quarterly rebalancing is normal
Leap1: Mark is asking why could out of stocks when they have gone down more than bonds? Why not put more money into stocks?
MarkR: Exactly.
If a 60/40 fund rebalances quarterly, the question is, how have things changed since end of Q3? That will determine how they rebalance in late December for the end of Q4.
30th September $BND (Vanguard total bond fund): $71.33
today, $BND: $73.69
→ Bonds have gained 3.3% since end of quarter Q3 2022.
30th September $SPY: $357.18
today, $SPY: $383.27
→ Stocks have gained 7.3% since end of quarter Q3 2022.
Therefore, as things stand presently, stocks in a quarterly rebalancing 60/40 fund will need to be sold and bonds will need to be bought, to rebalance to 60/40.
OK, well, what about once-annually-rebalancing 60/40 funds?
$SPY, 31/12/21 was $474.96
$SPY, today is $383.27
→ Therefore the SP500 is down 19.3%
$BND 31/12/21 was $84.75
$BND, today is $73.69
—> Therefore, bonds are down 13.0%
For that type of fund, they’ll be moving from bonds to stocks.
The effects may cancel out. However, I looked up to see when Vanguard rebalance their 60/40 funds and found this interesting reply:
https://theinquiringinvestor.com/2012/06/03/how-often-do-vanguard-target-date-funds-rebalance/
After reviewing the fund’s prospectus, I decided to give Vanguard a call directly using their customer service line and ended up speaking with a representative named Robert.
Robert’s response to this was interesting – although in retrospect unsurprising. He said that Vanguard does not release that information because of the potential for abuse. If it was public knowledge that Vanguard rebalanced its funds on certain dates, then traders could take advantage of that fact by manipulating the price of the underlying funds that the VFIFX would have to buy in order to rebalance (In this case, VFIFX has 3 underlying funds: the Vanguard total stock market index, the Vanguard total international stock market index, and the Vanguard total bond index).
Then I looked up what Jack Bogle’s personal take was on rebalancing frequency for savings in bonds/stocks:
https://www.cnbc.com/2015/10/14/jack-bogle-follow-these-4-investing-rules-ignore-the-rest.html
“If you want to do it, once a year is probably enough,” he said.
On the other hand, the SP500 famously rebalances quarterly, as do many equity ETFs with Vanguard and iShares. However it rebalances on the third Friday each quarter.
https://www.nasdaq.com/articles/ishares-investigates%3A-the-cost-of-equity-index-rebalances
for example, the S&P 500 Index has been rebalancing quarterly since 1957
Conclusion: who knows?