Get Alerts When Stocks Are Added to the S&P 500
Get a phone call + email within minutes when S&P announces a stock addition to the S&P 500, S&P MidCap 400 or S&P SmallCap 600.
779 historical S&P index additions analyzed
+3.8% average next-day return · +3.5% median return · 75% positive
September 2018–July 2025. Measured from the pre-announcement market close to the next trading day's close.
No stock picks. No predictions. You decide what to do with the information.
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.
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Standard Deviation is: 5.73 % ; Range is: −16.19% to +24.69%. So the 3.8% average should not be interpreted as “stocks usually gain about 3.8%.” Individual outcomes vary considerably.
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The middle 50% of observations—the interquartile range—runs approximately from: +0.03% to +6.94%
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.
Why Timing Matters ?
S&P index-addition announcements can move stock prices quickly—sometimes within minutes of the announcement.
Many S&P index changes are not announced on dates known in advance, making it difficult for an individual investor to continuously monitor for new announcements.
That is why timely notification matters. When an S&P 500, S&P MidCap 400 or S&P SmallCap 600 addition is announced, receiving the information quickly gives subscribers more time to evaluate the announcement and decide whether to act.
Our historical analysis illustrates how quickly these price movements can occur. Across 779 S&P index additions from September 2018 through July 2025, stocks increased by an average of approximately 3.8% from the regular-market close immediately preceding the announcement to the next trading day's close. Approximately 75% of the observations had a positive return over this period.
Coinbase (COIN) provides a notable example. Following the announcement of its addition to the S&P 500, COIN was approximately 7% above its pre-announcement closing price by the end of after-hours trading that evening, and approximately 25% higher by the end of after-hours trading the following day. (See the Coinbase chart below.)
BestStockInsight is designed to shorten the time between an S&P index-addition announcement and when you learn about it—so you can evaluate the information and make your own investment decision.
We alert you when the addition is announced. You decide what to do with the information.
Real Addition Examples
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)
“I received the Coinbase S&P 500 addition alert on May 12, bought COIN, and made more than $18,000 (~18%) in one day. It was my best trade using the alerts.”
— Paid Subscriber (Name withheld for privacy)
Individual subscriber experience. Results vary. Past performance does not predict future results.
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S&P Index Addition Alert Example: AXTI
BestStockInsight provides alerts for stocks announced for addition to the S&P 500, S&P MidCap 400 and S&P SmallCap 600. The AXTI trade below is a subscriber example following an S&P SmallCap 600 addition announcement on 4th September 2026
“I received the BestStockInsight alert when AXTI was announced for addition to the S&P SmallCap 600. After reviewing the stocks included in the S&P index changes, I decided to buy AXTI shortly after the announcement.
My limit order was executed at 6:17 PM ET, about an hour after the announcement, and I sold the position the next trading day for approximately a 7% profit.
What stood out to me was that AXTI was an S&P SmallCap 600 addition—not an S&P 500 addition. I now pay attention to stocks added across the S&P 500, S&P MidCap 400 and S&P SmallCap 600.”
— BestStockInsight Subscriber
Note about this S&P index addition: AXTI was announced for addition to the S&P SmallCap 600 on September 4, 2026. The subscriber's AXTI buy order was executed at 6:17 PM ET following the announcement and the position was sold the next trading day for an approximately 7% profit
Read the full testimonial → Testimonials
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Monthly Plan (First 30-day Free Trial)
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Subscribe to monthly plan for real-time alerts when a stock gets added to S&P Index.
Within minutes of the announcement to add a stock to S&P Index, get a call & email of stock(s) that were added.
Valid until canceled
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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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Every year
Subscribe to yearly plan for real-time alerts when a stock gets added to S&P Index.
Within minutes of the announcement to add a stock to S&P Index, get a call & email of stock(s) that were added.
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This is 33% discounted from our monthly plan
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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