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 | Miscellaneous | 98.56% |
| 2 | Technology | 0.41% |
| 3 | Consumer Discretionary | 0.22% |
| 4 | Healthcare | 0.17% |
| 5 | Communication Services | 0.15% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
476
PUT
Rio Tinto
RIO
$168B
| $23.1M | 0.01% |
384,700
+94,200
| +32% | +$5.8M |
|
477
PUT
Marathon Petroleum
MPC
$109B
| $23.1M | 0.01% |
158,600
-5,100
| -3% | -$755K |
|
|
SWTX
478
CALL
DELISTED
SpringWorks Therapeutics
SWTX
| $23.1M | 0.01% |
522,900
+514,400
| +6,052% | +$23.7M |
|
479
CALL
Chewy
CHWY
$9.69B
| $23M | 0.01% |
707,800
-29,800
| -4% | -$1.07M |
|
480
CALL
D.R. Horton
DHI
$39.9B
| $22.9M | 0.01% |
180,200
+22,500
| +14% | +$3.02M |
|
481
CALL
Estee Lauder
EL
$37.6B
| $22.8M | 0.01% |
345,000
-537,800
| -61% | -$38.9M |
|
482
CALL
Wheaton Precious Metals
WPM
$70.4B
| $22.7M | 0.01% |
292,700
+8,400
| +3% | +$561K |
|
483
PUT
Enphase Energy
ENPH
$4.81B
| $22.7M | 0.01% |
366,000
-202,500
| -36% | -$12.8M |
|
484
KraneShares CSI China Internet ETF
KWEB
$5.03B
| $22.7M | 0.01% |
650,233
+647,364
| +22,564% | +$21.5M |
|
485
PUT
Edison International
EIX
$21.8B
| $22.6M | 0.01% |
383,100
+298,000
| +350% | +$17.1M |
|
486
CVS Health
CVS
$124B
| $22.5M | 0.01% |
332,331
-125,135
| -27% | -$7.49M |
|
487
CALL
Analog Devices
ADI
$176B
| $22.5M | 0.01% |
111,600
+12,900
| +13% | +$2.79M |
|
488
CALL
CME Group
CME
$101B
| $22.4M | 0.01% |
84,500
+3,200
| +4% | +$789K |
|
489
CALL
DoorDash
DASH
$91.7B
| $22.4M | 0.01% |
122,600
-200,000
| -62% | -$37.6M |
|
490
CALL
AST SpaceMobile
ASTS
$18.7B
| $22.1M | 0.01% |
972,400
-15,400
| -2% | -$394K |
|
491
PUT
Altria Group
MO
$115B
| $22.1M | 0.01% |
368,200
-179,400
| -33% | -$9.79M |
|
492
PUT
3M
MMM
$86.9B
| $22.1M | 0.01% |
228,800
-67,600
| -23% | -$9.93M |
|
493
PUT
Petrobras
PBR
$130B
| $22.1M | 0.01% |
1,539,600
+104,600
| +7% | +$1.44M |
|
494
CALL
United States Oil Fund
USO
$1.61B
| $22M | 0.01% |
284,900
+64,400
| +29% | +$4.92M |
|
495
CALL
Snap
SNAP
$9.25B
| $22M | 0.01% |
2,528,100
-1,436,400
| -36% | -$15M |
|
496
PUT
Wayfair
W
$13.6B
| $21.9M | 0.01% |
684,400
+217,300
| +47% | +$9.03M |
|
497
PUT
Yum! Brands
YUM
$41.1B
| $21.9M | 0.01% |
139,100
+52,000
| +60% | +$7.49M |
|
498
CALL
Akamai
AKAM
$15.1B
| $21.7M | 0.01% |
269,400
-126,800
| -32% | -$11.4M |
|
499
CALL
CleanSpark
CLSK
$3.26B
| $21.7M | 0.01% |
3,224,400
+413,100
| +15% | +$3.91M |
|
|
500
PUT
United States Oil Fund
USO
$1.61B
| $21.7M | 0.01% |
280,000
-539,700
| -66% | -$41.2M |
|
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's Q1 2025 filing shows 1,566 new, 3,139 increased, 3,654 reduced and 1,547 closed positions. Its largest new stake was iShares 20+ Year Treasury Bond ETF: 3,057,978 shares worth $278M. The largest sale was Apple, an estimated $518M.
By sector, the portfolio is most concentrated in Miscellaneous at 99% of assets, up from 98% a quarter earlier, followed by Technology and Consumer Discretionary.
- 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.