oops, correction 62000 Oct open interest in 122 puts. However you did get me looking and I noticed the price of the puts and calls appears to be heavily weighted in favor of puts. For instance, the Oct 122 puts are bid at .93 which is $2.22 away from the closing price. While the 126 calls (only $1.78 from closing price) is bid at only .84 ! All future contracts appear to be similarly priced indicating that the market is anticipating downside likelihood.
We will know the open interest on the 124 put contract on Monday but I'm sure it will be close to 30,000. Treasuries were marked up this week for end of quarter so that the seniors didn't see a big loss.