The S&P MIDCAP 400 fund is an exchange traded fund (ETF) within the SPDR family. There are at least 30 funds that are incredibly highly correlated with MDY.

Within the SPDR family of funds, the most positively correlated other funds are S&P 600 Small Cap, S&P 400 Mid Cap Growth, Russell Small Cap Completeness, S&P 600 Small Cap Value, Barclays Convertible Securities.

Outside of the SPDR family, the most positively correlated other funds are iShares - Core S&P Mid-Cap ETF, Schwab - Mid-Cap Core, Vanguard Mutual Funds - Small-Cap Index Admiral Shares, Fidelity - Spartan Mid-Cap Index Fund - Investor Class , Fidelity - Spartan Mid-Cap Index Fund - Fidelity Advantage Class .

Extremely Similar Funds

There are multiple other funds which have extremely high correlation to SPDR's S&P MIDCAP 400 fund.
100.0% IJH iShares Core S&P Mid-Cap ETF
99.9% SCHM Schwab Mid-Cap Core
99.9% VSMAX Vanguard Mutual Funds Small-Cap Index Admiral Shares
99.9% FSCLX Fidelity Spartan Mid-Cap Index Fund - Investor Class
99.9% FSCKX Fidelity Spartan Mid-Cap Index Fund - Fidelity Advantage Class
99.9% VB Vanguard Small-Cap
99.8% VXF Vanguard Extended Market
99.8% IWR iShares Russell Mid-Cap ETF
99.8% FSEVX Fidelity Spartan Extended Market Index Fund - Fidelity Advantage Class
99.8% VTMSX Vanguard Mutual Funds Tax-Managed Small-Cap Admiral Shares
99.8% SLY SPDR S&P 600 Small Cap
99.8% IJT iShares S&P Small-Cap 600 Growth ETF
99.8% IWP iShares Russell Mid-Cap Growth ETF
99.8% VIMAX Vanguard Mutual Funds Mid-Cap Index Admiral Shares
99.8% VMVAX Vanguard Mutual Funds Mid-Cap Value Index Admiral
99.8% VEXAX Vanguard Mutual Funds Extended Market Index Admiral Shares
99.8% MDYG SPDR S&P 400 Mid Cap Growth
99.8% AOA iShares Aggressive Allocation ETF
99.8% JKG iShares Morningstar Mid-Cap ETF
99.8% IJR iShares Core S&P Small-Cap ETF
99.7% VFFVX Vanguard Mutual Funds Target Retirement 2055
99.7% VO Vanguard Mid-Cap
99.7% RSCO SPDR Russell Small Cap Completeness
99.7% VBK Vanguard Small-Cap Growth
99.7% IJJ iShares S&P Mid-Cap 400 Value ETF
99.7% SCHA Schwab Small-Cap Core
99.7% AOR iShares Growth Allocation ETF
99.6% EUSA iShares MSCI USA ETF
99.6% VEVFX Vanguard Mutual Funds Explorer Value
99.6% SCHB Schwab Multi-Cap Core

Performance for the previous 2 years


Positively Correlated SPDR ETFs
SLY SPDR S&P 600 Small Cap 99.8%
MDYG SPDR S&P 400 Mid Cap Growth 99.8%
RSCO SPDR Russell Small Cap Completeness 99.7%
SLYV SPDR S&P 600 Small Cap Value 99.5%
CWB SPDR Barclays Convertible Securities 99.4%
Negatively Correlated SPDR funds
RBL SPDR S&P Russia -70.9%
EDIV SPDR S&P Emerging Markets Dividend -70.0%
KME SPDR S&P Mortgage Finance -57.7%
GNR SPDR S&P Global Natural Resources -49.3%
VRD SPDR Nuveen S&P VRDO Municipal Bond -47.2%

Positively Correlated Non-SPDR funds
IJH iShares Core S&P Mid-Cap ETF 100.0%
SCHM Schwab Mid-Cap Core 99.9%
VSMAX Vanguard Mutual Funds Small-Cap Index Admiral Shares 99.9%
FSCLX Fidelity Spartan Mid-Cap Index Fund - Investor Class 99.9%
FSCKX Fidelity Spartan Mid-Cap Index Fund - Fidelity Advantage Class 99.9%
Negatively Correlated Non-SPDR funds
RING iShares MSCI Global Gold Miners ETF -88.8%
SLVP iShares MSCI Global Silver Miners ETF -86.6%
EWZS iShares MSCI Brazil Small-Cap ETF -80.4%
ERUS iShares MSCI Russia Capped ETF -76.1%
EMEY iShares MSCI Emerging Markets Energy Capped ETF -75.3%

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