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 | |
|---|---|---|---|---|---|---|
|
EFOR
3801
CALL
Everforth Inc
EFOR
$941M
| $451K | ﹤0.01% |
4,700
+3,800
| +422% | +$332K |
|
3802
CALL
Brady Corp
BRC
$4.63B
| $451K | ﹤0.01% |
7,700
+5,300
| +221% | +$292K |
|
3803
PUT
Gartner
IT
$10.4B
| $451K | ﹤0.01% |
1,000
-2,600
| -72% | -$1.04M |
|
3804
PUT
Weatherford International
WFRD
$6.03B
| $450K | ﹤0.01% |
4,600
-13,100
| -74% | -$1.22M |
|
3805
PUT
AMN Healthcare
AMN
$1.33B
| $449K | ﹤0.01% |
6,000
+4,300
| +253% | +$308K |
|
3806
Canadian Pacific Kansas City
CP
$81.5B
| $449K | ﹤0.01% |
5,690
-20,322
| -78% | -$1.49M |
|
3807
PUT
CNX Resources
CNX
$4.8B
| $448K | ﹤0.01% |
22,400
-11,800
| -35% | -$252K |
|
3808
PUT
Grand Canyon Education
LOPE
$4B
| $448K | ﹤0.01% |
+3,400
| New | +$442K |
|
3809
CALL
TMC The Metals Company
TMC
$1.56B
| $448K | ﹤0.01% |
407,600
+103,400
| +34% | +$107K |
|
3810
XP
XP
$8.75B
| $448K | ﹤0.01% |
+17,217
| New | +$393K |
|
3811
Cedar Fair
FUN
$1.85B
| $447K | ﹤0.01% |
11,240
+5,808
| +107% | +$218K |
|
3812
CALL
Magnolia Oil & Gas
MGY
$5.57B
| $447K | ﹤0.01% |
21,000
-6,300
| -23% | -$138K |
|
3813
CALL
Selective Insurance
SIGI
$5.61B
| $447K | ﹤0.01% |
+4,500
| New | +$462K |
|
3814
PUT
Energy Fuels
UUUU
$2.82B
| $447K | ﹤0.01% |
62,200
-17,300
| -22% | -$134K |
|
3815
PUT
Autohome
ATHM
$2.65B
| $446K | ﹤0.01% |
15,900
-76,900
| -83% | -$2.12M |
|
3816
Citizens Financial Group
CFG
$30.6B
| $446K | ﹤0.01% |
+13,471
| New | +$371K |
|
3817
CALL
Bausch + Lomb
BLCO
$5.95B
| $445K | ﹤0.01% |
26,100
-4,900
| -16% | -$78.8K |
|
3818
Levi Strauss
LEVI
$9.76B
| $445K | ﹤0.01% |
26,927
+20,481
| +318% | +$304K |
|
3819
CALL
Main Street Capital
MAIN
$5.11B
| $445K | ﹤0.01% |
10,300
-1,900
| -16% | -$77.6K |
|
3820
PUT
Alamos Gold
AGI
$12.1B
| $444K | ﹤0.01% |
33,000
+3,300
| +11% | +$43.2K |
|
3821
PUT
Eldorado Gold
EGO
$8.32B
| $444K | ﹤0.01% |
34,300
+17,900
| +109% | +$201K |
|
3822
CALL
Structure Therapeutics
GPCR
$3.4B
| $444K | ﹤0.01% |
+10,900
| New | +$625K |
|
|
AD
3823
PUT
Array Digital Infrastructure
AD
$3.03B
| $444K | ﹤0.01% |
10,700
-16,400
| -61% | -$695K |
|
3824
Open Text
OTEX
$5.97B
| $443K | ﹤0.01% |
10,545
+4,412
| +72% | +$166K |
|
3825
PUT
Rocket Pharmaceuticals
RCKT
$347M
| $443K | ﹤0.01% |
14,800
-33,900
| -70% | -$748K |
|
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.