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Operator
Ladies and gentlemen, thank you for standing by and welcome to this morning's Belden Incorporated conference call. (Operator Instructions). I would now like to turn the conference over to Matt Tractenberg. Go ahead, sir.
Matt Tractenberg - VP of IR
Thank you, Anthony. Good morning, everyone. Thank you for joining us today for Belden's first quarter 2016 earnings conference call. My name is Matt Tractenberg, I'm Belden's Vice President of Investor Relations. With me here this morning are John Stroup, our President and CEO, and Henk Derksen, Belden's CFO. John will provide a strategic overview of our business, and then Henk will provide a detailed review of our financial and operating results followed by Q and A. We issued our earnings release earlier this morning and we prepared a slide presentation that we'll reference on this call.
The press release, presentation and transcript of these prepared remarks are currently available online at investor.belden.com. Turning to slide 2 in the presentation. During this call management will make certain forward-looking statements. I would like to remind you that any forward-looking information we provide is given in reliance upon the Safe Harbors provisions of the Private Securities Litigation Reform Act of the 1995.
The comments we will make today are management's best judgement based on information currently available. Actual results could differ materially from any forward-looking statements that we make and the Company disclaims any obligation to update this information to reflect future developments after this call. For a more complete discussion of factors that could have an impact on the Company's actual results, please review today's press release and our annual report on Form 10-K.
Additionally, during today's call management will reference adjusted or non-GAAP financial information. In accordance with Regulation G we have provided a reconciliation of the most closely associated GAAP financial information to the non-GAAP financial information we communicate. This reconciliation is in the appendix of the presentation and has been posted separately in the Investor Relations section of our website.
I'll now turn the call over to our President and CEO, John Stroup. John?
John Stroup - President, CEO
Thank you, Matt, and good morning, everyone. As a reminder I will be referring to adjusted results today. Please turn to slide 3 in our presentation for a review of our first quarter highlights. We are extremely pleased with our first quarter results including earnings growth, margin expansion and cash flow. This allowed us to pay down an additional $51 million of debt, further reducing our leverage.
Debt reduction continues to be a priority this year and we're on track to deliver approximately three times net debt to EBITDA in 2016. As expected, strength within our broadband, enterprise and network security markets offset weakness from our industrial platform. Despite at difficult year-over-year comparison due primarily to lower oil prices and a stronger US dollar, our attractive portfolio, superior business system and talented team, enabled us to outperform.
I would like to thank our associates for their hard work during the quarter and their commitment to aggressively executing our strategic plan. Overall, the business is off to a solid start for the year with revenues in the first quarter totaling $543.8 million. After adjusting for changes in copper and currency, revenues declined organically by 1%. We're encouraged by a consolidated book-to-bill above one with industrial orders consistent with seasonal patterns. Year-over-year revenues for the combined industrial platforms declined by 5.8% in line with both expectations and peer results.
Our broadband connectivity business and enterprise and network security platforms delivered solid growth within the quarter. Gross profit margins were 42.3% for the first quarter an increase of 170 bases points from the year ago period. I'm also pleased with our EBITDA margins in the first quarter as 16.4%, a year-over-year increase of 90 bases points. Free cash flow in the period improved by almost $63 million from the prior year. I believe this is a great indicator of our commitment to operational excellence and our commitment to reducing financial leverage.
Earnings per diluted share was $1.01 in the first quarter which both exceeded our own estimates and grew slightly from the year ago period. As a result of this strong start to the year we have increased our full year revenue and EPS guidance. Please turn to slide 4 for a review of our business segment results. To capitalize on the adoption IP technology and accelerate our penetration of the commercial audio video market, we elected to transfer the responsibility of this product category to our enterprise segment leadership team.
As a result, audio video cable and connector revenue will now be recognized within the enterprise connectivity platform. It was previously recorded within the broadcast solutions platform. Prior period segment information has been revised to conform to the change in the composition of reportable segments and is included as an appendix to this release. Broadcast revenue in the quarter was $171.3 million as compared to $176.5 million in the year ago period.
On an organic basis, revenues declined by 2.1% year-over-year. Our strategy and offering continues to be well-received, and I'm proud to announce that in April, Grass Valley won the largest project in its history. Our IT introduction continues to gain traction with leading broadcasters around the world as evidenced by the additional 7 IP systems shipped during the quarter. Additionally, our broadband business continues to perform well. As MSOs invest heavily to keep up with the consumer demand for video.
