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 | |
|---|---|---|---|---|---|---|
2476
CALL
HDFC Bank
HDB
$119B
| $1.25M | ﹤0.01% |
37,800
-17,000
| -31% | -$518K |
|
2477
CALL
EnerSys
ENS
$6.95B
| $1.25M | ﹤0.01% |
+13,700
| New | +$1.34M |
|
2478
Protagonist Therapeutics
PTGX
$8.75B
| $1.25M | ﹤0.01% |
25,934
+20,447
| +373% | +$857K |
|
2479
Clear Secure
YOU
$5.26B
| $1.25M | ﹤0.01% |
+48,416
| New | +$1.2M |
|
2480
CALL
Northern Trust
NTRS
$22.2B
| $1.25M | ﹤0.01% |
12,700
-2,900
| -19% | -$308K |
|
2481
CALL
GFL Environmental
GFL
$14.3B
| $1.25M | ﹤0.01% |
25,900
+20,200
| +354% | +$916K |
|
2482
CALL
Molina Healthcare
MOH
$10.3B
| $1.25M | ﹤0.01% |
3,800
+900
| +31% | +$272K |
|
2483
Trade Desk
TTD
$8.13B
| $1.25M | ﹤0.01% |
+22,872
| New | +$2.07M |
|
2484
PUT
CRH
CRH
$66.7B
| $1.25M | ﹤0.01% |
14,200
-5,200
| -27% | -$511K |
|
2485
PUT
Copa Holdings
CPA
$5.56B
| $1.25M | ﹤0.01% |
13,500
-6,800
| -33% | -$631K |
|
|
SPR
2486
PUT
DELISTED
Spirit AeroSystems
SPR
| $1.25M | ﹤0.01% |
36,200
-107,100
| -75% | -$3.66M |
|
|
PPL
2487
PUT
PPL Corp
PPL
$27.3B
| $1.25M | ﹤0.01% |
34,500
-129,300
| -79% | -$4.38M |
|
2488
CALL
American Superconductor
AMSC
$1.48B
| $1.24M | ﹤0.01% |
68,600
-34,200
| -33% | -$853K |
|
2489
CALL
DTE Energy
DTE
$31.1B
| $1.24M | ﹤0.01% |
9,000
+8,700
| +2,900% | +$1.11M |
|
2490
CALL
Tandem Diabetes Care
TNDM
$1.17B
| $1.24M | ﹤0.01% |
64,900
+48,300
| +291% | +$1.41M |
|
2491
Genmab
GMAB
$17.7B
| $1.24M | ﹤0.01% |
+63,476
| New | +$1.33M |
|
|
NNDM
2492
Nano Dimension
NNDM
$309M
| $1.24M | ﹤0.01% |
781,578
+300,223
| +62% | +$680K |
|
2493
ProShares UltraPro Short S&P 500
SPXU
$436M
| $1.24M | ﹤0.01% |
12,171
+9,394
| +338% | +$847K |
|
2494
CALL
Travel + Leisure Co
TNL
$4.54B
| $1.24M | ﹤0.01% |
26,800
+12,700
| +90% | +$666K |
|
2495
PUT
Winnebago Industries
WGO
$870M
| $1.24M | ﹤0.01% |
36,000
+4,000
| +13% | +$170K |
|
|
VG
2496
PUT
Venture Global Inc
VG
$35.6B
| $1.24M | ﹤0.01% |
+120,100
| New | +$1.75M |
|
2497
CALL
Republic Services
RSG
$66.7B
| $1.24M | ﹤0.01% |
5,100
+200
| +4% | +$44.8K |
|
2498
PUT
Alcon
ALC
$33.1B
| $1.23M | ﹤0.01% |
13,000
+8,100
| +165% | +$727K |
|
2499
PUT
Nano X Imaging
NNOX
$62.4M
| $1.23M | ﹤0.01% |
246,900
-11,400
| -4% | -$78.9K |
|
2500
PUT
Jack in the Box
JACK
$278M
| $1.23M | ﹤0.01% |
45,300
-23,300
| -34% | -$857K |
|
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.