon. Gilbert CisnerosSOLD$1,001 – $15,000 · partial13 MAY 202506 JUN 202524 days
Hon. Bruce WestermanSOLD$1,001 – $15,00021 APR 202512 MAY 202521 days
Hon. Gilbert CisnerosSOLD$1,001 – $15,000 · partial28 APR 202506 MAY 20258 days
Hon. Bruce WestermanBOUGHT$1,001 – $15,00003 MAR 202516 APR 202544 days
Hon. Gilbert CisnerosSOLD$1,001 – $15,000 · partial17 MAR 202507 APR 202521 days
Hon. Gilbert CisnerosSOLD$1,001 – $15,000 · partial24 FEB 202506 MAR 202510 days
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