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 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$272M |
| 2 |
Alphabet (Google) Class A
GOOGL
|
+$99M |
| 3 |
NVIDIA
NVDA
|
+$89.9M |
| 4 |
TSMC
TSM
|
+$87.7M |
| 5 |
Amazon
AMZN
|
+$61M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Apple
AAPL
|
+$518M |
| 2 |
Strategy Inc
MSTR
|
+$81.2M |
| 3 |
Alibaba
BABA
|
+$66.7M |
| 4 |
Advanced Micro Devices
AMD
|
+$44.3M |
| 5 |
Uber
UBER
|
+$41.3M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.41% |
| 2 | Consumer Discretionary | 0.22% |
| 3 | Healthcare | 0.17% |
| 4 | Communication Services | 0.15% |
| 5 | Financials | 0.13% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
5626
PUT
Inter&Co
INTR
$2.47B
| $57K | ﹤0.01% |
10,500
-38,500
| -79% | -$200K |
|
5627
PUT
Monro
MNRO
$383M
| $57K | ﹤0.01% |
4,000
-100
| -2% | -$1.91K |
|
|
NIU
5628
Niu Technologies
NIU
$203M
| $57K | ﹤0.01% |
13,977
+13,028
| +1,373% | +$32.5K |
|
5629
PUT
Nektar Therapeutics
NKTR
$2.39B
| $57K | ﹤0.01% |
+5,613
| New | +$73.3K |
|
5630
CALL
Perdoceo Education
PRDO
$1.99B
| $57K | ﹤0.01% |
+2,300
| New | +$61.1K |
|
5631
PUT
Tanger
SKT
$4.67B
| $57K | ﹤0.01% |
1,700
-2,800
| -62% | -$94K |
|
5632
iShares MSCI India Small-Cap ETF
SMIN
$756M
| $57K | ﹤0.01% |
841
+81
| +11% | +$5.53K |
|
|
VERV
5633
DELISTED
Verve Therapeutics
VERV
| $57K | ﹤0.01% |
12,580
+10,349
| +464% | +$69.3K |
|
5634
CALL
Valmont Industries
VMI
$9.3B
| $57K | ﹤0.01% |
200
-1,800
| -90% | -$587K |
|
5635
CALL
VOC Energy
VOC
$50.7M
| $57K | ﹤0.01% |
18,300
+1,600
| +10% | +$6.09K |
|
|
YRD
5636
Yiren Digital
YRD
$98M
| $57K | ﹤0.01% |
+8,290
| New | +$52.1K |
|
5637
PUT
ArcBest
ARCB
$3.23B
| $56K | ﹤0.01% |
800
-53,500
| -99% | -$4.64M |
|
|
EFOR
5638
CALL
Everforth Inc
EFOR
$1.17B
| $56K | ﹤0.01% |
900
| – | – |
|
5639
CALL
Diodes
DIOD
$3.78B
| $56K | ﹤0.01% |
1,300
+400
| +44% | +$21.6K |
|
5640
CALL
VanEck Energy Income ETF
EINC
$78.2M
| $56K | ﹤0.01% |
3,500
+2,700
| +338% | +$265K |
|
5641
PUT
Embecta
EMBC
$216M
| $56K | ﹤0.01% |
4,400
+3,800
| +633% | +$60.8K |
|
|
HPP
5642
CALL
Hudson Pacific Properties
HPP
$747M
| $56K | ﹤0.01% |
2,743
-29,100
| -91% | -$608K |
|
5643
CALL
Lamar Advertising Co
LAMR
$16.2B
| $56K | ﹤0.01% |
500
-1,400
| -74% | -$170K |
|
5644
Oportun Financial
OPRT
$255M
| $56K | ﹤0.01% |
10,304
+7,446
| +261% | +$41K |
|
5645
OraSure Technologies
OSUR
$279M
| $56K | ﹤0.01% |
16,622
+14,440
| +662% | +$53.2K |
|
5646
Invesco Aerospace & Defense ETF
PPA
$8.24B
| $56K | ﹤0.01% |
+484
| New | +$56.9K |
|
|
SEM
5647
DELISTED
Select Medical
SEM
| $56K | ﹤0.01% |
3,387
-1,639
| -33% | -$30.2K |
|
5648
PUT
Seanergy Maritime Holdings
SHIP
$379M
| $56K | ﹤0.01% |
8,900
+6,400
| +256% | +$44.7K |
|
5649
PUT
Trinity Industries
TRN
$2.49B
| $56K | ﹤0.01% |
2,000
+800
| +67% | +$26.8K |
|
5650
PUT
Algoma Steel
ASTL
$406M
| $55K | ﹤0.01% |
10,200
-21,400
| -68% | -$161K |
|
Similar funds
Simplex Trading's Q1 2025 Portfolio in Review
As of Q1 2025, Simplex Trading held 10,070 positions worth $156B, down 13% from $179B the previous quarter. Its ten largest holdings account for 51% of the portfolio.
Simplex Trading withdrew a net $7.93B in Q1 2025, closing 1,547 positions and reducing 3,654 holdings. Its most notable exit was Alibaba, an estimated $66.7M position sold in full.
By sector, the portfolio is most concentrated in Technology at 0.41% of assets, down from 0.68% a quarter earlier, followed by Consumer Discretionary and Healthcare.
Against the trend, Simplex Trading opened a new position in iShares 20+ Year Treasury Bond ETF worth $278M.
- Simplex Trading's largest Q1 2025 buy was iShares 20+ Year Treasury Bond ETF: 3,057,978 shares worth $278M.
- Simplex Trading added most to NVIDIA in Q1 2025, an estimated $89.9M increase.
- Simplex Trading's biggest Q1 2025 reduction was Apple, cutting an estimated $518M.
- Simplex Trading fully exited Alibaba in Q1 2025, selling an estimated $66.7M.
- Simplex Trading's ten largest holdings make up 51% of its $156B portfolio in Q1 2025.
- Simplex Trading opened 1,566 new positions and closed 1,547 in Q1 2025.
- Simplex Trading's portfolio value fell 13% quarter-over-quarter to $156B.
Based on Simplex Trading's 13F filing for Q1 2025, filed 12 May 2025.