Washington, D.C. 20549


Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940
OMB Number: 3235-0287
Estimated average burden
hours per response: 0.5
Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).
1. Name and Address of Reporting Person*
Slusky Alexander R

(Last) (First) (Middle)


(City) (State) (Zip)
2. Issuer Name and Ticker or Trading Symbol
Cambium Networks Corp [ CMBM ]
5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
X Director X 10% Owner
Officer (give title below) Other (specify below)
3. Date of Earliest Transaction (Month/Day/Year)
4. If Amendment, Date of Original Filed (Month/Day/Year)
6. Individual or Joint/Group Filing (Check Applicable Line)
X Form filed by One Reporting Person
Form filed by More than One Reporting Person
Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3) 2. Transaction Date (Month/Day/Year) 2A. Deemed Execution Date, if any (Month/Day/Year) 3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4)
Code V Amount (A) or (D) Price
Ordinary Shares 06/28/2019 A(1) 17,627,575 A (1) 17,704,754 I(1)(4) See footnotes(1)(4)
Ordinary Shares 06/28/2019 P 1,482,000 A $12 1,482,000 I(2)(4) See footnotes(2)(4)
Ordinary Shares 06/28/2019 P 18,000 A $12 18,000 I(3)(4) See footnotes(3)(4)
Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3) 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (Month/Day/Year) 3A. Deemed Execution Date, if any (Month/Day/Year) 4. Transaction Code (Instr. 8) 5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 6. Date Exercisable and Expiration Date (Month/Day/Year) 7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4) 8. Price of Derivative Security (Instr. 5) 9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4)
Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares
Stock Option (right to buy) $12 06/28/2019 A 30,000 (5) 06/23/2029 Ordinary Shares 30,000 $0 30,000 D
Explanation of Responses:
1. In connection with the issuer's Recapitalization (as described in the issuer's prospectus dated June 25, 2019) and upon consummation of the issuer's initial public offering, Vector Cambium Holdings (Cayman), L.P. ("VCH") received these Ordinary Shares representing the amount of unreturned capital and accumulated yield payable to holders of Class A Units of VCH, plus the residual share of the issuer's value attributable to VCH's ownership after such return, based on the initial public offering price of $12.
2. These shares are directly owned by Vector Capital IV, L.P. ("VC IV").
3. These shares are directly owned by Vector Entrepreneur Fund III, LP ("VEF III").
4. Vector Capital Partners IV, L.P. ("VCP IV") is the general partner of VCH and VC IV. Vector Capital Partners III, L.P. ("VCP III") is the general partner of VEF III. Vector Capital, Ltd. and Vector Capital, L.L.C. are the general partners of each of VCP IV and VCP III. The board of directors of Vector Capital, Ltd. has the exclusive power and authority to vote, or to direct to vote, and to dispose, or to direct the disposition of, the shares held by each of VCH, VC IV and VEF III and therefore holds indirect voting and dispositive power over the shares held by each of VCH, VC IV and VEF III and may be deemed to be the beneficial owner of such shares. The Reporting Person is the Chief Investment Officer of Vector Capital Management, L.P., and disclaims beneficial ownership of such shares in excess of his pecuniary interest in such shares.
5. This option vests as follows: 25% vests on June 23, 2020, and the remaining 75% vests in 12 equal quarterly installments on a quarterly basis thereafter, subject to reporting person's continued service as of each vesting date and subject to acceleration upon certain events.
/s/ Sally Rau, attorney-in-fact 06/28/2019
** Signature of Reporting Person Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.