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 | |
|---|---|---|---|---|---|---|
4076
Ameren
AEE
$30.8B
| $254K | ﹤0.01% |
2,537
+228
| +10% | +$22K |
|
4077
TD Synnex
SNX
$20B
| $254K | ﹤0.01% |
2,451
+2,113
| +625% | +$282K |
|
4078
PUT
Coursera
COUR
$1.8B
| $253K | ﹤0.01% |
38,100
-43,400
| -53% | -$345K |
|
4079
CALL
Pediatrix Medical
MD
$2.17B
| $253K | ﹤0.01% |
17,500
+2,300
| +15% | +$32.7K |
|
4080
CALL
Protalix BioTherapeutics
PLX
$185M
| $253K | ﹤0.01% |
98,900
+89,700
| +975% | +$214K |
|
4081
Goldman Sachs Physical Gold ETF Shares
AAAU
$2.44B
| $252K | ﹤0.01% |
+8,170
| New | +$232K |
|
4082
Alignment Healthcare
ALHC
$3.82B
| $252K | ﹤0.01% |
13,577
+7,737
| +132% | +$115K |
|
4083
PUT
Microvision
MVIS
$84M
| $252K | ﹤0.01% |
203,500
+97,100
| +91% | +$135K |
|
4084
CALL
OGE Energy
OGE
$9.94B
| $252K | ﹤0.01% |
5,500
+4,400
| +400% | +$191K |
|
4085
CALL
Shoals Technologies Group
SHLS
$1.36B
| $252K | ﹤0.01% |
76,200
-117,100
| -61% | -$487K |
|
4086
CALL
Assurant
AIZ
$14B
| $251K | ﹤0.01% |
+1,200
| New | +$250K |
|
4087
CALL
Cincinnati Financial
CINF
$27.7B
| $251K | ﹤0.01% |
1,700
-4,700
| -73% | -$662K |
|
4088
SandRidge Energy
SD
$503M
| $251K | ﹤0.01% |
21,991
-20,161
| -48% | -$239K |
|
|
CHX
4089
CALL
DELISTED
ChampionX
CHX
| $250K | ﹤0.01% |
8,400
+7,700
| +1,100% | +$225K |
|
|
NAK
4090
CALL
Northern Dynasty Minerals
NAK
$773M
| $250K | ﹤0.01% |
217,700
+209,000
| +2,402% | +$152K |
|
4091
CALL
Global Net Lease
GNL
$1.87B
| $249K | ﹤0.01% |
31,000
+28,600
| +1,192% | +$215K |
|
4092
PubMatic
PUBM
$609M
| $249K | ﹤0.01% |
+27,256
| New | +$359K |
|
4093
Qfin Holdings
QFIN
$1.68B
| $249K | ﹤0.01% |
5,546
+2,383
| +75% | +$98.7K |
|
|
BCPC
4094
CALL
Balchem Corp
BCPC
$5.29B
| $249K | ﹤0.01% |
1,500
-19,300
| -93% | -$3.17M |
|
4095
BioCryst Pharmaceuticals
BCRX
$2.44B
| $248K | ﹤0.01% |
+33,149
| New | +$267K |
|
4096
PUT
CryoPort
CYRX
$748M
| $248K | ﹤0.01% |
40,800
+38,600
| +1,755% | +$267K |
|
4097
PUT
Grindr
GRND
$2.99B
| $248K | ﹤0.01% |
13,900
+13,500
| +3,375% | +$237K |
|
4098
CALL
Brookfield Asset Management
BAM
$74.7B
| $247K | ﹤0.01% |
5,100
+400
| +9% | +$21.8K |
|
4099
CALL
Integer Holdings
ITGR
$3.42B
| $247K | ﹤0.01% |
2,100
+1,800
| +600% | +$236K |
|
4100
CALL
NCR Atleos
NATL
$3.51B
| $247K | ﹤0.01% |
9,400
+8,400
| +840% | +$250K |
|
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.