Leonard S. Schleifer

Founder, REGN

Chief executive: 1988 – present · 1 source
Birth date: 7 July 1952 2 sourcesGrade C1. An official record fixes the year and month; the exact day is not yet independently verified.
Birth time: Unknown. A reading is issued only when it holds whichever hour Leonard was born.The calendar's month turned on the day Leonard was born, so the month depends on the hour: 1 of the 13 possible hours fall in the earlier month and 12 in the next. A published source for the hour would settle it. Birth hours wanted

2026 reading

Firm

1 signal, 0 drags

Read for the calendar year from the birth date, one of five levels. Signals lift it, drags lower it. The rules stay in-house.

In Leonard’s 31 years leading REGN, Firm years rose 3 of 6.

This month: November is an Active month; REGN rose last month, so no Rebound listing. This month’s lists
2027: Published 1 December 2026, sealed before the year starts.

2026 month by month

Active months are the six in which a year’s reading tends to show in the stock. A qualifying reading enters the Rebound list in an Active month that follows a month the stock did not rise. The outlined cell is this month; the move is the month’s price change.

Years in role by level

Strong: 2 of 3 rose
Firm: 3 of 6 rose
Even: 12 of 18 rose
Soft: 3 of 3 rose
Weak: 1 of 1 rose

All leaders, 1995–2025: Strong 79% of 191 · Firm 70% of 522 · Even 67% of 1,447 · Soft 54% of 220 · Weak 53% of 131.

Year by year

Every calendar year Leonard led REGN with a reading on record, and what the stock did that year. Past years are read with the rules now fixed; the return is the stock's from January to December.

REGN rose in 21 of 31 years.

A reading is odds, not a call. Years at each level that rose, all leaders, 1995–2025: Strong 79% · Firm 70% · Even 67% · Soft 54% · Weak 53%.

Leonard S. Schleifer at REGN, by year
Year	Reading	Stacked	REGN	Result
2025	Weak	0 signals, 1 drag	+9.0%	Rose
2024	Firm	1 signal, 0 drags	−18.9%	Fell
2023	Even	0 signals, 0 drags	+21.7%	Rose
2022	Soft	0 signals, 1 drag	+14.3%	Rose
2021	Even	0 signals, 0 drags	+30.7%	Rose
2020	Firm	1 signal, 0 drags	+28.7%	Rose
2019	Even	0 signals, 0 drags	+0.5%	Rose
2018	Even	0 signals, 0 drags	−0.6%	Fell
2017	Strong	2 signals, 0 drags	+2.4%	Rose
2016	Even	1 signal, 1 drag	−32.4%	Fell
2015	Even	0 signals, 0 drags	+32.3%	Rose
2014	Even	0 signals, 0 drags	+49.1%	Rose
2013	Soft	0 signals, 1 drag	+60.9%	Rose
2012	Even	0 signals, 0 drags	+208.6%	Rose
2011	Even	0 signals, 0 drags	+68.8%	Rose
2010	Soft	0 signals, 1 drag	+35.8%	Rose
2009	Even	0 signals, 0 drags	+31.7%	Rose
2008	Firm	1 signal, 0 drags	−24.0%	Fell
2007	Even	1 signal, 1 drag	+20.3%	Rose
2006	Strong	2 signals, 0 drags	+26.2%	Rose
2005	Even	0 signals, 0 drags	+72.6%	Rose
2004	Even	0 signals, 0 drags	−37.4%	Fell
2003	Firm	1 signal, 0 drags	−20.5%	Fell
2002	Strong	2 signals, 0 drags	−34.3%	Fell
2001	Even	1 signal, 1 drag	−20.1%	Fell
2000	Firm	1 signal, 0 drags	+176.6%	Rose
1999	Even	0 signals, 0 drags	+72.9%	Rose
1998	Even	0 signals, 0 drags	−13.9%	Fell
1997	Even	0 signals, 0 drags	−46.9%	Fell
1996	Firm	1 signal, 0 drags	+26.5%	Rose
1995	Even	0 signals, 1 drag	+325.0%	Rose

Returns are the calendar-year change in REGN's adjusted close from EODHD, the series the record was scored on.

Sources the birth-date audit read

Some state the whole date and some only part of it, such as a year or an age. The grade is the audit's judgement of them together, and a date is graded by its weakest part.

Chief executive dates

Leonard became chief executive, 1988sec.gov

A year counts for Leonard only when these dates make them chief executive for at least six months of it.

Readings: One of five levels a year, with how many signals and drags stacked, computed from the birth date over the thirteen possible birth hours and issued only where at least ten agree. Built 2026-11-03 from research export f165a33. The rules stay in-house.
Stock data: Calendar-year and monthly % change of adjusted close. Volatility % = annualised stdev of the 12 monthly returns. No prices are included. Adjusted close is split-adjusted, so a stock split never appears as a move in anything plotted here, and stock splits are not recorded as events.
Birth dates: 197 of the 315 people in this dataset now have at least one source recorded here, across 198 of the 321 leader-company records — six people ran two companies and are stored once for each. Of those sources — all 198 of them — 195 are a stated age read out of an SEC proxy statement, which bounds a birth year and says nothing about the day; one is an age stated in a press report; two state the day itself, one from an official gazette read by a person and one from an encyclopedia. The day is what every reading on this site is calculated from, so for all but those two birth dates no source here backs the part that is used. The 195 records the pass produced were not reviewed by a person: each source names who read it. Six findings from the same pass are deliberately not entered, because in each one the date held here falls outside the bound the filing implies, and telling an ordinary record-date lag from a real disagreement needs a person rather than arithmetic. An absent entry still means no source is recorded here yet.
Research export: Version 2, generated 2026-11-03 from research commit 7d490ef with uncommitted changes

Research and exploration only. Not investment advice. A reading describes a leader's year from their birth date, not the stock.