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 | |
|---|---|---|---|---|---|---|
4801
CALL
DT Midstream
DTM
$13.9B
| $175K | ﹤0.01% |
3,200
-1,500
| -32% | -$82.6K |
|
4802
CALL
First Interstate BancSystem
FIBK
$3.67B
| $175K | ﹤0.01% |
+5,700
| New | +$148K |
|
4803
PUT
Grocery Outlet
GO
$904M
| $175K | ﹤0.01% |
6,500
-5,700
| -47% | -$160K |
|
|
MAG
4804
PUT
DELISTED
MAG Silver
MAG
| $175K | ﹤0.01% |
16,900
+6,000
| +55% | +$64.1K |
|
|
CUTR
4805
PUT
DELISTED
Cutera, Inc.
CUTR
| $175K | ﹤0.01% |
49,900
+44,500
| +824% | +$136K |
|
4806
Direxion Daily S&P 500 High Beta Bear 3X ETF
HIBS
$29.6M
| $174K | ﹤0.01% |
+642
| New | +$280K |
|
4807
CALL
Ouster
OUST
$2.11B
| $174K | ﹤0.01% |
168,700
+14,300
| +9% | +$75K |
|
4808
RPC Inc
RES
$1.13B
| $174K | ﹤0.01% |
23,973
-8,111
| -25% | -$63.5K |
|
4809
SLM Corp
SLM
$4.83B
| $174K | ﹤0.01% |
+9,134
| New | +$138K |
|
|
PENG
4810
PUT
Penguin Solutions Inc
PENG
$2.24B
| $174K | ﹤0.01% |
9,200
+1,000
| +12% | +$17.3K |
|
|
DRD
4811
PUT
DRDGold
DRD
$1.75B
| $173K | ﹤0.01% |
21,800
+9,800
| +82% | +$84.1K |
|
|
GLDD
4812
DELISTED
Great Lakes Dredge & Dock
GLDD
| $173K | ﹤0.01% |
22,533
-181
| -0.8% | -$1.32K |
|
4813
PUT
Ironwood Pharmaceuticals
IRWD
$586M
| $173K | ﹤0.01% |
+15,200
| New | +$150K |
|
4814
PUT
WillScot Mobile Mini Holdings
WSC
$4.37B
| $173K | ﹤0.01% |
3,900
-14,300
| -79% | -$578K |
|
|
NVEI
4815
CALL
DELISTED
Nuvei Corporation Subordinate Voting Shares
NVEI
| $173K | ﹤0.01% |
6,600
-12,100
| -65% | -$232K |
|
4816
PUT
Ambev
ABEV
$47.9B
| $172K | ﹤0.01% |
61,500
-226,700
| -79% | -$612K |
|
4817
PUT
EXL Service
EXLS
$5.46B
| $172K | ﹤0.01% |
5,600
-600
| -10% | -$17K |
|
4818
CALL
Oscar Health
OSCR
$9.22B
| $172K | ﹤0.01% |
18,800
-41,400
| -69% | -$286K |
|
4819
Direxion Daily Technology Bull 3x ETF
TECL
$4.39B
| $172K | ﹤0.01% |
2,579
-7,478
| -74% | -$406K |
|
4820
Inogen
INGN
$174M
| $171K | ﹤0.01% |
31,170
+29,031
| +1,357% | +$153K |
|
4821
CALL
Pediatrix Medical
MD
$2.2B
| $171K | ﹤0.01% |
18,400
+17,600
| +2,200% | +$182K |
|
4822
CALL
Renasant Corp
RNST
$4.01B
| $171K | ﹤0.01% |
+5,100
| New | +$143K |
|
4823
PUT
SS&C Technologies
SSNC
$18.9B
| $171K | ﹤0.01% |
2,800
-5,800
| -67% | -$317K |
|
|
CBIO
4824
Crescent Biopharma
CBIO
$546M
| $170K | ﹤0.01% |
+724
| New | +$113K |
|
4825
Helix Energy Solutions
HLX
$1.34B
| $170K | ﹤0.01% |
+16,581
| New | +$165K |
|
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.