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 | |
|---|---|---|---|---|---|---|
3426
CALL
Blue Owl Capital
OBDC
$5.42B
| $492K | ﹤0.01% |
33,600
+24,100
| +254% | +$362K |
|
3427
PUT
Companhia Siderúrgica Nacional
SID
$1.49B
| $491K | ﹤0.01% |
294,100
| – | – |
|
3428
PUT
Pentair
PNR
$10.2B
| $489K | ﹤0.01% |
5,600
-32,200
| -85% | -$3.07M |
|
3429
CALL
Procept Biorobotics
PRCT
$1.01B
| $489K | ﹤0.01% |
8,400
-12,900
| -61% | -$881K |
|
3430
PUT
uniQure
QURE
$2.63B
| $489K | ﹤0.01% |
46,200
-62,400
| -57% | -$875K |
|
3431
PUT
Blackstone Secured Lending
BXSL
$5.35B
| $488K | ﹤0.01% |
15,100
+1,900
| +14% | +$62.6K |
|
3432
PUT
3D Systems Corp
DDD
$430M
| $488K | ﹤0.01% |
230,600
+38,200
| +20% | +$130K |
|
3433
HealthEquity
HQY
$8.28B
| $487K | ﹤0.01% |
5,517
+1,244
| +29% | +$128K |
|
3434
PUT
KULR Technology Group
KULR
$122M
| $487K | ﹤0.01% |
46,188
+17,438
| +61% | +$272K |
|
3435
CALL
Broadridge
BR
$17.7B
| $484K | ﹤0.01% |
2,000
+400
| +25% | +$94.1K |
|
3436
HighPeak Energy
HPK
$855M
| $484K | ﹤0.01% |
38,280
+6,916
| +22% | +$92.9K |
|
3437
PUT
PVH
PVH
$3.87B
| $484K | ﹤0.01% |
7,500
-9,200
| -55% | -$743K |
|
3438
PUT
Republic Services
RSG
$66.7B
| $484K | ﹤0.01% |
2,000
-1,400
| -41% | -$314K |
|
3439
Delek US
DK
$3.95B
| $483K | ﹤0.01% |
32,076
+7,147
| +29% | +$124K |
|
3440
PUT
Invesco CurrencyShares Canadian Dollar Trust
FXC
$72.6M
| $482K | ﹤0.01% |
7,100
+5,100
| +255% | +$347K |
|
3441
CALL
Mueller Water Products
MWA
$3.94B
| $482K | ﹤0.01% |
19,000
-100
| -0.5% | -$2.51K |
|
3442
CALL
Old Republic International
ORI
$10.5B
| $482K | ﹤0.01% |
12,300
-1,000
| -8% | -$36.7K |
|
3443
PUT
Valley National Bancorp
VLY
$7.94B
| $482K | ﹤0.01% |
54,300
-608,400
| -92% | -$5.75M |
|
|
VRN
3444
PUT
DELISTED
Veren
VRN
| $482K | ﹤0.01% |
72,900
-7,600
| -9% | -$42.1K |
|
3445
CALL
Legend Biotech
LEGN
$3.73B
| $481K | ﹤0.01% |
14,200
+10,900
| +330% | +$391K |
|
3446
PUT
Robert Half
RHI
$4.07B
| $480K | ﹤0.01% |
8,800
-44,800
| -84% | -$2.73M |
|
3447
CALL
Atkore
ATKR
$2.54B
| $479K | ﹤0.01% |
8,000
-900
| -10% | -$64.3K |
|
3448
CALL
Domo
DOMO
$161M
| $479K | ﹤0.01% |
61,800
+53,900
| +682% | +$432K |
|
|
ACLX
3449
CALL
DELISTED
Arcellx
ACLX
| $478K | ﹤0.01% |
7,300
-14,000
| -66% | -$948K |
|
3450
CALL
DoubleVerify
DV
$1.68B
| $478K | ﹤0.01% |
35,800
-30,300
| -46% | -$561K |
|
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.