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 | |
|---|---|---|---|---|---|---|
4051
CALL
ARS Pharmaceuticals
SPRY
$553M
| $264K | ﹤0.01% |
21,000
+6,900
| +49% | +$83K |
|
4052
abrdn Physical Palladium Shares ETF
PALL
$602M
| $263K | ﹤0.01% |
+14,560
| New | +$256K |
|
4053
CALL
SEI Investments
SEIC
$12.5B
| $263K | ﹤0.01% |
3,400
-100
| -3% | -$8.04K |
|
|
ATSG
4054
DELISTED
Air Transport Services Group
ATSG
| $263K | ﹤0.01% |
+11,750
| New | +$261K |
|
4055
BorgWarner
BWA
$12.7B
| $262K | ﹤0.01% |
+9,153
| New | +$278K |
|
4056
PUT
BuzzFeed
BZFD
$99.9M
| $262K | ﹤0.01% |
123,400
-184,800
| -60% | -$441K |
|
4057
FNB Corp
FNB
$6.79B
| $262K | ﹤0.01% |
+19,487
| New | +$286K |
|
4058
CALL
Regal Rexnord
RRX
$12.5B
| $261K | ﹤0.01% |
2,300
+1,900
| +475% | +$264K |
|
4059
PUT
NNN REIT
NNN
$9.35B
| $260K | ﹤0.01% |
6,100
+1,700
| +39% | +$69.4K |
|
|
BLUE
4060
DELISTED
bluebird bio
BLUE
| $259K | ﹤0.01% |
+53,134
| New | +$320K |
|
4061
CALL
Prospect Capital
PSEC
$1.11B
| $259K | ﹤0.01% |
63,200
-3,700
| -6% | -$15.9K |
|
4062
CALL
PSQ Holdings
PSQH
$11.2M
| $259K | ﹤0.01% |
7,567
-1,560
| -17% | -$79.3K |
|
4063
ProShares UltraPro Dow 30
UDOW
$814M
| $259K | ﹤0.01% |
5,916
-43,548
| -88% | -$2.13M |
|
4064
PUT
UWM Holdings
UWMC
$672M
| $259K | ﹤0.01% |
47,600
-57,700
| -55% | -$350K |
|
4065
CALL
WisdomTree
WT
$2.83B
| $259K | ﹤0.01% |
29,100
-400
| -1% | -$3.73K |
|
|
TE
4066
PUT
T1 Energy
TE
$1.03B
| $259K | ﹤0.01% |
205,800
+151,200
| +277% | +$279K |
|
4067
CALL
Popular Inc
BPOP
$11.1B
| $258K | ﹤0.01% |
+2,800
| New | +$273K |
|
4068
BGC Group
BGC
$5.69B
| $257K | ﹤0.01% |
28,094
-8,882
| -24% | -$83.3K |
|
4069
PUT
CareDx
CDNA
$1.84B
| $257K | ﹤0.01% |
+14,500
| New | +$312K |
|
4070
CALL
Carter's
CRI
$1.4B
| $257K | ﹤0.01% |
+6,300
| New | +$303K |
|
|
TGR
4071
CALL
DELISTED
ISHARES TARGET DATE RETIREMENT INCOME ETF
TGR
| $257K | ﹤0.01% |
5,400
+4,400
| +440% | +$209K |
|
4072
CALL
Columbia Banking Systems
COLB
$8.77B
| $256K | ﹤0.01% |
10,300
-9,000
| -47% | -$240K |
|
4073
PUT
Bread Financial
BFH
$4.4B
| $255K | ﹤0.01% |
5,100
+4,600
| +920% | +$261K |
|
4074
National Vision
EYE
$1.74B
| $255K | ﹤0.01% |
19,956
+16,549
| +486% | +$196K |
|
4075
YieldMax TSLA Option Income Strategy ETF
TSLY
$612M
| $255K | ﹤0.01% |
6,202
+403
| +7% | +$22.5K |
|
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.