https://www.reuters.com/article/us-column-insidertrading-saf...
KID TRADERS
Using data on a half a million accounts from Finland from
1995 to 2010, the study came to a surprising conclusion:
accounts set up to benefit kids 10 years and under did
really well at stock picking, and did especially well just
before mergers, earnings releases and events that generate
big stock moves.
The analysis was possible since Finland makes available
unusually detailed information about the identities of
investors.
“When guardians trade through under-aged accounts, there
is a relatively high probability that they are trading on
private information,” the authors, Henk Berkman, at
University of Auckland, Paul Koch at the University of
Kansas and Joakim Westerholm at the University of Sydney,
conclude in a paper slated to be published in the Journal
of Finance.
The gap between the junior set and typical accounts held
by adults was striking: in the day following trades made
by kids, their accounts outperformed the adult accounts by
9 basis points.
Ahead of major earnings announcements, the kids chose
correctly whether to buy or sell 57 percent of the time
and beat their elders by 1.1 percent in the following day.
It gets even better - at least for junior. On trades made
the day ahead of a merger announcement, juvenile
portfolios outperformed by 12 percent the following day,
and made the right decision to buy or sell an uncanny 72
percent of the time.
The rest of the market, by the way, chose correctly
whether to buy or sell only 50 percent of the time.
This is probably not all due to inside knowledge,
according to the study. The guardians tended to be richer
and may simply have been more successful at investing, the
authors argue, due perhaps to higher intelligence or an
advantage in obtaining legal, but valuable information.
Even so, the fact that the juvenile accounts outperformed
ahead of mergers while the guardians’ accounts did not
implies that the adults were smart enough to know better
than to trade on inside knowledge in an easily traceable
way.