Sec Form 4 Filing - VECTOR CAPITAL, L.L.C. @ Cambium Networks Corp - 2021-06-11

FORM 4 Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person VECTOR CAPITAL, L.L.C. 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) (Last) (First) (Middle) C/O VECTOR CAPITAL MANAGEMENT, L.P.,, ONE MARKET STREET, STEUART TOWER, 23RD F 3. Date of Earliest Transaction (MM/DD/YY) 06/11/2021 (Street) SAN FRANCISCO, CA94105 4. If Amendment, Date Original Filed (MM/DD/YY) 6. Individual or Joint/Group Filing (Check Applicable Line) __ X __ Form filed by One Reporting Person _____ Form filed by More than One Reporting Person (City) (State) (Zip)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned 1.Title of Security (Instr. 3) 2. Transaction Date (MM/DD/YY) 2A. Deemed Execution Date, if any (MM/DD/YY) 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 06/11/2021 J( 1 ) 184,058 ( 1 ) D $ 0 12,720,696 I ( 2 ) ( 6 ) See footnotes ( 2 ) ( 6 ) Ordinary Shares 1,482,000 I ( 3 ) ( 6 ) See footnotes ( 3 ) ( 6 ) Ordinary Shares 18,000 I ( 4 ) ( 6 ) See footnotes ( 4 ) ( 6 ) Ordinary Shares 105,000 I ( 5 ) ( 6 ) See footnotes ( 5 ) ( 6 )

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 (MM/DD/YY) 3A. Deemed Execution Date, if any (MM/DD/YY) 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 (MM/DD/YY) 7. Title and Amount of Underlying Securities (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 of Derivative Security: 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

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other VECTOR CAPITAL, L.L.C. C/O VECTOR CAPITAL MANAGEMENT, L.P., ONE MARKET STREET, STEUART TOWER, 23RD F SAN FRANCISCO, CA94105 X X Signatures /s/ Vector Cambium Holdings (Cayman) L.P., by Vector Capital Partners IV, L.P., by Vector Capital, Ltd., by David Baylor, Director 06/15/2021 Signature of Reporting Person Date /s/ Vector Capital IV, L.P., by Vector Capital Partners IV, L.P., by Vector Capital, Ltd., by David Baylor, Director 06/15/2021 Signature of Reporting Person Date /s/ Vector Entrepreneur Fund III, LP, by Vector Capital Partners III, L.P., by Vector Capital, Ltd., by David Baylor, Director 06/15/2021 Signature of Reporting Person Date /s/ Vector Capital Partners IV, L.P., by Vector Capital, Ltd., by David Baylor, Director 06/15/2021 Signature of Reporting Person Date /s/ Vector Capital Partners III, L.P., by Vector Capital, Ltd., by David Baylor, Director 06/15/2021 Signature of Reporting Person Date /s/ Vector Capital, Ltd., by David Baylor, Director 06/15/2021 Signature of Reporting Person Date /s/ Vector Capital, L.L.C., by David Baylor, Chief Operating Officer 06/15/2021 Signature of Reporting Person Date

Explanation of Responses:

( 1 )These Ordinary Shares were distributed in kind by Vector Cambium Holdings (Cayman), L.P. ("VCH") to certain ultimate limited partners, in lieu of cash distributions. ( 2 )These Ordinary Shares are held directly by VCH. ( 3 )These Ordinary Shares are directly owned by Vector Capital IV, L.P. ("VC IV"). ( 4 )These Ordinary Shares are directly owned by Vector Entrepreneur Fund III, LP ("VEF III"). ( 5 )These Ordinary Shares are directly owned by Vector Capital Partners IV, L.P. ("VCP IV"). ( 6 )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 Ordinary Shares held by each of VCH, VC IV and VEF III and therefore holds indirect voting and dispositive power over the Ordinary Shares held by each of VCH, VC IV and VEF III and may be deemed to be the beneficial owner of such Ordinary Shares.

Remarks: Each of Alexander R. Slusky, the Chief Investment Officer of Vector Capital Management, L.P., and Robert Amen, a Managing Director of Vector Capital Management, L.P., serves on the Issuer's board of directors ("Board") as a representative of Vector Capital. By virtue of their representation on the Board, for purposes of Section 16 of the Securities Exchange Act of 1934, as amended, the Reporting Persons are deemed to be directors of the Issuer by deputization.

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).

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