Blumenstock Gerald M

Track record

How each disclosed position did against the S&P ~6 months later

No positions we can measure against the market yet — outcomes appear once a disclosed buy is ~6 months old.

Disclosed positions

Estimated from their latest filings — positions may have changed since

Estimated positions from their latest filingsPro →

Activity

Open-market buy & sell volume

BuySell

Total +$0.0000 bought · −$448.7K sold

All filings on record

Every Form 4 transaction we track for this filer

All8Buys0Sells2

Stock	Transaction	Date	~6mo vs S&P
ACLSAXCELIS TECHNOLOGIES INC	Sell $177.3K · 1,161 sh	2026-05-21	—
ACLSAXCELIS TECHNOLOGIES INC	Tax $53.5K · 345 sh	2026-05-15	—
ACLSAXCELIS TECHNOLOGIES INC	Tax $115.5K · 744 sh	2026-05-15	—
ACLSAXCELIS TECHNOLOGIES INC	Grant — · 2,725 sh	2026-05-15	—
ACLSAXCELIS TECHNOLOGIES INC	Grant — · 2,725 sh	2026-05-15	—
ACLSAXCELIS TECHNOLOGIES INC	Tax $97.1K · 1,121 sh	2026-03-02	—
ACLSAXCELIS TECHNOLOGIES INC	Sell $271.4K · 3,034 sh	2025-12-11	—
ACLSAXCELIS TECHNOLOGIES INC	Tax $34.9K · 506 sh	2025-06-16	—

ACLSSell

2026-05-21 · AXCELIS TECHNOLOGIES INC

$177.3K

—

ACLSTax

2026-05-15 · AXCELIS TECHNOLOGIES INC

$53.5K

—

ACLSTax

2026-05-15 · AXCELIS TECHNOLOGIES INC

$115.5K

—

ACLSGrant

2026-05-15 · AXCELIS TECHNOLOGIES INC

2,725

—

ACLSGrant

2026-05-15 · AXCELIS TECHNOLOGIES INC

2,725

—

ACLSTax

2026-03-02 · AXCELIS TECHNOLOGIES INC

$97.1K

—

ACLSSell

2025-12-11 · AXCELIS TECHNOLOGIES INC

$271.4K

—

ACLSTax

2025-06-16 · AXCELIS TECHNOLOGIES INC

$34.9K

—

8 filings·Every Form 4 on record, with outcomesPro →

Filing in the same companies

Other insiders active in these names in the last 3 years

SN

Sayiner Necip

ACLS · last 2026-06-03

EE

Evans Eileen

ACLS · last 2026-05-22

TC

Tatnall Christopher

ACLS · last 2026-05-20

GG

Graves Gregory B

ACLS · last 2026-05-19

KJ

Kurtzweil John T

ACLS · last 2026-05-19

QJ

Quirk Jeanne

ACLS · last 2026-05-19

Outcomes measure each position — the first buy in a stock and every buy within 182 days — against the closing price ~6 months (120 trading days) later, with the S&P 500 over the same span for context. Pre-scheduled 10b5-1 plan trades are excluded from the record. Positions are estimated from the latest reported post-transaction holdings, split-adjusted, at the latest close. Built from SEC Form 4 filings and market prices — past outcomes, not predictions or advice.