The big insider news from Thursday came in a Form 4 filing by RA Capital Management.

The firm reported a purchase of 2,200,000 shares of Nkarta Inc $NKTX, representing an ownership stake of 23%.

The largest insider transaction on today's list is a Form 4 filing by Simon Groom, who reported a $49 million purchase in the broadcasting company iHeartMedia $IHRT.

The largest insider transaction on today's Hot List is a Form 4 filing by Ernest Garcia II, CEO and co-founder of Carvana $CVNA.

CVNA just raised an additional $1 billion via a private offering of perpetual preferred stock, and Garcia has taken a large allocation.

He remains CVNA’s largest shareholder by a wide margin.

It’s been just over three weeks since Elon Musk filed his original 13G and revealed an investment in Twitter $TWTR.

Now, it looks like he’s about to take control of the entire company.

Yesterday, it was announced that Twitter has accepted his $44 billion offer to take over the company and go private.

Here’s what else is happening in the world of insider activity…

This morning, the big market news is that Twitter $TWTR and Elon Musk are getting close to striking a deal for the eccentric billionaire to take the company private.

This is a dramatic turn of events from just last week, when the company announced it had adopted a “poison pill” to ward off Musk’s takeover efforts.

The latest reports suggest a deal could be finalized as early as today.

The largest insider buy on today's list is a Form 4 filing by Jan Barta of Pale Fire Capital.

Barta now owns 2,658,550 shares of Groupon $GRPN, which represents an ownership stake of approximately 9%.

In the activist world, Bill Ackman announced that Pershing Square exited its position in Netflix $NFLX, as the stock was plunging lower by 35% on the heels of a disappointing earnings report.

It’s estimated that the hedge fund lost over $400 million on the position, which was just purchased back in January.

The only insider buy on today's Hot List is a Form 4 filing by the CEO of Solo Brands $DTC, who reported a purchase of roughly $486,200.

In the options market, there was bullish options activity in the social media platform Pinterest Inc $PINS and in the retail pharmacy operator Walgreens Boots Alliance Inc.

Today’s Hot List is a short one.

Durable Capital Partners continues to build its position in the language-learning website and mobile app Duolingo Inc $DUOL.

We’ll lead off today with an update on the big activist story we’re all paying attention to.

After meeting last week to discuss Elon Musk’s takeover offer, Twitter’s $TWTR board announced the adoption of a “poison pill” that makes it economically untenable for Musk to acquire more than 15% of outstanding shares.

It’s also being rumored that Musk is considering taking on partners for his bid for the company.

In a letter to the board of directors, Elon Musk has made an unsolicited bid to buy 100% of Twitter $TWTR in an all-cash deal.

He’s offering $54.20 per share, which represents a 54% premium from when he began investing in the stock and a 38% premium from the time it was announced.

The largest insider transaction on today’s list is a Form 4 filing by Jan Barta of Pale Fire Capital.

Barta continues to grow his position in Groupon $GRPN, as this is the second large Form 4 filing in the last two weeks.