EBITDA margins during the quarter were 13.6%, increasing 50 bases points from the prior year period and in line with typical seasonal patterns. Revenue within our enterprise platform was $135.9 million. On an organic basis, revenues increased by 4.1% and orders by 8% year-over-year. EBITDA margins were 17.5% during the quarter, an increase of $340 bases points from the prior year period. The strength and consistency of this platform is clearly the result of our team crisply executing a well-crafted strategic plan.
While our industrial platforms experienced the market softness that we anticipated and discussed with you in prior periods, the productivity measures will mitigate much of the impact to earnings. Combined revenues of $195 million declined by 5.8% from the year ago period. The organic decline was a result of continued softness within oil and gas applications and broad weakness in Latin America. Industrial connectivity had revenue of the quarter for $141.1 million, down 4.1% organically from the year ago period.
EBITDA margins were 16.3% for the first quarter, up 50 bases points and a solid outcome given the demand head winds it's facing. Industrial IT had revenue of $53.9 million, a decrease of 10.2% organically from the first quarter of 2015. Oil and gas applications continue to weigh on the platform, declining by 27%.
However, I'm encouraged by a solid book-to-bill of approximately 1.06 driven by strong demand from discreet applications within the EMEA region. As a result of lower volumes, EBITDA margins decreased 220 bases points from the year ago period. The productivity initiatives introduced last quarter for the industrial platforms are on track to deliver $6 million of savings in 2016 and $17 million of savings in 2017.
And finally, our network security platform increased revenues by 12.1% organically to $41.7 million. Non-renewable bookings during the quarter increased by more than 30%. This is obviously extremely encouraging. In addition to posting outstanding results, Tripwire had a very busy quarter. First announcing the release of Tripwire connect, a reporting, analytic and visualization tool that customers can use to manage the increasing complexity of cybersecurity threats.
Then at RSA, they announced a partnership with FireEye to provide integrated industrial network security solutions to critical infrastructure providers around the world. This will further enhance our unique position in the industrial markets to create leading cybersecurity solutions for global automation partners and other critical infrastructure.
And finally, they continue to win customers within the fast growing utility market with year-over-year growth exceeding 50%. EBITDA margins in the quarter were 27.5%. I'm encouraged by these new innovative products and expanded customer lists and new industry-leading partners that will allow us to meet the critical security needs of the marketplace.
I will now ask Henk to provide additional insight into our first quarter financial performance.
Henk Derksen - CFO
Thank you, John. I will start my comments with the results the quarter followed by a review of our segment results, a discussion of the balance sheet and close with our cash flow performance. As a reminder, I will be referencing adjusted results today. Please turn to slide five for a detailed consolidated review. First quarter revenues were $543.8 million. A decrease of $25.7 million, or 4.5% from $569.5 million in the first quarter 2015.
Currency translation and copper unfavorably impacted revenues by $10.9 million and $10.4 million respectively. The acquisition of a fiber solutions company increased our revenues by $1.5 million. On an organic basis revenues declined 1% from the year ago period. Gross profit margins for the quarter were 42.3% increasing 170 bases points from the year ago period, a function of improved productivity.
Sequentially gross profit margins declined 80 bases points in line with typical seasonal patterns. First quarter SG&A expenses were $116.2 million, or 21.4% of revenues. After adjusting for the impacts of currency and acquisitions, SG&A expenses declined by $1.5 million year-over-year, and $5.9 million sequentially. On the year-over-year basis, savings from our broadcast productivity programs of $5.5 million, more than offset continued investment in a network security and enterprise initiative.
R&D expenses for the quarter, were $35.9 million, or 6.6% of revenues. After adjusting for the impact of currency, R&D increased $2 million year-over-year reflective of our continued focus on innovative solutions for our customers. EBITDA margins were 16.4%, up 90 bases points year-over-year. Our enterprise, broadcast, network security and industrial connectivity platforms all contributed to this expansion. Despite the decline in revenues from the year ago period, EBITDA dollars increased slightly to $89.1 million, highlighting the resilience in our business model.
