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MICHAEL A ZASLOFF

CIK 1033511 · last filed 2026-06-03

MICHAEL A ZASLOFF is a corporate insider who has filed 31 SEC Form 4 insider transactions across 1 company since 2014. The most recent filing, for AMPH, was dated Jun 3, 2026. Across all open-market trades the lifetime net is −$7.4M, making them a net seller over the disclosed history. Current disclosed insider exposure totals $873.1K across reported positions.

"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

$873.1K

Companies

1

Total Filings

31

Lifetime Open-Market Net

-$7.38M

Filer Profile

Reported Address
C/O AMPHASTAR PHARMACEUTICALS, INC.
11570 6TH STREET
RANCHO CUCAMONGA, CA 91730
State of Incorporation
PA
Formerly Known As
ZEALOFF MICHAEL A (1997–1999)
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
AMPH Director 37,667 $23.18 $873.1K -$7.38M 28 2026-06-03

Recent Filings

31 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
2026-06-03 AMPH Grant (A) +8,143 $0 EDGAR
2025-06-04 AMPH Grant (A) +5,122 $0 EDGAR
2024-06-05 AMPH Grant (A) +3,076 $0 EDGAR
2024-03-06 AMPH Sell (S) −12,500 -$589.7K EDGAR
2024-03-05 AMPH Notice (144) −12,500 -$575.0K EDGAR
2023-08-16 AMPH Sell (S) −12,759 -$730.0K EDGAR
2023-08-15 AMPH Notice (144) −12,759 -$689.9K EDGAR
2023-06-07 AMPH Grant (A) +2,716 $0 EDGAR
2023-05-16 AMPH Sell (S) −7,500 -$316.3K EDGAR
2023-05-15 AMPH Notice (144) −7,500 -$312.1K EDGAR
Showing 1–10 of 31
Page 1 of 4
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.