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 | |
|---|---|---|---|---|---|---|
6276
Solid Power
SLDP
$450M
| $29K | ﹤0.01% |
28,277
-152,005
| -84% | -$208K |
|
6277
BlackRock TCP Capital
TCPC
$278M
| $29K | ﹤0.01% |
3,733
+49
| +1% | +$425 |
|
6278
CALL
Transportadora de Gas del Sur
TGS
$4.48B
| $29K | ﹤0.01% |
1,100
+400
| +57% | +$11.1K |
|
|
VMEO
6279
DELISTED
Vimeo
VMEO
| $29K | ﹤0.01% |
5,634
-7,042
| -56% | -$42.7K |
|
6280
PUT
AbCellera Biologics
ABCL
$1.65B
| $28K | ﹤0.01% |
12,900
+7,200
| +126% | +$20.6K |
|
|
ARIS
6281
PUT
DELISTED
Aris Water Solutions
ARIS
| $28K | ﹤0.01% |
+900
| New | +$25.5K |
|
6282
PUT
Babcock & Wilcox
BW
$1.18B
| $28K | ﹤0.01% |
42,800
-80,500
| -65% | -$99.5K |
|
6283
Certara
CERT
$1.26B
| $28K | ﹤0.01% |
2,911
-3,977
| -58% | -$48.3K |
|
|
CRGX
6284
PUT
DELISTED
CARGO Therapeutics
CRGX
| $28K | ﹤0.01% |
+7,000
| New | +$46.9K |
|
6285
Cousins Properties
CUZ
$5.31B
| $28K | ﹤0.01% |
961
-84
| -8% | -$2.51K |
|
6286
PUT
Dakota Gold
DC
$617M
| $28K | ﹤0.01% |
+10,600
| New | +$29.1K |
|
6287
CALL
Dimensional US Core Equity Market ETF
DFAU
$12.1B
| $28K | ﹤0.01% |
700
+200
| +40% | +$8.11K |
|
6288
CALL
1stdibs.com
DIBS
$148M
| $28K | ﹤0.01% |
+9,300
| New | +$33.4K |
|
6289
CALL
iPath Bloomberg Commodity Index Total Return ETN due 12 June 2036
DJP
$801M
| $28K | ﹤0.01% |
800
| – | – |
|
6290
ProShares UltraShort Dow 30
DXD
$43.6M
| $28K | ﹤0.01% |
1,039
+816
| +366% | +$21.5K |
|
6291
Embecta
EMBC
$218M
| $28K | ﹤0.01% |
2,203
+2,025
| +1,138% | +$32.4K |
|
6292
PUT
Gray Television
GTN
$437M
| $28K | ﹤0.01% |
6,500
-1,200
| -16% | -$4.72K |
|
6293
Hain Celestial
HAIN
$44.6M
| $28K | ﹤0.01% |
6,983
+5,544
| +385% | +$24.8K |
|
|
MGIC
6294
CALL
DELISTED
Magic Software Enterprises
MGIC
| $28K | ﹤0.01% |
2,200
+2,100
| +2,100% | +$26.9K |
|
6295
Mitek Systems
MITK
$756M
| $28K | ﹤0.01% |
+3,477
| New | +$33.8K |
|
6296
Direxion Daily NVDA Bull 2X ETF
NVDU
$495M
| $28K | ﹤0.01% |
539
-2,188
| -80% | -$170K |
|
|
ACH
6297
Accendra Health
ACH
$254M
| $28K | ﹤0.01% |
3,187
+2,200
| +223% | +$23.2K |
|
6298
PUT
Pembina Pipeline
PBA
$29.3B
| $28K | ﹤0.01% |
700
+300
| +75% | +$11.3K |
|
6299
PUT
Primerica
PRI
$10.1B
| $28K | ﹤0.01% |
+100
| New | +$28.5K |
|
6300
PUT
Protolabs
PRLB
$1.7B
| $28K | ﹤0.01% |
800
| – | – |
|
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.