Let me share a few things I know about HOSIX.
1) The Sharpe ratio is unusually high partly due to structural design. First, since it is a mutual fund rather than an ETF, you can always buy and sell it at its NAV with the downside that this happens once a day.
Second, and this is the unusual part, it trades with accrued interest. What the heck does this mean? It means if you buy it, you start getting accrued interest from the date of purchase to the next distribution and when you sell it you get a final accrued distribution on the next distribution date after the sale. This is also called "trading flat" and it tends to keep the NAV unchanged other than for changes in the value of underlying securities.
Together these two structural components give rise to amazingly low volatility and a high Sharpe ratio but they are driven more by the math than the PM's skill (which is very good IMO).
2) The company behind HOSIX, Holbrook holdings is a rather small team. The good part is they are approachable and I have contacted them including the HOSIX PM and they readily reply by email. The not so good part is they produce bare bones data on their web site, so it's difficult to get information that way. In particular they update their distribution data with a much greater lag than you find on M#.
Bottom line - I have invested in HOSIX in the past with good result. However, I switched to EGRIX for higher return with higher volatility. Since EGRIX has faltered recently (see my earlier post #989) I have trimmed back on EGRIX and rather than take the safer route with HOSIX, I have moved a portion of EGRIX to QMHNX and QRPNX for higher return with higher volatility.
I will probably keep the allocations this way until the Iran war truly ends at which time I will reevaluate. While I sold my QLENX position and a small ORR position, I keep these on my watch list to see if they will begin to recover after the war.