Sequentially, EBITDA margins decreased 260 bases points driven by seasonally lower volume. Net interest expense was $24.4 million, an increase of $600,000 year-over-year. The lower debt principal reduced interest expense by approximately $1 million in the quarter. This was more than offset by additional days which had an unfavorable impact of $1.6 million. We expect interest expense of approximately $24 million for the second quarter and $95 million for the full year. The adjusted effective tax rate for the first quarter was 20% compared to 18.8% in the prior year. For financial modelling purposes we recommend using a 20% effective tax rate for the second quarter and full year 2016. Earnings per share was $1.01 compared to $1 in the year ago period.
Please turn to slide 6. I will now discuss revenues and operating results by business sector. As a reminder, our audio video cable and connector results will be now recognized within the enterprise connectivity platform. After adjusting the for the change, broadcast solutions generated revenues of $171.3 million during the first quarter. Compared to the year ago period, revenues decreased $5.2 million. Currency translation unfavorably impacted revenues by $3 million and the acquired fiber solutions company contributed $1.5 million. On an organic basis, revenues declined 2.1% from the year ago period. Sequentially, revenues decreased in line with typical seasonal patterns.
Broadcast EBITDA margins improved year-over-year by 50 bases points to 13.6% of revenues. Sequentially EBITDA margins declined 630 bases points, mainly a result of seasonably lower volume. Our enterprise connectivity segment generated revenues of $135.9 million during the first quarter. A decrease of $5.9 million year-over-year. This segment faced a $2.9 million headwind from currency translation and $5 million unfavorable impact from lower copper prices. Organic growth in the quarter was $4.1% year-over-year with all major regions expanding.
The enterprise segment generated EBITDA margins of 17.5%, an increase of 340 bases points year-over-year. This segment benefited from leverage and volume and improved productivity. Sequentially EBITDA margins increased 70 bases points due to productivity. The industrial connectivity segment generated revenues of $141.1 million in the quarter. Currency translation and copper prices unfavorably impacted revenues by $4.1 million and $5.3 million respectively from the year ago period. On an organic basis, revenues declined 4.1% year over year and 2.1% sequentially.
EBITDA margins of 16.3% increased 50 bases points year-over-year primarily due to productivity. Sequentially EBITDA margins declined 50 bases points as a result of mix. Industrial IT segment generated revenues of $53.9 million. Currency translation unfavorably impacted the segment by $1 million year-over-year. On an organic basis, revenues declined 10.2% from the prior year period and 14.4% sequentially.
While the sequential decline is a function of typical seasonality, the year-over-year decline is primarily due to softer oil and gas markets. As Joe mentioned we're encouraged by a book to book ratio of 1.06 for the quarter. EBITDA margins of 16% declined 220 bases points year-over-year and 240 bases points sequentially. This was mainly a function of leverage on lower volume. As we execute on our productivity programs, we expect EBITDA margins for this platform to be at approximately 18% on a full year basis.
Finally, our network security segments continues to perform well generating revenues of $41.7 million, up 12.1% on an organic basis year-over-year. Sequentially, revenues declined 50% reflecting the seasonality of this business. EBITDA margins were 27.5% an improvement of 80 points from the year ago period. A result of leverage and volume partially offset by strategic investments. You will turn to slide 7.
I will begin with our balance sheet highlights. Our cash and cash equivalence balance at the end of the first quarter was $146 million. Compared to $217 million in the prior quarter. And $167 million the prior year. June 1st quarter we paid down $51 million of our outstanding debt reducing our total debt principal amount to $1.72 billion. Inventory turnover was 5.9 turns, down 1.2 turns sequentially and up 0.2 turns on a year-over-year bases.
Days Sales Outstanding was 60 days in the first quarter, an improvement of two days sequentially and three days year-over-year. PP&E turnover was 6.8 turns, down for 0.9 turns sequentially and 0.1 turn year-over-year.
Net leverage was 3.7 times net debt to EBITDA at the end of the quarter. We are on track to achieve a net leverage ratio of approximately 3.0 times by the end of 2016. Please turn to slide 8 for a few cash flow highlights. Cash flow from operations were $12.7 million, an increase of $60.9 million from the prior year period. This was mainly driven by improvements in our operating working capital performance with an impact of approximately $54 million. Net capital expenditures for the quarter was $13.4 million, decreasing $2.1 million year-over-year. Free cash flow was a use of $700,000, an improvement of $63 million from the year ago period.
That completes my prepared remarks. I would now like to turn this call back to our CEO, John Stroup, for the outlook. John?
