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 |
Goldman Sachs
GS
|
+$38.4M |
| 2 |
Micron Technology
MU
|
+$23.7M |
| 3 |
NVIDIA
NVDA
|
+$23.6M |
| 4 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$21.7M |
| 5 |
Wells Fargo
WFC
|
+$20.4M |
Top Sells
| 1 |
Citigroup
C
|
+$21.6M |
| 2 |
Apple
AAPL
|
+$17.2M |
| 3 |
Invesco QQQ Trust
QQQ
|
+$13.3M |
| 4 |
Eli Lilly
LLY
|
+$9.69M |
| 5 |
Mastercard
MA
|
+$8.27M |
Sector Composition
| 1 | Technology | 14.2% |
| 2 | Communication Services | 13.46% |
| 3 | Consumer Discretionary | 12.76% |
| 4 | Healthcare | 12.43% |
| 5 | Financials | 10.75% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Shares Change % | Capital Flow | |
|---|---|---|---|---|---|---|
676
Comtech Telecommunications
CMTL
$73.5M
| $219K | 0.01% |
+14,908
| New | +$219K |
|
677
Zillow
ZG
$20.8B
| $219K | 0.01% |
+6,480
| New | +$219K |
|
678
Ericsson
ERIC
$26.9B
| $217K | 0.01% |
+32,812
| New | +$217K |
|
679
RLJ Lodging Trust
RLJ
$1.16B
| $217K | 0.01% |
+9,268
| New | +$217K |
|
680
VeriSign
VRSN
$26.9B
| $217K | 0.01% |
2,499
+1,229
| +97% | +$107K |
|
|
DNO
681
DELISTED
United States Short Oil Fund
DNO
| $217K | 0.01% |
3,236
+2,756
| +574% | +$185K |
|
682
Inogen
INGN
$235M
| $216K | 0.01% |
+2,792
| New | +$216K |
|
683
3D Systems Corporation
DDD
$318M
| $215K | 0.01% |
+14,434
| New | +$215K |
|
|
LLL
684
DELISTED
L3 Technologies, Inc.
LLL
| $215K | 0.01% |
1,304
-7,979
| -86% | -$1.32M |
|
|
RMP
685
DELISTED
Rice Midstream Partners LP
RMP
| $215K | 0.01% |
8,556
+7,767
| +984% | +$195K |
|
686
eHealth
EHTH
$120M
| $214K | 0.01% |
17,789
+2,365
| +15% | +$28.5K |
|
687
Amicus Therapeutics
FOLD
$2.57B
| $214K | 0.01% |
+30,131
| New | +$214K |
|
688
Openlane
KAR
$3.12B
| $214K | 0.01% |
12,975
+11,271
| +661% | +$186K |
|
689
Mercado Libre
MELI
$127B
| $214K | 0.01% |
+1,014
| New | +$214K |
|
690
Penumbra
PEN
$9.91B
| $214K | 0.01% |
2,565
+265
| +12% | +$22.1K |
|
|
ONCE
691
DELISTED
Spark Therapeutics, Inc. Common Stock
ONCE
| $212K | 0.01% |
3,986
+3,857
| +2,990% | +$205K |
|
|
APLP
692
DELISTED
Archrock Partners, L.P. Common Units representing Limited Partner Interests
APLP
| $212K | 0.01% |
12,392
+10,582
| +585% | +$181K |
|
|
ABCO
693
DELISTED
Advisory Board Co/The
ABCO
| $212K | 0.01% |
4,546
-1,597
| -26% | -$74.5K |
|
694
Valmont Industries
VMI
$7.5B
| $208K | 0.01% |
1,344
-808
| -38% | -$125K |
|
|
TRTN
695
DELISTED
Triton International Limited
TRTN
| $208K | 0.01% |
8,095
-6,604
| -45% | -$170K |
|
696
Archrock
AROC
$4.3B
| $207K | 0.01% |
+16,723
| New | +$207K |
|
697
Carpenter Technology
CRS
$12.2B
| $207K | 0.01% |
5,557
+5,391
| +3,248% | +$201K |
|
698
Puma Biotechnology
PBYI
$222M
| $207K | 0.01% |
+5,591
| New | +$207K |
|
|
NUVA
699
DELISTED
NuVasive, Inc.
NUVA
| $207K | 0.01% |
2,777
+2,159
| +349% | +$161K |
|
700
iShares MSCI Mexico ETF
EWW
$1.92B
| $205K | 0.01% |
4,018
-14,796
| -79% | -$755K |
|