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 | |
|---|---|---|---|---|---|---|
7351
CALL
Prosperity Bancshares
PB
$8.73B
| $7K | ﹤0.01% |
100
-3,100
| -97% | -$235K |
|
7352
Pliant Therapeutics
PLRX
$66.9M
| $7K | ﹤0.01% |
5,303
+725
| +16% | +$4.4K |
|
|
PRA
7353
CALL
DELISTED
ProAssurance
PRA
| $7K | ﹤0.01% |
+300
| New | +$4.86K |
|
7354
CALL
PROG Holdings
PRG
$1.77B
| $7K | ﹤0.01% |
300
-1,600
| -84% | -$56.5K |
|
7355
Primoris Services
PRIM
$4.54B
| $7K | ﹤0.01% |
+136
| New | +$9.84K |
|
|
PVL
7356
PUT
Permianville Royalty Trust
PVL
$56.1M
| $7K | ﹤0.01% |
+4,500
| New | +$6.67K |
|
7357
CALL
Pyxis Oncology
PYXS
$185M
| $7K | ﹤0.01% |
7,200
-36,300
| -83% | -$48.4K |
|
7358
PUT
Quad
QUAD
$447M
| $7K | ﹤0.01% |
1,400
-1,400
| -50% | -$8.9K |
|
7359
CALL
Research Frontiers
REFR
$16.7M
| $7K | ﹤0.01% |
6,600
-300
| -4% | -$429 |
|
7360
PUT
RPC Inc
RES
$1.23B
| $7K | ﹤0.01% |
1,400
+500
| +56% | +$2.98K |
|
7361
PUT
Rackspace Technology
RXT
$983M
| $7K | ﹤0.01% |
4,700
+3,700
| +370% | +$8.81K |
|
7362
PUT
SurgePays
SURG
$6.09M
| $7K | ﹤0.01% |
+3,500
| New | +$5.17K |
|
7363
PUT
ThredUp
TDUP
$768M
| $7K | ﹤0.01% |
+3,100
| New | +$7.14K |
|
7364
PUT
TFI International
TFII
$12B
| $7K | ﹤0.01% |
100
-100
| -50% | -$11.1K |
|
7365
Tompkins Financial
TMP
$1.41B
| $7K | ﹤0.01% |
121
+36
| +42% | +$2.41K |
|
7366
PUT
TriNet
TNET
$2.97B
| $7K | ﹤0.01% |
+100
| New | +$8.3K |
|
7367
CALL
Tenaya Therapeutics
TNYA
$169M
| $7K | ﹤0.01% |
12,400
-93,500
| -88% | -$92.2K |
|
|
TPIC
7368
DELISTED
TPI Composites
TPIC
| $7K | ﹤0.01% |
9,210
+2,028
| +28% | +$2.65K |
|
7369
Unisys
UIS
$241M
| $7K | ﹤0.01% |
+1,724
| New | +$9.62K |
|
|
UROY
7370
PUT
Uranium Royalty Corp
UROY
$424M
| $7K | ﹤0.01% |
4,500
-30,600
| -87% | -$65.5K |
|
7371
USA Compression Partners
USAC
$3.74B
| $7K | ﹤0.01% |
+261
| New | +$6.92K |
|
7372
PUT
US Physical Therapy
USPH
$1.16B
| $7K | ﹤0.01% |
+100
| New | +$8.39K |
|
7373
PUT
Universal Insurance Holdings
UVE
$1.21B
| $7K | ﹤0.01% |
300
-2,900
| -91% | -$59.8K |
|
7374
Weis Markets
WMK
$1.85B
| $7K | ﹤0.01% |
+100
| New | +$7.19K |
|
|
7375
PUT
Weis Markets
WMK
$1.85B
| $7K | ﹤0.01% |
+100
| New | +$7.19K |
|
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.