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 |
SPDR Dow Jones Industrial Average ETF Trust
DIA
|
+$32.1M |
| 2 |
PARA
Paramount Global Class B
PARA
|
+$23.3M |
| 3 |
Pinduoduo
PDD
|
+$17.3M |
| 4 |
Pfizer
PFE
|
+$16.8M |
| 5 |
American Airlines Group
AAL
|
+$14.5M |
Top Sells
| 1 |
Amazon
AMZN
|
+$64.4M |
| 2 |
Alphabet (Google) Class C
GOOG
|
+$38.1M |
| 3 |
AutoZone
AZO
|
+$32.2M |
| 4 |
SPDR S&P 500 ETF Trust
SPY
|
+$25.3M |
| 5 |
Apple
AAPL
|
+$22.5M |
Sector Composition
| 1 | Technology | 20.25% |
| 2 | Consumer Discretionary | 15.22% |
| 3 | Healthcare | 10.03% |
| 4 | Financials | 9.2% |
| 5 | Industrials | 9.11% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Shares Change % | Capital Flow | |
|---|---|---|---|---|---|---|
1651
Axcelis
ACLS
$2.86B
| $56K | ﹤0.01% |
1,373
-1,666
| -55% | -$68K |
|
1652
Church & Dwight Co
CHD
$22.5B
| $56K | ﹤0.01% |
642
-2,879
| -82% | -$251K |
|
1653
Open Text
OTEX
$9.3B
| $56K | ﹤0.01% |
+1,190
| New | +$56K |
|
1654
SLR Investment Corp
SLRC
$875M
| $56K | ﹤0.01% |
3,207
+2,439
| +318% | +$42.6K |
|
|
ONIT
1655
Onity Group Inc.
ONIT
$359M
| $56K | ﹤0.01% |
1,980
-1,198
| -38% | -$33.9K |
|
|
CSCI
1656
DELISTED
COSCIENS Biopharma Inc. Common Stock
CSCI
| $56K | ﹤0.01% |
498
+497
| +49,700% | +$55.9K |
|
|
PGTI
1657
DELISTED
PGT, Inc.
PGTI
| $56K | ﹤0.01% |
2,241
+1,886
| +531% | +$47.1K |
|
|
NMRD
1658
DELISTED
Nemaura Medical, Inc. Common Stock
NMRD
| $56K | ﹤0.01% |
+7,408
| New | +$56K |
|
|
AAIC
1659
DELISTED
Arlington Asset Investment Corp.
AAIC
| $56K | ﹤0.01% |
+13,884
| New | +$56K |
|
1660
Brown & Brown
BRO
$30.5B
| $55K | ﹤0.01% |
1,224
+932
| +319% | +$41.9K |
|
1661
Foster
FSTR
$301M
| $55K | ﹤0.01% |
+3,111
| New | +$55K |
|
1662
iRhythm Technologies
IRTC
$5.56B
| $55K | ﹤0.01% |
+402
| New | +$55K |
|
1663
Kayne Anderson Energy Infrastructure Fund
KYN
$2.08B
| $55K | ﹤0.01% |
7,702
+343
| +5% | +$2.45K |
|
1664
Paycom
PAYC
$12B
| $55K | ﹤0.01% |
149
-634
| -81% | -$234K |
|
|
PHX
1665
DELISTED
PHX Minerals
PHX
| $55K | ﹤0.01% |
19,512
-1,216
| -6% | -$3.43K |
|
1666
Interface
TILE
$1.73B
| $55K | ﹤0.01% |
4,459
-12,885
| -74% | -$159K |
|
1667
UNIFI
UFI
$85M
| $55K | ﹤0.01% |
+2,009
| New | +$55K |
|
|
UMH
1668
UMH Properties
UMH
$1.3B
| $55K | ﹤0.01% |
2,880
+2,537
| +740% | +$48.5K |
|
|
CNCE
1669
DELISTED
Concert Pharmaceuticals, Inc.
CNCE
| $55K | ﹤0.01% |
+11,112
| New | +$55K |
|
|
ZVO
1670
DELISTED
Zovio Inc. Common Stock
ZVO
| $55K | ﹤0.01% |
+13,694
| New | +$55K |
|
|
FNHC
1671
DELISTED
FedNat Holding Company Common Stock
FNHC
| $55K | ﹤0.01% |
11,952
+3,760
| +46% | +$17.3K |
|
1672
Compañía de Minas Buenaventura
BVN
$5.09B
| $54K | ﹤0.01% |
5,455
-2,356
| -30% | -$23.3K |
|
1673
Compass Minerals
CMP
$760M
| $54K | ﹤0.01% |
871
+40
| +5% | +$2.48K |
|
1674
Diana Shipping
DSX
$223M
| $54K | ﹤0.01% |
25,999
+14,511
| +126% | +$30.1K |
|
1675
Simulations Plus
SLP
$316M
| $54K | ﹤0.01% |
865
-1,081
| -56% | -$67.5K |
|