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 | |
|---|---|---|---|---|---|---|
4951
PUT
Gaming and Leisure Properties
GLPI
$12.5B
| $111K | ﹤0.01% |
2,200
-4,800
| -69% | -$236K |
|
4952
Innovative Industrial Properties
IIPR
$1.72B
| $111K | ﹤0.01% |
2,055
+602
| +41% | +$41.7K |
|
4953
CALL
Lexeo Therapeutics
LXEO
$327M
| $111K | ﹤0.01% |
+32,100
| New | +$142K |
|
4954
Mercer International
MERC
$38.2M
| $111K | ﹤0.01% |
+18,057
| New | +$121K |
|
4955
CALL
Tanger
SKT
$4.7B
| $111K | ﹤0.01% |
3,300
-7,700
| -70% | -$259K |
|
4956
CALL
CareDx
CDNA
$2.2B
| $110K | ﹤0.01% |
6,200
+5,600
| +933% | +$121K |
|
4957
PUT
Genpact
G
$5.92B
| $110K | ﹤0.01% |
2,200
-3,600
| -62% | -$179K |
|
4958
CALL
Microbot Medical
MBOT
$114M
| $110K | ﹤0.01% |
+73,300
| New | +$130K |
|
4959
PUT
Medifast
MED
$107M
| $110K | ﹤0.01% |
8,200
+700
| +9% | +$10.5K |
|
4960
Q2 Holdings
QTWO
$3.73B
| $110K | ﹤0.01% |
+1,387
| New | +$122K |
|
4961
PUT
Banco Santander
SAN
$202B
| $110K | ﹤0.01% |
16,500
+15,000
| +1,000% | +$87.8K |
|
4962
Aecom
ACM
$9.26B
| $109K | ﹤0.01% |
+1,184
| New | +$120K |
|
|
BGFV
4963
CALL
DELISTED
Big 5 Sporting Goods
BGFV
| $109K | ﹤0.01% |
113,700
+27,000
| +31% | +$37K |
|
4964
CALL
Dana Inc
DAN
$2.85B
| $109K | ﹤0.01% |
8,200
-21,000
| -72% | -$302K |
|
4965
CALL
DNOW Inc
DNOW
$2.55B
| $109K | ﹤0.01% |
6,400
+5,100
| +392% | +$77.2K |
|
4966
PUT
Driven Brands
DRVN
$2.33B
| $109K | ﹤0.01% |
6,400
+6,300
| +6,300% | +$103K |
|
|
GRMN
4967
Garmin
GRMN
$56.9B
| $109K | ﹤0.01% |
+504
| New | +$109K |
|
4968
PUT
Haleon
HLN
$43.6B
| $109K | ﹤0.01% |
10,600
-29,200
| -73% | -$287K |
|
4969
CALL
Henry Schein
HSIC
$9.64B
| $109K | ﹤0.01% |
1,600
-2,400
| -60% | -$177K |
|
4970
International Flavors & Fragrances
IFF
$20.1B
| $109K | ﹤0.01% |
1,409
-9,035
| -87% | -$745K |
|
4971
CALL
Kontoor Brands
KTB
$4.61B
| $109K | ﹤0.01% |
1,700
-2,500
| -60% | -$194K |
|
4972
PUT
Mitsubishi UFJ Financial
MUFG
$254B
| $109K | ﹤0.01% |
8,000
+5,500
| +220% | +$70.8K |
|
4973
CALL
POSCO
PKX
$16.1B
| $109K | ﹤0.01% |
2,300
+2,200
| +2,200% | +$103K |
|
|
TRVG
4974
trivago
TRVG
$378M
| $109K | ﹤0.01% |
26,586
+4,712
| +22% | +$17.3K |
|
4975
CALL
Unisys
UIS
$219M
| $109K | ﹤0.01% |
23,900
+15,700
| +191% | +$87.6K |
|
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.