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 | |
|---|---|---|---|---|---|---|
5851
CALL
XPEL
XPEL
$1.22B
| $64K | ﹤0.01% |
1,200
-1,100
| -48% | -$59.1K |
|
|
QVCGA
5852
PUT
DELISTED
QVC Group Inc Series A
QVCGA
| $64K | ﹤0.01% |
1,464
-3,594
| -71% | -$123K |
|
|
NVTA
5853
PUT
DELISTED
Invitae Corporation
NVTA
| $64K | ﹤0.01% |
102,500
+4,900
| +5% | +$2.93K |
|
|
AHRT
5854
PUT
AH Realty Trust
AHRT
$536M
| $63K | ﹤0.01% |
5,100
-10,800
| -68% | -$119K |
|
5855
2x Bitcoin ETF
BITX
$925M
| $63K | ﹤0.01% |
+2,792
| New | +$51.2K |
|
5856
CALL
BioLife Solutions
BLFS
$1.55B
| $63K | ﹤0.01% |
3,900
-300
| -7% | -$3.83K |
|
5857
PUT
Brown & Brown
BRO
$23.7B
| $63K | ﹤0.01% |
900
+400
| +80% | +$28.6K |
|
|
DMC
5858
CALL
Del Monte Corp
DMC
$1.41B
| $63K | ﹤0.01% |
2,400
+1,900
| +380% | +$46.8K |
|
5859
CALL
Disc Medicine
IRON
$3.03B
| $63K | ﹤0.01% |
1,100
-13,400
| -92% | -$686K |
|
|
KC
5860
PUT
Kingsoft Cloud Holdings
KC
$3.04B
| $63K | ﹤0.01% |
16,900
-2,900
| -15% | -$13.2K |
|
5861
Mama's Creations
MAMA
$849M
| $63K | ﹤0.01% |
+13,003
| New | +$51.3K |
|
5862
Seres Therapeutics
MCRB
$46.3M
| $63K | ﹤0.01% |
2,266
-944
| -29% | -$24.8K |
|
5863
PUT
Madison Square Garden
MSGE
$3.73B
| $63K | ﹤0.01% |
2,000
-9,900
| -83% | -$308K |
|
5864
Newegg Commerce
NEGG
$270M
| $63K | ﹤0.01% |
2,505
-1,945
| -44% | -$35.3K |
|
5865
Payoneer
PAYO
$2.42B
| $63K | ﹤0.01% |
12,208
-28,612
| -70% | -$158K |
|
|
SFBS
5866
ServisFirst Bancshares
SFBS
$4.88B
| $63K | ﹤0.01% |
+951
| New | +$51.4K |
|
5867
PUT
Viridian Therapeutics
VRDN
$2.2B
| $63K | ﹤0.01% |
+2,900
| New | +$45.8K |
|
5868
VistaGen Therapeutics
VTGN
$9.89M
| $63K | ﹤0.01% |
12,371
+9,907
| +402% | +$37.5K |
|
5869
PUT
World Kinect Corp
WKC
$2.03B
| $63K | ﹤0.01% |
+2,800
| New | +$58.8K |
|
|
AXNX
5870
DELISTED
Axonics, Inc. Common Stock
AXNX
| $63K | ﹤0.01% |
1,021
+24
| +2% | +$1.34K |
|
5871
PUT
AAR Corp
AIR
$5.56B
| $62K | ﹤0.01% |
1,000
+100
| +11% | +$6.42K |
|
5872
CALL
Brookfield Infrastructure Partners
BIP
$19.5B
| $62K | ﹤0.01% |
2,000
-700
| -26% | -$19K |
|
|
CIO
5873
PUT
DELISTED
City Office REIT
CIO
| $62K | ﹤0.01% |
10,300
+500
| +5% | +$2.33K |
|
5874
PUT
Credo Technology Group
CRDO
$37.5B
| $62K | ﹤0.01% |
3,200
-300
| -9% | -$5.1K |
|
5875
Consolidated Water Co
CWCO
$474M
| $62K | ﹤0.01% |
+1,754
| New | +$57.8K |
|
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.