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 |
Microsoft
MSFT
|
+$101M |
| 2 |
NVIDIA
NVDA
|
+$66M |
| 3 |
Citigroup
C
|
+$51.8M |
| 4 |
Berkshire Hathaway Class B
BRK.B
|
+$42.7M |
| 5 |
SPDR Gold Trust
GLD
|
+$39.4M |
Top Sells
| 1 |
Apple
AAPL
|
+$411M |
| 2 |
Vanguard S&P 500 ETF
VOO
|
+$64M |
| 3 |
Meta Platforms (Facebook)
META
|
+$39.8M |
| 4 |
iShares Core S&P 500 ETF
IVV
|
+$34.3M |
| 5 |
PayPal
PYPL
|
+$32.9M |
Sector Composition
| 1 | Technology | 17.4% |
| 2 | Financials | 12.04% |
| 3 | Consumer Discretionary | 10.17% |
| 4 | Healthcare | 8.63% |
| 5 | Industrials | 6.03% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Shares Change % | Capital Flow | |
|---|---|---|---|---|---|---|
651
Zillow
ZG
$20B
| $402K | ﹤0.01% |
14,066
-10,643
| -43% | -$304K |
|
|
GLOP
652
DELISTED
GASLOG PARTNERS LP
GLOP
| $401K | ﹤0.01% |
+77,904
| New | +$401K |
|
653
G-III Apparel Group
GIII
$1.13B
| $400K | ﹤0.01% |
26,775
+21,759
| +434% | +$325K |
|
654
Synaptics
SYNA
$2.67B
| $399K | ﹤0.01% |
4,035
+2,761
| +217% | +$273K |
|
655
Adtran
ADTN
$828M
| $398K | ﹤0.01% |
+20,339
| New | +$398K |
|
656
Equity Residential
EQR
$25.2B
| $397K | ﹤0.01% |
+5,907
| New | +$397K |
|
|
SAVE
657
DELISTED
Spirit Airlines, Inc.
SAVE
| $397K | ﹤0.01% |
21,110
-17,488
| -45% | -$329K |
|
|
SAFE
658
DELISTED
Safehold Inc.
SAFE
| $394K | ﹤0.01% |
14,893
+6,931
| +87% | +$183K |
|
659
Maravai LifeSciences
MRVI
$376M
| $393K | ﹤0.01% |
15,398
+10,848
| +238% | +$277K |
|
660
Greenidge Generation Holdings
GREE
$21.6M
| $392K | ﹤0.01% |
19,614
+1,749
| +10% | +$35K |
|
661
Outdoor Holding Company Common Stock
POWW
$177M
| $392K | ﹤0.01% |
134,038
-16,846
| -11% | -$49.3K |
|
662
Origin Materials
ORGN
$80.2M
| $390K | ﹤0.01% |
75,774
+40,295
| +114% | +$207K |
|
663
Hims & Hers Health
HIMS
$10.8B
| $388K | ﹤0.01% |
69,710
+2,307
| +3% | +$12.8K |
|
664
Lantheus
LNTH
$3.57B
| $388K | ﹤0.01% |
5,524
-2,491
| -31% | -$175K |
|
665
ScottsMiracle-Gro
SMG
$3.5B
| $387K | ﹤0.01% |
9,060
+7,245
| +399% | +$309K |
|
666
ProShares Short VIX Short-Term Futures ETF
SVXY
$251M
| $387K | ﹤0.01% |
+15,964
| New | +$387K |
|
667
Teradata
TDC
$1.99B
| $387K | ﹤0.01% |
+12,486
| New | +$387K |
|
|
DSKE
668
DELISTED
Daseke, Inc. Common Stock
DSKE
| $387K | ﹤0.01% |
71,536
+57,712
| +417% | +$312K |
|
669
Arch Capital
ACGL
$33.8B
| $383K | ﹤0.01% |
8,421
+8,397
| +34,988% | +$382K |
|
670
VanEck Steel ETF
SLX
$81.8M
| $378K | ﹤0.01% |
+7,924
| New | +$378K |
|
671
iShares MSCI Chile ETF
ECH
$705M
| $377K | ﹤0.01% |
15,726
+7,694
| +96% | +$184K |
|
672
SLM Corp
SLM
$6.01B
| $377K | ﹤0.01% |
27,013
+9,670
| +56% | +$135K |
|
673
Globus Medical
GMED
$7.89B
| $375K | ﹤0.01% |
+6,308
| New | +$375K |
|
674
Direxion Daily S&P Oil & Gas Exp & Prod Bear 2X Shares
DRIP
$50M
| $374K | ﹤0.01% |
19,666
-65,391
| -77% | -$1.24M |
|
675
Dorian LPG
LPG
$1.35B
| $374K | ﹤0.01% |
27,634
+14,132
| +105% | +$191K |
|