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 | |
|---|---|---|---|---|---|---|
4626
CALL
Bally's
BALY
$708M
| $178K | ﹤0.01% |
10,000
-5,000
| -33% | -$88.2K |
|
|
DX
4627
CALL
Dynex Capital
DX
$3.17B
| $178K | ﹤0.01% |
14,100
-18,900
| -57% | -$236K |
|
4628
CALL
EyePoint Inc
EYPT
$999M
| $178K | ﹤0.01% |
24,000
-6,200
| -21% | -$57.7K |
|
4629
CALL
HUB Group
HUBG
$2.92B
| $178K | ﹤0.01% |
4,000
-8,600
| -68% | -$401K |
|
4630
CALL
Medallion Financial
MFIN
$230M
| $178K | ﹤0.01% |
19,000
+5,700
| +43% | +$53.1K |
|
4631
Rackspace Technology
RXT
$960M
| $178K | ﹤0.01% |
+80,920
| New | +$204K |
|
4632
CALL
SFL Corp
SFL
$1.61B
| $178K | ﹤0.01% |
17,500
-29,900
| -63% | -$319K |
|
4633
PUT
Similarweb
SMWB
$627M
| $178K | ﹤0.01% |
12,600
| – | – |
|
4634
PUT
A.O. Smith
AOS
$8.55B
| $177K | ﹤0.01% |
2,600
-1,500
| -37% | -$114K |
|
4635
Crescent Energy
CRGY
$3.65B
| $177K | ﹤0.01% |
12,151
-18,462
| -60% | -$250K |
|
4636
PUT
Equinox Gold
EQX
$7.07B
| $177K | ﹤0.01% |
35,300
-24,600
| -41% | -$137K |
|
4637
CALL
Loews
L
$24.5B
| $177K | ﹤0.01% |
2,100
-2,000
| -49% | -$165K |
|
|
MRSN
4638
PUT
DELISTED
Mersana Therapeutics
MRSN
| $177K | ﹤0.01% |
4,976
-152
| -3% | -$7.86K |
|
4639
Murphy Oil
MUR
$5.55B
| $177K | ﹤0.01% |
5,858
+2,218
| +61% | +$71.3K |
|
4640
CALL
FreightCar America
RAIL
$263M
| $177K | ﹤0.01% |
19,800
+16,400
| +482% | +$184K |
|
4641
CALL
Laser Photonics
LASE
$48.5M
| $176K | ﹤0.01% |
+30,600
| New | +$190K |
|
4642
CALL
Smith & Nephew
SNN
$13.7B
| $176K | ﹤0.01% |
+7,200
| New | +$191K |
|
4643
GoPro
GPRO
$120M
| $175K | ﹤0.01% |
161,128
+80,753
| +100% | +$103K |
|
4644
CALL
Utz Brands
UTZ
$1.24B
| $175K | ﹤0.01% |
11,200
-23,000
| -67% | -$389K |
|
|
SW
4645
Smurfit Westrock
SW
$25.3B
| $175K | ﹤0.01% |
3,261
+827
| +34% | +$42.1K |
|
|
ITCI
4646
CALL
DELISTED
Intra-Cellular Therapies Inc.
ITCI
| $175K | ﹤0.01% |
2,100
-21,200
| -91% | -$1.74M |
|
4647
Schrodinger
SDGR
$1.13B
| $174K | ﹤0.01% |
9,068
+2,150
| +31% | +$41.8K |
|
4648
US Bancorp
USB
$97.9B
| $174K | ﹤0.01% |
+3,646
| New | +$179K |
|
|
PENG
4649
CALL
Penguin Solutions Inc
PENG
$2.24B
| $174K | ﹤0.01% |
9,100
-32,200
| -78% | -$588K |
|
4650
Global X Cybersecurity ETF
BUG
$1.25B
| $173K | ﹤0.01% |
5,415
-13,818
| -72% | -$448K |
|
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.