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 | |
|---|---|---|---|---|---|---|
|
LAND
4926
CALL
Gladstone Land Corp
LAND
$357M
| $156K | ﹤0.01% |
10,800
+6,600
| +157% | +$94K |
|
4927
PUT
National Grid
NGG
$80.8B
| $156K | ﹤0.01% |
2,441
-15,493
| -86% | -$925K |
|
4928
PUT
Sportradar
SRAD
$4.35B
| $156K | ﹤0.01% |
14,200
+11,600
| +446% | +$114K |
|
|
CVM.WS
4929
PUT
DELISTED
Cel-Sci Corp Series S
CVM.WS
| $156K | ﹤0.01% |
57,500
+27,900
| +94% | +$75.7K |
|
|
SLAI
4930
CALL
DELISTED
SOLAI Ltd ADS
SLAI
| $155K | ﹤0.01% |
5,086
-5,928
| -54% | -$146K |
|
4931
PUT
DXC Technology
DXC
$1.82B
| $155K | ﹤0.01% |
6,800
-2,400
| -26% | -$53.4K |
|
4932
CALL
VanEck Energy Income ETF
EINC
$77.9M
| $155K | ﹤0.01% |
11,600
+5,500
| +90% | +$366K |
|
4933
Warrior Met Coal
HCC
$4.25B
| $155K | ﹤0.01% |
+2,550
| New | +$135K |
|
4934
Direxion Daily S&P Biotech Bull 3X ETF
LABU
$553M
| $155K | ﹤0.01% |
1,275
-11,189
| -90% | -$856K |
|
4935
Microvast
MVST
$267M
| $155K | ﹤0.01% |
111,116
+26,476
| +31% | +$35.5K |
|
|
UMH
4936
UMH Properties
UMH
$1.3B
| $155K | ﹤0.01% |
+10,162
| New | +$146K |
|
|
SRC
4937
DELISTED
SPIRIT REALTY CAPITAL, INC.
SRC
| $155K | ﹤0.01% |
3,570
+3,446
| +2,779% | +$133K |
|
|
LTHM
4938
PUT
DELISTED
Livent Corporation
LTHM
| $155K | ﹤0.01% |
136,300
+115,300
| +549% | +$1.8M |
|
|
AIV
4939
PUT
Aimco
AIV
$383M
| $154K | ﹤0.01% |
19,700
+8,400
| +74% | +$56.7K |
|
4940
CALL
Epsilon Energy
EPSN
$166M
| $154K | ﹤0.01% |
30,500
+18,200
| +148% | +$97.2K |
|
4941
PUT
IAMGOLD
IAG
$8.42B
| $154K | ﹤0.01% |
60,900
+15,600
| +34% | +$37.4K |
|
4942
PUT
MiMedx Group
MDXG
$636M
| $154K | ﹤0.01% |
17,600
+1,200
| +7% | +$8.79K |
|
|
MTLS
4943
PUT
Materialise
MTLS
$371M
| $154K | ﹤0.01% |
+23,500
| New | +$139K |
|
4944
CALL
Olema Pharmaceuticals
OLMA
$1.03B
| $154K | ﹤0.01% |
11,000
+5,500
| +100% | +$73.9K |
|
4945
PUT
Pagaya Technologies
PGY
$1.47B
| $154K | ﹤0.01% |
9,300
-16,383
| -64% | -$267K |
|
|
SOL
4946
DELISTED
Emeren Group
SOL
| $154K | ﹤0.01% |
56,458
+11,247
| +25% | +$29.7K |
|
4947
Xperi
XPER
$364M
| $154K | ﹤0.01% |
+14,005
| New | +$135K |
|
4948
Endava
DAVA
$153M
| $153K | ﹤0.01% |
1,973
-2,155
| -52% | -$133K |
|
4949
PUT
Empire State Realty Trust
ESRT
$862M
| $153K | ﹤0.01% |
15,800
+9,000
| +132% | +$78K |
|
4950
Steven Madden
SHOO
$3.5B
| $153K | ﹤0.01% |
+3,664
| New | +$133K |
|
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.