Teradyne (TER) had the highest return in June 1994 by a large-cap US stock, returning 19.8%.

ASSET	MONTH	% RETURN
Teradyne (TER)	June 1994	19.78%
Gold Fields Ltd ADR (GFI)	June 1994	19.63%
Roper Technologies (ROP)	June 1994	16.67%
Martin Marietta Materials (MLM)	June 1994	14.29%
Gartner (IT)	June 1994	14.02%
Cadence Design Systems (CDNS)	June 1994	13.55%
Jacobs Solutions (J)	June 1994	13.1%
Costco Wholesale (COST)	June 1994	12.74%
Microchip Technology (MCHP)	June 1994	11.91%
Altria (MO)	June 1994	11.27%
Constellation Brands Inc Class A (STZ)	June 1994	11.11%
Viatris (VTRS)	June 1994	11.09%
Dover (DOV)	June 1994	11.09%
Halliburton (HAL)	June 1994	11.07%
Clean Harbors (CLH)	June 1994	10.71%
Oracle (ORCL)	June 1994	9.89%
Gilead Sciences (GILD)	June 1994	9.65%
Tyson Foods (TSN)	June 1994	9.36%
Toyota Motor Corporation ADR (TM)	June 1994	8.94%
Lowe's Companies (LOW)	June 1994	8.73%
Ross Stores (ROST)	June 1994	8.73%
AstraZeneca PLC ADR (AZN)	June 1994	8.53%
Becton Dickinson and (BDX)	June 1994	8.46%
Laboratory Corporation of America (LH)	June 1994	8.33%
Ametek (AME)	June 1994	7.72%

Large-cap stocks are treated as having a market cap of $10B+.