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 | |
|---|---|---|---|---|---|---|
|
UMH
6426
PUT
UMH Properties
UMH
$1.29B
| $28K | ﹤0.01% |
1,500
-500
| -25% | -$9.54K |
|
|
ZH
6427
CALL
Zhihu
ZH
$281M
| $28K | ﹤0.01% |
+8,100
| New | +$30K |
|
6428
PUT
United Parks & Resorts
PRKS
$2.1B
| $28K | ﹤0.01% |
500
-700
| -58% | -$38.4K |
|
|
KLC
6429
KinderCare Learning Companies
KLC
$634M
| $28K | ﹤0.01% |
+1,582
| New | +$37.9K |
|
|
APLT
6430
PUT
DELISTED
Applied Therapeutics
APLT
| $27K | ﹤0.01% |
32,500
-57,300
| -64% | -$359K |
|
6431
CALL
BARK
BARK
$81.8M
| $27K | ﹤0.01% |
755
+685
| +979% | +$24K |
|
6432
CALL
Brink's
BCO
$4.88B
| $27K | ﹤0.01% |
300
| – | – |
|
|
BRAG
6433
Bragg Gaming Group
BRAG
$50.6M
| $27K | ﹤0.01% |
7,375
-12,105
| -62% | -$49.4K |
|
6434
Blue Ridge Bankshares
BRBS
$315M
| $27K | ﹤0.01% |
+8,541
| New | +$26.9K |
|
6435
CALL
Custom Truck One Source
CTOS
$2.31B
| $27K | ﹤0.01% |
+5,700
| New | +$25.8K |
|
6436
CALL
Crexendo
CXDO
$223M
| $27K | ﹤0.01% |
5,300
-3,400
| -39% | -$18K |
|
|
CYBR
6437
DELISTED
CyberArk
CYBR
| $27K | ﹤0.01% |
+82
| New | +$24.9K |
|
6438
CALL
Dimensional US Core Equity Market ETF
DFAU
$12.4B
| $27K | ﹤0.01% |
500
+300
| +150% | +$12.3K |
|
6439
Essex Property Trust
ESS
$18.3B
| $27K | ﹤0.01% |
97
-379
| -80% | -$112K |
|
6440
CALL
Ispire Technology
ISPR
$83.2M
| $27K | ﹤0.01% |
5,400
+2,300
| +74% | +$14.1K |
|
|
NXDR
6441
Nextdoor Holdings
NXDR
$847M
| $27K | ﹤0.01% |
11,433
+3,178
| +38% | +$7.88K |
|
6442
CALL
Kodiak Sciences
KOD
$2.6B
| $27K | ﹤0.01% |
2,800
+2,000
| +250% | +$11.5K |
|
|
6443
PUT
Kodiak Sciences
KOD
$2.6B
| $27K | ﹤0.01% |
2,800
-3,100
| -53% | -$17.8K |
|
|
LTC
6444
PUT
LTC Properties
LTC
$2.06B
| $27K | ﹤0.01% |
800
-1,800
| -69% | -$66.5K |
|
|
MTLS
6445
Materialise
MTLS
$368M
| $27K | ﹤0.01% |
3,967
+3,591
| +955% | +$23.7K |
|
6446
NewAmsterdam Pharma
NAMS
$3.25B
| $27K | ﹤0.01% |
1,074
+1,012
| +1,632% | +$21.5K |
|
6447
PUT
Grupo Aeroportuario Centro Norte
OMAB
$5.16B
| $27K | ﹤0.01% |
400
-1,200
| -75% | -$81.6K |
|
6448
VanEck Merk Gold Trust
OUNZ
$2.51B
| $27K | ﹤0.01% |
1,086
-210
| -16% | -$5.39K |
|
6449
PUT
Pegasystems
PEGA
$5.02B
| $27K | ﹤0.01% |
600
-22,000
| -97% | -$941K |
|
6450
PUT
Scholastic
SCHL
$767M
| $27K | ﹤0.01% |
1,300
+800
| +160% | +$20.3K |
|
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.