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 | |
|---|---|---|---|---|---|---|
3876
CALL
Sportradar
SRAD
$4.38B
| $422K | ﹤0.01% |
38,200
+28,700
| +302% | +$282K |
|
|
QLTB
3877
PUT
DELISTED
ISHARES BAA BA RATED CORP BOND FUND
QLTB
| $422K | ﹤0.01% |
4,100
-6,700
| -62% | -$690K |
|
|
CRON
3878
Cronos Group
CRON
$1.06B
| $421K | ﹤0.01% |
201,821
+74,814
| +59% | +$145K |
|
3879
CALL
Innoviz Technologies
INVZ
$99.5M
| $421K | ﹤0.01% |
166,500
+22,500
| +16% | +$43.1K |
|
3880
CALL
Credo Technology Group
CRDO
$35.9B
| $420K | ﹤0.01% |
21,600
-9,500
| -31% | -$161K |
|
3881
PUT
Lufax Holding
LU
$1.33B
| $420K | ﹤0.01% |
137,000
+97,275
| +245% | +$362K |
|
|
CRESY
3882
Cresud
CRESY
$808M
| $419K | ﹤0.01% |
+44,602
| New | +$365K |
|
3883
CALL
Piper Sandler
PIPR
$5.24B
| $419K | ﹤0.01% |
9,600
-25,200
| -72% | -$959K |
|
3884
Pulse Biosciences
PLSE
$2.45B
| $419K | ﹤0.01% |
+34,293
| New | +$237K |
|
|
SUM
3885
CALL
DELISTED
Summit Materials, Inc. Class A Common Stock
SUM
| $419K | ﹤0.01% |
10,900
+10,100
| +1,263% | +$350K |
|
3886
CALL
FTI Consulting
FCN
$5.04B
| $418K | ﹤0.01% |
2,100
+100
| +5% | +$20.7K |
|
|
VNET
3887
CALL
VNET Group
VNET
$1.92B
| $418K | ﹤0.01% |
+145,900
| New | +$439K |
|
|
ERF
3888
PUT
DELISTED
Enerplus Corporation
ERF
| $418K | ﹤0.01% |
27,300
+15,500
| +131% | +$252K |
|
|
CIM
3889
CALL
Chimera Investment
CIM
$1.06B
| $417K | ﹤0.01% |
27,867
+15,434
| +124% | +$233K |
|
|
AMED
3890
DELISTED
Amedisys
AMED
| $416K | ﹤0.01% |
4,378
+2,119
| +94% | +$198K |
|
3891
CALL
Gogo Inc
GOGO
$550M
| $416K | ﹤0.01% |
41,100
+700
| +2% | +$7.43K |
|
|
MRC
3892
DELISTED
MRC Global
MRC
| $416K | ﹤0.01% |
+37,810
| New | +$396K |
|
3893
REX American Resources
REX
$1.4B
| $416K | ﹤0.01% |
+17,626
| New | +$353K |
|
3894
PUT
United States Brent Oil Fund
BNO
$724M
| $415K | ﹤0.01% |
15,200
+12,200
| +407% | +$356K |
|
3895
Powell Industries
POWL
$7.32B
| $415K | ﹤0.01% |
14,106
+6,543
| +87% | +$182K |
|
|
RVPH
3896
CALL
DELISTED
REVIVA PHARMA HLDGS INC
RVPH
| $415K | ﹤0.01% |
4,035
+1,895
| +89% | +$170K |
|
|
EBIX
3897
DELISTED
Ebix Inc
EBIX
| $415K | ﹤0.01% |
399,213
+388,611
| +3,665% | +$1.95M |
|
3898
ProShares UltraPro Short Russell2000
SRTY
$78.2M
| $414K | ﹤0.01% |
+3,431
| New | +$628K |
|
3899
PUT
Full Truck Alliance
YMM
$9.64B
| $414K | ﹤0.01% |
59,200
+2,000
| +3% | +$14.1K |
|
|
MTTR
3900
PUT
DELISTED
Matterport, Inc. Class A Common Stock
MTTR
| $413K | ﹤0.01% |
153,700
+100
| +0.1% | +$240 |
|
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.