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 |
Alphabet (Google) Class C
GOOG
|
+$41.4M |
| 2 |
Berkshire Hathaway Class B
BRK.B
|
+$12.3M |
| 3 |
SPDR S&P 500 ETF Trust
SPY
|
+$9.89M |
| 4 |
Alibaba
BABA
|
+$9.66M |
| 5 |
Intel
INTC
|
+$9.11M |
Top Sells
| 1 |
Apple
AAPL
|
+$36.8M |
| 2 |
Gilead Sciences
GILD
|
+$31.2M |
| 3 |
Booking.com
BKNG
|
+$29M |
| 4 |
Amazon
AMZN
|
+$25.6M |
| 5 |
Baidu
BIDU
|
+$12.9M |
Sector Composition
| 1 | Communication Services | 13.31% |
| 2 | Consumer Discretionary | 13.07% |
| 3 | Healthcare | 12.41% |
| 4 | Technology | 11.91% |
| 5 | Financials | 8.28% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Shares Change % | Capital Flow | |
|---|---|---|---|---|---|---|
976
iShares Russell 3000 ETF
IWV
$16.9B
| $30K | ﹤0.01% |
243
+138
| +131% | +$17K |
|
977
Manulife Financial
MFC
$52.4B
| $30K | ﹤0.01% |
+1,820
| New | +$30K |
|
978
MKS Inc. Common Stock
MKSI
$7.79B
| $30K | ﹤0.01% |
898
+832
| +1,261% | +$27.8K |
|
979
NNN REIT
NNN
$8.06B
| $30K | ﹤0.01% |
+741
| New | +$30K |
|
980
Voya Financial
VOYA
$7.3B
| $30K | ﹤0.01% |
715
-810
| -53% | -$34K |
|
|
IMGN
981
DELISTED
Immunogen Inc
IMGN
| $30K | ﹤0.01% |
3,439
-5,364
| -61% | -$46.8K |
|
|
LMOS
982
DELISTED
Lumos Networks Corp
LMOS
| $30K | ﹤0.01% |
+1,976
| New | +$30K |
|
|
JKS
983
JinkoSolar
JKS
$1.26B
| $29K | ﹤0.01% |
1,150
+294
| +34% | +$7.41K |
|
984
ProAssurance
PRA
$1.22B
| $29K | ﹤0.01% |
+641
| New | +$29K |
|
985
ProShares UltraShort S&P500
SDS
$468M
| $29K | ﹤0.01% |
+69
| New | +$29K |
|
986
Steven Madden
SHOO
$2.22B
| $29K | ﹤0.01% |
+1,170
| New | +$29K |
|
987
Sociedad Química y Minera de Chile
SQM
$12B
| $29K | ﹤0.01% |
+1,659
| New | +$29K |
|
988
Suncor Energy
SU
$51.3B
| $29K | ﹤0.01% |
+1,005
| New | +$29K |
|
989
Veeco
VECO
$1.52B
| $29K | ﹤0.01% |
967
-675
| -41% | -$20.2K |
|
|
LLTC
990
DELISTED
Linear Technology Corp
LLTC
| $29K | ﹤0.01% |
+622
| New | +$29K |
|
|
STRZA
991
DELISTED
Starz - Series A
STRZA
| $29K | ﹤0.01% |
+846
| New | +$29K |
|
|
SSRI
992
DELISTED
Silver Standard Resources
SSRI
| $29K | ﹤0.01% |
6,472
+4,324
| +201% | +$19.4K |
|
|
AIV
993
Aimco
AIV
$1.07B
| $28K | ﹤0.01% |
5,472
-4,790
| -47% | -$24.5K |
|
994
Enanta Pharmaceuticals
ENTA
$178M
| $28K | ﹤0.01% |
943
-736
| -44% | -$21.9K |
|
995
Heron Therapeutics
HRTX
$195M
| $28K | ﹤0.01% |
+1,964
| New | +$28K |
|
996
Ironwood Pharmaceuticals
IRWD
$187M
| $28K | ﹤0.01% |
+2,147
| New | +$28K |
|
997
Korea Electric Power
KEP
$18.1B
| $28K | ﹤0.01% |
1,400
+737
| +111% | +$14.7K |
|
998
Light & Wonder
LNW
$7.42B
| $28K | ﹤0.01% |
2,689
-10,975
| -80% | -$114K |
|
999
VanEck Agribusiness ETF
MOO
$630M
| $28K | ﹤0.01% |
+533
| New | +$28K |
|
1000
Omega Healthcare
OHI
$12.6B
| $28K | ﹤0.01% |
707
+624
| +752% | +$24.7K |
|