The answer is none. Plenty of large vertebrates are endangered and even critically endangered, such as Siberian tigers and Sumatran orangutans. And species are going extinct all the time, but they're mostly plants, invertebrate animals or small animals - toads, snakes, moths, birds.
But now the baiji, the Yangtze river dolphin, is probably extinct. There used to be thousands of this unique species in the Yangtze river in China, but pollution and river management led to a decline in its numbers. The last one was sighted in 2004, and a recent survey failed to find any at all.
All life is connected, so the extinction of the Essex emerald moth is just as important as the gentle baiji. But it should give us a wake-up call to think that we humans have driven this animal out of existence.