There are also the grain ship and the Rubymar (UK registered, Belize flagged, carrying fertilizer to Bulgaria, IIRC), but apparently several Indian-connected ships (with nothing to do with Israel) have been targeted. In fact, the Indian response has been second only to the US. However, it appears none of the parties defending (US, UK, India, Japan, France) are in any kind of formal or overall cooperation. There HAS been cooperation at some particular incidents cooperation, however.
Not to worry, the Iranian ship tagging the targets is back on duty after being shut down by a U.S. cyber attack. All I can say is don’t pay for protection on your ships if you don’t feel it’s worth it. It’ll be up to the other ship owners to make their own decisions as well.