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 | |
|---|---|---|---|---|---|---|
2501
CALL
Red Rock Resorts
RRR
$3.74B
| $1.23M | ﹤0.01% |
28,400
+23,900
| +531% | +$1.13M |
|
|
QXO
2502
CALL
QXO Inc
QXO
$14.2B
| $1.23M | ﹤0.01% |
90,800
+10,300
| +13% | +$140K |
|
2503
CALL
Ambarella
AMBA
$2.99B
| $1.23M | ﹤0.01% |
24,400
-30,100
| -55% | -$2.06M |
|
|
SNDK
2504
CALL
Sandisk
SNDK
$213B
| $1.23M | ﹤0.01% |
+25,800
| New | +$1.28M |
|
2505
PUT
Invesco Mortgage Capital
IVR
$776M
| $1.23M | ﹤0.01% |
155,500
+25,700
| +20% | +$217K |
|
2506
PUT
BRC Group Holdings
RILY
$277M
| $1.23M | ﹤0.01% |
316,700
-139,100
| -31% | -$631K |
|
2507
ProShares Ultra QQQ
QLD
$12.5B
| $1.22M | ﹤0.01% |
27,546
+26,090
| +1,792% | +$1.38M |
|
2508
Futu Holdings
FUTU
$13.9B
| $1.22M | ﹤0.01% |
11,951
-40,716
| -77% | -$4.17M |
|
2509
RTX Corp
RTX
$287B
| $1.22M | ﹤0.01% |
9,240
-2,354
| -20% | -$298K |
|
2510
CALL
EPR Properties
EPR
$4.86B
| $1.22M | ﹤0.01% |
23,200
-2,000
| -8% | -$98.1K |
|
2511
CALL
MSC Industrial Direct
MSM
$7.02B
| $1.22M | ﹤0.01% |
15,700
-15,700
| -50% | -$1.26M |
|
2512
CALL
Target Hospitality
TH
$1.61B
| $1.22M | ﹤0.01% |
185,300
-280,800
| -60% | -$2.25M |
|
2513
Zimmer Biomet
ZBH
$17.7B
| $1.22M | ﹤0.01% |
10,771
+712
| +7% | +$76.2K |
|
2514
CALL
DigitalBridge
DBRG
$2.94B
| $1.22M | ﹤0.01% |
138,100
-142,300
| -51% | -$1.5M |
|
2515
CALL
Associated Banc-Corp
ASB
$5.81B
| $1.21M | ﹤0.01% |
53,900
+9,400
| +21% | +$226K |
|
|
ZK
2516
PUT
DELISTED
Zeekr
ZK
| $1.21M | ﹤0.01% |
50,400
+40,400
| +404% | +$1.07M |
|
2517
Bath & Body Works
BBWI
$4.01B
| $1.21M | ﹤0.01% |
+40,024
| New | +$1.42M |
|
2518
Kimbell Royalty Partners
KRP
$1.47B
| $1.21M | ﹤0.01% |
+86,303
| New | +$1.3M |
|
2519
CALL
ImmunityBio
IBRX
$7.44B
| $1.21M | ﹤0.01% |
401,100
-240,800
| -38% | -$730K |
|
2520
Shift4
FOUR
$3.84B
| $1.21M | ﹤0.01% |
14,761
+7,458
| +102% | +$769K |
|
2521
CALL
Galicia Financial Group
GGAL
$7.92B
| $1.2M | ﹤0.01% |
22,100
-32,200
| -59% | -$2M |
|
2522
PUT
Hallador Energy
HNRG
$718M
| $1.2M | ﹤0.01% |
97,900
+69,300
| +242% | +$778K |
|
2523
PUT
Innovative Industrial Properties
IIPR
$1.78B
| $1.2M | ﹤0.01% |
22,200
+17,800
| +405% | +$1.23M |
|
2524
PUT
Everest Group
EG
$15.2B
| $1.2M | ﹤0.01% |
3,300
+2,100
| +175% | +$742K |
|
|
AZEK
2525
CALL
DELISTED
The AZEK Co
AZEK
| $1.2M | ﹤0.01% |
24,500
-24,600
| -50% | -$1.17M |
|
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.