John Stroup - President, CEO
Please turn to slide 9 for our outlook regarding the second quarter and full year 2016 results. Given the strong start, we have increased our revenue and earnings outlook for the year. We expect our broadband, enterprise and network security businesses will continue to perform well and benefit from favorable end-market conditions.
Although our industrial businesses are down year-over-year, sequential performance, backlog and order rates suggest stability that should lead to a better second half. We anticipate second quarter 2016 revenues to be between $570 million and $590 million and EPS is expected to be between $1.20 and $1.30. For the full year we now expect revenues between $2.32 billion and $2.37 billion. The expected range of EPS is now $5.15 to $5.45. That concludes our prepared remarks. Anthony, please open the call to questions.
Operator
Thank you. (Operator Instructions). Your first question is from Shawn Harrison, with Longbow Research.
Shawn Harrison - Analyst
Hi, good morning, everybody
John Stroup - President, CEO
Good morning, Shawn.
Shawn Harrison - Analyst
I guess just looking at broadcast, a couple different questions on that business. If you could just speak to the order rates you're seeing there? What exactly the IP shipments mean for you and how you expect the margins to continue to track for the year? I thought maybe they would be a little bit higher because of restructuring savings but maybe there's something else going on there? Just really what does a large project win mean? What are the IP solutions mean? I think you shipped four last quarter. Maybe the margin trajectory maybe for the year and maybe a run rate of EBITDA margins or something like that exiting the year?
John Stroup - President, CEO
Shawn, so obviously within our broadcast segment we've got two pieces particularly given the fact that we have moved the audio video cable business into the enterprise segment. So the broadband business which I think your questions pertain to Grass Valley but the broadband business had another very strong quarter. The Grass Valley business on a year-over-year bases revenues were down. We expected that.
That was sort of the last quarter of a difficult comparison as you recall last year we began to see softness in order rates in Q2 and revenue in Q2. On a year-over-year basis, I thought the team did a nice job on productivity improvement on a year-over-year basis within the segment. Productivity was about $7 million. So obviously with the high margins in that business, it's difficult to overcome the revenue but I think the fact that they were able to expand margins, EBITDA margins on a year-over-year bases was a good outcome. In terms of order rates, the order rates in the quarter were pretty much as we expected.
The book-to-bill and broadcast was just about 1.0 for the quarter but as we mentioned we did make progress on the IP products although that is still a relatively small percentage of the business. I think maybe more noteworthy is that we saw a nice tick-up in advertising spending at our customer so is even yesterday you may have noticed that CBS announced good earnings.
They had strong advertising. We're seeing that with other customers as well. That's good news for us and in April, not in the first quarter but in April we won the largest order in Grass Valley's history, in excess of $20 million. Now that is an order that will ship over two-and-a-half to three years. But it's obviously a great win for the Company. So the full year guidance, Shawn, that we increased from prior certainly includes the fact that we exit the first quarter feeling good about all of our businesses including Grass Valley
Shawn Harrison - Analyst
I guess just maybe, John, a follow-up for the year. If we think about the Olympics and the presidential elections, it looks like we have a clear front runner after Trump winning my home state last night. But just maybe does that benefit, are you expecting to see the benefit this year? I know it's typically happening but there's some questions on the Olympics this year given what's going on in Brazil and at least the US elections look like we'll have a lot of TV coverage.
John Stroup - President, CEO
Shawn, I would say that our guidance right now on the full year implies modest growth in Grass Valley on a year-over-year basis. So we are not incorporating a strong rebound in the Grass Valley business in 2016 to hit the numbers that we've given everybody today.
Shawn Harrison - Analyst
Okay. And then as a follow-up on cash flow expectations for the year. Henk noted it was better by 60 some odd million year-over-year so a heck of start to the year. Does that change your view in terms of free cash flow guidance for the year? I know you always try to target more than 100% of net income but it looks like with a strong start out of the gate, you should be potentially be able to exceed that target.
Henk Derksen - CFO
Strong start mainly driven by working capital performance with an intent to improve our linear pattern. The expectation for free cash flow on a full year bases is anywhere from $225 million and $230 million. That's a current view, Shawn.
Shawn Harrison - Analyst
So some of it was just pulled forward then because of the strong first quarter performances?
Henk Derksen - CFO
Correct.
