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 | |
|---|---|---|---|---|---|---|
851
Castle Biosciences
CSTL
$660M
| $233K | ﹤0.01% |
8,968
+8,022
| +848% | +$208K |
|
|
SRNE
852
DELISTED
Sorrento Therapeutics, Inc.
SRNE
| $231K | ﹤0.01% |
147,289
-100,268
| -41% | -$157K |
|
853
Equinox Gold
EQX
$8.58B
| $230K | ﹤0.01% |
63,015
-4,018
| -6% | -$14.7K |
|
854
West Pharmaceutical
WST
$19B
| $230K | ﹤0.01% |
936
-2,314
| -71% | -$569K |
|
855
IPG Photonics
IPGP
$3.49B
| $229K | ﹤0.01% |
+2,724
| New | +$229K |
|
856
Pentair
PNR
$18.5B
| $229K | ﹤0.01% |
+5,658
| New | +$229K |
|
857
The SPAC and New Issue ETF
SPCX
$9.21M
| $229K | ﹤0.01% |
+8,749
| New | +$229K |
|
|
API
858
Agora
API
$351M
| $228K | ﹤0.01% |
62,952
+44,271
| +237% | +$160K |
|
859
Amplify Alternative Harvest ETF
MJ
$171M
| $227K | ﹤0.01% |
4,129
-5,826
| -59% | -$320K |
|
860
Viridian Therapeutics
VRDN
$1.6B
| $227K | ﹤0.01% |
11,070
+9,831
| +793% | +$202K |
|
|
NOAH
861
Noah Holdings
NOAH
$793M
| $226K | ﹤0.01% |
+17,116
| New | +$226K |
|
862
ProShares UltraShort S&P500
SDS
$468M
| $226K | ﹤0.01% |
4,143
-4,427
| -52% | -$241K |
|
863
Altisource Portfolio Solutions
ASPS
$124M
| $225K | ﹤0.01% |
2,151
+787
| +58% | +$82.3K |
|
864
Microchip Technology
MCHP
$35.1B
| $225K | ﹤0.01% |
+3,692
| New | +$225K |
|
865
Emergent Biosolutions
EBS
$439M
| $224K | ﹤0.01% |
10,715
+7,522
| +236% | +$157K |
|
866
iShares S&P 100 ETF
OEF
$22.5B
| $224K | ﹤0.01% |
1,382
+312
| +29% | +$50.6K |
|
867
Interactive Brokers
IBKR
$28.2B
| $223K | ﹤0.01% |
13,960
-25,184
| -64% | -$402K |
|
868
Retractable Technologies
RVP
$24.3M
| $221K | ﹤0.01% |
111,980
+17,232
| +18% | +$34K |
|
869
Vanguard Value ETF
VTV
$146B
| $221K | ﹤0.01% |
+1,797
| New | +$221K |
|
|
MRNS
870
DELISTED
Marinus Pharmaceuticals, Inc
MRNS
| $221K | ﹤0.01% |
33,342
+32,368
| +3,323% | +$215K |
|
|
GBT
871
DELISTED
Global Blood Therapeutics, Inc.
GBT
| $221K | ﹤0.01% |
+3,250
| New | +$221K |
|
872
Adicet Bio
ACET
$73.4M
| $219K | ﹤0.01% |
+15,454
| New | +$219K |
|
873
Ituran Location and Control
ITRN
$699M
| $218K | ﹤0.01% |
9,380
+5,578
| +147% | +$130K |
|
874
Revvity
RVTY
$9.95B
| $218K | ﹤0.01% |
+1,812
| New | +$218K |
|
875
iShares Core MSCI Emerging Markets ETF
IEMG
$106B
| $216K | ﹤0.01% |
5,037
+3,641
| +261% | +$156K |
|