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 | |
|---|---|---|---|---|---|---|
1726
PUT
KeyCorp
KEY
$24.3B
| $4.13M | ﹤0.01% |
286,900
-219,400
| -43% | -$2.61M |
|
|
JPGE
1727
PUT
DELISTED
JPMorgan Diversified Return Global Equity ETF
JPGE
| $4.13M | ﹤0.01% |
75,200
+16,000
| +27% | +$879K |
|
1728
CALL
Altimmune
ALT
$539M
| $4.13M | ﹤0.01% |
367,000
+340,900
| +1,306% | +$1.42M |
|
1729
PUT
Lumentum
LITE
$59.4B
| $4.13M | ﹤0.01% |
78,700
+27,800
| +55% | +$1.21M |
|
1730
PUT
Evolent Health
EVH
$475M
| $4.11M | ﹤0.01% |
124,300
+118,600
| +2,081% | +$3.36M |
|
1731
CALL
Landstar System
LSTR
$6.8B
| $4.11M | ﹤0.01% |
21,200
+1,900
| +10% | +$336K |
|
|
K
1732
CALL
DELISTED
Kellanova
K
| $4.1M | ﹤0.01% |
150,300
+24,204
| +19% | +$1.26M |
|
1733
CALL
Knight Transportation
KNX
$11.8B
| $4.09M | ﹤0.01% |
71,000
-1,300
| -2% | -$68.1K |
|
1734
PUT
Cracker Barrel
CBRL
$1.2B
| $4.08M | ﹤0.01% |
53,000
-300
| -0.6% | -$21.5K |
|
1735
PUT
Dorian LPG
LPG
$1.94B
| $4.08M | ﹤0.01% |
93,100
+82,000
| +739% | +$3.05M |
|
1736
PUT
AGNC Investment
AGNC
$12.3B
| $4.08M | ﹤0.01% |
416,200
-46,000
| -10% | -$404K |
|
1737
PUT
Canadian Pacific Kansas City
CP
$82B
| $4.08M | ﹤0.01% |
51,600
-10,100
| -16% | -$739K |
|
1738
CALL
Hartford Financial Services
HIG
$38.5B
| $4.08M | ﹤0.01% |
50,700
+14,300
| +39% | +$1.08M |
|
1739
Devon Energy
DVN
$51.9B
| $4.07M | ﹤0.01% |
89,941
-25,027
| -22% | -$1.15M |
|
1740
CALL
United States Natural Gas Fund
UNG
$470M
| $4.07M | ﹤0.01% |
200,475
-34,125
| -15% | -$849K |
|
1741
Golar LNG
GLNG
$4.95B
| $4.06M | ﹤0.01% |
176,796
+126,586
| +252% | +$2.84M |
|
|
RDFN
1742
CALL
DELISTED
Redfin
RDFN
| $4.06M | ﹤0.01% |
393,300
+235,100
| +149% | +$1.64M |
|
1743
SAP
SAP
$187B
| $4.06M | ﹤0.01% |
26,249
+13,780
| +111% | +$1.99M |
|
|
AYX
1744
DELISTED
Alteryx Inc
AYX
| $4.05M | ﹤0.01% |
85,948
-128,328
| -60% | -$4.98M |
|
1745
CALL
dLocal
DLO
$4.26B
| $4.05M | ﹤0.01% |
229,100
+107,000
| +88% | +$1.91M |
|
1746
PUT
Huntington Bancshares
HBAN
$35.1B
| $4.05M | ﹤0.01% |
318,400
+29,000
| +10% | +$317K |
|
1747
CALL
nCino
NCNO
$1.81B
| $4.04M | ﹤0.01% |
120,300
+30,900
| +35% | +$920K |
|
1748
PUT
Ovintiv
OVV
$17.7B
| $4.04M | ﹤0.01% |
92,100
+3,900
| +4% | +$178K |
|
1749
CALL
Regions Financial
RF
$26.3B
| $4.04M | ﹤0.01% |
208,700
-44,700
| -18% | -$742K |
|
1750
CALL
Republic Services
RSG
$66.7B
| $4.04M | ﹤0.01% |
24,500
+16,100
| +192% | +$2.5M |
|
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.