The biggest inequality in the talent pipeline isn’t at the top. It’s at the very first promotion to manager where careers either accelerate, or quietly stall.

That’s the central finding from McKinsey’s landmark Women in the Workplace research, and it’s what brought me into a deeply important conversation with Kweilin Ellingrud, senior partner at McKinsey & Company and co-author of The Broken Rung.

This article unpacks the data, the dynamics, and the actions that can change the trajectory for individuals, and for the organizations they work in.

Here are three things you’ll take away from reading this:

  1. Why the first promotion to manager, not the C-suite, is where workplace inequality is actually won or lost
  2. What “experience capital” is, and why it determines half your lifetime earnings
  3. The critical difference between mentorship and sponsorship and which one truly moves careers forward

The Data We Can No Longer Ignore

Here’s what the research shows. For every 100 men promoted to manager, only about 81 women receive the same promotion. Break that down further, and it becomes even starker: roughly 65 Latina women, and only about 54 African American women, are promoted for every 100 men.

Think about that for a moment. Nearly half the rate.

And this isn’t happening at some rarified executive level that affects a handful of people. This is happening at the first step, the transition from entry level to manager, a rung that almost every working person has to climb through.

At entry level, women make up roughly 50% of the workforce. By the time you reach that first management role, it drops to 39%. A nine-point fall. In a single step. Bigger, Kweilin told me, than all other career stages combined.

Over ten years of McKinsey’s Women in the Workplace research, the C-suite has improved by about twelve percentage points for women. And yet at entry level, where 70% of all employees actually sit, progress has been near zero. Often 0%. Sometimes 1% in a good year.

We have spent years with our eyes fixed on the top of the ladder while the first rung has remained broken beneath everyone’s feet.

Three actions from this section:

→ Look at the promotion data in your own organization specifically at the entry-to-manager transition, broken down by gender and ethnicity
→ Don’t benchmark success by C-suite representation alone, track what’s happening at every level of the pipeline
→ Share this data with your team. Awareness is the first step toward accountability

What Is Experience Capital and Why It Changes Everything

One of the most powerful ideas Kweilin introduced is something she calls experience capital.

Experience Capital and Why It Changes Everything

It’s not your degree. It’s not your credentials. It’s all of the skills, knowledge, and wisdom you accumulate on the job through rotations, stretch assignments, solving hard problems in new contexts, leading teams through uncertainty.

And here’s the number that will reframe how you think about your career: half of your lifetime earnings come from experience capital. Not from what you brought to your first job. From what you learn after you get there.

Women are winning the education race by a wide margin. In the United States, women have been earning more college degrees than men for forty years. 59% of degrees today go to women.

And yet that educational achievement isn’t translating into workplace advancement.

Why? Because the other 50%, the experience half, is where the gap lives. When women are blocked at that first promotion, they lose decades of compounding growth. Less access to stretch roles. Fewer rotations. Smaller networks. A lower salary base on which every future raise is calculated.

Miss the first rung, and you don’t just lose a promotion. You lose the platform from which everything else is built.

I think about my own career and how much I benefited from cross-functional exposure. People used to question me for having one foot in consumer, one in industrials, another in innovation. “Choose your lane,” they’d say. But those experiences compounded over time in ways I couldn’t have predicted. They built a network, a perspective, a credibility that no single career path would have given me. Early in my career, studying how networks actually work, weak ties, strong ties, open and closed networks, shaped the choices I made, even when I wasn’t fully conscious of it. Kweilin’s research is a reminder that we need to be far more intentional about this, and far earlier.

Three actions from this section:
→ Identify one cross-functional rotation, stretch project, or new skill area you can pursue in the next 90 days
→ If you lead a team, look at who has been in the same function for more than two years and open a conversation about how to stretch their experience
→ Reframe how you evaluate career progress: credentials get you in the door, but experience capital determines how far you go

Mentors Give Advice. Sponsors Change Careers.

We celebrate mentorship. We build programs around it. Well-intentioned, much of it genuinely helpful. But Kweilin was direct: mentors, in and of themselves, don’t change careers.

Sponsors do.

A sponsor is someone who creates an opportunity for you that wouldn’t have existed otherwise. A promotion you weren’t yet being considered for. A high-visibility project that gets you in front of the right people. A moment in a room where someone says your name with conviction and opens a door.

