Addition of a Stock to S&P Index leads to increase in its price within minutes of Announcement and continues to increase during the next day
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Why Timing Matters
Our analysis of 750+ historical S&P index additions shows that stock prices react quickly following an addition announcement.
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Designed to alert you within minutes after an addition is announced, so you don't have to continuously monitor S&P announcements
Historical price reactions do not predict future performance. BestStockInsight provides information and alerts, not individualized investment advice.
Historical Research Summary
S&P Index Additions Historically Showed an Average 3.8%(approximately) Price Increase Within One Day of Announcement
Based on our analysis of 779 additions from September 2018 through July 2025: Using closing price immediately preceding the announcement to the next trading day's closing price
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Average return by the next trading day's close: +3.8% (Approx)
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Median return by the next trading day's close: +3.5% (Approx)
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Of the 779 observations:
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586 (75.2%) increased
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172 (22.1%) decreased
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21 (2.7%) were unchanged
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About 75% of the observations were positive. In other words, approximately 3 out of 4 S&P index additions in the dataset had a positive return by the next trading day's close.
Statistic | Data |
|---|---|
Valid observations | 779 |
Average return | +3.80% |
Median return | +3.53% |
Standard deviation | 5.73% |
25th percentile | +0.03% |
75th percentile | +6.94% |
10th percentile | −2.62% |
90th percentile | +10.40% |
5th percentile | −4.78% |
95th percentile | +14.13% |
Minimum | −16.19% |
Maximum | +24.69% |
Positive returns | 586 / 779 = 75.2% |
Negative returns | 172 / 779 = 22.1% |
Exactly zero | 21 / 779 = 2.7% |
How it Works ?
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We monitor new additions to S&P indexes made by S&P Global. The announcements are made at or immediately after 5:15 PM EST
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We detect the announcement within seconds and send a Phone call alert and email to subscribers. Subscribers get a call from our dedicated number for making the automated calls.
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You should store the number, so that you immediately identify that the call is from “S&P Index Addition Alert - For Best Stock Insight Subscribers”
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The subscriber in the image here got the alert at 4:17 PM CST-within about 3 minutes of the Index addition
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Subscribers also get an email, with a link to the S&P global announcement.
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Check your email immediately & open the link. Identify the stocks added to the S&P 500 ( or other indexes).
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Place your trade, subsequently.
01
Coinbase(COIN): Stock Price increased by 25% by End of Next Day, after announcement to add to S&P500 Index
On 12th May, 2025, Coinbase stock was added to the S&P 500 Index.
Within a few minutes of the announcement that the stock will be added to the S&P 500 Index, the price of the stock increased.
By the close of the after-market trading at 8pm EST, the “closing price” of Coinbase(COIN) stock increased by about 7%.
By the Next Day Open, the “closing price” of Coinbase(COIN) stock increased by 10% above the “close price on announcement day” .
By the Next Day close of the after-market trading at 8pm EST, the “closing price” of Coinbase(COIN) stock increased by about 20%.
Above chart shows the price changes, minutes after the announcement.
Chart 01: CoinBase
02
Bunge (BG): Stock gave a return of about 7% to 9% in one day, if bought within 5 minutes of announcement to add to S&P500
Buying the Bunge(BG) stock within about 5 minutes of the “announcement to add to S&P 500” gave a return of about 7% to 9%, for a holding period of about one-day (depending on the time of selling).
On 13th March, 2023, Bunge(BG) stock was added to the S&P 500 Index.
Within a few (about 5) minutes of the announcement that the stock will be added to the S&P 500 Index, the price of the stock increased by about 5%.
By the close of the after-market trading at 8pm EST, the “closing price” of Bunge(BG) stock increased by about 7.8% above the "Open Price" at time of announcement
By the Next Day Market Open, the “closing price” of Bunge(BG) stock increased by 8.4 % above the "Open Price" at time of announcement.
By the Next Day close of the after-market trading at 8pm EST, the “closing price” of Bunge(BG) stock increased by 12% above the "Open Price" at time of announcement.
The maximum price during the next day was about 14% above the "Open Price" at time of announcement.
The above graph shows the price changes, minutes after the announcement.
Chart 02: Bunge(BG)
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Within minutes of announcement to add a stock to S&P Index
Get a phone call & email of stock(s) that were added
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Paid Subscriber
I have been a subscriber of the stock alerts from beststockinsight.com since early 2025. I started with a 2000$ positions in stocks when they were added to S&P indexes. I kept watching and learning more about the behavior of these stocks. As I gained confidence in this strategy, I gradually increased my position size, as I saw the profits ( and some occasional losses). I went through the research posted on beststockinsight.com and also did my own research. My best position was Coinbase, where I made a profit of more than $18,000 in one day, after buying the stock on getting the Announcement alert on 12th May 2025
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"I have been a user of the beststockinsight.com alerts for about four months. I definitely like the fact that I get a notification before it is widely available on news media. My brokerage account (fidelity, Schwab) do not provide such a notification on phone. I have made more than $5000 in profits by using these alerts to buy stocks that were added to S&P500. The cost of the subscription is way less than the value it provides."