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 | |
|---|---|---|---|---|---|---|
4626
QuinStreet
QNST
$890M
| $150K | ﹤0.01% |
+8,449
| New | +$177K |
|
4627
CALL
Westlake Corp
WLK
$9.19B
| $150K | ﹤0.01% |
1,500
-51,600
| -97% | -$5.71M |
|
4628
Banco Macro
BMA
$6.02B
| $149K | ﹤0.01% |
+1,980
| New | +$185K |
|
|
BORR
4629
CALL
Borr Drilling
BORR
$1.23B
| $149K | ﹤0.01% |
68,400
+44,500
| +186% | +$134K |
|
4630
PUT
Ceragon Networks
CRNT
$197M
| $149K | ﹤0.01% |
63,700
+57,200
| +880% | +$210K |
|
4631
PUT
Hilton Grand Vacations
HGV
$3.64B
| $149K | ﹤0.01% |
4,000
+3,500
| +700% | +$140K |
|
4632
Cadiz
CDZI
$264M
| $148K | ﹤0.01% |
+50,829
| New | +$223K |
|
4633
CALL
CareTrust REIT
CTRE
$9.84B
| $148K | ﹤0.01% |
+5,200
| New | +$140K |
|
4634
HCI Group
HCI
$2.32B
| $148K | ﹤0.01% |
+995
| New | +$126K |
|
4635
CALL
Healthcare Realty
HR
$7.46B
| $148K | ﹤0.01% |
8,800
+1,300
| +17% | +$21.6K |
|
4636
CALL
Huazhu Hotels Group
HTHT
$13B
| $148K | ﹤0.01% |
4,000
-10,800
| -73% | -$374K |
|
4637
CALL
Limbach Holdings
LMB
$833M
| $148K | ﹤0.01% |
2,000
-9,100
| -82% | -$795K |
|
4638
PUT
Cogent Communications
CCOI
$663M
| $147K | ﹤0.01% |
2,400
+1,000
| +71% | +$73.7K |
|
4639
CALL
Lightspeed Commerce
LSPD
$1.27B
| $147K | ﹤0.01% |
16,900
-8,200
| -33% | -$106K |
|
4640
Frontier Group Holdings
ULCC
$1.61B
| $147K | ﹤0.01% |
+33,903
| New | +$252K |
|
4641
PUT
Xperi
XPER
$364M
| $147K | ﹤0.01% |
+19,100
| New | +$167K |
|
4642
PUT
National Vision
EYE
$1.79B
| $146K | ﹤0.01% |
11,500
+11,400
| +11,400% | +$135K |
|
|
LNW
4643
DELISTED
Light & Wonder
LNW
| $146K | ﹤0.01% |
1,687
+1,210
| +254% | +$117K |
|
4644
PUT
Masco
MAS
$14.2B
| $146K | ﹤0.01% |
2,100
+400
| +24% | +$29.9K |
|
4645
PUT
NovoCure
NVCR
$1.77B
| $146K | ﹤0.01% |
8,200
-6,500
| -44% | -$148K |
|
|
OPRA
4646
PUT
Opera Ltd
OPRA
$1.67B
| $146K | ﹤0.01% |
9,200
-9,900
| -52% | -$183K |
|
|
HTT
4647
High Templar Tech Ltd
HTT
$379M
| $146K | ﹤0.01% |
54,482
+25,675
| +89% | +$72.6K |
|
|
4648
PUT
QuinStreet
QNST
$890M
| $146K | ﹤0.01% |
8,200
+8,100
| +8,100% | +$170K |
|
|
SUPV
4649
Grupo Supervielle
SUPV
$880M
| $146K | ﹤0.01% |
+11,239
| New | +$171K |
|
|
TOPT
4650
iShares Top 20 U.S. Stocks ETF
TOPT
$660M
| $146K | ﹤0.01% |
6,130
-10,381
| -63% | -$266K |
|
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.