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
| Rank | Stock | Value |
|---|---|---|
| 1 |
Alibaba
BABA
|
+$120M |
| 2 |
Alphabet (Google) Class A
GOOGL
|
+$93.9M |
| 3 |
Walt Disney
DIS
|
+$71.7M |
| 4 |
KraneShares CSI China Internet ETF
KWEB
|
+$41.7M |
| 5 |
Citigroup
C
|
+$39.4M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$136M |
| 2 |
Amazon
AMZN
|
+$118M |
| 3 |
SPDR Gold Trust
GLD
|
+$56.2M |
| 4 |
Microsoft
MSFT
|
+$52.4M |
| 5 |
State Street SPDR Dow Jones Industrial Average ETF Trust
DIA
|
+$45.6M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.33% |
| 2 | Consumer Discretionary | 0.3% |
| 3 | Communication Services | 0.21% |
| 4 | Financials | 0.19% |
| 5 | Healthcare | 0.19% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
4101
Fresenius Medical Care
FMS
$13.3B
| $336K | ﹤0.01% |
16,139
+353
| +2% | +$6.78K |
|
4102
CALL
Clearwater Paper
CLW
$282M
| $335K | ﹤0.01% |
9,300
+7,400
| +389% | +$266K |
|
4103
PUT
International Money Express
IMXI
$398M
| $335K | ﹤0.01% |
15,200
+15,000
| +7,500% | +$288K |
|
|
ACB
4104
CALL
Aurora Cannabis
ACB
$168M
| $334K | ﹤0.01% |
70,340
-11,850
| -14% | -$57.1K |
|
4105
CALL
Cue Biopharma
CUE
$127M
| $334K | ﹤0.01% |
4,227
+2,570
| +155% | +$184K |
|
|
DHC
4106
CALL
Diversified Healthcare Trust
DHC
$2.28B
| $333K | ﹤0.01% |
89,100
-10,000
| -10% | -$23.5K |
|
4107
PUT
NETGEAR
NTGR
$663M
| $333K | ﹤0.01% |
22,900
+20,500
| +854% | +$265K |
|
|
ARCH
4108
DELISTED
Arch Resources, Inc.
ARCH
| $332K | ﹤0.01% |
2,004
-2,890
| -59% | -$454K |
|
4109
CALL
Imperial Oil
IMO
$60.8B
| $331K | ﹤0.01% |
5,800
+2,300
| +66% | +$132K |
|
4110
Planet Fitness
PLNT
$4.43B
| $331K | ﹤0.01% |
+4,542
| New | +$279K |
|
4111
PUT
Designer Brands
DBI
$322M
| $330K | ﹤0.01% |
37,300
+11,600
| +45% | +$122K |
|
4112
CALL
Enovis
ENOV
$1.7B
| $330K | ﹤0.01% |
5,900
+4,500
| +321% | +$224K |
|
4113
CALL
Principal Financial Group
PFG
$24.5B
| $330K | ﹤0.01% |
4,200
-15,600
| -79% | -$1.13M |
|
|
PDCO
4114
CALL
DELISTED
Patterson Companies, Inc.
PDCO
| $330K | ﹤0.01% |
11,600
+6,600
| +132% | +$194K |
|
4115
PUT
Broadridge
BR
$18.3B
| $329K | ﹤0.01% |
1,600
-10,100
| -86% | -$1.86M |
|
|
RWT
4116
PUT
Redwood Trust
RWT
$587M
| $329K | ﹤0.01% |
44,500
+21,400
| +93% | +$150K |
|
4117
StoneX
SNEX
$8.99B
| $329K | ﹤0.01% |
+15,069
| New | +$286K |
|
4118
Wendy's
WEN
$1.46B
| $329K | ﹤0.01% |
16,917
+13,395
| +380% | +$258K |
|
4119
State Street Health Care Select Sector SPDR ETF
XLV
$43.2B
| $329K | ﹤0.01% |
+2,415
| New | +$314K |
|
|
DENN
4120
CALL
DELISTED
Denny's
DENN
| $328K | ﹤0.01% |
30,200
+29,200
| +2,920% | +$275K |
|
4121
PUT
TC Energy
TRP
$70.5B
| $328K | ﹤0.01% |
8,400
-19,600
| -70% | -$714K |
|
4122
PUT
Veeco
VECO
$2.79B
| $328K | ﹤0.01% |
10,600
+10,500
| +10,500% | +$293K |
|
|
GOEV
4123
CALL
DELISTED
Canoo Inc. Class A Common Stock
GOEV
| $328K | ﹤0.01% |
2,781
+160
| +6% | +$21.7K |
|
4124
IDT Corp
IDT
$1.69B
| $327K | ﹤0.01% |
9,614
+9,387
| +4,135% | +$277K |
|
|
PPSI
4125
PUT
Pioneer Power Solutions
PPSI
$32.2M
| $327K | ﹤0.01% |
48,300
-115,800
| -71% | -$686K |
|
Similar funds
Simplex Trading's Q4 2023 Portfolio in Review
As of Q4 2023, Simplex Trading held 10,333 positions worth $156B, up 23% from $127B the previous quarter. Its ten largest holdings account for 42% of the portfolio.
Simplex Trading deployed $15.1B of net new capital in Q4 2023, opening 1,639 new positions and adding to 3,920 existing holdings. Its largest new stake was Walt Disney: 812,984 shares worth $73.4M.
By sector, the portfolio is most concentrated in Technology at 0.33% of assets, down from 0.44% a quarter earlier, followed by Consumer Discretionary and Communication Services.
On the sell side, the largest reduction was iShares 20+ Year Treasury Bond ETF, an estimated $136M trimmed.
- Simplex Trading's largest Q4 2023 buy was Walt Disney: 812,984 shares worth $73.4M.
- Simplex Trading added most to Alibaba in Q4 2023, an estimated $120M increase.
- Simplex Trading's biggest Q4 2023 reduction was iShares 20+ Year Treasury Bond ETF, cutting an estimated $136M.
- Simplex Trading fully exited Amazon in Q4 2023, selling an estimated $118M.
- Simplex Trading's ten largest holdings make up 42% of its $156B portfolio in Q4 2023.
- Simplex Trading opened 1,639 new positions and closed 1,508 in Q4 2023.
- Simplex Trading's portfolio value rose 23% quarter-over-quarter to $156B.
Based on Simplex Trading's 13F filing for Q4 2023, filed 2 Feb 2024.