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 |
NVIDIA
NVDA
|
+$29.3M |
| 2 |
Industrial Select Sector SPDR Fund
XLI
|
+$23.1M |
| 3 |
iShares Russell 2000 ETF
IWM
|
+$18M |
| 4 |
Netflix
NFLX
|
+$17.4M |
| 5 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$14M |
Top Sells
| 1 |
Invesco QQQ Trust
QQQ
|
+$120M |
| 2 |
SPDR S&P 500 ETF Trust
SPY
|
+$41.3M |
| 3 |
Walt Disney
DIS
|
+$26.9M |
| 4 |
Alphabet (Google) Class A
GOOGL
|
+$13.8M |
| 5 |
Johnson & Johnson
JNJ
|
+$11.3M |
Sector Composition
| 1 | Technology | 16.22% |
| 2 | Communication Services | 16.19% |
| 3 | Healthcare | 11.36% |
| 4 | Industrials | 9.74% |
| 5 | Consumer Discretionary | 8.61% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Shares Change % | Capital Flow | |
|---|---|---|---|---|---|---|
326
RingCentral
RNG
$2.94B
| $719K | ﹤0.01% |
+6,257
| New | +$719K |
|
327
iShares MSCI Turkey ETF
TUR
$162M
| $719K | ﹤0.01% |
+30,226
| New | +$719K |
|
|
VIAB
328
DELISTED
Viacom Inc. Class B
VIAB
| $718K | ﹤0.01% |
24,067
-64,690
| -73% | -$1.93M |
|
|
CDK
329
DELISTED
CDK Global, Inc.
CDK
| $717K | ﹤0.01% |
+14,504
| New | +$717K |
|
330
Ares Capital
ARCC
$15.7B
| $714K | ﹤0.01% |
+39,824
| New | +$714K |
|
331
Wells Fargo
WFC
$259B
| $712K | ﹤0.01% |
15,057
-16,514
| -52% | -$781K |
|
332
Stratasys
SSYS
$861M
| $711K | ﹤0.01% |
+24,240
| New | +$711K |
|
333
Zillow
Z
$21.1B
| $705K | ﹤0.01% |
+15,206
| New | +$705K |
|
|
MNDT
334
DELISTED
Mandiant, Inc. Common Stock
MNDT
| $705K | ﹤0.01% |
+47,633
| New | +$705K |
|
335
Neurocrine Biosciences
NBIX
$14.3B
| $702K | ﹤0.01% |
8,326
+1,103
| +15% | +$93K |
|
336
Bread Financial
BFH
$3.06B
| $698K | ﹤0.01% |
6,249
-2,878
| -32% | -$321K |
|
337
Penumbra
PEN
$11.1B
| $698K | ﹤0.01% |
4,366
-7,859
| -64% | -$1.26M |
|
338
Albemarle
ALB
$8.54B
| $695K | ﹤0.01% |
9,877
+1,984
| +25% | +$140K |
|
339
Avis
CAR
$5.56B
| $693K | ﹤0.01% |
19,721
-11,711
| -37% | -$412K |
|
340
Infosys
INFY
$70.5B
| $690K | ﹤0.01% |
64,543
+11,336
| +21% | +$121K |
|
341
Moderna
MRNA
$9.52B
| $690K | ﹤0.01% |
47,138
+32,760
| +228% | +$480K |
|
|
JO
342
DELISTED
iPath Series B Bloomberg Coffee Subindex Total ReturnSM ETN
JO
| $689K | ﹤0.01% |
18,334
+12,684
| +224% | +$477K |
|
343
Alerian MLP ETF
AMLP
$10.5B
| $688K | ﹤0.01% |
13,978
+8,796
| +170% | +$433K |
|
344
Louisiana-Pacific
LPX
$6.91B
| $688K | ﹤0.01% |
26,243
+10,867
| +71% | +$285K |
|
345
The Greenbrier Companies
GBX
$1.43B
| $684K | ﹤0.01% |
+22,511
| New | +$684K |
|
346
Ambarella
AMBA
$3.61B
| $683K | ﹤0.01% |
15,488
+12,428
| +406% | +$548K |
|
347
J.M. Smucker
SJM
$11.8B
| $670K | ﹤0.01% |
+5,825
| New | +$670K |
|
348
Bausch Health
BHC
$2.67B
| $669K | ﹤0.01% |
+26,545
| New | +$669K |
|
349
Mercury Systems
MRCY
$4.12B
| $669K | ﹤0.01% |
9,517
+3,529
| +59% | +$248K |
|
350
Crocs
CROX
$4.55B
| $668K | ﹤0.01% |
+33,851
| New | +$668K |
|