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 | |
|---|---|---|---|---|---|---|
6501
PUT
LENSAR
LNSR
$64.5M
| $22K | ﹤0.01% |
1,600
-26,300
| -94% | -$302K |
|
6502
Grand Canyon Education
LOPE
$4.22B
| $22K | ﹤0.01% |
+129
| New | +$22.4K |
|
6503
NET Power
NPWR
$120M
| $22K | ﹤0.01% |
8,672
-19,715
| -69% | -$139K |
|
|
OCFT
6504
DELISTED
OneConnect Financial Technology
OCFT
| $22K | ﹤0.01% |
+3,312
| New | +$14.7K |
|
6505
CALL
Pliant Therapeutics
PLRX
$65M
| $22K | ﹤0.01% |
16,500
+11,000
| +200% | +$66.8K |
|
6506
Pulse Biosciences
PLSE
$2.37B
| $22K | ﹤0.01% |
1,400
+1,086
| +346% | +$20.2K |
|
6507
Rekor Systems
REKR
$82.6M
| $22K | ﹤0.01% |
25,384
-13,215
| -34% | -$20.9K |
|
6508
RXO
RXO
$3.68B
| $22K | ﹤0.01% |
1,156
-5,778
| -83% | -$126K |
|
6509
CALL
Sonic Automotive
SAH
$3.56B
| $22K | ﹤0.01% |
400
-300
| -43% | -$20.2K |
|
6510
CALL
Sight Sciences
SGHT
$291M
| $22K | ﹤0.01% |
9,300
| – | – |
|
6511
CALL
SIGA Technologies
SIGA
$240M
| $22K | ﹤0.01% |
4,100
-31,100
| -88% | -$184K |
|
|
SKE
6512
CALL
Skeena Resources
SKE
$3.19B
| $22K | ﹤0.01% |
2,200
-3,400
| -61% | -$34.2K |
|
|
SNV
6513
DELISTED
Synovus
SNV
| $22K | ﹤0.01% |
491
-25,052
| -98% | -$1.29M |
|
6514
Sonoco
SON
$5.83B
| $22K | ﹤0.01% |
+472
| New | +$22.3K |
|
|
SOND
6515
CALL
DELISTED
Sonder
SOND
| $22K | ﹤0.01% |
11,100
-182,800
| -94% | -$517K |
|
|
STKL
6516
CALL
DELISTED
SunOpta
STKL
| $22K | ﹤0.01% |
4,700
-3,900
| -45% | -$26K |
|
6517
PUT
BlackRock TCP Capital
TCPC
$278M
| $22K | ﹤0.01% |
2,800
+1,400
| +100% | +$12.1K |
|
6518
Mammoth Energy Services
TUSK
$122M
| $22K | ﹤0.01% |
11,079
+9,774
| +749% | +$26.1K |
|
6519
PUT
Dentsply Sirona
XRAY
$2.84B
| $22K | ﹤0.01% |
1,500
-54,600
| -97% | -$967K |
|
6520
CALL
Ziff Davis
ZD
$2B
| $22K | ﹤0.01% |
+600
| New | +$28.8K |
|
|
PENG
6521
Penguin Solutions Inc
PENG
$2.24B
| $22K | ﹤0.01% |
+1,276
| New | +$25.1K |
|
6522
CALL
Amylyx Pharmaceuticals
AMLX
$2.19B
| $21K | ﹤0.01% |
6,000
-34,100
| -85% | -$121K |
|
6523
VanEck Fallen Angel High Yield Bond ETF
ANGL
$3.07B
| $21K | ﹤0.01% |
+738
| New | +$21.3K |
|
6524
CALL
BuzzFeed
BZFD
$99M
| $21K | ﹤0.01% |
9,900
-19,900
| -67% | -$47.5K |
|
6525
CALL
Cass Information Systems
CASS
$716M
| $21K | ﹤0.01% |
500
| – | – |
|
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.