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 | |
|---|---|---|---|---|---|---|
501
Diamondback Energy
FANG
$40.4B
| $352K | ﹤0.01% |
3,235
-12,064
| -79% | -$1.31M |
|
|
HOME
502
DELISTED
At Home Group Inc.
HOME
| $352K | ﹤0.01% |
52,892
-80,785
| -60% | -$538K |
|
503
Church & Dwight Co
CHD
$22.7B
| $351K | ﹤0.01% |
4,805
-7,206
| -60% | -$526K |
|
504
Illumina
ILMN
$14.7B
| $350K | ﹤0.01% |
978
+733
| +299% | +$262K |
|
|
HA
505
DELISTED
Hawaiian Holdings, Inc.
HA
| $348K | ﹤0.01% |
+12,711
| New | +$348K |
|
506
Inspire Medical Systems
INSP
$2.33B
| $347K | ﹤0.01% |
5,724
-2,351
| -29% | -$143K |
|
507
IAMGOLD
IAG
$6.27B
| $346K | ﹤0.01% |
102,446
+90,254
| +740% | +$305K |
|
508
Rush Enterprises Class A
RUSHA
$4.42B
| $346K | ﹤0.01% |
21,357
+20,306
| +1,932% | +$329K |
|
|
SRCL
509
DELISTED
Stericycle Inc
SRCL
| $346K | ﹤0.01% |
7,253
-5,364
| -43% | -$256K |
|
510
WPP
WPP
$5.8B
| $345K | ﹤0.01% |
+5,492
| New | +$345K |
|
|
SC
511
DELISTED
SANTANDER CONSUMER USA HOLDINGS INC
SC
| $343K | ﹤0.01% |
+14,337
| New | +$343K |
|
|
SNR
512
DELISTED
NEW SENIOR INVESTMENT GROUP INC.
SNR
| $343K | ﹤0.01% |
51,046
+16,186
| +46% | +$109K |
|
|
BREW
513
DELISTED
Craft Brew Alliance, Inc.
BREW
| $342K | ﹤0.01% |
24,470
+23,070
| +1,648% | +$322K |
|
514
Ericsson
ERIC
$26.5B
| $340K | ﹤0.01% |
+35,812
| New | +$340K |
|
515
iShares MSCI Japan ETF
EWJ
$15.6B
| $340K | ﹤0.01% |
6,235
-95,106
| -94% | -$5.19M |
|
|
WLL
516
DELISTED
Whiting Petroleum Corporation
WLL
| $339K | ﹤0.01% |
+243
| New | +$339K |
|
517
Dolby
DLB
$6.8B
| $338K | ﹤0.01% |
+5,240
| New | +$338K |
|
518
Annaly Capital Management
NLY
$14.2B
| $338K | ﹤0.01% |
9,271
+3,416
| +58% | +$125K |
|
519
Huntington Ingalls Industries
HII
$10.7B
| $334K | ﹤0.01% |
1,488
-149
| -9% | -$33.4K |
|
520
KraneShares Bosera MSCI China A 50 Connect Index ETF
KBA
$232M
| $334K | ﹤0.01% |
10,811
+7,489
| +225% | +$231K |
|
521
GrafTech
EAF
$199M
| $333K | ﹤0.01% |
2,896
+2,058
| +246% | +$237K |
|
522
Nektar Therapeutics
NKTR
$916M
| $333K | ﹤0.01% |
625
-920
| -60% | -$490K |
|
523
Post Holdings
POST
$5.69B
| $331K | ﹤0.01% |
+4,874
| New | +$331K |
|
524
Monolithic Power Systems
MPWR
$41B
| $328K | ﹤0.01% |
+2,418
| New | +$328K |
|
525
Progress Software
PRGS
$1.83B
| $328K | ﹤0.01% |
+7,520
| New | +$328K |
|