Yet another couple of high-ranking employees at the beleaguered social media company are reportedly spreading their wings and flying away — this time, it s Jana Messerschmidt, the head of business development, and Nathan Hubbard, head of media and commerce.

Still, Messerschmidt and Hubbard s decisions constitute the most significant personnel news to emerge since four Twitter VPs left the company back in January.

Messerschmidt, whose six-year tenure at Twitter made her one of the few remaining executives who could recall the pre-IPO time period at the firm, has played a key role in developing Twitter s partnerships with major names like IBM, Salesforce, and Google.

And as for Hubbard, who was the CEO of Ticketmaster before he joined Dorsey s team, sources say that the tech veteran is looking to start a company of his own.

1 A tweetstorm on why I joined Twitter, why I love Twitter, and why I've decided to leave Twitter next month:

— Nathan Hubbard @NathanCHubbard May 26, 2016

In a series of tweets, Hubbard explained the thought process behind his departure, tweeting, There are no words to express the gratitude I feel to the human beings I got to connect with at Twitter, colleagues present and past.

While it is unclear as to what Twitter s long-term plans are for the newly vacated positions, for the time being, Messerschmidt and Hubbard s positions will be rolled into the responsibilities of Ali Jafari, who currently heads revenue in business development.

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