Shawn Harrison - Analyst
Okay. Thanks so much and congratulations on the results, guys.
John Stroup - President, CEO
Thanks, Shawn.
Operator
Our next question comes from Steven Fox, from Cross Research.
Steven Fox - Analyst
Thanks, good morning. A couple questions from me. John, I understand what the numbers are telling you from an industrial standpoint. I was hoping you can give us some more anecdotal evidence as to why you're confident that industrial has some at least stable trends ahead of it based on what you're hearing from customers? And then, secondly, you highlighted a $340 bases points year-over-year improvement in enterprise. I was wondering if your could just break that down a little bit between mix, productivity, revenues and anything else that might go in there? Thanks.
John Stroup - President, CEO
Sure. Let me do it in reverse order, Steven. So if you look at the enterprise margin expansion on a year-over-year basis, it really came from all areas. We got fall through on the volume that we would have expected. We also saw favorable mix on a year-over-year basis and there was some productivity. So, I would say it's roughly a third, a third, a third. It's fairly uniform in terms of how they have addressed and improved their margins.
As you know they put a stronger emphasis on selling solutions. They put emphasis on trying to make certain that the cost structure is where it needs to be. And given the utilization of our factories right now we get good fall-through on incremental revenues, so it's good margin performance. As it relates to the industrial business, I would say that our comfort comes from a couple of areas. One is we saw good book-to-bill performance in both of our industrial businesses, industrial connectivity was 1.02, Industrial IT was 1.06. If we look at the backlog entering the quarter, it's where you would expect it to be given our guidance.
And then if you look at the performance by vertical, it also performed pretty much the way that we expected. So oil and gas for example on a year-over-year basis was down about 17%. That's now currently about 13% of our revenue within the industrial platform. The discreet business is performing pretty well. That's about 50% of our total business. And we think that will continue. We see really no change there. The US dollar is now stabilized from where it was trending downward a year ago and obviously that gave people reason to pause about when to place their purchases and so forth.
I was just in Germany last week at the large Hanover fair. Fairly optimistic view of everybody at the fair with the exception of oil and gas. So I think that as we start turning the page on some of these difficult comps for our industrial businesses around oil and gas which really starts happening in Q3. I think we're going to return to growth in our industrial platforms in the second half. And just right now it feels like we're pretty well positioned for the rest of the year.
Steven Fox - Analyst
Thank you. That's very helpful. And then just one quick follow-up on enterprise. Looking ahead in terms of enterprise demand, what are you seeing as the major influences that may be continue to give you at least comfort that you can grow? I think you posted 4% or so organic growth in the last quarter.
John Stroup - President, CEO
So the enterprise team right now is benefiting clearly from a pretty healthy non-residential environment in the United States and Canada, and we think that's going to continue. We watch very carefully the leading indicators that come from Dodge and other people and we tend to have about a three quarter lag on that performance. So that environment continues to be healthy. But then the other thing of course is that because we've got some very clear public company comps, we can look at how we're performing compared to others, and the team is outperforming.
And I think it's just really good execution and I look at their metrics which includes their funnel and when I have access to their funnel, it's pretty easy for me to predict their results in the next 90 days. And that gives us comfort about what we'll do in the second quarter and what we think we'll do in the back half.
Steven Fox - Analyst
Great. Thank you very much.
John Stroup - President, CEO
You're welcome.
Operator
Our next question comes from John Quealy, with Canaccord.
John Quealy - Analyst
First question in industrial. John, have we seen the bottom of oil and gas? We've seen a lot of companies that touch oil and gas saying that it didn't get much better and in fact it may have ticked worse from a sentiment perspective. I know you talked about book-to-bill but qualitatively, can you give us a little bit more there about energy? Is it still going to be incrementally worse maybe Q2/Q3?
John Stroup - President, CEO
I will tell you what we are assuming. We had assumed that in 2016 our oil and gas business was going to be down about 30% for the full year. In the first quarter it was down 17%. So it did a little bit better than what we had thought and that's largely because we had a couple of nice projects in Canada in our industrial connectivity business that were scheduled and funded in the prior year. As we look forward, we're still hanging on to that 30% number because we think that's appropriate. And then that would obviously suggest that on a year over year basis, things would get a little bit worse.
