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 | |
|---|---|---|---|---|---|---|
1501
PUT
Star Bulk Carriers
SBLK
$3.14B
| $5.29M | ﹤0.01% |
248,700
-108,300
| -30% | -$2.13M |
|
1502
iShares Russell 1000 Value ETF
IWD
$82B
| $5.26M | ﹤0.01% |
+31,840
| New | +$4.92M |
|
|
HTGCR
1503
PUT
DELISTED
HERCULES TECHNOLOGY GROWTH CAP INC TRANS RGTS TO PUR COM STK
HTGCR
| $5.26M | ﹤0.01% |
315,400
+263,100
| +503% | +$4.39M |
|
1504
CALL
CAVA Group
CAVA
$7.22B
| $5.26M | ﹤0.01% |
122,300
-64,300
| -34% | -$2.24M |
|
1505
CALL
Incyte
INCY
$23.5B
| $5.25M | ﹤0.01% |
83,700
+52,400
| +167% | +$2.96M |
|
1506
PUT
Winnebago Industries
WGO
$870M
| $5.25M | ﹤0.01% |
72,100
-14,500
| -17% | -$931K |
|
1507
CALL
DigitalBridge
DBRG
$2.94B
| $5.25M | ﹤0.01% |
312,100
-23,700
| -7% | -$390K |
|
1508
PUT
Peloton Interactive
PTON
$2.63B
| $5.25M | ﹤0.01% |
861,600
-230,800
| -21% | -$1.24M |
|
1509
PUT
Toronto Dominion Bank
TD
$198B
| $5.25M | ﹤0.01% |
81,200
+37,100
| +84% | +$2.22M |
|
1510
CALL
InMode
INMD
$872M
| $5.23M | ﹤0.01% |
235,200
+90,200
| +62% | +$2.02M |
|
1511
CALL
Check Point Software Technologies
CHKP
$13.3B
| $5.22M | ﹤0.01% |
34,200
+26,600
| +350% | +$3.76M |
|
1512
CALL
Global E Online
GLBE
$6.08B
| $5.22M | ﹤0.01% |
131,800
+51,900
| +65% | +$1.87M |
|
1513
PUT
Omnicom Group
OMC
$22.7B
| $5.21M | ﹤0.01% |
60,200
-1,700
| -3% | -$134K |
|
|
MASI
1514
PUT
DELISTED
Masimo
MASI
| $5.2M | ﹤0.01% |
44,400
-12,500
| -22% | -$1.17M |
|
1515
PAR Technology
PAR
$637M
| $5.18M | ﹤0.01% |
118,947
+117,485
| +8,036% | +$4.41M |
|
1516
Hershey
HSY
$35.4B
| $5.17M | ﹤0.01% |
27,729
-8,398
| -23% | -$1.59M |
|
1517
PUT
Bank of Hawaii
BOH
$3.33B
| $5.17M | ﹤0.01% |
71,300
-11,500
| -14% | -$660K |
|
1518
Antero Resources
AR
$10.9B
| $5.17M | ﹤0.01% |
227,770
+45,934
| +25% | +$1.16M |
|
1519
CALL
Galicia Financial Group
GGAL
$7.92B
| $5.15M | ﹤0.01% |
298,100
+9,800
| +3% | +$139K |
|
1520
PUT
Northern Trust
NTRS
$22.2B
| $5.14M | ﹤0.01% |
60,900
+10,500
| +21% | +$776K |
|
|
JPGE
1521
CALL
DELISTED
JPMorgan Diversified Return Global Equity ETF
JPGE
| $5.14M | ﹤0.01% |
93,500
+40,700
| +77% | +$2.24M |
|
1522
Lyft
LYFT
$5.39B
| $5.13M | ﹤0.01% |
+341,977
| New | +$3.98M |
|
1523
CALL
OneMain Financial
OMF
$6.9B
| $5.13M | ﹤0.01% |
104,200
+76,000
| +270% | +$3.1M |
|
1524
CALL
Nexstar Media Group
NXST
$5.6B
| $5.13M | ﹤0.01% |
32,700
+18,600
| +132% | +$2.72M |
|
1525
CALL
Vanguard FTSE Europe ETF
VGK
$30B
| $5.12M | ﹤0.01% |
85,500
-39,900
| -32% | -$2.39M |
|
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.