<PAGE>
UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, DC 20549
SCHEDULE 13G
Under the Securities Exchange Act of 1934
(Amendment No. ____)*
Heartstream, Inc.
(Name of Issuer)
Common Stock Par Value $.001
(Title of Class of Securities)
421963109
(CUSIP Number)
*The remainder of this cover page shall be filled out for a reporting person's
initial filing on this form with respect to the subject class of securities, and
for any subsequent amendment containing information which would alter the
disclosures provided in a prior cover page.
The information required in the remainder of this cover page shall not be deemed
to be "filed" for the purpose of Section 18 of the Securities Exchange Act of
1934 ("Act") or otherwise subject to the liabilities of that section of the Act
but shall be subject to all other provisions of the Act (however, see the
Notes).
<PAGE>
- ----------------------- ---------------------
CUSIP NO. 421963109 13G PAGE 2 OF 19 PAGES
- ----------------------- ---------------------
- ------------------------------------------------------------------------------
NAME OF REPORTING PERSON
1 S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
Oak Investment Partners VI, Limited Partnership
06-1412578
- ------------------------------------------------------------------------------
CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
2 (a) [_]
(b) [_]
- ------------------------------------------------------------------------------
SEC USE ONLY
3
- ------------------------------------------------------------------------------
CITIZENSHIP OR PLACE OF ORGANIZATION
4
Delaware
- ------------------------------------------------------------------------------
SOLE VOTING POWER
5
NUMBER OF 698,000 Shares of Common Stock
SHARES -----------------------------------------------------------
SHARED VOTING POWER
BENEFICIALLY 6
Not Applicable
OWNED BY
-----------------------------------------------------------
EACH SOLE DISPOSITIVE POWER
7
REPORTING 698,000 Shares of Common Stock
PERSON -----------------------------------------------------------
SHARED DISPOSITIVE POWER
WITH 8
Not Applicable
- ------------------------------------------------------------------------------
AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
9
698,000 Shares of Common Stock
- ------------------------------------------------------------------------------
CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*
10
[_]
- ------------------------------------------------------------------------------
PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9
11
6.0%
- ------------------------------------------------------------------------------
TYPE OF REPORTING PERSON*
12
PN
- ------------------------------------------------------------------------------
*SEE INSTRUCTION BEFORE FILLING OUT!
<PAGE>
- ----------------------- ---------------------
CUSIP NO. 421963109 13G PAGE 3 OF 19 PAGES
- ----------------------- ---------------------
- ------------------------------------------------------------------------------
NAME OF REPORTING PERSON
1 S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
Oak Associates VI, LLC
06-1412579
- ------------------------------------------------------------------------------
CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
2 (a) [_]
(b) [_]
- ------------------------------------------------------------------------------
SEC USE ONLY
3
- ------------------------------------------------------------------------------
CITIZENSHIP OR PLACE OF ORGANIZATION
4
Delaware
- ------------------------------------------------------------------------------
SOLE VOTING POWER
5
NUMBER OF Not Applicable
SHARES -----------------------------------------------------------
SHARED VOTING POWER
BENEFICIALLY 6
698,000 Shares of Common Stock
OWNED BY
-----------------------------------------------------------
EACH SOLE DISPOSITIVE POWER
7
REPORTING Not Applicable
PERSON -----------------------------------------------------------
SHARED DISPOSITIVE POWER
WITH 8
698,000 Shares of Common Stock
- ------------------------------------------------------------------------------
AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
9
698,000 Shares of Common Stock
- ------------------------------------------------------------------------------
CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*
10
[_]
- ------------------------------------------------------------------------------
PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9
11
6.0%
- ------------------------------------------------------------------------------
TYPE OF REPORTING PERSON*
12
OO-LLC
- ------------------------------------------------------------------------------
*SEE INSTRUCTION BEFORE FILLING OUT!
