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 | |
|---|---|---|---|---|---|---|
2426
PUT
NCR Voyix
VYX
$1.06B
| $1.33M | ﹤0.01% |
136,300
+132,200
| +3,224% | +$1.55M |
|
2427
Align Technology
ALGN
$12B
| $1.33M | ﹤0.01% |
+8,350
| New | +$1.64M |
|
2428
CALL
Encompass Health
EHC
$11.2B
| $1.33M | ﹤0.01% |
13,100
+13,000
| +13,000% | +$1.27M |
|
2429
CALL
American Coastal Insurance
ACIC
$498M
| $1.32M | ﹤0.01% |
114,400
+109,500
| +2,235% | +$1.33M |
|
2430
CALL
Vaalco Energy
EGY
$594M
| $1.32M | ﹤0.01% |
351,900
+88,200
| +33% | +$368K |
|
2431
PUT
Mid-America Apartment Communities
MAA
$15.6B
| $1.32M | ﹤0.01% |
7,900
+6,800
| +618% | +$1.08M |
|
2432
PUT
Brookfield Asset Management
BAM
$74B
| $1.32M | ﹤0.01% |
27,300
+21,200
| +348% | +$1.16M |
|
2433
Hecla Mining
HL
$10.2B
| $1.32M | ﹤0.01% |
237,861
-146,423
| -38% | -$813K |
|
2434
CALL
ACM Research
ACMR
$5.83B
| $1.32M | ﹤0.01% |
56,600
-2,100
| -4% | -$48K |
|
2435
CALL
Boot Barn
BOOT
$4.55B
| $1.32M | ﹤0.01% |
12,300
-800
| -6% | -$107K |
|
2436
CALL
JFrog
FROG
$9.71B
| $1.32M | ﹤0.01% |
41,200
+14,900
| +57% | +$519K |
|
2437
Floor & Decor
FND
$5.81B
| $1.31M | ﹤0.01% |
+16,353
| New | +$1.54M |
|
2438
PUT
Service Corp International
SCI
$11.4B
| $1.31M | ﹤0.01% |
16,400
-7,100
| -30% | -$559K |
|
|
VTLE
2439
PUT
DELISTED
Vital Energy
VTLE
| $1.31M | ﹤0.01% |
62,000
-37,200
| -38% | -$1.08M |
|
2440
CALL
Bitwise Bitcoin ETF
BITB
$2.46B
| $1.31M | ﹤0.01% |
29,300
+5,800
| +25% | +$294K |
|
|
NVMI
2441
Nova
NVMI
$13.9B
| $1.31M | ﹤0.01% |
7,129
+5,105
| +252% | +$1.18M |
|
2442
CALL
CorMedix
CRMD
$617M
| $1.31M | ﹤0.01% |
213,300
+138,400
| +185% | +$1.43M |
|
|
SII
2443
Sprott
SII
$2.65B
| $1.31M | ﹤0.01% |
29,228
+16,795
| +135% | +$724K |
|
2444
CALL
AllianceBernstein
AB
$3.47B
| $1.31M | ﹤0.01% |
34,200
+14,500
| +74% | +$546K |
|
2445
Rush Street Interactive
RSI
$3.24B
| $1.31M | ﹤0.01% |
+122,208
| New | +$1.61M |
|
2446
CALL
Pilgrim's Pride
PPC
$6.82B
| $1.31M | ﹤0.01% |
24,000
-24,700
| -51% | -$1.24M |
|
2447
Braze
BRZE
$2.45B
| $1.3M | ﹤0.01% |
36,054
+25,643
| +246% | +$1.03M |
|
2448
CALL
Clean Harbors
CLH
$16.1B
| $1.3M | ﹤0.01% |
6,600
-7,600
| -54% | -$1.66M |
|
2449
PUT
Star Bulk Carriers
SBLK
$3.14B
| $1.3M | ﹤0.01% |
83,500
+21,400
| +34% | +$334K |
|
|
JAMF
2450
CALL
DELISTED
Jamf
JAMF
| $1.3M | ﹤0.01% |
106,700
+105,900
| +13,238% | +$1.52M |
|
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.