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Tandem Diabetes Care, Inc. (TNDM) and BioAmber Inc. (BIOA) Activist Update

Blickenstaff Kim D has filed an SC 13D/A form with the Securities and Exchange Commission (SEC) disclosing ownership of 2,004,800 shares of Tandem Diabetes Care, Inc. (NASDAQ:TNDM). This represents 4.4 percent ownership of the company. Previously, Blickenstaff Kim D had reported owning 1,254,801 shares, indicating an increase of 59.77 percent. Tandem Diabetes Care, Inc. has declared a standard industrial code (sic) of 3841 which is the “Surgical and Medical Instruments and Apparatus” industry.

Sabby Management, LLC has filed an SC 13G form with the Securities and Exchange Commission (SEC) disclosing ownership of 5,666,666 shares of BioAmber Inc. (NYSE:BIOA). This represents 8.41 percent ownership of the company. Previously, Sabby Management, LLC had reported owning 2,521,319 shares, indicating an increase of 124.75 percent. BioAmber Inc. has declared a standard industrial code (sic) of 286 which is the “Industrial Organic Chemicals” industry.

When a person or group of persons acquires beneficial ownership of more than 5% of a company’s equity securities, they are required to file a Schedule 13D or 13G with the SEC. If these groups intend to influence management into changing the business strategy, they are considered “activist” investors. There is considerable academic research that suggest activist investors contribute to excess returns in equities in the subsequent twelve months after the event.

Investors that acquire 10% or more of a company’s shares, or that gain a board seat, are considered insiders by the SEC and are subject to stricter insider trading filing requirements.

Amended Activist Investor Filings

Intellia Therapeutics, Inc. (NTLA) – Orbimed Advisors Llc has filed an amended Schedule 13D/A, reporting a 4.99% ownership stake in Intellia Therapeutics. This is a decrease of 16.69% from their previous filing.

Genesis Healthcare, Inc. (GEN) – Fishman Steven E. has filed an amended Schedule 13D/A, reporting a 64.00% ownership stake in Genesis Healthcare. This is a decrease of 1.23% from their previous filing.

Tandem Diabetes Care, Inc. (TNDM) – Blickenstaff Kim D has filed an amended Schedule 13D/A, reporting a 4.40% ownership stake in Tandem Diabetes Care. This is a decrease of 61.74% from their previous filing.

New Passive Investor Filings

Investors that acquire more than 5% of the shares of a company but have no intention of influencing management are considered passive investors and must file a 13G.

BioAmber Inc. (BIOA) – Sabby Management, LLC has filed a new SC 13G, reporting a 8.41% ownership stake in BioAmber. This is an increase of 73.76% from their previous filing.

OpGen, Inc. (OPGN) – Sabby Management, LLC has filed a new SC 13G, reporting a 5.17% ownership stake in OpGen.

Jacksonville Bancorp, Inc. (JXSB) – Brown Trout Management, LLC has filed a new SC 13G, reporting a 5.00% ownership stake in Jacksonville Bancorp.

Tandem Diabetes Care, Inc. (TNDM) – Corrib Capital Management, L.p. has filed a new SC 13G, reporting a 11.20% ownership stake in Tandem Diabetes Care.

Global Partner Acquisition Corp. (GPAC) – Baleen Capital Management Llc has filed a new SC 13G, reporting a 13.10% ownership stake in Global Partner Acquisition.

RBB Bancorp (RBB) – FJ Capital Management LLC has filed a new SC 13G, reporting a 5.22% ownership stake in RBB Bancorp.

NovaCopper Inc. (NCQ) – Selz Capital LLC has filed a new SC 13G, reporting a 5.40% ownership stake in NovaCopper.

Catalyst Biosciences Inc. (CBIO) – Flynn James E has filed a new SC 13G, reporting a 11.57% ownership stake in Catalyst Biosciences.

Marrone Bio Innovations, Inc. (MBII) – Van Herk Investments B.v. has filed a new SC 13G, reporting a 12.20% ownership stake in Marrone Bio Innovations.

Amended Passive Investor Filings

A.H. Belo Corp. (AHC) – Punch & Associates Investment Management, Inc. has filed an amended Schedule 13D/A, reporting a 0.00% ownership stake in A.H. Belo. This is a decrease of 100.00% from their previous filing.

Gran Tierra Energy, Inc. (GTE) – Luminus Management Llc has filed an amended Schedule 13D/A, reporting a 8.47% ownership stake in Gran Tierra Energy.

Energy Recovery, Inc. (ERII) – Sundt AS has filed an amended Schedule 13D/A, reporting a 8.21% ownership stake in Energy Recovery. This is an increase of 42.29% from their previous filing.

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