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 | |
|---|---|---|---|---|---|---|
276
FMC
FMC
$1.76B
| $1.72M | ﹤0.01% |
41,127
+12,921
|
|
||
|
277
Netflix
NFLX
$492B
| $1.7M | ﹤0.01% |
1,273
-33,871
|
|
||
278
iShares 7-10 Year Treasury Bond ETF
IEF
$38.6B
| $1.68M | ﹤0.01% |
+17,500
|
|
||
279
Eastman Chemical
EMN
$7.12B
| $1.65M | ﹤0.01% |
22,108
-43,770
|
|
||
280
Polaris
PII
$3.7B
| $1.65M | ﹤0.01% |
+40,574
|
|
||
281
Domo
DOMO
$531M
| $1.64M | ﹤0.01% |
+117,638
|
|
||
282
Range Resources
RRC
$9.11B
| $1.63M | ﹤0.01% |
40,003
-81,612
|
|
||
283
Burford Capital
BUR
$1.94B
| $1.62M | ﹤0.01% |
113,807
+83,746
|
|
||
284
Schneider National
SNDR
$3.88B
| $1.6M | ﹤0.01% |
66,491
+46,939
|
|
||
|
ROBN
285
T-Rex 2X Long HOOD Daily Target ETF
ROBN
$187M
| $1.59M | ﹤0.01% |
30,331
+15,548
|
|
||
286
Brown & Brown
BRO
$27.7B
| $1.57M | ﹤0.01% |
14,209
+13,876
|
|
||
287
ZIM Integrated Shipping Services
ZIM
$1.96B
| $1.57M | ﹤0.01% |
97,939
-248,841
|
|
||
288
Bumble
BMBL
$439M
| $1.57M | ﹤0.01% |
238,846
+41,268
|
|
||
289
NetEase
NTES
$90.7B
| $1.57M | ﹤0.01% |
+11,685
|
|
||
290
ODDITY Tech
ODD
$2.3B
| $1.57M | ﹤0.01% |
20,790
-23,268
|
|
||
291
Ionis Pharmaceuticals
IONS
$11.5B
| $1.57M | ﹤0.01% |
39,638
-24,943
|
|
||
292
Alliance Resource Partners
ARLP
$3.24B
| $1.56M | ﹤0.01% |
59,724
+8,392
|
|
||
293
Align Technology
ALGN
$10.3B
| $1.54M | ﹤0.01% |
8,147
-203
|
|
||
294
Aurora
AUR
$8.24B
| $1.53M | ﹤0.01% |
292,871
+279,083
|
|
||
|
ETOR
295
eToro Group
ETOR
$3.37B
| $1.53M | ﹤0.01% |
+23,024
|
|
||
296
Global X Defense Tech ETF
SHLD
$4.2B
| $1.52M | ﹤0.01% |
+25,233
|
|
||
297
JetBlue
JBLU
$1.59B
| $1.51M | ﹤0.01% |
357,012
+236,065
|
|
||
298
Middleby
MIDD
$6.27B
| $1.5M | ﹤0.01% |
10,452
+4,807
|
|
||
299
Liquidia Corp
LQDA
$2.46B
| $1.5M | ﹤0.01% |
120,309
+41,282
|
|
||
300
UGI
UGI
$7.44B
| $1.5M | ﹤0.01% |
41,114
-4,928
|
|