BSX Boston Scientific Corp.

together opposite · bar = ρ at each lag, −10 … 0 … +10 days · holdout ρ · click a card for the full picture

BSX vs IHI

Both indexed to 100 at 2026-05-11.

BSX IHI · range 78–127 · 2026-05-11 → 2026-11-06

Same day, ranked by what's left after the market and sector factors are removed ("beyond mkt").

IHI iShares U.S. Medical Devices ETF

ρ +0.63beyond mkt +0.52holdout +0.69stable 100%robust

PEN Penumbra, Inc.

ρ +0.53beyond mkt +0.45holdout +0.90stable 100%robust

XHE State Street SPDR S&P Health Care Equipment ETF

ρ +0.49beyond mkt +0.39holdout +0.60stable 100%robust

MMSI Merit Medical Systems, Inc. Common Stock

ρ +0.51beyond mkt +0.38holdout +0.62stable 100%robust

SYK Stryker Corporation

ρ +0.52beyond mkt +0.37holdout +0.55stable 100%robust

ISRG Intuitive Surgical, Inc. Common Stock

ρ +0.47beyond mkt +0.33holdout +0.50stable 100%robust

No day-to-day relationship, but 5- or 10-day returns move together.

CTSH Cognizant Technology Solutions Corporation Class A Common Stock

horizon 10dρ +0.41holdout +0.46stable 62%moderate

MRSH Marsh

horizon 5dρ +0.36holdout +0.40stable 88%robust

Biggest shifts in same-day correlation over the last 63 trading days versus the year before.

RMR The RMR Group Inc. Class A Common Stock

Δ +0.56recent +0.59prior +0.03beyond mkt -0.02

HELE Helen of Troy Limited Common Stock

Δ +0.52recent +0.56prior +0.04beyond mkt -0.02

NGS Natural Gas Services Group, Inc.

Δ -0.52recent -0.36prior +0.16beyond mkt +0.09

AROC Archrock Inc

Δ -0.51recent -0.32prior +0.19beyond mkt +0.06

UNM Unum Group

Δ -0.51recent -0.20prior +0.31beyond mkt +0.01

EPD Enterprise Products Partners L.P.

Δ -0.50recent -0.34prior +0.16beyond mkt -0.02

Strong beyond-the-market co-movement with few shared neighbours.

Symbol	beyond mkt	raw ρ	shared
IHI iShares U.S. Medical Devices ETF	+0.52	+0.63	17
XHE State Street SPDR S&P Health Care Equipment ETF	+0.39	+0.49	13
MMSI Merit Medical Systems, Inc. Common Stock	+0.38	+0.51	14
SYK Stryker Corporation	+0.37	+0.52	15
PEN Penumbra, Inc.	+0.45	+0.53	19