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 | |
|---|---|---|---|---|---|---|
4576
CALL
Ambev
ABEV
$47.9B
| $157K | ﹤0.01% |
67,800
-134,100
| -66% | -$268K |
|
4577
PUT
Cooper-Standard Automotive
CPS
$517M
| $157K | ﹤0.01% |
10,300
+4,900
| +91% | +$73.2K |
|
|
DMC
4578
PUT
Del Monte Corp
DMC
$1.42B
| $157K | ﹤0.01% |
5,100
+2,000
| +65% | +$61.4K |
|
4579
PUT
Jacobs Solutions
J
$16B
| $157K | ﹤0.01% |
1,313
-6,969
| -84% | -$897K |
|
4580
CALL
National Grid
NGG
$79.3B
| $157K | ﹤0.01% |
2,506
-4,593
| -65% | -$270K |
|
|
4581
PUT
National Grid
NGG
$79.3B
| $157K | ﹤0.01% |
2,506
+2,297
| +1,099% | +$135K |
|
4582
PUT
Procept Biorobotics
PRCT
$1.02B
| $157K | ﹤0.01% |
2,700
-1,500
| -36% | -$102K |
|
4583
CALL
Sinclair Inc
SBGI
$1.02B
| $157K | ﹤0.01% |
9,900
+4,500
| +83% | +$68.1K |
|
4584
CALL
SFL Corp
SFL
$1.61B
| $157K | ﹤0.01% |
19,200
+1,700
| +10% | +$16.4K |
|
4585
Aemetis
AMTX
$99.2M
| $156K | ﹤0.01% |
89,830
+32,207
| +56% | +$68.8K |
|
|
ARI
4586
CALL
Apollo Commercial Real Estate
ARI
$864M
| $156K | ﹤0.01% |
16,400
+2,300
| +16% | +$21.8K |
|
4587
Everest Group
EG
$15.6B
| $156K | ﹤0.01% |
+430
| New | +$152K |
|
4588
PUT
American Century Diversified Corporate Bond ETF
KORP
$869M
| $156K | ﹤0.01% |
2,400
-900
| -27% | -$41.7K |
|
4589
Nano X Imaging
NNOX
$61.1M
| $156K | ﹤0.01% |
+31,321
| New | +$217K |
|
4590
PUT
Spire Global
SPIR
$408M
| $156K | ﹤0.01% |
19,400
+10,100
| +109% | +$134K |
|
4591
CALL
Xometry
XMTR
$4.47B
| $156K | ﹤0.01% |
6,300
-6,700
| -52% | -$210K |
|
|
FFAI
4592
Faraday Future Intelligent Electric
FFAI
$11.8M
| $156K | ﹤0.01% |
926
-889
| -49% | -$200K |
|
4593
PUT
Amneal Pharmaceuticals
AMRX
$6.1B
| $155K | ﹤0.01% |
18,600
+16,900
| +994% | +$141K |
|
4594
Editas Medicine
EDIT
$399M
| $155K | ﹤0.01% |
134,167
+95,525
| +247% | +$141K |
|
4595
CALL
Evolus
EOLS
$397M
| $155K | ﹤0.01% |
12,900
-7,600
| -37% | -$99.4K |
|
4596
PUT
Eagle Materials
EXP
$6.49B
| $155K | ﹤0.01% |
700
+400
| +133% | +$94.8K |
|
4597
PUT
GATX Corp
GATX
$6.45B
| $155K | ﹤0.01% |
+1,000
| New | +$159K |
|
4598
PUT
STAG Industrial
STAG
$7.5B
| $155K | ﹤0.01% |
4,300
+1,200
| +39% | +$41.9K |
|
4599
CALL
Thomson Reuters
TRI
$46.4B
| $155K | ﹤0.01% |
886
-10,141
| -92% | -$1.75M |
|
4600
PUT
Vanguard Dividend Appreciation ETF
VIG
$111B
| $155K | ﹤0.01% |
800
-5,200
| -87% | -$1.03M |
|
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.