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What: Units of American Midstream Partners LP (NYSE:AMID) were down more than 16% in early-morning trading on Thursday. Fueling the fall was the announcement that the company as issuing equity. However, the unit offering is necessary to fund the partnership's planned acquisition of a 25% interest in the Delta House floating production system.

So what: American Midstream Partners announced plans before the market closed yesterday to offer 7.5 million units while also granting underwriters the option to purchase 1.125 million additional units. Those units were priced this morning at $11.31 per unit. However, as the chart below shows, the company is issuing units at a much lower price than recent trading prices, suggesting more dilution than would have been necessary if it had acted a bit quicker.

AMID Chart

AMID data by YCharts.

What's worth noting is that American Midstream Partners' unit price exploded higher the day the initial deal was announced about a month ago, but has drifted lower since that time. In fact, as the chart above indicates, nearly all of the initial deal-fueled gains are gone.

That said, the reason the deal announcement drove such a positive response is that it made its future growth much more visible. This is because the acquisition of the interest in Delta House was expected to drive a 5% boost in the company's distribution to unitholders. It was a move that was lauded by analysts, two of whom promptly upgraded the company.

Now what: Unitholders are a bit disappointed that American Midstream Partners waited until most of the enthusiasm was out of the unit price before issuing equity, leading to a bit more dilution than necessary. However, the acquisition, assuming it does close, will provide more clarity on near-term distribution growth, which was the intention all along.

Matt DiLallo has no position in any stocks mentioned. The Motley Fool has no position in any of the stocks mentioned. Try any of our Foolish newsletter services free for 30 days. We Fools may not all hold the same opinions, but we all believe that considering a diverse range of insights makes us better investors. The Motley Fool has a disclosure policy.