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
|
+$54.6M |
| 2 |
iShares Russell 2000 ETF
IWM
|
+$52.5M |
| 3 |
SPDR S&P 500 ETF Trust
SPY
|
+$40.9M |
| 4 |
Apple
AAPL
|
+$16.5M |
| 5 |
Visa
V
|
+$12M |
Top Sells
| 1 |
Amazon
AMZN
|
+$98.7M |
| 2 |
Meta Platforms (Facebook)
META
|
+$70.7M |
| 3 |
Invesco QQQ Trust
QQQ
|
+$33.4M |
| 4 |
Goldman Sachs
GS
|
+$30.2M |
| 5 |
Boeing
BA
|
+$26.5M |
Sector Composition
| 1 | Communication Services | 14.71% |
| 2 | Consumer Discretionary | 14.32% |
| 3 | Technology | 11.86% |
| 4 | Financials | 7.38% |
| 5 | Industrials | 6.44% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Shares Change % | Capital Flow | |
|---|---|---|---|---|---|---|
|
MRTX
601
DELISTED
Mirati Therapeutics, Inc. Common Stock
MRTX
| $225K | ﹤0.01% |
+5,314
| New | +$225K |
|
602
Darling Ingredients
DAR
$4.95B
| $224K | ﹤0.01% |
+11,645
| New | +$224K |
|
603
VF Corp
VFC
$5.84B
| $223K | ﹤0.01% |
3,334
-3,382
| -50% | -$226K |
|
|
MRNS
604
DELISTED
Marinus Pharmaceuticals, Inc
MRNS
| $223K | ﹤0.01% |
19,466
+13,155
| +208% | +$151K |
|
605
First Trust NYSE Arca Biotechnology Index Fund
FBT
$1.07B
| $222K | ﹤0.01% |
1,789
+1,432
| +401% | +$178K |
|
|
ONC
606
BeOne Medicines Ltd. American Depositary Shares
ONC
$34.6B
| $222K | ﹤0.01% |
+1,587
| New | +$222K |
|
607
GDS Holdings
GDS
$6.46B
| $221K | ﹤0.01% |
9,572
-777
| -8% | -$17.9K |
|
608
Madison Square Garden
MSGS
$4.95B
| $221K | ﹤0.01% |
+1,161
| New | +$221K |
|
609
Penske Automotive Group
PAG
$12.1B
| $221K | ﹤0.01% |
5,490
+5,464
| +21,015% | +$220K |
|
610
Sea Limited
SE
$114B
| $221K | ﹤0.01% |
+19,579
| New | +$221K |
|
|
CVRR
611
DELISTED
CVR Refining, LP
CVRR
| $220K | ﹤0.01% |
+21,153
| New | +$220K |
|
612
Gyre Therapeutics
GYRE
$738M
| $219K | ﹤0.01% |
3,716
+3,150
| +557% | +$186K |
|
613
Hain Celestial
HAIN
$182M
| $219K | ﹤0.01% |
13,864
-26,231
| -65% | -$414K |
|
614
Valley National Bancorp
VLY
$5.99B
| $219K | ﹤0.01% |
+24,707
| New | +$219K |
|
|
TRTN
615
DELISTED
Triton International Limited
TRTN
| $219K | ﹤0.01% |
7,070
+2,120
| +43% | +$65.7K |
|
616
National Grid
NGG
$69.9B
| $216K | ﹤0.01% |
+5,039
| New | +$216K |
|
617
Prothena Corp
PRTA
$451M
| $216K | ﹤0.01% |
21,037
+874
| +4% | +$8.97K |
|
618
TopBuild
BLD
$11.7B
| $215K | ﹤0.01% |
4,787
+2,185
| +84% | +$98.1K |
|
619
Manulife Financial
MFC
$52.3B
| $215K | ﹤0.01% |
+15,153
| New | +$215K |
|
620
Ingredion
INGR
$8.06B
| $214K | ﹤0.01% |
+2,343
| New | +$214K |
|
621
Kratos Defense & Security Solutions
KTOS
$11B
| $214K | ﹤0.01% |
15,225
-18,218
| -54% | -$256K |
|
|
VNE
622
DELISTED
Veoneer, Inc.
VNE
| $214K | ﹤0.01% |
9,109
+8,685
| +2,048% | +$204K |
|
|
SWN
623
DELISTED
Southwestern Energy Company
SWN
| $213K | ﹤0.01% |
62,520
+48,077
| +333% | +$164K |
|
|
MB
624
DELISTED
MINDBODY, Inc. Class A Common Stock
MB
| $213K | ﹤0.01% |
5,868
+5,386
| +1,117% | +$196K |
|
625
StoneX
SNEX
$5.01B
| $212K | ﹤0.01% |
+13,057
| New | +$212K |
|