It's hard to say. I mean I would say that it's still very difficult to determine where oil prices are going to settle out. I do feel like, though, in the second half there's going to be clearly a lot less headwind on a year-over-year basis. Most of our conversations with customers do seem to suggest stability. It certainly feels a lot different than it did a year ago. And if I look again at my backlog and my order rates, compared to where I typically am moving into the second quarter, those numbers all seem to hold very nicely with our projections and our estimates.
John Quealy - Analyst
And you're comfortable in that sub segment on pricing in terms of whether you hold price or you decide to work against price for share, you're still comfortable with those dynamics?
John Stroup - President, CEO
Well, so we make those decisions obviously on a project-by-project basis and they're influenced an awful lot by the mix of products and what products might be influenced in a project. I don't believe that there's going to be reason for the team to get more aggressive on pricing than they have been given the fact that our utilization of our factories is pretty good right now.
John Quealy - Analyst
Right.
John Stroup - President, CEO
So these products don't exclusively go to oil and gas. So it's not as if we have an entire category of products that are being impacted by this vertical segment. We have flexibility and levers as it relates to increasing our share in other segments and I think the team's done that and I think they know how it handle it.
John Quealy - Analyst
Great. Thanks for that. Switching gears, network security. And I'm sorry, I missed this number. I want to make sure I get it correct. Non-renewal bookings are up 30% year-on-year. Is that right? Do I have that right?
John Stroup - President, CEO
You have that exactly right.
John Quealy - Analyst
Okay. So that seems like a higher number, number one, is that a correct assumption? Number two, were there incentives or new sales relationships? What is driving some of that so early in the year?
John Stroup - President, CEO
You're right. The 30% is a high number. It's higher than what we've seen during our ownership period and I would have to go back in history to see whether or not or how to compares to results over the last, say, five years. But 30% was very robust, very encouraging and I would say that the performance was broad based. If I were to highlight a couple of things, I would say the performance outside the United States was especially strong.
The team has made incremental investment in resources, particularly in the European market that paid off in the first quarter. We also had a nice federal order in the first quarter that we had been working on. Quite frankly I think the team thought we may have gotten into the fourth, we got in the first so that was great. And the commercial business in the United States continues to be very healthy. Utility business was up 50%. We signed a new partnership with FireEye. There's just a lot of good things going on right now in that business.
John Quealy - Analyst
Okay. And then lastly, Henk, on the cash side, while we're raising guidance a little bit on the P&L free cash expectations are pretty much consistent. Would you categorize that as conservatism or is there a little bit more investment going on that takes away from some of the P&L goodness?
Henk Derksen - CFO
I think it's appropriate. It's early in the year. We clearly improved our linear pattern with (inaudible) in Q1. But working towards that $225 million to $230 million of free cash flow feels an appropriate number for us.
John Quealy - Analyst
Okay. Great. Thanks, guys. Nice job again.
John Stroup - President, CEO
Thank you.
Operator
Our next question comes from Charles Redding, with BB&T Capital Markets.
Charles Redding - Analyst
Hi, good morning, gentlemen. Thanks for taking my call.
John Stroup - President, CEO
Good morning, Charles.
Charles Redding - Analyst
Quick follow-up on utility growth in Tripwire. If you clarify what that was again on the quarter? And then, maybe in terms of utilities specifically were there any one or two items that contributed here?
John Stroup - President, CEO
The growth in the utilities in the quarter year-over-year was 50%. We are a working with a very large set of utility customers. I don't have in front of me the breakdown by customer. I'm not aware of any one customer driving a disproportionate percentage of that growth. So I think it's fairly distributed. And obviously, it's been an area of focus for the team for the last 12 to 18 months and I think that they've done a really nice job. They've executed well.
Charles Redding - Analyst
Great. And then you mentioned the better non-res in Canada. I'm assuming this is mostly non-commodity Centrix driven. Can you just remind us what your Canadian exposure is and where specifically is this growth coming from?
John Stroup - President, CEO
You're right. The growth in Canada and our enterprise business in general in Canada is influenced predominantly in urban environments around residential construction. Toronto continues to be very strong. I think that our enterprise business, our business in Canada of enterprise is about 20%.
Henk Derksen - CFO
Yeah, I think a little higher. I think it's closer to 30%.
John Stroup - President, CEO
So approximately 30% of our enterprise business is in Canada. We've continued to see good growth there but mainly driven out of urban environments like Toronto and Montreal.