<PAGE>
- ----------------------- ---------------------
CUSIP NO. 421963109 13G PAGE 4 OF 19 PAGES
- ----------------------- ---------------------
- ------------------------------------------------------------------------------
NAME OF REPORTING PERSON
1 S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
Oak VI Affiliates Fund, Limited Partnership
06-1414970
- ------------------------------------------------------------------------------
CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
2 (a) [_]
(b) [_]
- ------------------------------------------------------------------------------
SEC USE ONLY
3
- ------------------------------------------------------------------------------
CITIZENSHIP OR PLACE OF ORGANIZATION
4
Delaware
- ------------------------------------------------------------------------------
SOLE VOTING POWER
5
NUMBER OF 16,286 Shares of Common Stock
SHARES -----------------------------------------------------------
SHARED VOTING POWER
BENEFICIALLY 6
Not Applicable
OWNED BY
-----------------------------------------------------------
EACH SOLE DISPOSITIVE POWER
7
REPORTING 16,286 Shares of Common Stock
PERSON -----------------------------------------------------------
SHARED DISPOSITIVE POWER
WITH 8
Not Appliable
- ------------------------------------------------------------------------------
AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
9
16,286 Shares of Common Stock
- ------------------------------------------------------------------------------
CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*
10
[_]
- ------------------------------------------------------------------------------
PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9
11
0.1%
- ------------------------------------------------------------------------------
TYPE OF REPORTING PERSON*
12
PN
- ------------------------------------------------------------------------------
*SEE INSTRUCTION BEFORE FILLING OUT!
<PAGE>
- ----------------------- ---------------------
CUSIP NO. 421963109 13G PAGE 5 OF 19 PAGES
- ----------------------- ---------------------
- ------------------------------------------------------------------------------
NAME OF REPORTING PERSON
1 S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
Oak VI Affiliates, LLC
06-1414968
- ------------------------------------------------------------------------------
CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
2 (a) [_]
(b) [_]
- ------------------------------------------------------------------------------
SEC USE ONLY
3
- ------------------------------------------------------------------------------
CITIZENSHIP OR PLACE OF ORGANIZATION
4
Delaware
- ------------------------------------------------------------------------------
SOLE VOTING POWER
5
NUMBER OF Not Applicable
SHARES -----------------------------------------------------------
SHARED VOTING POWER
BENEFICIALLY 6
16,286 Shares of Common Stock
OWNED BY
-----------------------------------------------------------
EACH SOLE DISPOSITIVE POWER
7
REPORTING Not Applicable
PERSON -----------------------------------------------------------
SHARED DISPOSITIVE POWER
WITH 8
16,286 Shares of Common Stock
- ------------------------------------------------------------------------------
AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
9
16,286 Shares of Common Stock
- ------------------------------------------------------------------------------
CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*
10
[_]
- ------------------------------------------------------------------------------
PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9
11
0.1%
- ------------------------------------------------------------------------------
TYPE OF REPORTING PERSON*
12
OO-LLC
- ------------------------------------------------------------------------------
*SEE INSTRUCTION BEFORE FILLING OUT!
<PAGE>
- ----------------------- ---------------------
CUSIP NO. 421963109 13G PAGE 6 OF 19 PAGES
- ----------------------- ---------------------
- ------------------------------------------------------------------------------
NAME OF REPORTING PERSON
1 S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
Oak Management Corporation
06-0990851
- ------------------------------------------------------------------------------
CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
2 (a) [_]
(b) [_]
- ------------------------------------------------------------------------------
SEC USE ONLY
3
- ------------------------------------------------------------------------------
CITIZENSHIP OR PLACE OF ORGANIZATION
4
Delaware
- ------------------------------------------------------------------------------
SOLE VOTING POWER
5
NUMBER OF Not Applicable
SHARES -----------------------------------------------------------
SHARED VOTING POWER
BENEFICIALLY 6
714,286 Shares of Common Stock
OWNED BY
-----------------------------------------------------------
EACH SOLE DISPOSITIVE POWER
7
REPORTING Not Applicable
PERSON -----------------------------------------------------------
SHARED DISPOSITIVE POWER
WITH 8
714,286 Shares of Common Stock
- ------------------------------------------------------------------------------
AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
9
714,286 Shares of Common Stock
- ------------------------------------------------------------------------------
CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*
10
[_]
- ------------------------------------------------------------------------------
PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9
11
6.2%
- ------------------------------------------------------------------------------
TYPE OF REPORTING PERSON*
12
CO
- ------------------------------------------------------------------------------
*SEE INSTRUCTION BEFORE FILLING OUT!
