October short interest fluctuations across ETFs and stocks

Reports detail sharp rises and falls in short interest for multiple ETFs and individual stocks during October.

6 stories4044 sourcesUpdated Nov 2, 2026

In this storyline:short interest ratio B.O.S. Better Online Solutions

October short interest fluctuations across ETFs and stocks — Photo: © IJR / Wikimedia Commons

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Oct 30, 2026
Short interest fell sharply in October across five ETFs with declines ranging from 67.1% to 75.8%.
787 sources on this →
Oct 30, 2026
Short interest increased in October across five companies with Perimeter Medical Imaging AI rising 628.8%.
611 sources on this →
Oct 30, 2026
Short interest surged in October for three ETFs while plunging 90.6% for the FlexShares 3 Year TIPS ETF.
577 sources on this →
Oct 30, 2026
Short interest rose sharply in October across five securities measured against very small September baselines.
1022 sources on this →

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Finance

Short Interest Falls 67%-76% Across Five ETFs

Five ETFs saw short interest fall 67% to 76% by mid-October, leaving short positions near 0% of shares and days-to-cover as low as 0.1.

787 sources

Finance

Surge Components Short Interest Falls 70% in October

October short-interest reports showed sharply different moves: short positions fell 83.8% for B.O.S. Better Online Solutions and 70.2% for Surge Component, while short interest in Innovator’s Daily PutWrite ETF rose 320%.

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Five Stocks’ Short Interest Jumps Up to 629%

Short interest increased in October across all five companies: Perimeter Medical Imaging AI rose the most, up 628.8%, followed by Arcadia Biosciences (286.3%), Regentis Biomaterials (223.8%), PIMCO Income Strategy Fund (139.3%) and Bumrungrad Hospital (118.3%). Arcadia had the highest reported share of stock sold short, at 14.9%.

611 sources

Finance

Newbury Street II Short Interest Reportedly Falls 93%

Short interest in Newbury Street II Acquisition Corp.’s Class A shares plunged 93% in October, while short interest in its warrants rose 309%. Weiss Ratings maintained a Sell assessment for both securities, and the company’s shares traded near $10.82 while its warrants were at $0.78.

221 sources

Finance

ETF Short Interest Swings Sharply in October

Short interest surged sharply in October for the WisdomTree High Income Laddered Municipal Fund, Simplify Currency Strategy ETF and SPDR DoubleLine Total Return Tactical ETF, while it plunged 90.6% for the FlexShares 3 Year TIPS ETF. The municipal fund had the highest short-interest share at 3.8%, though its trading volume was low.

577 sources

Finance

Short Interest Rises in Five Securities From Very Small Bases

Short interest rose sharply in October across five securities: Indonesian banks Bank Rakyat Indonesia and Bank Central Asia, PGIM’s Nasdaq-100 Buffer 12 ETF, Else Nutrition and China’s Sino-Ocean Group. The reported jumps were measured against very small September baselines, with estimated days to cover ranging from 0.2 days for Else Nutrition to 72.6 days for Bank Rakyat Indonesia; Sino-Ocean’s ratio could not be calculated because reported trading volume was zero.

1022 sources