Penn Engineering & Manufacturing Corp. v. Marsden
2:25-cv-00467
E.D. Wis.Sep 5, 2025Background
- Plaintiffs Penn Engineering & Manufacturing Corp. and Heyco Products Corp. sued former employee Thomas Marsden and HellermannTyton alleging misappropriation of trade secrets, contract breach, and related claims; expedited discovery and an evidentiary hearing were held July 16–17, 2025.
- The Court entered a protective order and directed parties to identify exhibits and transcript portions warranting sealing or redaction after the hearing.
- Penn Engineering moved to restrict public access to numerous exhibits (including native spreadsheets and attachments) on the ground they contain trade secrets and competitively sensitive customer/product/lead information.
- Marsden objected to sealing Exhibit 13, arguing the material was public and not Penn’s trade secret; Penn disputed and explained the exhibit contained confidential customer/product/lead links.
- HellermannTyton moved to seal its offer letter to Marsden (Exhibit 62), asserting it disclosed compensation structure and negotiation terms that could harm its competitive position if public.
- The parties jointly sought redactions of limited transcript passages from Volume 1 as containing trade-secret material; the Court considered applicable law presuming public access but allowing secrecy for trade secrets or privileged/confidential statutory information.
Issues
| Issue | Plaintiff's Argument | Defendant's Argument | Held |
|---|---|---|---|
| Whether Penn Engineering’s identified exhibits should be sealed | Exhibits contain trade secrets (customer lists, product info, leads); public disclosure would damage competitive interests | Marsden objected to Exhibit 13, claiming it contains public information and not Penn’s trade secrets | Court granted sealing for all listed Penn exhibits, overruling Marsden’s objection to Exhibit 13 |
| Whether HellermannTyton’s offer letter (Ex. 62) should be sealed | N/A (response did not oppose) | HellermannTyton: letter reveals compensation structure and negotiation terms that would harm competitive position if disclosed | Court granted sealing of Exhibit 62 |
| Whether limited transcript portions should be redacted | Transcript Vol. 1 pages identified contain trade-secret material and should be redacted from the public version | No substantive public-law argument recorded against redaction in joint filing | Court ordered redactions at 72:7, 173:17, 205:19–22 and sealed the unredacted transcript version |
| Standard for sealing judicial filings and hearings involving trade secrets | Sealing appropriate where documents contain trade secrets and disclosure would confer unfair competitive advantage | Public presumption of access; sealing limited to trade secrets, privileged material, or statutory confidentiality | Court applied Seventh Circuit standards, required parties to identify and justify sealing, and found plaintiff and HellermannTyton met the burden |
Key Cases Cited
- GEA Grp. AG v. Flex-N-Gate Corp., 740 F.3d 411 (2014) (documents and hearing transcripts are presumptively public)
- Baxter Intern., Inc. v. Abbott Lab’ys, 297 F.3d 544 (2002) (party seeking sealing must identify and explain why each document is a trade secret)
- SmithKline Beecham Corp. v. Pentech Pharm., Inc., 261 F. Supp. 2d 1002 (2003) (sealing appropriate when disclosure gives competitors an unfair advantage)