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 | |
|---|---|---|---|---|---|---|
6126
Ituran Location and Control
ITRN
$1.08B
| $47K | ﹤0.01% |
+1,726
| New | +$45.6K |
|
6127
CALL
La-Z-Boy
LZB
$1.64B
| $47K | ﹤0.01% |
1,300
+1,000
| +333% | +$32.2K |
|
6128
CALL
NN Inc
NNBR
$237M
| $47K | ﹤0.01% |
+11,900
| New | +$28.3K |
|
6129
PUT
Prosperity Bancshares
PB
$8.9B
| $47K | ﹤0.01% |
700
-13,700
| -95% | -$801K |
|
6130
PUT
Seadrill
SDRL
$2.59B
| $47K | ﹤0.01% |
1,000
+700
| +233% | +$29.7K |
|
6131
CALL
Senseonics Holdings Inc
SENS
$254M
| $47K | ﹤0.01% |
4,200
+510
| +14% | +$5.83K |
|
6132
PUT
Simply Good Foods
SMPL
$907M
| $47K | ﹤0.01% |
1,200
+900
| +300% | +$33.6K |
|
6133
SmartRent
SMRT
$192M
| $47K | ﹤0.01% |
+14,838
| New | +$43.3K |
|
6134
Spok Holdings
SPOK
$229M
| $47K | ﹤0.01% |
+3,089
| New | +$47.5K |
|
6135
Tradr 2X Long Innovation ETF
TARK
$11.9M
| $47K | ﹤0.01% |
1,022
+958
| +1,497% | +$31.5K |
|
6136
PUT
Vroom Inc
VRM
$36.4M
| $47K | ﹤0.01% |
995
-576
| -37% | -$37.6K |
|
|
YALA
6137
CALL
Yalla Group
YALA
$814M
| $47K | ﹤0.01% |
7,800
-6,400
| -45% | -$36.3K |
|
|
GRTS
6138
DELISTED
Gritstone bio, Inc. Common Stock
GRTS
| $47K | ﹤0.01% |
+23,172
| New | +$42.3K |
|
|
TELL
6139
DELISTED
Tellurian Inc.
TELL
| $47K | ﹤0.01% |
62,872
-92,677
| -60% | -$65.7K |
|
|
MODN
6140
DELISTED
MODEL N, INC.
MODN
| $47K | ﹤0.01% |
1,761
+616
| +54% | +$14.8K |
|
6141
Brookfield Renewable
BEPC
$5.86B
| $46K | ﹤0.01% |
+1,616
| New | +$41.2K |
|
|
SRTA
6142
Strata Critical Medical Inc
SRTA
$421M
| $46K | ﹤0.01% |
+13,131
| New | +$37.7K |
|
6143
Bloomin' Brands
BLMN
$754M
| $46K | ﹤0.01% |
+1,639
| New | +$39.8K |
|
6144
PUT
Bioventus
BVS
$889M
| $46K | ﹤0.01% |
8,900
+8,400
| +1,680% | +$33.2K |
|
6145
DXC Technology
DXC
$1.91B
| $46K | ﹤0.01% |
+2,055
| New | +$45.7K |
|
|
GB
6146
CALL
DELISTED
Global Blue Group Holding
GB
| $46K | ﹤0.01% |
9,800
+4,000
| +69% | +$20.1K |
|
6147
CALL
Gray Television
GTN
$437M
| $46K | ﹤0.01% |
+5,200
| New | +$38.7K |
|
|
NINE
6148
PUT
DELISTED
Nine Energy Service
NINE
| $46K | ﹤0.01% |
17,500
+6,200
| +55% | +$17.9K |
|
6149
CALL
Regency Centers
REG
$14.9B
| $46K | ﹤0.01% |
+700
| New | +$43.3K |
|
6150
CALL
State Street Multi-Asset Real Return ETF
RLY
$1.26B
| $46K | ﹤0.01% |
1,100
| – | – |
|
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.