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 | |
|---|---|---|---|---|---|---|
5926
Clarus
CLAR
$123M
| $59K | ﹤0.01% |
8,584
-720
| -8% | -$4.23K |
|
5927
Cooper-Standard Automotive
CPS
$514M
| $59K | ﹤0.01% |
3,059
-5,492
| -64% | -$87.6K |
|
5928
Funko
FNKO
$338M
| $59K | ﹤0.01% |
7,751
-1,268
| -14% | -$9.16K |
|
5929
PUT
Global Partners
GLP
$1.66B
| $59K | ﹤0.01% |
1,400
+1,300
| +1,300% | +$44.6K |
|
5930
PUT
Centrus Energy
LEU
$3.48B
| $59K | ﹤0.01% |
1,100
-7,500
| -87% | -$392K |
|
5931
CALL
Ocular Therapeutix
OCUL
$1.85B
| $59K | ﹤0.01% |
13,400
-41,800
| -76% | -$124K |
|
5932
CALL
Banco Santander
SAN
$202B
| $59K | ﹤0.01% |
14,400
-45,800
| -76% | -$179K |
|
5933
CALL
TriNet
TNET
$3.29B
| $59K | ﹤0.01% |
500
-5,900
| -92% | -$674K |
|
5934
PUT
Thomson Reuters
TRI
$43.1B
| $59K | ﹤0.01% |
1,181
-22,941
| -95% | -$3.1M |
|
5935
PUT
Arrow Financial
AROW
$660M
| $58K | ﹤0.01% |
+2,100
| New | +$49K |
|
5936
PUT
Axogen
AXGN
$2.2B
| $58K | ﹤0.01% |
+8,500
| New | +$47.3K |
|
5937
CAE Inc. Common Shares
CAE
$8.31B
| $58K | ﹤0.01% |
+2,711
| New | +$57.8K |
|
5938
CALL
Cars.com
CARS
$664M
| $58K | ﹤0.01% |
3,100
+2,800
| +933% | +$50.3K |
|
|
VISN
5939
PUT
Vistance Networks Inc
VISN
$2.64B
| $58K | ﹤0.01% |
20,800
+18,500
| +804% | +$40K |
|
5940
PUT
Cushman & Wakefield Ltd
CWK
$3.23B
| $58K | ﹤0.01% |
+5,400
| New | +$45K |
|
|
GOOD
5941
CALL
Gladstone Commercial Corp
GOOD
$606M
| $58K | ﹤0.01% |
4,400
+2,500
| +132% | +$31.3K |
|
|
KC
5942
Kingsoft Cloud Holdings
KC
$3.04B
| $58K | ﹤0.01% |
15,595
+11,876
| +319% | +$54.2K |
|
5943
Provident Financial Services
PFS
$3.24B
| $58K | ﹤0.01% |
+3,244
| New | +$50.9K |
|
5944
PUT
Rekor Systems
REKR
$84.6M
| $58K | ﹤0.01% |
17,500
+9,800
| +127% | +$27.9K |
|
|
TPIC
5945
DELISTED
TPI Composites
TPIC
| $58K | ﹤0.01% |
14,087
+13,670
| +3,278% | +$35.6K |
|
5946
Upland Software
UPLD
$13.6M
| $58K | ﹤0.01% |
+1,371
| New | +$59.3K |
|
5947
Yext
YEXT
$552M
| $58K | ﹤0.01% |
+9,887
| New | +$60.8K |
|
|
CMLS
5948
CALL
DELISTED
Cumulus Media Inc. Class A Common Stock
CMLS
| $58K | ﹤0.01% |
11,000
-3,800
| -26% | -$19.2K |
|
5949
CALL
A.O. Smith
AOS
$8.24B
| $57K | ﹤0.01% |
700
-34,900
| -98% | -$2.57M |
|
5950
CALL
Backblaze
BLZE
$758M
| $57K | ﹤0.01% |
7,600
-3,600
| -32% | -$22.7K |
|
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.