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 | +$216M | |
| 2 | +$159M | |
| 3 | +$128M | |
| 4 |
Booking.com
BKNG
|
+$62.2M |
| 5 |
SPDR S&P 500 ETF Trust
SPY
|
+$61.9M |
Top Sells
| 1 | +$141M | |
| 2 | +$53.1M | |
| 3 | +$45.7M | |
| 4 |
Netflix
NFLX
|
+$45.3M |
| 5 |
Pfizer
PFE
|
+$38.3M |
Sector Composition
| 1 | Technology | 34.74% |
| 2 | Communication Services | 9% |
| 3 | Consumer Discretionary | 8.67% |
| 4 | Healthcare | 8.07% |
| 5 | Financials | 6.38% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
926
Ultra Clean Holdings
UCTT
$1.11B
| $200K | ﹤0.01% |
8,889
-1,372
|
|
||
927
Solid Power
SLDP
$1.12B
| $199K | ﹤0.01% |
91,130
+62,853
|
|
||
928
BuzzFeed
BZFD
$36.4M
| $198K | ﹤0.01% |
99,000
+45,238
|
|
||
929
International Paper
IP
$20B
| $198K | ﹤0.01% |
+4,232
|
|
||
930
TXO Partners LP
TXO
$759M
| $198K | ﹤0.01% |
+13,192
|
|
||
931
Gevo
GEVO
$485M
| $197K | ﹤0.01% |
149,533
+143,897
|
|
||
932
Sun Communities
SUI
$15.5B
| $197K | ﹤0.01% |
1,560
+1,050
|
|
||
|
CRESY
933
Cresud
CRESY
$720M
| $196K | ﹤0.01% |
18,303
-626
|
|
||
934
CryoPort
CYRX
$439M
| $195K | ﹤0.01% |
26,254
+22,811
|
|
||
935
Petrobras
PBR
$84B
| $195K | ﹤0.01% |
15,660
-468,283
|
|
||
936
iShares 10-20 Year Treasury Bond ETF
TLH
$12.4B
| $195K | ﹤0.01% |
+1,922
|
|
||
937
VEON
VEON
$3.35B
| $195K | ﹤0.01% |
4,247
-384
|
|
||
938
Tandem Diabetes Care
TNDM
$1.19B
| $194K | ﹤0.01% |
10,434
+8,931
|
|
||
939
Geron
GERN
$734M
| $193K | ﹤0.01% |
137,408
-52,613
|
|
||
940
Lear
LEA
$5.59B
| $193K | ﹤0.01% |
+2,040
|
|
||
941
Precigen
PGEN
$1.36B
| $193K | ﹤0.01% |
136,232
+105,814
|
|
||
942
CONMED
CNMD
$1.34B
| $192K | ﹤0.01% |
3,687
-3,278
|
|
||
943
Shoals Technologies Group
SHLS
$1.35B
| $192K | ﹤0.01% |
45,360
+33,059
|
|
||
|
ETHT
944
ProShares Ultra Ether ETF
ETHT
$295M
| $192K | ﹤0.01% |
4,885
+4,586
|
|
||
945
IES Holdings
IESC
$7.12B
| $191K | ﹤0.01% |
+645
|
|
||
946
Harmony Gold Mining
HMY
$11.1B
| $190K | ﹤0.01% |
+13,663
|
|
||
947
iShares Latin America 40 ETF
ILF
$2.01B
| $190K | ﹤0.01% |
7,279
+5,206
|
|
||
948
Blink Charging
BLNK
$167M
| $189K | ﹤0.01% |
201,900
-14,930
|
|
||
949
Spire Global
SPIR
$251M
| $189K | ﹤0.01% |
15,890
+7,318
|
|
||
950
Acuity Brands
AYI
$10.8B
| $188K | ﹤0.01% |
+633
|
|