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 | |
|---|---|---|---|---|---|---|
4051
News Corp Class A
NWSA
$15.3B
| $355K | ﹤0.01% |
+14,500
| New | +$315K |
|
4052
CALL
Gibraltar Industries
ROCK
$1.39B
| $355K | ﹤0.01% |
4,500
+1,300
| +41% | +$88.8K |
|
|
HOLI
4053
DELISTED
Hollsys Automation Technologies INTERNATIONAL, LTD. COMMON (British Virgin Island)
HOLI
| $355K | ﹤0.01% |
13,496
+5,141
| +62% | +$115K |
|
|
CPRX
4054
DELISTED
Catalyst Pharmaceutical
CPRX
| $354K | ﹤0.01% |
21,074
+20,207
| +2,331% | +$276K |
|
|
EFC
4055
CALL
Ellington Financial
EFC
$1.7B
| $354K | ﹤0.01% |
27,900
+14,700
| +111% | +$186K |
|
4056
CALL
Leslie's
LESL
$9.83M
| $354K | ﹤0.01% |
2,565
+1,425
| +125% | +$157K |
|
4057
Rollins
ROL
$18.8B
| $354K | ﹤0.01% |
+8,118
| New | +$316K |
|
4058
CALL
Sonic Automotive
SAH
$3.31B
| $354K | ﹤0.01% |
6,300
+5,000
| +385% | +$250K |
|
4059
PUT
Flex
FLEX
$41.5B
| $353K | ﹤0.01% |
15,393
-15,526
| -50% | -$311K |
|
4060
CALL
Quantum-Si Incorporated
QSI
$166M
| $353K | ﹤0.01% |
176,000
-14,800
| -8% | -$22.6K |
|
4061
PUT
Invesco CurrencyShares Australian Dollar Trust
FXA
$96.7M
| $351K | ﹤0.01% |
5,200
+4,900
| +1,633% | +$316K |
|
4062
CALL
IDT Corp
IDT
$1.69B
| $351K | ﹤0.01% |
10,300
+2,200
| +27% | +$64.8K |
|
4063
Oaktree Specialty Lending
OCSL
$1.06B
| $351K | ﹤0.01% |
+17,223
| New | +$340K |
|
4064
Vanguard FTSE Emerging Markets ETF
VWO
$119B
| $351K | ﹤0.01% |
8,559
+3,964
| +86% | +$157K |
|
4065
CALL
Eastman Chemical
EMN
$7.79B
| $350K | ﹤0.01% |
3,900
-13,500
| -78% | -$1.08M |
|
|
BLUE
4066
DELISTED
bluebird bio
BLUE
| $349K | ﹤0.01% |
12,663
+128
| +1% | +$7.8K |
|
4067
CALL
Cerence
CRNC
$368M
| $349K | ﹤0.01% |
17,800
-1,000
| -5% | -$17.4K |
|
|
HBI
4068
DELISTED
Hanesbrands
HBI
| $349K | ﹤0.01% |
78,290
-140,809
| -64% | -$573K |
|
4069
PUT
Pitney Bowes
PBI
$2.41B
| $349K | ﹤0.01% |
79,400
+58,600
| +282% | +$227K |
|
4070
Black Stone Minerals
BSM
$3.14B
| $348K | ﹤0.01% |
+21,867
| New | +$376K |
|
4071
CALL
Pulse Biosciences
PLSE
$2.45B
| $348K | ﹤0.01% |
28,500
-5,800
| -17% | -$40.2K |
|
|
VISN
4072
CALL
Vistance Networks Inc
VISN
$2.67B
| $347K | ﹤0.01% |
123,300
+1,500
| +1% | +$3.25K |
|
4073
El Pollo Loco
LOCO
$497M
| $347K | ﹤0.01% |
39,401
+35,951
| +1,042% | +$309K |
|
4074
CALL
Century Communities
CCS
$2.03B
| $346K | ﹤0.01% |
3,800
+1,800
| +90% | +$129K |
|
4075
CALL
Diodes
DIOD
$3.69B
| $346K | ﹤0.01% |
+4,300
| New | +$314K |
|
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.