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 | |
|---|---|---|---|---|---|---|
2576
PUT
Charles River Laboratories
CRL
$10.9B
| $1.14M | ﹤0.01% |
7,600
-3,400
| -31% | -$570K |
|
2577
Starwood Property Trust
STWD
$6.12B
| $1.14M | ﹤0.01% |
+57,849
| New | +$1.14M |
|
2578
PUT
Tradeweb Markets
TW
$21.3B
| $1.14M | ﹤0.01% |
7,700
+4,200
| +120% | +$558K |
|
|
DM
2579
PUT
DELISTED
Desktop Metal, Inc.
DM
| $1.14M | ﹤0.01% |
232,900
+16,500
| +8% | +$42.7K |
|
2580
CALL
abrdn Physical Silver Shares ETF
SIVR
$4.04B
| $1.14M | ﹤0.01% |
35,100
+6,100
| +21% | +$186K |
|
2581
PUT
Blue Bird Corp
BLBD
$2.41B
| $1.14M | ﹤0.01% |
35,200
+25,800
| +274% | +$944K |
|
2582
TechnipFMC
FTI
$30.6B
| $1.14M | ﹤0.01% |
+35,959
| New | +$1.08M |
|
2583
PUT
Evercore
EVR
$13.1B
| $1.14M | ﹤0.01% |
+5,700
| New | +$1.42M |
|
2584
The Mosaic Company
MOS
$7.09B
| $1.14M | ﹤0.01% |
42,133
-64,919
| -61% | -$1.72M |
|
2585
CALL
Camtek
CAMT
$6.9B
| $1.14M | ﹤0.01% |
19,400
-5,900
| -23% | -$475K |
|
2586
Main Street Capital
MAIN
$4.97B
| $1.14M | ﹤0.01% |
+20,114
| New | +$1.2M |
|
2587
CALL
Norfolk Southern
NSC
$78.8B
| $1.14M | ﹤0.01% |
4,800
-42,300
| -90% | -$10.3M |
|
2588
CALL
MGP Ingredients
MGPI
$378M
| $1.13M | ﹤0.01% |
38,500
+37,500
| +3,750% | +$1.25M |
|
2589
CALL
Roivant Sciences
ROIV
$25.2B
| $1.13M | ﹤0.01% |
111,900
-8,100
| -7% | -$87.6K |
|
2590
PUT
Newell Brands
NWL
$2.16B
| $1.13M | ﹤0.01% |
182,000
-27,500
| -13% | -$221K |
|
2591
PUT
Herc Holdings
HRI
$5.43B
| $1.13M | ﹤0.01% |
+8,400
| New | +$1.43M |
|
2592
PUT
Skywest
SKYW
$4.11B
| $1.13M | ﹤0.01% |
12,900
+8,700
| +207% | +$890K |
|
2593
PUT
Invesco DB US Dollar Index Bullish Fund
UUP
$434M
| $1.13M | ﹤0.01% |
41,300
+31,900
| +339% | +$927K |
|
2594
CALL
Everest Group
EG
$15.2B
| $1.13M | ﹤0.01% |
3,100
+2,700
| +675% | +$954K |
|
2595
CALL
Tenaris
TS
$29.1B
| $1.13M | ﹤0.01% |
28,800
+25,400
| +747% | +$975K |
|
2596
PUT
ADMA Biologics
ADMA
$1.92B
| $1.12M | ﹤0.01% |
56,700
+26,900
| +90% | +$465K |
|
2597
CALL
Grindr
GRND
$2.64B
| $1.12M | ﹤0.01% |
62,700
+42,000
| +203% | +$737K |
|
2598
PUT
Herbalife
HLF
$1.23B
| $1.12M | ﹤0.01% |
130,000
-263,800
| -67% | -$1.88M |
|
2599
CALL
Delek Logistics
DKL
$3.04B
| $1.12M | ﹤0.01% |
25,900
+5,000
| +24% | +$213K |
|
2600
Semtech
SMTC
$11.7B
| $1.12M | ﹤0.01% |
32,544
+13,414
| +70% | +$662K |
|
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.