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 |
Apple
AAPL
|
+$552M |
| 2 |
Strategy Inc
MSTR
|
+$85.8M |
| 3 |
MSTX
Defiance Daily Target 2x Long MSTR ETF
MSTX
|
+$48.1M |
| 4 |
Intel
INTC
|
+$45.4M |
| 5 |
Uber
UBER
|
+$43M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
NVIDIA
NVDA
|
+$133M |
| 2 |
Pinduoduo
PDD
|
+$82.6M |
| 3 |
Boeing
BA
|
+$49.8M |
| 4 |
KraneShares CSI China Internet ETF
KWEB
|
+$45.1M |
| 5 |
Microsoft
MSFT
|
+$41M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.68% |
| 2 | Consumer Discretionary | 0.23% |
| 3 | Healthcare | 0.19% |
| 4 | Financials | 0.13% |
| 5 | Communication Services | 0.11% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
1951
PUT
Applied Industrial Technologies
AIT
$12.8B
| $2.68M | ﹤0.01% |
11,200
+500
| +5% | +$125K |
|
1952
PUT
Old Dominion Freight Line
ODFL
$48.5B
| $2.68M | ﹤0.01% |
15,200
+3,100
| +26% | +$632K |
|
1953
YieldMax MSTR Option Income Strategy ETF
MSTY
$708M
| $2.68M | ﹤0.01% |
20,345
+20,003
| +5,849% | +$3.16M |
|
|
CTRA
1954
PUT
DELISTED
Coterra Energy
CTRA
| $2.67M | ﹤0.01% |
104,600
-24,000
| -19% | -$597K |
|
1955
PUT
AnaptysBio
ANAB
$1.6B
| $2.67M | ﹤0.01% |
201,600
+195,100
| +3,002% | +$4.73M |
|
1956
CALL
Opendoor
OPEN
$3.69B
| $2.67M | ﹤0.01% |
1,722,463
+866,656
| +101% | +$1.57M |
|
1957
CALL
Royalty Pharma
RPRX
$26.1B
| $2.67M | ﹤0.01% |
104,500
-2,700
| -3% | -$71.6K |
|
1958
CALL
Infosys
INFY
$45B
| $2.66M | ﹤0.01% |
121,400
-17,300
| -12% | -$387K |
|
1959
PUT
Central Garden & Pet Co Class A
CENTA
$2.41B
| $2.66M | ﹤0.01% |
68,500
-22,800
| -25% | -$726K |
|
1960
PUT
Group 1 Automotive
GPI
$3.94B
| $2.65M | ﹤0.01% |
6,300
-13,300
| -68% | -$5.26M |
|
1961
KB Home
KBH
$3.48B
| $2.65M | ﹤0.01% |
+40,393
| New | +$3.14M |
|
1962
PUT
Clover Health Investments
CLOV
$2.28B
| $2.65M | ﹤0.01% |
842,400
+376,000
| +81% | +$1.34M |
|
1963
CALL
iQIYI
IQ
$1.18B
| $2.65M | ﹤0.01% |
1,320,300
+138,200
| +12% | +$327K |
|
1964
CALL
Leidos
LDOS
$14.1B
| $2.65M | ﹤0.01% |
18,400
+3,000
| +19% | +$499K |
|
1965
CALL
Silicon Motion
SIMO
$9.19B
| $2.64M | ﹤0.01% |
48,900
+13,400
| +38% | +$750K |
|
1966
CALL
The RealReal
REAL
$1.34B
| $2.64M | ﹤0.01% |
241,700
+192,900
| +395% | +$1.03M |
|
|
ACB
1967
CALL
Aurora Cannabis
ACB
$165M
| $2.63M | ﹤0.01% |
620,200
-1,000
| -0.2% | -$4.91K |
|
1968
PUT
Herbalife
HLF
$1.23B
| $2.63M | ﹤0.01% |
393,800
+61,600
| +19% | +$458K |
|
1969
The Mosaic Company
MOS
$7.09B
| $2.63M | ﹤0.01% |
107,052
+36,245
| +51% | +$948K |
|
1970
CALL
SS&C Technologies
SSNC
$17.8B
| $2.63M | ﹤0.01% |
34,700
+32,500
| +1,477% | +$2.43M |
|
1971
CALL
Listed Funds Trust Roundhill Magnificent Seven ETF
MAGS
$3.91B
| $2.63M | ﹤0.01% |
48,300
+29,700
| +160% | +$1.52M |
|
1972
Signet Jewelers
SIG
$3.55B
| $2.62M | ﹤0.01% |
32,449
+12,136
| +60% | +$1.13M |
|
1973
CALL
Weave Communications
WEAV
$491M
| $2.62M | ﹤0.01% |
164,400
+162,900
| +10,860% | +$2.29M |
|
1974
CALL
Modine Manufacturing
MOD
$12.8B
| $2.61M | ﹤0.01% |
22,500
+11,400
| +103% | +$1.47M |
|
1975
CALL
Consolidated Edison
ED
$41.6B
| $2.6M | ﹤0.01% |
29,200
-20,900
| -42% | -$2.06M |
|
Similar funds
Simplex Trading's Q4 2024 Portfolio in Review
As of Q4 2024, Simplex Trading held 10,008 positions worth $179B, up 4.8% from $170B the previous quarter. Its ten largest holdings account for 49% of the portfolio.
Simplex Trading's Q4 2024 filing shows 1,520 new, 3,222 increased, 3,616 reduced and 1,504 closed positions. Its largest new stake was Strategy Inc: 285,022 shares worth $82.5M. The largest sale was NVIDIA, an estimated $133M.
By sector, the portfolio is most concentrated in Technology at 0.68% of assets, up from 0.4% a quarter earlier, followed by Consumer Discretionary and Healthcare.
- Simplex Trading's largest Q4 2024 buy was Strategy Inc: 285,022 shares worth $82.5M.
- Simplex Trading added most to Apple in Q4 2024, an estimated $552M increase.
- Simplex Trading's biggest Q4 2024 reduction was NVIDIA, cutting an estimated $133M.
- Simplex Trading fully exited Pinduoduo in Q4 2024, selling an estimated $82.6M.
- Simplex Trading's ten largest holdings make up 49% of its $179B portfolio in Q4 2024.
- Simplex Trading opened 1,520 new positions and closed 1,504 in Q4 2024.
- Simplex Trading's portfolio value rose 4.8% quarter-over-quarter to $179B.
Based on Simplex Trading's 13F filing for Q4 2024, filed 11 Feb 2025.