<PAGE>
- ----------------------- ---------------------
CUSIP NO. 421963109 13G PAGE 7 OF 19 PAGES
- ----------------------- ---------------------
- ------------------------------------------------------------------------------
NAME OF REPORTING PERSON
1 S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
Bandel L. Carano
- ------------------------------------------------------------------------------
CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
2 (a) [_]
(b) [_]
- ------------------------------------------------------------------------------
SEC USE ONLY
3
- ------------------------------------------------------------------------------
CITIZENSHIP OR PLACE OF ORGANIZATION
4
United States
- ------------------------------------------------------------------------------
SOLE VOTING POWER
5
NUMBER OF Not Applicable
SHARES -----------------------------------------------------------
SHARED VOTING POWER
BENEFICIALLY 6
714,286 Shares of Common Stock
OWNED BY
-----------------------------------------------------------
EACH SOLE DISPOSITIVE POWER
7
REPORTING Not Applicable
PERSON -----------------------------------------------------------
SHARED DISPOSITIVE POWER
WITH 8
714,286 Shares of Common Stock
- ------------------------------------------------------------------------------
AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
9
714,286 Shares of Common Stock
- ------------------------------------------------------------------------------
CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*
10
[_]
- ------------------------------------------------------------------------------
PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9
11
6.2%
- ------------------------------------------------------------------------------
TYPE OF REPORTING PERSON*
12
IN
- ------------------------------------------------------------------------------
*SEE INSTRUCTION BEFORE FILLING OUT!
<PAGE>
- ----------------------- ---------------------
CUSIP NO. 421963109 13G PAGE 8 OF 19 PAGES
- ----------------------- ---------------------
- ------------------------------------------------------------------------------
NAME OF REPORTING PERSON
1 S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
Gerald R. Gallagher
- ------------------------------------------------------------------------------
CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
2 (a) [_]
(b) [_]
- ------------------------------------------------------------------------------
SEC USE ONLY
3
- ------------------------------------------------------------------------------
CITIZENSHIP OR PLACE OF ORGANIZATION
4
United States
- ------------------------------------------------------------------------------
SOLE VOTING POWER
5
NUMBER OF Not Applicable
SHARES -----------------------------------------------------------
SHARED VOTING POWER
BENEFICIALLY 6
714,286 Shares of Common Stock
OWNED BY
-----------------------------------------------------------
EACH SOLE DISPOSITIVE POWER
7
REPORTING Not Applicable
PERSON -----------------------------------------------------------
SHARED DISPOSITIVE POWER
WITH 8
714,286 Shares of Common Stock
- ------------------------------------------------------------------------------
AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
9
714,286 Shares of Common Stock
- ------------------------------------------------------------------------------
CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*
10
[_]
- ------------------------------------------------------------------------------
PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9
11
6.2%
- ------------------------------------------------------------------------------
TYPE OF REPORTING PERSON*
12
IN
- ------------------------------------------------------------------------------
*SEE INSTRUCTION BEFORE FILLING OUT!
<PAGE>
- ----------------------- ---------------------
CUSIP NO. 421963109 13G PAGE 9 OF 19 PAGES
- ----------------------- ---------------------
- ------------------------------------------------------------------------------
NAME OF REPORTING PERSON
1 S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
Edward F. Glassmeyer
- ------------------------------------------------------------------------------
CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
2 (a) [_]
(b) [_]
- ------------------------------------------------------------------------------
SEC USE ONLY
3
- ------------------------------------------------------------------------------
CITIZENSHIP OR PLACE OF ORGANIZATION
4
United States
- ------------------------------------------------------------------------------
SOLE VOTING POWER
5
NUMBER OF Not Applicable
SHARES -----------------------------------------------------------
SHARED VOTING POWER
BENEFICIALLY 6
714,286 Shares of Common Stock
OWNED BY
-----------------------------------------------------------
EACH SOLE DISPOSITIVE POWER
7
REPORTING Not Applicable
PERSON -----------------------------------------------------------
SHARED DISPOSITIVE POWER
WITH 8
714,286 Shares of Common Stock
- ------------------------------------------------------------------------------
AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
9
714,286 Shares of Common Stock
- ------------------------------------------------------------------------------
CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*
10
[_]
- ------------------------------------------------------------------------------
PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9
11
6.2%
- ------------------------------------------------------------------------------
TYPE OF REPORTING PERSON*
12
IN
- ------------------------------------------------------------------------------
*SEE INSTRUCTION BEFORE FILLING OUT!
