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 | |
|---|---|---|---|---|---|---|
6451
Century Communities
CCS
$1.98B
| $23K | ﹤0.01% |
+345
| New | +$25K |
|
6452
CALL
Caledonia Mining Corp
CMCL
$351M
| $23K | ﹤0.01% |
1,900
+1,700
| +850% | +$17.5K |
|
6453
CALL
Ceragon Networks
CRNT
$188M
| $23K | ﹤0.01% |
9,800
-127,200
| -93% | -$467K |
|
6454
CALL
Dyne Therapeutics
DYN
$4.15B
| $23K | ﹤0.01% |
2,200
-27,100
| -92% | -$388K |
|
|
EARN
6455
Ellington Residential Mortgage REIT
EARN
$166M
| $23K | ﹤0.01% |
4,265
+3,383
| +384% | +$21.5K |
|
6456
CALL
FB Financial Corp
FBK
$2.98B
| $23K | ﹤0.01% |
+500
| New | +$25.1K |
|
|
FOLD
6457
CALL
DELISTED
Amicus Therapeutics
FOLD
| $23K | ﹤0.01% |
2,900
-3,000
| -51% | -$27.8K |
|
6458
HUTCHMED
HCM
$1.96B
| $23K | ﹤0.01% |
1,565
+1,174
| +300% | +$17.4K |
|
6459
PUT
James Hardie Industries
JHX
$15.2B
| $23K | ﹤0.01% |
+1,000
| New | +$31.5K |
|
6460
Kingstone Companies
KINS
$295M
| $23K | ﹤0.01% |
+1,392
| New | +$22.2K |
|
6461
CALL
Pulmonx
LUNG
$52.8M
| $23K | ﹤0.01% |
3,500
+3,300
| +1,650% | +$23.4K |
|
6462
CALL
Monro
MNRO
$414M
| $23K | ﹤0.01% |
1,600
-2,400
| -60% | -$45.9K |
|
6463
CALL
NovaGold Resources
NG
$2.54B
| $23K | ﹤0.01% |
8,000
-2,600
| -25% | -$8.37K |
|
6464
Nerdy
NRDY
$108M
| $23K | ﹤0.01% |
16,337
-20,656
| -56% | -$34.7K |
|
6465
CALL
Grupo Aeroportuario Centro Norte
OMAB
$5.14B
| $23K | ﹤0.01% |
+300
| New | +$23.2K |
|
|
ORC
6466
PUT
Orchid Island Capital
ORC
$1.31B
| $23K | ﹤0.01% |
3,100
-159,800
| -98% | -$1.31M |
|
|
PDS
6467
CALL
Precision Drilling
PDS
$946M
| $23K | ﹤0.01% |
500
+400
| +400% | +$21.8K |
|
6468
Palomar
PLMR
$3.79B
| $23K | ﹤0.01% |
169
-43
| -20% | -$5.09K |
|
6469
CALL
Priority Technology Holdings
PRTH
$554M
| $23K | ﹤0.01% |
+3,500
| New | +$33.1K |
|
6470
PUT
Rekor Systems
REKR
$82.6M
| $23K | ﹤0.01% |
26,100
-3,100
| -11% | -$4.89K |
|
|
RNAM
6471
PUT
DELISTED
Avidity Biosciences
RNAM
| $23K | ﹤0.01% |
800
+200
| +33% | +$6.23K |
|
6472
PUT
RPM International
RPM
$13.8B
| $23K | ﹤0.01% |
200
-300
| -60% | -$36.5K |
|
6473
PUT
Surgery Partners
SGRY
$2.15B
| $23K | ﹤0.01% |
1,000
+500
| +100% | +$11.8K |
|
|
FIRY
6474
CALL
Firy Inc
FIRY
$154M
| $23K | ﹤0.01% |
5,200
-2,700
| -34% | -$15.4K |
|
6475
CALL
Stoke Therapeutics
STOK
$1.84B
| $23K | ﹤0.01% |
3,600
+3,100
| +620% | +$28.9K |
|
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.