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 | |
|---|---|---|---|---|---|---|
4526
CALL
Seres Therapeutics
MCRB
$45M
| $198K | ﹤0.01% |
11,925
+2,295
| +24% | +$37.3K |
|
4527
CALL
Phreesia
PHR
$689M
| $198K | ﹤0.01% |
7,900
-2,700
| -25% | -$57.7K |
|
|
TE
4528
T1 Energy
TE
$1.04B
| $198K | ﹤0.01% |
+76,875
| New | +$129K |
|
4529
CALL
Collegium Pharmaceutical
COLL
$1.18B
| $197K | ﹤0.01% |
6,900
+2,100
| +44% | +$69.5K |
|
4530
CALL
New York Times
NYT
$12.6B
| $197K | ﹤0.01% |
3,800
-40,000
| -91% | -$2.18M |
|
4531
CALL
US Commodity Index
USCI
$370M
| $197K | ﹤0.01% |
3,000
+2,500
| +500% | +$160K |
|
|
PDCO
4532
PUT
DELISTED
Patterson Companies, Inc.
PDCO
| $197K | ﹤0.01% |
6,400
+4,700
| +276% | +$109K |
|
|
ARCH
4533
CALL
DELISTED
Arch Resources, Inc.
ARCH
| $197K | ﹤0.01% |
35,000
-13,100
| -27% | -$1.99M |
|
4534
PUT
Rocket Pharmaceuticals
RCKT
$343M
| $196K | ﹤0.01% |
15,600
+12,800
| +457% | +$193K |
|
4535
PUT
Royalty Pharma
RPRX
$26.2B
| $196K | ﹤0.01% |
7,700
+3,400
| +79% | +$90.2K |
|
|
SGMO
4536
DELISTED
SANGAMO THERAPEUTICS INC
SGMO
| $196K | ﹤0.01% |
192,538
+77,802
| +68% | +$142K |
|
4537
PUT
BellRing Brands
BRBR
$1.55B
| $195K | ﹤0.01% |
2,600
-900
| -26% | -$63.9K |
|
4538
CALL
Invesco Mortgage Capital
IVR
$759M
| $195K | ﹤0.01% |
24,300
-10,500
| -30% | -$88.1K |
|
|
MFA
4539
PUT
MFA Financial
MFA
$932M
| $195K | ﹤0.01% |
19,200
-7,600
| -28% | -$87.2K |
|
4540
Natural Resource Partners
NRP
$1.31B
| $195K | ﹤0.01% |
+1,763
| New | +$182K |
|
4541
Relay Therapeutics
RLAY
$4B
| $195K | ﹤0.01% |
47,462
+27,036
| +132% | +$147K |
|
4542
Direxion Daily Technology Bull 3x ETF
TECL
$4.39B
| $195K | ﹤0.01% |
+2,162
| New | +$202K |
|
4543
Verisk Analytics
VRSK
$27.9B
| $195K | ﹤0.01% |
711
-4,997
| -88% | -$1.39M |
|
4544
Ero Copper
ERO
$2.64B
| $194K | ﹤0.01% |
+14,424
| New | +$244K |
|
4545
PUT
First Financial Bankshares
FFIN
$5.05B
| $194K | ﹤0.01% |
5,400
+3,800
| +238% | +$147K |
|
4546
CALL
Energy Vault
NRGV
$455M
| $194K | ﹤0.01% |
85,100
+22,100
| +35% | +$36.6K |
|
4547
Acadia Pharmaceuticals
ACAD
$4.51B
| $193K | ﹤0.01% |
+10,543
| New | +$170K |
|
4548
Neogen
NEOG
$2.05B
| $193K | ﹤0.01% |
15,946
+12,118
| +317% | +$170K |
|
4549
CALL
Safe Bulkers
SB
$772M
| $193K | ﹤0.01% |
54,200
+5,900
| +12% | +$24.6K |
|
|
DAY
4550
DELISTED
Dayforce
DAY
| $193K | ﹤0.01% |
+2,667
| New | +$193K |
|
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.