70% of job openings are never publicly posted. If you don’t have a sponsor in that room, those opportunities simply don’t find you.

And yet women, the data shows, are consistently over-mentored and under-sponsored. Plenty of advice. Not enough advocacy.

Kweilin’s own approach is instructive. She typically maintains two active sponsors at any given time close enough to be genuine mutual commitments, diverse enough not to have all her eggs in one basket. And she’s equally intentional on the giving side, creating opportunities for others across her organization.

This is what systemic change looks like in practice: not waiting for the institution to fix itself, but each of us taking responsibility for the people around us.

Three actions from this section:
→ Ask yourself: who are your one or two sponsors right now? If you can’t name them, that’s the gap to close first. If you do have sponsors, be direct with them about what you need. They are invested in your success, but they won’t always know where to focus unless you tell them.
→ Think about who you are actively sponsoring, not mentoring, but creating real opportunities for
→ In your next one-on-one with a direct report, ask: “Is there an opportunity I can create for you in the next quarter?”

Networks: The Career Debt Nobody Talks About

Women’s professional networks are, on average, 14 to 38% weaker than men’s. Kweilin measures network strength in three ways: 1) the quantity of relationships, 2) the quality of the ties, and 3) the openness, meaning, what percentage of your network exists outside your current organization.

The Career Debt Nobody Talks About

The real test of a strong network? Could it sustain a job change?

For many of us, the honest answer is no.

Part of the challenge is a hesitation to blend personal and professional relationships. Women are far more likely to keep the two separate, to wonder whether a friendship is genuine or merely convenient. And there is also a structural problem that compounds this. Women are five times more likely to have a network made up almost entirely of other women. Given that only about 30% of people who report directly to a CEO are women, a predominantly female network is, by definition, more narrow and more junior and the senior women within it are often stretched far beyond what they can sustain in terms of sponsorship.

The solution isn’t to abandon those relationships. It’s to diversify intentionally. Different levels. Different functions. Different genders. Inside and outside the organization.

Kweilin’s practical suggestion:
→ Block two hours per week for network-building, protect the time even if you shift it around
→ Go into each conversation with a specific goal: a skill to learn, an area to explore, a perspective to understand
→ Always leave with a name: “Who else should I meet?”

I’d add something from the Harvard Flourishing Study that sits at the heart of my own work: the quality of your relationships is the single greatest predictor of your long-term success and wellbeing. Not your IQ. Not your credentials. Your relationships. Building them isn’t a lesser priority. It is the priority.

What Leaders Can Do Starting Today

The broken rung isn’t only a personal problem. It’s a leadership problem.

Kweilin shared a story that has stayed with me. One CEO in financial services created a sponsorship cascade: he personally sponsored five diverse leaders at the C-suite level. Each of those five sponsored five more. Those twenty-five each sponsored five people at the next level. Formal and informal connection events were woven in to strengthen bonds and surface anyone who was falling through the cracks.

The result wasn’t a diversity program. It was a culture shift built on the belief that opportunity creation is a leadership responsibility, not a human resources initiative.

And the research behind all of this gives us something valuable: not a list of problems to despair over, but a precise set of levers to pull. The data is clear. The actions are knowable. What it takes now is the decision to act.

Three actions from this section:
→ Ask each person on your team: “Who is your sponsor?” If they can’t name one, that is your action item, today
→ Design at least one cross-functional stretch opportunity this quarter for someone on your team who hasn’t had one
→ Consider building a sponsorship cascade in your organization, it doesn’t require a formal program, just deliberate intention at every level of leadership

The Rung We All Have to Climb

Whether you are early in your career or leading a team of hundreds, you have a role in this.

Pick the right company, one that invests in your growth, supports rotations, and has a clear strategy. Build your network with intention, not as an afterthought. Find sponsors and be one. Signal your value clearly, specifically, and often.

And if you lead people, start with the question that costs nothing and changes everything:

Who on your team doesn’t have a sponsor yet?

That’s where you start.

This article was inspired by my conversation with Kweilin Ellingrud on the Flourishing Edge podcast. Kweilin is a senior partner at McKinsey & Company and co-author of The Broken Rung.

Learn more about Kweilin Ellingrud on LinkedIn.

Listen to the podcast with Ashish and Kweilin Ellingrud below, You can also listen on Apple Podcasts.

Access and subscribe to all of the episodes of the Flourishing Edge Podcast here.

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