Charles Redding - Analyst
That's very encouraging. Thanks for the time.
John Stroup - President, CEO
You're welcome.
Henk Derksen - CFO
Thanks, Charles.
Operator
Our next question comes from Noelle Dilts, with Stifel.
Noelle Dilts - Analyst
Hi, thanks, good morning. Circling back to network security, no really strong EBITDA margins here in the quarter, could you just speak to how sustainable margins are at these levels and how you're going to keep up margins going forward.
John Stroup - President, CEO
Can you repeat that?
Noelle Dilts - Analyst
I was just asking about network security margins. I thought they were really strong in the quarter. Can you comment how sustainable margins are at this higher level and just how you're thinking about that moving forward?
John Stroup - President, CEO
Sure. The margins in the quarter for network security were 27.5%. They were actually down a little bit sequentially, up slightly on a year-over-year basis. You would expect them to be down a little bit sequentially because the fourth quarter end up being such a strong quarter from a volume point-of-view. I think these are about where the margins should be. These margins by the way do include incremental spending in the business on a year-over-year basis. So the team continues to invest in salespeople, engineers and so forth. I think these, to me anyway, feel like kind of the right EBITDA margins and I would expect them to hold for the full year.
Noelle Dilts - Analyst
Okay. Makes sense. And then, as you exit the year getting to that three times leverage number, can you just talk about how you're thinking about resuming M&A activity and just your pipeline at this point and how valuations are looking in the market?
John Stroup - President, CEO
Sure. The pipeline is very strong. So even though we're committed to reducing our leverage, we have not in any way decommitted to our activity around cultivation and making certain that we spend our time smartly and thoughtfully with respect to the kinds of companies that we think would be helpful to execute our strategic plan. So that's unchanged. As it relates to valuation, I would say that it's not really changed very much over the last 12 to 18 months, meaning that it's relatively rich.
Obviously private companies are taking notice of where public companies are trading at and they use that as a benchmark. I would say the only area where things have gotten a little bit more interesting would be companies that have any exposure to oil and gas who are trying to find their way through it. Some of those companies are maybe not capitalized the way they would like to be and therefore are trying to find ways to kind of get through this situation and that could be an opportunity for us. But, you know, we continue to view M&A as an incredibly important part of our strategy and I would expect that that would continue.
Noelle Dilts - Analyst
Great. Thank you.
John Stroup - President, CEO
You're welcome.
Operator
(Operator Instructions). It appears we have a follow-up question from Shawn Harrison, with Longbow Research.
Shawn Harrison - Analyst
Hi again. Two clarifications. The project you had in industrial that came in, was that within connectivity or IT? Because I think the connectivity, at least the growth declines year-over-year, improved into the first quarter from the fourth quarter?
John Stroup - President, CEO
Yes. That was industrial connectivity, Shawn.
Shawn Harrison - Analyst
Okay. And so that will normalize down to kind of a high single-digit decline into the second quarter organically, is that the way to think about it?
John Stroup - President, CEO
So I think that if you look at the organic growth for industrial connectivity in the second quarter on a year-over-year basis, I think you're still looking at sort of mid single digits declines on on a year-over-year basis.
Shawn Harrison - Analyst
Okay. And then just thinking about the change in the full year guidance. What's baked in now in terms of copper in the year? I'm sorry if I missed that. It's probably both I think moved a little bit this your favor from when you provided the original guidance back in December.
John Stroup - President, CEO
Henk?
Henk Derksen - CFO
Sure. (inaudible) was possibly the most important assumption for the full year is about 110.
Shawn Harrison - Analyst
Okay. That was I believe it was 105 previously?
Henk Derksen - CFO
That's correct. And copper is 210, 215.
Shawn Harrison - Analyst
Okay. So a little bit of a tailwind there. Okay. Perfect. Thank you.
Henk Derksen - CFO
You're welcome.
John Stroup - President, CEO
You're welcome.
Operator
Matt Tractenberg, there are no further questions at this time. Please continue.
Matt Tractenberg - VP of IR
Thank you, Anthony and thank you everyone for joining today's call. If you have any questions, please reach out to the IR team here at Belden. Our email address is investor.relations@belden.com. Have a great day, everyone.
Operator
Thank you ladies and gentlemen. This concludes our call for today. You may now disconnect from the call and thank you for participating.