and Amazon.com Inc. have stolen away two of the best-known producers in Los Angeles, further underscoring the shifting power dynamics in a business long controlled by a handful of large players.

Shonda Rhimes, the iconic television producer responsible for many of ABC’s biggest shows, announced over the weekend that her production company, Shondaland, is leaving Walt Disney Co.

for Netflix, a rare setback for the world’s largest entertainment company. Just days earlier, Amazon announced that it had signed well-respected producer Robert Kirkman, creator of the gigantic hit “The Walking Dead,” to cut his long-term development ties to AMC Networks Inc.

Taken together, the dual departures may signal a landmark shift in Hollywood’s control over the biggest talent as streaming services flex their muscles in a market long dominated by the five major studios and a handful of smaller ones.

“This means it’s all-out war in this game to attract and to hold the top storytellers,” said Peter Csathy, founder of Los Angeles-based media tech business advisory firm CREATV Media. “Disney is massive but so [are] Netflix, Amazon and Apple, and you have all of these behemoths competing for a relatively small group of talent with both the name and the proven mass-track record.”

Netflix’s signing of Rhimes comes less than a week after Disney announced plans to launch a subscription-based video streaming service for ESPN, its all-purpose sports channel, and another service for its movies and television shows. As part of creating a Disney-branded general entertainment streaming platform, the company on Aug. 8 said it would terminate an extensive movie licencing deal with Netflix by 2019. New films from Disney studios and Pixar such as “Frozen 2” and “Toy Story 4,” scheduled for 2019, will run on the new streaming service, the company said.

Yet by persuading Rhimes to leave Disney’s ABC after more than a decade there, Netflix has struck back, securing the services of one of the industry’s most successful creators of mainstream TV serials in recent years. As part of a multiyear contract, Rhimes’ Shondaland, which created hits such as “How to Get Away with Murder,” “Grey’s Anatomy” and “Scandal,” will make new shows for Netflix.

Securing Rhimes’ services underscores Netflix’s strategy to invest billions of dollars in new original content, lessening its reliance on Disney or any other content producer. Earlier this month, Netflix made its first-ever acquisition, buying Millarworld, producer of a variety of comic book characters that it said would be used to develop TV serials and movies.

Already benefiting from a large reservoir of newer TV serials such as “The Crown” and “Narcos,” Netflix is expected to spend more than $6 billion in 2017 on even more content that it will own. Not even Disney will spend that much money this year on original TV and movie serials, CEO Bob Iger said a week ago.

“Money will get people to change allegiances, and for Disney and AMC, this means they’ll have to be much more competitive,” said Ezra Kucharz, a New York-based media consultant and former adviser to CBS Corp. CEO Leslie Moonves. “Netflix and Amazon are looking to lock up top talent for their platforms, and you’ll see more of this.”

Amazon is taking similar steps.

By signing a deal with Kirkman, Amazon will have first access to new productions from his Skybound Entertainment studio. It was Kirkman’s comic book characters that led to the development of “The Walking Dead,” the top-ranked TV serial that will begin its eighth season next month. The show about zombies, and its various spin-offs, will remain at AMC.

Amazon’s decision to target Kirkman fits with its own strategy of cultivating a stable of high-profile films and TV serials rather than looking to develop dozens of them as Netflix is doing. Unlike Netflix, which produces a variety of content to grow and retain monthly subscribers, Amazon is focused on developing shows with the potential to grab headlines and secure subscribers to its Prime Video service, available only to members of Amazon Prime, which costs US$99 per year and provides discounts on shipping most items purchased at its website.

Amazon won wide acclaim in 2015 for “Transparent” when the show became the first online series to win a Golden Globe award for best series – it took the honours in the musical or comedy category. Earlier this year, the Amazon-produced “Manchester by the Sea” won Oscars for its screenplay and best actor (Casey Affleck). More recently, Amazon grabbed audiences for the Grateful Dead documentary “Long Strange Trip.”

“These companies that we’ve always thought of as technology companies are fast becoming entertainment companies,” said Jason Squire, a film professor at the University of southern California’s School of Cinematic Arts and editor of “The Movie Business Book.” He continued, “These Web-based tech companies saw the opportunity to further engage with their customer base through entertainment, and for the most part, they’re succeeding.”