Insider transactions

Richard Belluzzo

CIK 1204925 · Chief Executive Officer · last filed 2026-05-04

"Disclosed insider exposure" sums this person's most-recently-reported share counts across each company they're an insider in, multiplied by the current underlying price. It is not net worth — it misses retail holdings, private investments, real estate, index funds, and any company where the person isn't an SEC-reporting insider. For informational purposes only.

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Disclosed Exposure
$5.62M
Companies
5
Total Filings
138
Lifetime Open-Market Net
-$13.10M

Charts

Trading activity, where the exposure sits, and each trade against the stock price.

QTM price and trades

Daily close with each Form 4 filing on this company marked: green = open-market buy, red = open-market sale, purple = grants, exercises, gifts and other non-market transactions. Marker size scales with the dollar value.

Shares held

Shares owned after each reported transaction on this company (direct holdings as reported).

Open-market buying and selling

by month

Dollar value of open-market purchases (code P, up) and sales (code S, down) across all companies, by filing month. Grants, exercises and gifts are excluded.

Exposure by company

latest
OfficerDirector10% owner* stale (no filing in 3 yrs)

Most recently reported shares × current price. Faded bars (*) have had no filing in 3 years, so the person may no longer hold them. Click a bar to chart that company.

Filer Profile

Reported Address
C/O QUANTUM CORP
501 SYCAORE DR
MILPITAS, CA 95035
Related Filers
VIAVI SOLUTIONS INC. — 84 joint filings, latest 2026-05-04
Profile details as reported on the filer's SEC submissions — for individual insiders the address is often in care of the issuer. Related filers are identified from jointly filed SEC submissions and shared reported addresses. View filings on SEC EDGAR.

Holdings By Company

Latest on-record share count from this person's most recent non-derivative Form 4 transaction in each company. Disclosed exposure = shares × current underlying price.
Symbol Role Shares Price Disclosed Exposure Lifetime OM Net Filings Latest Filed
VIAV Director 160,740 $33.38 $5.37M -$4.74M 45 2026-05-04
PMC SIERRA INC (PMCS) Delisted Director 0 — — -$2.85M 19 2016-01-19
BLOX Director 22,500 $11.52 $259.1K $0 4 2015-12-18
VIAVI SOLUTIONS INC. (JDSU) Delisted Director 58,963 — — -$228.3K 25 2014-12-10
QUANTUM CORP /DE/ (QTM) Delisted Director 73,009 — — -$5.29M 35 2012-08-16

Recent Filings · Page 12 of 14

138 filings
Insider activity across all companies, newest first. Form 4 rows are post-trade confirmations (buys, sells, grants, exercises). Notice (144) rows are pre-trade notices of intent to sell restricted or control stock under Rule 144 — they may not all execute. Compare adjacent dates to see which notices became actual sales.
Filed Symbol Action Net Shares Net $ Link
2010-11-16 VIAVI SOLUTIONS INC. (JDSU) Delisted Exer (M) +12,231 $0 EDGAR
2010-08-12 QUANTUM CORP /DE/ (QTM) Delisted Buy (P) +100,000 $114.0K EDGAR
2010-08-02 QUANTUM CORP /DE/ (QTM) Delisted Tax (F) −97,814 -$156.5K EDGAR
2010-07-01 QUANTUM CORP /DE/ (QTM) Delisted Mixed +600,656 -$54.6K EDGAR
2010-06-03 PMC SIERRA INC (PMCS) Delisted Grant (A) — $0 EDGAR
2010-06-02 QUANTUM CORP /DE/ (QTM) Delisted Tax (F) −18,340 -$41.8K EDGAR
2010-05-27 PMC SIERRA INC (PMCS) Delisted Grant (A) +4,969 $0 EDGAR
2009-11-18 VIAVI SOLUTIONS INC. (JDSU) Delisted Exer (M) +1,001 $0 EDGAR
2009-11-17 VIAVI SOLUTIONS INC. (JDSU) Delisted Exer (M) +6,791 $0 EDGAR
2009-11-16 VIAVI SOLUTIONS INC. (JDSU) Delisted Grant (A) — $0 EDGAR
Showing 111–120 of 138
Page 12 of 14
Form 4 codes: P = open-market purchase · S = open-market sale · A = grant/award · M = option exercise · F = tax withholding at vest · G = bona-fide gift · D = disposition to issuer · J = other (see filing footnote). Only P / S codes carry directional signal.
Notice (144 / 144/A): Form 144 is a notice of intent to sell restricted/control stock under Rule 144, filed before the sale; 144/A is an amendment. Many notices are pre-scheduled under Rule 10b5-1 plans. A Form 4 with code S typically follows within a few days when the planned sale executes; missing follow-up Form 4s suggest the notice was cancelled or modified.