<PAGE>
- ----------------------- ---------------------
CUSIP NO. 421963109 13G PAGE 10 OF 19 PAGES
- ----------------------- ---------------------
- ------------------------------------------------------------------------------
NAME OF REPORTING PERSON
1 S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
Fredric W. Harman
- ------------------------------------------------------------------------------
CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
2 (a) [_]
(b) [_]
- ------------------------------------------------------------------------------
SEC USE ONLY
3
- ------------------------------------------------------------------------------
CITIZENSHIP OR PLACE OF ORGANIZATION
4
United States
- ------------------------------------------------------------------------------
SOLE VOTING POWER
5
NUMBER OF Not Applicable
SHARES -----------------------------------------------------------
SHARED VOTING POWER
BENEFICIALLY 6
714,286 Shares of Common Stock
OWNED BY
-----------------------------------------------------------
EACH SOLE DISPOSITIVE POWER
7
REPORTING Not Applicable
PERSON -----------------------------------------------------------
SHARED DISPOSITIVE POWER
WITH 8
714,286 Shares of Common Stock
- ------------------------------------------------------------------------------
AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
9
714,286 Shares of Common Stock
- ------------------------------------------------------------------------------
CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*
10
[_]
- ------------------------------------------------------------------------------
PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9
11
6.2%
- ------------------------------------------------------------------------------
TYPE OF REPORTING PERSON*
12
IN
- ------------------------------------------------------------------------------
*SEE INSTRUCTION BEFORE FILLING OUT!
<PAGE>
- ----------------------- ---------------------
CUSIP NO. 421963109 13G PAGE 11 OF 19 PAGES
- ----------------------- ---------------------
- ------------------------------------------------------------------------------
NAME OF REPORTING PERSON
1 S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
Ann H. Lamont
- ------------------------------------------------------------------------------
CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
2 (a) [_]
(b) [_]
- ------------------------------------------------------------------------------
SEC USE ONLY
3
- ------------------------------------------------------------------------------
CITIZENSHIP OR PLACE OF ORGANIZATION
4
United States
- ------------------------------------------------------------------------------
SOLE VOTING POWER
5
NUMBER OF Not Applicable
SHARES -----------------------------------------------------------
SHARED VOTING POWER
BENEFICIALLY 6
714,286 Shares of Common Stock
OWNED BY
-----------------------------------------------------------
EACH SOLE DISPOSITIVE POWER
7
REPORTING Not Applicable
PERSON -----------------------------------------------------------
SHARED DISPOSITIVE POWER
WITH 8
714,286 Shares of Common Stock
- ------------------------------------------------------------------------------
AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
9
714,286 Shares of Common Stock
- ------------------------------------------------------------------------------
CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*
10
[_]
- ------------------------------------------------------------------------------
PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9
11
6.2%
- ------------------------------------------------------------------------------
TYPE OF REPORTING PERSON*
12
IN
- ------------------------------------------------------------------------------
*SEE INSTRUCTION BEFORE FILLING OUT!
<PAGE>
- ----------------------- ---------------------
CUSIP NO. 421963109 13G PAGE 12 OF 19 PAGES
- ----------------------- ---------------------
- ------------------------------------------------------------------------------
NAME OF REPORTING PERSON
1 S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
Eileen M. More
- ------------------------------------------------------------------------------
CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
2 (a) [_]
(b) [_]
- ------------------------------------------------------------------------------
SEC USE ONLY
3
- ------------------------------------------------------------------------------
CITIZENSHIP OR PLACE OF ORGANIZATION
4
United States
- ------------------------------------------------------------------------------
SOLE VOTING POWER
5
NUMBER OF Not Applicable
SHARES -----------------------------------------------------------
SHARED VOTING POWER
BENEFICIALLY 6
714,286 Shares of Common Stock
OWNED BY
-----------------------------------------------------------
EACH SOLE DISPOSITIVE POWER
7
REPORTING Not Applicable
PERSON -----------------------------------------------------------
SHARED DISPOSITIVE POWER
WITH 8
714,286 Shares of Common Stock
- ------------------------------------------------------------------------------
AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
9
714,286 Shares of Common Stock
- ------------------------------------------------------------------------------
CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*
10
[_]
- ------------------------------------------------------------------------------
PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9
11
6.2%
- ------------------------------------------------------------------------------
TYPE OF REPORTING PERSON*
12
PN
- ------------------------------------------------------------------------------
*SEE INSTRUCTION BEFORE FILLING OUT!
<PAGE>
Page 13 of 19 pages
Schedule 13G
Common Stock, Par Value $.001
CUSIP No. 421963109
Item 1(a) Name of Issuer:
Heartstream, Inc.
Item 1(b) Address of Issuer's Principal Executive Offices:
2401 Fourth Avenue
Suite 300
Seattle, WA 98121
Item 2(a) Name of Person filing:
Oak Investment Partners VI, Limited Partnership
Oak Associates VI, LLC
Oak VI Affiliates Fund, Limited Partnership
Oak IV Affiliates, LLC
Oak Management Corporation
Bandel L. Carano
Gerald R. Gallagher
Edward F. Glassmeyer
Fredric W. Harman
Ann H. Lamont
Eileen M. More
Item 2(b) Address of Principal Business Office or, if none, Residence:
c/o Oak Management Corporation
One Gorham Island
Westport, CT 06880
Item 2(c) Citizenship:
Please refer to Item 4 on each cover sheet for each filing person
Item 2(d) Title of Class of Securities:
Common stock, $.001 par value
Item 2(e) CUSIP Number: 421963109
Item 3 Not Applicable.
