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 | |
|---|---|---|---|---|---|---|
1551
Rogers Communications
RCI
$19.3B
| $72K | ﹤0.01% |
+1,564
| New | +$72K |
|
|
WSR
1552
Whitestone REIT
WSR
$649M
| $72K | ﹤0.01% |
7,450
+7,242
| +3,482% | +$70K |
|
|
TECX
1553
Tectonic Therapeutic, Inc. Common Stock
TECX
$282M
| $72K | ﹤0.01% |
476
+425
| +833% | +$64.3K |
|
|
PXD
1554
DELISTED
Pioneer Natural Resource Co.
PXD
| $72K | ﹤0.01% |
456
-20,226
| -98% | -$3.19M |
|
1555
Churchill Downs
CHDN
$6.74B
| $71K | ﹤0.01% |
626
-1,740
| -74% | -$197K |
|
1556
Maravai LifeSciences
MRVI
$407M
| $71K | ﹤0.01% |
+2,003
| New | +$71K |
|
1557
Ooma
OOMA
$360M
| $71K | ﹤0.01% |
4,481
-2,112
| -32% | -$33.5K |
|
1558
Sumitomo Mitsui Financial
SMFG
$106B
| $71K | ﹤0.01% |
9,879
+9,847
| +30,772% | +$70.8K |
|
1559
SPDR S&P Pharmaceuticals ETF
XPH
$169M
| $71K | ﹤0.01% |
1,421
+1,292
| +1,002% | +$64.6K |
|
|
INFN
1560
DELISTED
Infinera Corporation Common Stock
INFN
| $71K | ﹤0.01% |
7,379
-26,894
| -78% | -$259K |
|
|
CFRX
1561
DELISTED
ContraFect Corporation
CFRX
| $71K | ﹤0.01% |
187
+43
| +30% | +$16.3K |
|
1562
Ardelyx
ARDX
$1.49B
| $70K | ﹤0.01% |
10,613
-37,592
| -78% | -$248K |
|
1563
Cato Corp
CATO
$91.5M
| $70K | ﹤0.01% |
5,854
+3,412
| +140% | +$40.8K |
|
1564
First Financial Bancorp
FFBC
$2.42B
| $70K | ﹤0.01% |
2,919
+2,772
| +1,886% | +$66.5K |
|
1565
Global Payments
GPN
$20.7B
| $70K | ﹤0.01% |
350
| – | – |
|
1566
Liberty Global Class A
LBTYA
$4.01B
| $70K | ﹤0.01% |
2,758
-19,339
| -88% | -$491K |
|
1567
Palomar
PLMR
$3.08B
| $70K | ﹤0.01% |
1,054
-1,767
| -63% | -$117K |
|
|
MODN
1568
DELISTED
MODEL N, INC.
MODN
| $70K | ﹤0.01% |
2,013
+563
| +39% | +$19.6K |
|
|
ARI
1569
Apollo Commercial Real Estate
ARI
$1.46B
| $69K | ﹤0.01% |
4,978
+227
| +5% | +$3.15K |
|
1570
Central Pacific Financial
CPF
$823M
| $69K | ﹤0.01% |
+2,599
| New | +$69K |
|
1571
Comstock Resources
CRK
$5.03B
| $69K | ﹤0.01% |
12,496
-50,180
| -80% | -$277K |
|
1572
Pennant Group
PNTG
$842M
| $69K | ﹤0.01% |
+1,527
| New | +$69K |
|
1573
Regis Corp
RGS
$69.4M
| $69K | ﹤0.01% |
275
-824
| -75% | -$207K |
|
1574
VICI Properties
VICI
$34.8B
| $69K | ﹤0.01% |
2,460
-727
| -23% | -$20.4K |
|
|
SREV
1575
DELISTED
ServiceSource International, Inc.
SREV
| $69K | ﹤0.01% |
47,105
+40,901
| +659% | +$59.9K |
|