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 | |
|---|---|---|---|---|---|---|
1426
CALL
Invitation Homes
INVH
$16.9B
| $4.16M | ﹤0.01% |
119,500
+109,500
| +1,095% | +$3.54M |
|
1427
PUT
Wendy's
WEN
$1.53B
| $4.16M | ﹤0.01% |
284,500
+258,500
| +994% | +$3.89M |
|
1428
PUT
Globalstar
GSAT
$10.7B
| $4.16M | ﹤0.01% |
199,400
+166,073
| +498% | +$4.02M |
|
1429
CALL
Albemarle
ALB
$14.9B
| $4.16M | ﹤0.01% |
57,700
-113,500
| -66% | -$9.24M |
|
1430
CALL
XPO
XPO
$22.6B
| $4.15M | ﹤0.01% |
38,600
-28,100
| -42% | -$3.57M |
|
1431
CALL
Boston Properties
BXP
$10.8B
| $4.14M | ﹤0.01% |
61,600
-17,000
| -22% | -$1.19M |
|
1432
PUT
CME Group
CME
$101B
| $4.14M | ﹤0.01% |
15,600
-30,700
| -66% | -$7.57M |
|
1433
Robinhood
HOOD
$110B
| $4.13M | ﹤0.01% |
+99,373
| New | +$4.72M |
|
1434
CALL
Noble Corp
NE
$7.28B
| $4.12M | ﹤0.01% |
173,900
+8,400
| +5% | +$240K |
|
1435
CALL
Invesco CurrencyShares Japanese Yen Trust
FXY
$446M
| $4.12M | ﹤0.01% |
67,000
-72,200
| -52% | -$4.38M |
|
1436
YPF Sociedad Anonima ADS
YPF
$20.6B
| $4.11M | ﹤0.01% |
+117,324
| New | +$4.49M |
|
1437
Global X Uranium ETF
URA
$6.45B
| $4.1M | ﹤0.01% |
179,071
+89,562
| +100% | +$2.38M |
|
1438
CALL
SSR Mining
SSRM
$7.58B
| $4.09M | ﹤0.01% |
407,800
+157,600
| +63% | +$1.45M |
|
1439
CALL
Monster Beverage
MNST
$85.8B
| $4.07M | ﹤0.01% |
139,000
-299,400
| -68% | -$7.8M |
|
1440
PUT
Wolfspeed
WOLF
$1.47B
| $4.07M | ﹤0.01% |
1,328,600
+282,000
| +27% | +$1.65M |
|
1441
PUT
Copart
CPRT
$31.2B
| $4.06M | ﹤0.01% |
71,800
+24,500
| +52% | +$1.38M |
|
|
1442
CALL
YPF Sociedad Anonima ADS
YPF
$20.6B
| $4.05M | ﹤0.01% |
115,700
-366,100
| -76% | -$14M |
|
1443
NRG Energy
NRG
$25B
| $4.04M | ﹤0.01% |
42,380
+4,229
| +11% | +$428K |
|
1444
PUT
Full Truck Alliance
YMM
$8.97B
| $4.04M | ﹤0.01% |
316,000
+289,400
| +1,088% | +$3.49M |
|
1445
CALL
Transmedics
TMDX
$3.12B
| $4.03M | ﹤0.01% |
59,900
+18,500
| +45% | +$1.27M |
|
1446
CALL
Labcorp
LH
$26.5B
| $4.03M | ﹤0.01% |
17,300
+9,200
| +114% | +$2.23M |
|
|
MRSH
1447
PUT
Marsh
MRSH
$88.6B
| $4.03M | ﹤0.01% |
16,500
+2,100
| +15% | +$476K |
|
|
JOYY
1448
CALL
JOYY Inc
JOYY
$3.67B
| $4.02M | ﹤0.01% |
95,700
+88,400
| +1,211% | +$3.98M |
|
|
1449
PUT
Boston Properties
BXP
$10.8B
| $4.01M | ﹤0.01% |
59,700
-53,000
| -47% | -$3.72M |
|
1450
State Street Health Care Select Sector SPDR ETF
XLV
$44.6B
| $4.01M | ﹤0.01% |
+27,450
| New | +$3.99M |
|
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.