Item 4 Ownership.
The approximate percentages of shares of Common Stock reported as
beneficially owned by the Reporting Entities is based upon 11,552,690 shares
outstanding as of October 24, 1996, as reported
<PAGE>
in the Issuer's Quarterly Report on Form 10-Q for the fiscal quarter ended
September 30, 1996.
Please see Items 5, 6, 7, 8, 9 and 11 for each cover sheet for each filing
entity.
Item 5 Ownership of Five Percent or Less of a Class.
Not applicable
Item 6 Ownership of More than Five Percent on Behalf of Another Person.
Not applicable
Item 7 Identification and Classification of the Subsidiary Which
Acquired the Security Being Reported on By the Parent Holding
Company.
Not applicable
Item 8 Identification and Classification of Members of the Group.
Not applicable
Item 9 Notice of Dissolution of Group.
Not applicable
Item 10 Certification.
Not applicable
<PAGE>
Signature
- ---------
After reasonable inquiry and to the best of my knowledge and belief, I
certify that the information set forth in this statement is true, complete and
correct.
Dated February 13, 1997
Oak Investment Partners VI,
Limited Partnership
By: Oak Associates VI, LLC,
As General Partner
By: /s/ Edward F. Glassmeyer
-------------------------------
Managing Member
Oak Associates VI, LLC
By: /s/ Edward F. Glassmeyer
--------------------------------
Managing Member
Oak VI Affiliates Fund, Limited
Partnership
By: Oak VI Affiliates, LLC
As General Partner
By: /s/ Edward F. Glassmeyer
-------------------------------
Managing Member
Oak VI Affiliates, LLC
By: /s/ Edward F. Glassmeyer
-------------------------------
Managing Member
<PAGE>
OAK MANAGEMENT CORPORATION
By: /s/ Edward F. Glassmeyer
------------------------------------
Name: Edward F. Glassmeyer
Title: President
/s/ Bandel L. Carano
-------------------------------------
Bandel L. Carano
/s/ Fredric W. Harman
-------------------------------------
Fredric W. Harman
/s/ Gerald R.Gallagher
------------------------------------
Gerald R. Gallagher
/s/ Edward F. Glassmeyer
------------------------------------
Edward F. Glassmeyer
/s/ Ann H. Lamont
------------------------------------
Ann H. Lamont
/s/ Eileen M. More
------------------------------------
Eileen M. More
<PAGE>
INDEX TO EXHIBITS
-----------------
Page
----
EXHIBIT A Agreement of Reporting Persons 18
<PAGE>
Exhibit A
---------
Each of the undersigned hereby agrees that the Schedule 13G filed on the
date hereof with respect to the shares of Common Stock of Heartstream, Inc. has
been filed on behalf of the undersigned.
Signature:
- ----------
Dated February 13, 1997
Oak Investment Partners VI,
Limited Partnership
By: Oak Associates VI, LLC,
As General Partner
By: /s/ Edward F. Glassmeyer
-------------------------------
Managing Member
Oak Associates VI, LLC
By: /s/ Edward F. Glassmeyer
--------------------------------
Managing Member
Oak VI Affiliates Fund, Limited
Partnership
By: Oak VI Affiliates, LLC
As General Partner
By: /s/ Edward F. Glassmeyer
-------------------------------
Managing Member
Oak VI Affiliates, LLC
By: /s/ Edward F. Glassmeyer
--------------------------------
Managing Member
<PAGE>
OAK MANAGEMENT CORPORATION
By: /s/ Edward F.Glassmeyer
------------------------------------
Name: Edward F. Glassmeyer
Title: President
/s/ Bandel L. Carano
------------------------------------
Bandel L. Carano
/s/ Fredric W. Harman
------------------------------------
Fredric W. Harman
/s/ Gerald R. Gallagher
------------------------------------
Gerald R. Gallagher
/s/ Edward F. Glassmeyer
------------------------------------
Edward F. Glassmeyer
/s/ Ann H. Lamont
------------------------------------
Ann H. Lamont
/s/ Eileen M. More
------------------------------------
Eileen M. More
