October is historically the most volatile month for stocks. But why? These 4 popular theories fail to hold up.
Published . Updated .
Although October historically has been the most volatile month of the year, you shouldn’t bet that it will continue to be in the future.
Directly affected
- BPOP Popular
Named in this report.
Indirectly affected
- BAMG BROOKSTONE GROWTH STOCK ETF
GA selected BAMG as a RELATED security because its canonical security name directly matches this event's themes: stocks. This is an explainable DERIVED market relationship, not a claim that the security was named in the source article.
- BAMV BROOKSTONE VALUE STOCK ETF
GA selected BAMV as a RELATED security because its canonical security name directly matches this event's themes: stocks. This is an explainable DERIVED market relationship, not a claim that the security was named in the source article.
- BOCT INNOVATOR U.S. EQUITY BUFFER ETF - OCTOBER
GA selected BOCT as a RELATED security because its canonical security name directly matches this event's themes: october. This is an explainable DERIVED market relationship, not a claim that the security was named in the source article.
- CGOV CORGI ETF TR I 0-3 MONTH T-BIL
GA selected CGOV as a RELATED security because its canonical security name directly matches this event's themes: month. This is an explainable DERIVED market relationship, not a claim that the security was named in the source article.
- FOCT FT VEST U.S. EQUITY BUFFER ETF - OCTOBER
GA selected FOCT as a RELATED security because its canonical security name directly matches this event's themes: october. This is an explainable DERIVED market relationship, not a claim that the security was named in the source article.
- GOCT FT VEST U.S. EQUITY MODERATE BUFFER ETF - OCTOBER
GA selected GOCT as a RELATED security because its canonical security name directly matches this event's themes: october. This is an explainable DERIVED market relationship, not a claim that the security was named in the source article.
Price reaction, T-5 to T+3
Although October historically has been the most volatile month of the year, you shouldn’t bet that it will continue to be in the future.
Source: MarketWatch
How far Popular (BPOP) has moved since 28 Sep 2026
Since the first closing price after “October is historically the most volatile month for stocks. But why? These 4 popular theories fail to hold up.,” Popular (BPOP) is +1.36%. The S&P 500 fund (SPY) is +0.29% over the same days, a +1.07% difference versus the market.
Who gains and who loses around Popular (BPOP)
Companies tied to this story
- BPOP Popular
For “October is historically the most volatile month for stocks. But why? These 4 popular theories fail to hold up.,” Popular (BPOP) is linked, with no stored direction, high confidence. Reason on file: The reported development directly names POPULAR INC in the headline; GA resolved that company to BPOP
- BAMG Brookstone Growth Stock Etf
In “October is historically the most volatile month for stocks. But why? These 4 popular theories fail to hold up.,” Brookstone Growth Stock Etf (BAMG) is linked, with no stored direction, medium confidence. Reason on file: GA selected BAMG as a RELATED security because its canonical security name directly matches this event's themes: stocks. This is an explainable DERIVED market relationship, not a claim that the security was named in the source article
- BAMV Brookstone Value Stock Etf
In “October is historically the most volatile month for stocks. But why? These 4 popular theories fail to hold up.,” Brookstone Value Stock Etf (BAMV) is linked, with no stored direction, medium confidence. Reason on file: GA selected BAMV as a RELATED security because its canonical security name directly matches this event's themes: stocks. This is an explainable DERIVED market relationship, not a claim that the security was named in the source article
- BOCT Innovator U.S. Equity Buffer Etf - October
In “October is historically the most volatile month for stocks. But why? These 4 popular theories fail to hold up.,” Innovator U.S. Equity Buffer Etf - October (BOCT) is linked, with no stored direction, medium confidence. Reason on file: GA selected BOCT as a RELATED security because its canonical security name directly matches this event's themes: october. This is an explainable DERIVED market relationship, not a claim that the security was named in the source article
- CGOV Corgi Etf Tr I 0-3 Month T-Bil
Corgi Etf Tr I 0-3 Month T-Bil (CGOV) is linked, with no stored direction, medium confidence in the 28 Sep 2026 story “October is historically the most volatile month for stocks. But why? These 4 popular theories fail to hold up..” Reason on file: GA selected CGOV as a RELATED security because its canonical security name directly matches this event's themes: month. This is an explainable DERIVED market relationship, not a claim that the security was named in the source article
- FOCT Ft Vest U.S. Equity Buffer Etf - October
Ft Vest U.S. Equity Buffer Etf - October (FOCT) is linked, with no stored direction, medium confidence in the 28 Sep 2026 story “October is historically the most volatile month for stocks. But why? These 4 popular theories fail to hold up..” Reason on file: GA selected FOCT as a RELATED security because its canonical security name directly matches this event's themes: october. This is an explainable DERIVED market relationship, not a claim that the security was named in the source article
- GOCT Ft Vest U.S. Equity Moderate Buffer Etf - October
Ft Vest U.S. Equity Moderate Buffer Etf - October (GOCT) is linked, with no stored direction, medium confidence in the 28 Sep 2026 story “October is historically the most volatile month for stocks. But why? These 4 popular theories fail to hold up..” Reason on file: GA selected GOCT as a RELATED security because its canonical security name directly matches this event's themes: october. This is an explainable DERIVED market relationship, not a claim that the security was named in the source article
Popular (BPOP)
On 28 Sep 2026, “October is historically the most volatile month for stocks. But why? These 4 popular theories fail to hold up.” is the story that connects Popular (BPOP) to this story.
The link for Popular (BPOP) is this: The reported development directly names POPULAR INC in the headline; GA resolved that company to BPOP
A second company, Brookstone Growth Stock Etf (BAMG), is listed for a different reason: GA selected BAMG as a RELATED security because its canonical security name directly matches this event's themes: stocks. This is an explainable DERIVED market relationship, not a claim that the security was named in the source article
The price range for Popular (BPOP), and the dates in the story
BAMG traded between 43.54 and 45.76 across 11 sessions. The latest close on file is 45.02. BAMV traded between 36.14 and 38.33 across 18 sessions. The latest close on file is 36.79. BPOP traded between 152.56 and 162.82 across 20 sessions. The latest close on file is 158.41.
How strong the case is around Popular (BPOP)
46 out of 100
“October is historically the most volatile month for stocks. But why? These 4 popular theories fail to hold up.” scores 46 out of 100. The score uses 1 sources, and 7 linked companies.