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 | |
|---|---|---|---|---|---|---|
3026
AerSale
ASLE
$292M
| $969K | ﹤0.01% |
76,361
+18,100
| +31% | +$263K |
|
3027
PUT
Mirion Technologies
MIR
$4.05B
| $969K | ﹤0.01% |
94,600
+14,500
| +18% | +$122K |
|
3028
CALL
Clearfield
CLFD
$421M
| $965K | ﹤0.01% |
33,200
+7,300
| +28% | +$195K |
|
3029
CALL
Theravance Biopharma
TBPH
$874M
| $965K | ﹤0.01% |
85,900
+43,400
| +102% | +$437K |
|
3030
CALL
CubeSmart
CUBE
$9.53B
| $964K | ﹤0.01% |
20,800
+19,700
| +1,791% | +$774K |
|
3031
CALL
Celanese
CE
$5.09B
| $963K | ﹤0.01% |
6,200
-12,000
| -66% | -$1.57M |
|
3032
PUT
Aaon
AAON
$8.41B
| $962K | ﹤0.01% |
21,000
+13,000
| +163% | +$802K |
|
3033
CALL
Pinnacle West Capital
PNW
$12.9B
| $962K | ﹤0.01% |
13,400
-4,800
| -26% | -$353K |
|
|
XELA
3034
CALL
DELISTED
Exela Technologies, Inc. Common Stock
XELA
| $962K | ﹤0.01% |
339,900
| – | – |
|
3035
PUT
Huntington Ingalls Industries
HII
$11.3B
| $960K | ﹤0.01% |
3,700
-900
| -20% | -$210K |
|
3036
CALL
NextDecade
NEXT
$1.85B
| $959K | ﹤0.01% |
201,200
+89,700
| +80% | +$418K |
|
3037
NextEra Energy
NEE
$187B
| $958K | ﹤0.01% |
+15,782
| New | +$899K |
|
|
HEES
3038
CALL
DELISTED
H&E Equipment Services
HEES
| $957K | ﹤0.01% |
18,300
+18,000
| +6,000% | +$813K |
|
|
VNET
3039
PUT
VNET Group
VNET
$2.05B
| $956K | ﹤0.01% |
333,200
+268,900
| +418% | +$809K |
|
3040
Huntington Bancshares
HBAN
$35.1B
| $955K | ﹤0.01% |
75,152
-32,432
| -30% | -$355K |
|
3041
Mattel
MAT
$4.17B
| $955K | ﹤0.01% |
50,614
+26,357
| +109% | +$513K |
|
3042
CALL
Comstock Resources
CRK
$3.97B
| $954K | ﹤0.01% |
107,800
-48,300
| -31% | -$522K |
|
|
SCS
3043
CALL
DELISTED
Steelcase
SCS
| $954K | ﹤0.01% |
70,600
+12,700
| +22% | +$151K |
|
3044
CALL
AppFolio
APPF
$5.85B
| $952K | ﹤0.01% |
5,500
-11,200
| -67% | -$2.1M |
|
3045
PUT
Levi Strauss
LEVI
$9.44B
| $952K | ﹤0.01% |
57,600
+22,800
| +66% | +$338K |
|
3046
PUT
NovoCure
NVCR
$2.04B
| $951K | ﹤0.01% |
63,700
-10,600
| -14% | -$142K |
|
3047
PUT
Amplify Junior Silver Miners ETF
SILJ
$3.27B
| $951K | ﹤0.01% |
88,500
+4,400
| +5% | +$39.7K |
|
|
CIVI
3048
CALL
DELISTED
Civitas Resources
CIVI
| $950K | ﹤0.01% |
13,900
+900
| +7% | +$64.4K |
|
3049
iQIYI
IQ
$1.18B
| $950K | ﹤0.01% |
+194,693
| New | +$920K |
|
3050
PUT
The Greenbrier Companies
GBX
$1.61B
| $949K | ﹤0.01% |
21,500
+9,200
| +75% | +$360K |
|
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.