Holding(s) in Company

For filings with the FCA include the annex
For filings with issuer exclude the annex
TR-1: NOTIFICATION OF MAJOR INTEREST IN SHARESi
1. Identity of the issuer or the underlying issuer of existing shares to which voting rights are attached: ii				Bioventix (Sedol B4QVDF0)
2 Reason for the notification (please tick the appropriate box or boxes):
An acquisition or disposal of voting rights					X
An acquisition or disposal of qualifying financial instruments which may result in the acquisition of shares already issued to which voting rights are attached
An acquisition or disposal of instruments with similar economic effect to qualifying financial instruments
An event changing the breakdown of voting rights
Other (please specify):
3. Full name of person(s) subject to the notification obligation: iii		CASTLEFIELD FUND PARTNERS LIMITED
4. Full name of shareholder(s)  (if different from 3.):iv
5. Date of the transaction and date on which the threshold is crossed or reached: v		9th  January 2017
6. Date on which issuer notified:		12th January 2017
7. Threshold(s) that is/are crossed or reached: vi, vii		5%

8. Notified details:

A: Voting rights attached to shares viii, ix

Class/type of shares if possible using the ISIN CODE

Situation previous to the triggering transaction

Resulting situation after the triggering transaction

Number of Shares

Number of Voting Rights

Number of shares

Number of voting rights

% of  voting rights x

Direct

Direct xi

Indirect xii

Direct

Indirect

GB00B4QVDF07

250,000

250,000

265,000

265,000

5.197%

B: Qualifying Financial Instruments

Resulting situation after the triggering transaction

Type of financial instrument

Expiration date xiii

Exercise/ Conversion Period xiv

Number of voting rights that may be acquired if the instrument is exercised/ converted.

% of voting rights

C: Financial Instruments with similar economic effect to Qualifying Financial Instruments xv, xvi

Resulting situation after the triggering transaction

Type of financial instrument

Exercise price

Expiration date xvii

Exercise/ Conversion period xviii

Number of voting rights instrument refers to

% of voting rights xix, xx

Nominal

Delta

Total (A+B+C)

Number of voting rights

Percentage of voting rights

265,000

5.197%

9. Chain of controlled undertakings through which the voting rights and/or the financial instruments are effectively held, if applicable: xxi
Proxy Voting:
10. Name of the proxy holder:
11. Number of voting rights proxy holder will cease to hold:
12. Date on which proxy holder will cease to hold voting rights:
13. Additional information:	Percentage based on Issued Share Capital of 5,098,656
14. Contact name:	Richard Vickers
15. Contact telephone number:	0161 233 4890

Note: Annex should only be submitted to the FSA not the issuer
Annex: Notification of major interests in sharesxxii
A: Identity of the persons or legal entity subject to the notification obligation
Full name (including legal form of legal entities)
Contact address (registered office for legal entities)
Phone number & email
Other useful information (at least legal representative for legal persons)
B: Identity of the notifier, if applicable
Full name
Contact address
Phone number & email
Other useful information (e.g. functional relationship with the person or legal entity subject to the notification obligation)
C: Additional information
For notes on how to complete form TR-1 please see the FSA website.