Simplex Trading Portfolio holdings
Simplex Trading, founded in 2004 and headquartered in Chicago, Illinois, is a technology-driven proprietary trading firm specializing in market-making and liquidity provision, primarily in U.S. equity options and futures options. Leveraging advanced proprietary software and data-driven analysis, the firm optimizes trading strategies and develops innovative solutions to capitalize on financial market opportunities, maintaining a competitive edge through automation and a collaborative team of technologists and traders. With a workforce exceeding 300 and led by CEO Erik Swanson since 2014, Simplex operates with a low-ego, high-intelligence culture, focusing on minimal bureaucracy and rapid execution, while also making strategic venture capital investments in fintech startups. Recognized as a top workplace in Chicago by Built In’s 2025 awards, Simplex continues to evolve, blending cutting-edge technology with a commitment to market efficiency and growth.
Top Buys
| 1 |
Microsoft
MSFT
|
$101M |
| 2 |
NVIDIA
NVDA
|
$66M |
| 3 |
Citigroup
C
|
$51.8M |
| 4 |
Berkshire Hathaway Class B
BRK.B
|
$42.7M |
| 5 |
SPDR Gold Trust
GLD
|
$39.4M |
Top Sells
| 1 |
Apple
AAPL
|
$411M |
| 2 |
Vanguard S&P 500 ETF
VOO
|
$64M |
| 3 |
Meta Platforms (Facebook)
META
|
$39.8M |
| 4 |
iShares Core S&P 500 ETF
IVV
|
$34.3M |
| 5 |
PayPal
PYPL
|
$32.9M |
Sector Composition
| 1 | Technology | 17.4% |
| 2 | Financials | 12.04% |
| 3 | Consumer Discretionary | 10.17% |
| 4 | Healthcare | 8.63% |
| 5 | Industrials | 6.03% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Shares Change % | Capital Flow | |
|---|---|---|---|---|---|---|
101
Prologis
PLD
$103B
| $5.06M | 0.01% |
+49,794
| New | +$5.06M |
|
102
Lumen
LUMN
$4.84B
| $5.03M | 0.01% |
+690,960
| New | +$5.03M |
|
103
SPDR S&P MidCap 400 ETF Trust
MDY
$23.6B
| $5M | 0.01% |
12,460
-4,437
| -26% | -$1.78M |
|
104
Lam Research
LRCX
$124B
| $5M | 0.01% |
13,653
+3,163
| +30% | +$1.16M |
|
105
Moderna
MRNA
$9.36B
| $4.99M | 0.01% |
42,209
-38,828
| -48% | -$4.59M |
|
106
CVS Health
CVS
$93B
| $4.96M | 0.01% |
+51,984
| New | +$4.96M |
|
107
W.W. Grainger
GWW
$48.7B
| $4.83M | 0.01% |
9,864
+3,899
| +65% | +$1.91M |
|
108
iShares MSCI Canada ETF
EWC
$3.22B
| $4.73M | 0.01% |
+153,920
| New | +$4.73M |
|
109
Li Auto
LI
$24.4B
| $4.73M | 0.01% |
205,480
+21,077
| +11% | +$485K |
|
110
Materials Select Sector SPDR Fund
XLB
$5.46B
| $4.67M | 0.01% |
68,673
+41,020
| +148% | +$2.79M |
|
111
iShares MSCI Japan ETF
EWJ
$15.2B
| $4.66M | 0.01% |
+95,440
| New | +$4.66M |
|
112
Novartis
NVS
$248B
| $4.63M | 0.01% |
60,959
+36,194
| +146% | +$2.75M |
|
113
JD.com
JD
$44.2B
| $4.37M | ﹤0.01% |
+86,960
| New | +$4.37M |
|
114
Bank of New York Mellon
BK
$73.8B
| $4.33M | ﹤0.01% |
112,448
+68,809
| +158% | +$2.65M |
|
115
Ryder
R
$7.59B
| $4.33M | ﹤0.01% |
57,334
+44,260
| +339% | +$3.34M |
|
116
Kohl's
KSS
$1.78B
| $4.31M | ﹤0.01% |
171,483
+162,096
| +1,727% | +$4.08M |
|
117
ProShares UltraPro S&P 500
UPRO
$4.43B
| $4.25M | ﹤0.01% |
+149,639
| New | +$4.25M |
|
|
WBA
118
DELISTED
Walgreens Boots Alliance
WBA
| $4.23M | ﹤0.01% |
134,749
-31,197
| -19% | -$980K |
|
119
Blackrock
BLK
$170B
| $4.21M | ﹤0.01% |
7,647
-1,473
| -16% | -$810K |
|
120
Visa
V
$681B
| $4.2M | ﹤0.01% |
23,651
-147,859
| -86% | -$26.3M |
|
121
iShares MSCI ACWI ETF
ACWI
$22B
| $4.11M | ﹤0.01% |
52,870
+33,322
| +170% | +$2.59M |
|
122
SoFi Technologies
SOFI
$29.3B
| $4.09M | ﹤0.01% |
838,606
+837,746
| +97,412% | +$4.09M |
|
123
Clorox
CLX
$15B
| $4.09M | ﹤0.01% |
31,874
+7,541
| +31% | +$968K |
|
124
Mastercard
MA
$536B
| $4.04M | ﹤0.01% |
14,211
+11,374
| +401% | +$3.23M |
|
125
Guardant Health
GH
$8.11B
| $4M | ﹤0.01% |
74,317
+53,451
| +256% | +$2.88M |
|