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 | |
|---|---|---|---|---|---|---|
5451
PUT
Loar Holdings
LOAR
$6.41B
| $70K | ﹤0.01% |
1,000
-400
| -29% | -$28.9K |
|
5452
PUT
Arbutus Biopharma
ABUS
$857M
| $69K | ﹤0.01% |
19,900
-13,100
| -40% | -$43.7K |
|
5453
PUT
Arcosa
ACA
$7.13B
| $69K | ﹤0.01% |
900
| – | – |
|
5454
CALL
Algonquin Power & Utilities
AQN
$4.49B
| $69K | ﹤0.01% |
13,500
-1,000
| -7% | -$4.72K |
|
5455
CALL
Cabaletta Bio
CABA
$437M
| $69K | ﹤0.01% |
50,000
-46,800
| -48% | -$99.7K |
|
5456
CALL
CuriosityStream
CURI
$145M
| $69K | ﹤0.01% |
26,000
+15,600
| +150% | +$37.9K |
|
5457
Flywire
FLYW
$1.98B
| $69K | ﹤0.01% |
+7,326
| New | +$115K |
|
5458
PUT
Icon
ICLR
$12.6B
| $69K | ﹤0.01% |
400
| – | – |
|
|
JBGS
5459
PUT
JBG SMITH
JBGS
$818M
| $69K | ﹤0.01% |
4,300
+4,200
| +4,200% | +$63.9K |
|
5460
CALL
Old National Bancorp
ONB
$10.2B
| $69K | ﹤0.01% |
3,300
+2,100
| +175% | +$47.3K |
|
5461
PUT
Playboy Inc
PLBY
$128M
| $69K | ﹤0.01% |
63,500
+8,700
| +16% | +$13.6K |
|
5462
CALL
Post Holdings
POST
$4.14B
| $69K | ﹤0.01% |
600
-1,600
| -73% | -$178K |
|
5463
PROG Holdings
PRG
$1.75B
| $69K | ﹤0.01% |
2,620
+2,388
| +1,029% | +$84.4K |
|
5464
PUT
Repay Holdings
RPAY
$331M
| $69K | ﹤0.01% |
+12,500
| New | +$86K |
|
|
SJT
5465
CALL
San Juan Basin Royalty Trust
SJT
$117M
| $69K | ﹤0.01% |
12,600
+11,100
| +740% | +$52.3K |
|
5466
Spire Global
SPIR
$444M
| $69K | ﹤0.01% |
8,572
-4,156
| -33% | -$55K |
|
5467
PUT
Sasol
SSL
$7.5B
| $69K | ﹤0.01% |
16,400
| – | – |
|
5468
CALL
Takeda Pharmaceutical
TAK
$54.6B
| $69K | ﹤0.01% |
4,700
+800
| +21% | +$11.2K |
|
5469
PUT
Vulcan Materials
VMC
$34.8B
| $69K | ﹤0.01% |
300
+100
| +50% | +$25.4K |
|
|
SMCX
5470
Defiance Daily Target 2X Long SMCI ETF
SMCX
$154M
| $69K | ﹤0.01% |
1,081
-5,052
| -82% | -$517K |
|
5471
Badger Meter
BMI
$3.89B
| $68K | ﹤0.01% |
+361
| New | +$75.3K |
|
5472
PUT
Monte Rosa Therapeutics
GLUE
$1.4B
| $68K | ﹤0.01% |
14,800
+12,700
| +605% | +$77.9K |
|
|
GOOS
5473
PUT
Canada Goose Holdings
GOOS
$872M
| $68K | ﹤0.01% |
8,600
-12,200
| -59% | -$120K |
|
5474
PUT
Humacyte
HUMA
$176M
| $68K | ﹤0.01% |
40,200
-303,500
| -88% | -$1.14M |
|
5475
PUT
Liberty Energy
LBRT
$3.05B
| $68K | ﹤0.01% |
4,300
-23,600
| -85% | -$424K |
|
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.