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 | |
|---|---|---|---|---|---|---|
2651
PUT
Modine Manufacturing
MOD
$12.8B
| $1.22M | ﹤0.01% |
10,500
+100
| +1% | +$12.9K |
|
2652
PUT
Vanguard S&P 500 Growth ETF
VOOG
$25.4B
| $1.22M | ﹤0.01% |
20,400
-43,200
| -68% | -$2.59M |
|
|
PMT
2653
PUT
PennyMac Mortgage Investment
PMT
$849M
| $1.22M | ﹤0.01% |
96,600
+4,100
| +4% | +$55.5K |
|
2654
PUT
Bausch + Lomb
BLCO
$5.77B
| $1.22M | ﹤0.01% |
67,300
-53,000
| -44% | -$1.03M |
|
2655
PUT
Aehr Test Systems
AEHR
$2.48B
| $1.21M | ﹤0.01% |
72,800
-5,900
| -7% | -$78.7K |
|
2656
CALL
Array Technologies
ARRY
$818M
| $1.21M | ﹤0.01% |
200,300
-502,500
| -71% | -$3.2M |
|
2657
CALL
Rollins
ROL
$18.6B
| $1.21M | ﹤0.01% |
26,100
+10,900
| +72% | +$534K |
|
|
JNPR
2658
DELISTED
Juniper Networks
JNPR
| $1.21M | ﹤0.01% |
32,253
+10,932
| +51% | +$414K |
|
2659
Vanguard FTSE Emerging Markets ETF
VWO
$119B
| $1.21M | ﹤0.01% |
27,366
-11,793
| -30% | -$548K |
|
2660
PUT
Hawaiian Electric Industries
HE
$2.33B
| $1.2M | ﹤0.01% |
123,100
-238,500
| -66% | -$2.41M |
|
2661
PUT
Ecolab
ECL
$75.6B
| $1.2M | ﹤0.01% |
5,100
+4,000
| +364% | +$994K |
|
2662
PUT
Hecla Mining
HL
$10.2B
| $1.2M | ﹤0.01% |
243,500
+42,700
| +21% | +$255K |
|
2663
CALL
Bitwise Bitcoin ETF
BITB
$2.46B
| $1.19M | ﹤0.01% |
+23,500
| New | +$1.06M |
|
|
HSAI
2664
PUT
Hesai Group
HSAI
$2.29B
| $1.19M | ﹤0.01% |
86,400
+80,100
| +1,271% | +$564K |
|
2665
RxSight
RXST
$215M
| $1.19M | ﹤0.01% |
+34,730
| New | +$1.57M |
|
2666
Kosmos Energy
KOS
$1.56B
| $1.19M | ﹤0.01% |
348,937
+219,083
| +169% | +$834K |
|
|
NNDM
2667
Nano Dimension
NNDM
$309M
| $1.19M | ﹤0.01% |
481,355
+236,579
| +97% | +$545K |
|
2668
PUT
Designer Brands
DBI
$277M
| $1.19M | ﹤0.01% |
222,900
+202,200
| +977% | +$1.13M |
|
2669
PUT
Infosys
INFY
$45B
| $1.19M | ﹤0.01% |
54,300
-10,300
| -16% | -$230K |
|
2670
CALL
Trustmark
TRMK
$2.73B
| $1.19M | ﹤0.01% |
33,600
-54,300
| -62% | -$1.96M |
|
2671
ZTO Express
ZTO
$18.2B
| $1.19M | ﹤0.01% |
60,791
+51,385
| +546% | +$1.13M |
|
2672
CALL
Jacobs Solutions
J
$15.9B
| $1.19M | ﹤0.01% |
11,312
-1,313
| -10% | -$181K |
|
2673
CALL
Open Text
OTEX
$5.43B
| $1.19M | ﹤0.01% |
41,900
+23,200
| +124% | +$714K |
|
2674
PUT
LendingTree
TREE
$544M
| $1.19M | ﹤0.01% |
30,600
+20,900
| +215% | +$1M |
|
2675
Semtech
SMTC
$11.7B
| $1.18M | ﹤0.01% |
+19,130
| New | +$1.01M |
|
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.