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 |
Invesco QQQ Trust
QQQ
|
$85.4M |
| 2 |
SPDR Gold Trust
GLD
|
$75.9M |
| 3 |
NVIDIA
NVDA
|
$42.6M |
| 4 |
Netflix
NFLX
|
$41.1M |
| 5 |
iShares MSCI EAFE ETF
EFA
|
$40.5M |
Top Sells
| 1 |
Apple
AAPL
|
$65.7M |
| 2 |
iPath Series B S&P 500 VIX Short-Term Futures ETN
VXX
|
$25.5M |
| 3 |
SPDR S&P 500 ETF Trust
SPY
|
$24.4M |
| 4 |
SPDR Dow Jones Industrial Average ETF Trust
DIA
|
$24.3M |
| 5 |
Broadcom
AVGO
|
$21.3M |
Sector Composition
| 1 | Technology | 15.2% |
| 2 | Consumer Discretionary | 14.52% |
| 3 | Communication Services | 10.57% |
| 4 | Healthcare | 8.15% |
| 5 | Financials | 7.15% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Shares Change % | Capital Flow | |
|---|---|---|---|---|---|---|
551
Sturm, Ruger & Co
RGR
$576M
| $371K | ﹤0.01% |
4,887
+4,721
| +2,844% | +$358K |
|
552
United Therapeutics
UTHR
$17.8B
| $370K | ﹤0.01% |
+3,064
| New | +$370K |
|
553
Global X Uranium ETF
URA
$4.25B
| $368K | ﹤0.01% |
33,978
+29,065
| +592% | +$315K |
|
|
ACIA
554
DELISTED
Acacia Communications, Inc. Common Stock
ACIA
| $367K | ﹤0.01% |
+5,477
| New | +$367K |
|
555
Banco Santander
SAN
$145B
| $365K | ﹤0.01% |
158,411
+148,909
| +1,567% | +$343K |
|
|
RST
556
DELISTED
ROSETTA STONE INC
RST
| $365K | ﹤0.01% |
21,695
+7,349
| +51% | +$124K |
|
557
Arch Capital
ACGL
$33.9B
| $364K | ﹤0.01% |
12,737
+9,129
| +253% | +$261K |
|
558
Invesco DB Commodity Index Tracking Fund
DBC
$1.27B
| $363K | ﹤0.01% |
29,500
+12,151
| +70% | +$150K |
|
559
Guidewire Software
GWRE
$22B
| $362K | ﹤0.01% |
+3,273
| New | +$362K |
|
|
RAD
560
DELISTED
Rite Aid Corporation
RAD
| $360K | ﹤0.01% |
21,109
+20,774
| +6,201% | +$354K |
|
561
Teucrium Corn Fund
CORN
$49M
| $358K | ﹤0.01% |
22,667
+18,432
| +435% | +$291K |
|
562
Fidelity National Information Services
FIS
$36B
| $356K | ﹤0.01% |
2,662
-11,047
| -81% | -$1.48M |
|
563
Domo
DOMO
$621M
| $352K | ﹤0.01% |
10,945
+5,360
| +96% | +$172K |
|
564
Northern Trust
NTRS
$24.3B
| $352K | ﹤0.01% |
4,447
-33,357
| -88% | -$2.64M |
|
565
GameStop
GME
$10.4B
| $351K | ﹤0.01% |
323,616
+305,072
| +1,645% | +$331K |
|
566
El Pollo Loco
LOCO
$315M
| $351K | ﹤0.01% |
23,795
+21,224
| +826% | +$313K |
|
567
Repligen
RGEN
$6.79B
| $351K | ﹤0.01% |
+2,842
| New | +$351K |
|
568
Dropbox
DBX
$8.19B
| $350K | ﹤0.01% |
16,088
-147,254
| -90% | -$3.2M |
|
569
O-I Glass
OI
$2B
| $349K | ﹤0.01% |
38,895
+26,362
| +210% | +$237K |
|
570
Green Plains
GPRE
$662M
| $347K | ﹤0.01% |
34,016
+9,663
| +40% | +$98.6K |
|
571
Jacobs Solutions
J
$17.3B
| $345K | ﹤0.01% |
+4,927
| New | +$345K |
|
572
Essent Group
ESNT
$6.29B
| $344K | ﹤0.01% |
9,488
-3,144
| -25% | -$114K |
|
573
LivePerson
LPSN
$93.7M
| $344K | ﹤0.01% |
8,308
-32,217
| -79% | -$1.33M |
|
574
Xcel Energy
XEL
$42.4B
| $344K | ﹤0.01% |
5,508
-83
| -1% | -$5.18K |
|
575
Cars.com
CARS
$830M
| $343K | ﹤0.01% |
+59,621
| New | +$343K |
|