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Worried Big IPOs Will Tank the Market? Here’s Why You Probably Don’t Need To Be

If you’ve been keeping an eye on the news lately, you’ve probably noticed all the hype around some huge IPOs this year. It’s not just the Wall Street crowd getting antsy—regular investors are concerned too, worried about a repeat of the infamous “Dotcom Bubble” days when a flood of new listings seemed to suck the life out of the broader market. I’ve had more than a few clients ask me, “Will these big IPOs crash my portfolio?”

That’s a fair question. When giants like Instacart, Reddit, or Stripe hit the public markets, trading buzz surges and the headlines get loud. Historically, some folks have worried that these mega-IPOs pull liquidity away from existing stocks, dragging indexes down with them. But is that really what happens? Spoiler alert: it’s not so straightforward.

The IPO “Siphon” Theory — And Why It Doesn’t Tell the Whole Story

The main worry goes like this: investors chase hot IPOs, selling their other stocks to free up cash, which weakens the overall market. I hear this theory a lot, especially when new tech darlings debut. But if you dig into the numbers, it’s not quite that simple.

First off, not every IPO is a market-mover. It’s pretty rare that a single offering—even a big one—can gobble up enough capital to shake broad indexes like the S&P 500. Even when you stack several IPOs together, their total size usually pales in comparison to daily trading volumes.

Take the 2020–2021 IPO boom: U.S. markets handled hundreds of billions in fresh stock issuance, yet the S&P 500 kept climbing. Here’s the key point—IPO proceeds don’t vanish into thin air. The money raised goes to the company or early investors, who often plow it back into the economy. So, capital isn’t disappearing; it’s just moving around behind the scenes.

Who Actually Buys These IPOs?

There’s a common image of every investor scrambling to jump on flashy IPOs right at launch. The truth? Most early IPO shares go to big institutional players—think mutual funds, hedge funds, pension funds—not everyday retail investors. Regular folks usually get access later, if at all, once the initial excitement settles.

This means the idea that millions of retail investors are dumping their portfolios to chase IPOs is mostly a myth. The market’s liquidity pool is deeper and more resilient than many realize. From what I’ve seen, most retail investors tend to avoid IPOs because of their rollercoaster volatility and the risk of getting burned (remember the Robinhood or Deliveroo debuts in 2021?).

What Really Moves the Market?

The big picture is that macro factors have way more influence: interest rates, inflation, earnings reports—they’re the real market movers. IPOs are more like the side show. Even when a hyped IPO stumbles (hello, WeWork), it rarely has enough oomph to tank the entire market.

Look at 2023. Despite all the buzz about big IPOs flooding the market, the S&P 500 hit new highs. Why? The Federal Reserve paused rate hikes, tech earnings beat expectations, and consumer spending stayed solid. IPOs grabbed headlines, sure, but they didn’t derail the rally.

When Could IPOs Actually Shake Things Up?

That’s not to say IPOs never matter. In certain spots, the “IPO drain” concern can play out. For example, if a mega-IPO drops during a low-liquidity stretch (think late summer, when trading thins out), it might create some short-term turbulence. Similarly, in shaky markets—like March 2020 or late 2008—a badly timed IPO might spook investors.

There’s also a psychological angle. Sometimes, a flood of IPOs signals frothy market conditions. Remember the late 1990s, when speculative IPOs with little revenue were everywhere? That bubble mentality made investors jittery, and when sentiment shifted, IPOs helped fuel the sell-off. But that’s more about mood swings than the actual IPO mechanics.

Why a Healthy IPO Scene Is Actually a Good Sign

Here’s something that often gets overlooked: a busy IPO calendar usually means investors are confident. When private companies take the plunge and go public, it’s because folks believe in their growth story. It’s like a release valve for pent-up capital and innovation. Most teams find it hard to believe that a strong IPO pipeline is a bad thing. Usually, it’s a sign that the market is working as it should.

I’ve seen plenty of times when waves of IPOs coincided with bull markets, not crashes. The trick? Focus on quality over quantity. A flood of speculative, unprofitable companies is a red flag. But when a handful of large, profitable firms come public, it’s a pretty clear vote of confidence in the economy.

Some Things to Watch Out For

That said, not every IPO season ends well. If you find investors chasing every company with “.ai” in the name, it’s time to step back. Euphoria can cloud judgment, and I’ve seen plenty of people jump into IPOs out of FOMO (fear of missing out), only to regret it when the excitement fades.

Also, the broader market environment matters. IPOs launched during tightening monetary policy or recession jitters tend to struggle, even if the companies themselves are strong. Investors hoping for a quick flip can get burned when sentiment turns sour. The market mood can change fast.

The Bottom Line: Don’t Pin Your Market Woes on IPOs

It’s easy to see every big IPO as a threat to your portfolio. But most of that worry is overblown. The market is huge and usually absorbs new listings better than you’d expect. In reality, it’s macroeconomic forces and investor psychology—not IPOs themselves—that spark major market moves.

My advice? Keep your focus on quality, watch for signs of froth, and don’t let IPO headlines dictate your long-term game plan. In most cases, the market just shrugs off even the flashiest debuts. If you’re looking for real risk, look beyond the IPO calendar and zero in on the fundamentals.

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