funds are typically not buying on the announcement (since it is not in the
index until the “effective date,” which could be several weeks later). It is a
guarantee that they will be buying the stock, so individual investors and ac-
tively managed funds can begin buying ahead of the announcement. In the
paper “Investor Awareness and Market Segmentation: Evidence from S&P
500 Changes,” the authors, Honghui Chen of the University of Baltimore,
Gregory Noronha of Arizona State University West, and Vijay Singal of Vir-
ginia Tech, analyze the effect of index changes prior to the effective date.
They conclude that, on average, between the announcement date and the
effective date, a stock tends to rise about 5 percent. Deleted stocks, they
say, do not fall as much, the reason being that part of the new buyers of
added stocks are investors who have become newly aware of the stock be-
cause of the addition. Investors do not suddenly become aware of the
deleted stocks, so the effect is less pronounced going into the effective
date although they do note that there is some selloff.
My favorite example of a stock running up into the addition date was
JDSU, which was added to the S&P 500 on July 26, 2000. Many people con-
sidered JDSU to potentially be the next MSFT, a stock with almost infinite
promise and growth potential. Telecom was booming and everyone as-
sumed that the telecom companies would have to buy enough fiber and
components to put fiber directly going into your home. The demand was
thought to be extreme and would last for years. In the months prior to the
addition, posts on the Yahoo! message board for JDSU like the following
were quite common:
What I do to make money is buy and hold QCOM and JDSU (and
others) . . . when they pull back I play options. When JDSU pulled
back from 273 to 210 a few weeks ago, I bought a ton of MAR250
and MAR280 calls . . . I sold some of these the other day for a +250%
profit and bought more JDSU shares for long term with the profits...
and today I bought more. Like I said before, I don’t care if JDSU fol-
lows the entire market down, over the long term it will far outperform
the overall market. By the split in March, I guarantee we’ll be well
over 200. This is how to make money.
Figure 10.1 shows JDSU for the months of July and August, 2000. This
is a classic example of a stock that ran up, in this case more than 40 percent
on high volume as speculators and index funds started buying up the
shares, in the three weeks before addition, culminating in the stock hitting
an all-time high of 140.50 on the effective date of the addition. Buyers of
S&P 500 funds never had it so good again as JDSU began a nonstop fall at
that very point, never hitting 140 again. Within one year, the stock was in
single digits and at the time of this writing, JDSU is at 3.58.
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