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 | |
|---|---|---|---|---|---|---|
|
DVAX
2626
CALL
DELISTED
Dynavax Technologies
DVAX
| $1.48M | ﹤0.01% |
105,800
-900
| -0.8% | -$12.5K |
|
2627
CALL
LendingTree
TREE
$544M
| $1.48M | ﹤0.01% |
48,800
+5,800
| +13% | +$105K |
|
2628
Western Union
WU
$2.57B
| $1.48M | ﹤0.01% |
123,956
-10,339
| -8% | -$126K |
|
2629
EPAM Systems
EPAM
$4.69B
| $1.48M | ﹤0.01% |
+4,961
| New | +$1.26M |
|
2630
PUT
Campbell Soup
CPB
$6.51B
| $1.47M | ﹤0.01% |
34,100
-66,500
| -66% | -$2.74M |
|
2631
PUT
Archer Aviation
ACHR
$3.64B
| $1.47M | ﹤0.01% |
239,800
+175,900
| +275% | +$999K |
|
2632
PUT
FS KKR Capital
FSK
$2.98B
| $1.47M | ﹤0.01% |
73,700
-14,200
| -16% | -$279K |
|
2633
CALL
BlackBerry
BB
$5.01B
| $1.47M | ﹤0.01% |
415,300
-230,400
| -36% | -$865K |
|
2634
CALL
Huntsman Corp
HUN
$2.24B
| $1.47M | ﹤0.01% |
58,500
+18,600
| +47% | +$452K |
|
2635
Vanguard World Funds Extended Duration ETF
EDV
$3.3B
| $1.47M | ﹤0.01% |
18,138
+5,326
| +42% | +$381K |
|
2636
PUT
Nordic American Tanker
NAT
$1.37B
| $1.47M | ﹤0.01% |
349,800
+107,800
| +45% | +$459K |
|
2637
CALL
LGI Homes
LGIH
$1.4B
| $1.46M | ﹤0.01% |
11,000
+2,400
| +28% | +$266K |
|
2638
CALL
Fluence Energy
FLNC
$1.78B
| $1.46M | ﹤0.01% |
61,300
+44,800
| +272% | +$943K |
|
2639
CALL
CoreCivic
CXW
$3.1B
| $1.46M | ﹤0.01% |
100,500
+68,700
| +216% | +$908K |
|
2640
PUT
Hewlett Packard
HPE
$63.2B
| $1.46M | ﹤0.01% |
86,000
+16,000
| +23% | +$261K |
|
2641
CALL
Rocket Pharmaceuticals
RCKT
$348M
| $1.46M | ﹤0.01% |
48,700
+20,100
| +70% | +$444K |
|
2642
CALL
Macerich
MAC
$7.32B
| $1.46M | ﹤0.01% |
94,500
-4,400
| -4% | -$52.4K |
|
2643
Algoma Steel
ASTL
$455M
| $1.46M | ﹤0.01% |
145,280
+57,549
| +66% | +$445K |
|
2644
CALL
JFrog
FROG
$9.71B
| $1.46M | ﹤0.01% |
42,100
+6,200
| +17% | +$168K |
|
2645
CALL
Beazer Homes USA
BZH
$907M
| $1.46M | ﹤0.01% |
43,100
+25,200
| +141% | +$689K |
|
2646
PUT
Watsco Inc
WSO
$14.9B
| $1.46M | ﹤0.01% |
3,400
-3,500
| -51% | -$1.36M |
|
2647
PUT
Allegiant Air
ALGT
$2.64B
| $1.45M | ﹤0.01% |
17,600
+16,100
| +1,073% | +$1.16M |
|
2648
PUT
Ardmore Shipping
ASC
$678M
| $1.45M | ﹤0.01% |
103,100
+36,600
| +55% | +$495K |
|
2649
CALL
Jazz Pharmaceuticals
JAZZ
$15.9B
| $1.45M | ﹤0.01% |
11,800
-5,100
| -30% | -$636K |
|
2650
Under Armour
UAA
$3B
| $1.45M | ﹤0.01% |
164,995
-18,182
| -10% | -$140K |
|
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.