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 | |
|---|---|---|---|---|---|---|
1676
CALL
Innodata
INOD
$1.93B
| $2.95M | ﹤0.01% |
82,100
+16,400
| +25% | +$721K |
|
1677
CALL
Hecla Mining
HL
$13.8B
| $2.95M | ﹤0.01% |
529,900
-72,900
| -12% | -$405K |
|
1678
CALL
GlobalFoundries
GFS
$25.2B
| $2.94M | ﹤0.01% |
79,700
-91,700
| -54% | -$3.71M |
|
1679
PUT
Manchester United
MANU
$3.57B
| $2.94M | ﹤0.01% |
224,400
-60,600
| -21% | -$916K |
|
1680
CALL
Comfort Systems
FIX
$57.9B
| $2.93M | ﹤0.01% |
9,100
+6,700
| +279% | +$2.7M |
|
1681
PUT
Thor Industries
THO
$3.88B
| $2.93M | ﹤0.01% |
38,700
-19,400
| -33% | -$1.82M |
|
1682
Stellantis
STLA
$15.7B
| $2.93M | ﹤0.01% |
261,541
-166,440
| -39% | -$2.14M |
|
1683
Global X Silver Miners ETF NEW
SIL
$5.29B
| $2.93M | ﹤0.01% |
74,282
+56,464
| +317% | +$2.03M |
|
1684
Teck Resources
TECK
$35.2B
| $2.92M | ﹤0.01% |
80,305
-34,544
| -30% | -$1.43M |
|
|
RDFN
1685
PUT
DELISTED
Redfin
RDFN
| $2.92M | ﹤0.01% |
316,800
-58,000
| -15% | -$496K |
|
1686
CALL
Lincoln National
LNC
$8.46B
| $2.91M | ﹤0.01% |
81,100
-42,300
| -34% | -$1.5M |
|
1687
PUT
WillScot Mobile Mini Holdings
WSC
$3.62B
| $2.91M | ﹤0.01% |
104,700
-180,900
| -63% | -$6.15M |
|
|
MRSH
1688
CALL
Marsh
MRSH
$86.5B
| $2.9M | ﹤0.01% |
11,900
-17,400
| -59% | -$3.95M |
|
|
1689
PUT
Comfort Systems
FIX
$57.9B
| $2.9M | ﹤0.01% |
9,000
+4,000
| +80% | +$1.61M |
|
1690
PUT
Teladoc Health
TDOC
$1.15B
| $2.9M | ﹤0.01% |
364,200
+38,300
| +12% | +$387K |
|
1691
PUT
Vail Resorts
MTN
$4.77B
| $2.9M | ﹤0.01% |
18,100
-6,200
| -26% | -$1.03M |
|
1692
PUT
Toll Brothers
TOL
$12.7B
| $2.89M | ﹤0.01% |
27,400
-126,800
| -82% | -$15.2M |
|
1693
CALL
Star Bulk Carriers
SBLK
$3.49B
| $2.89M | ﹤0.01% |
185,900
+108,300
| +140% | +$1.69M |
|
|
WBS
1694
PUT
DELISTED
Webster Financial
WBS
| $2.89M | ﹤0.01% |
56,100
+54,700
| +3,907% | +$3.04M |
|
1695
J.M. Smucker
SJM
$13.2B
| $2.89M | ﹤0.01% |
+24,414
| New | +$2.64M |
|
1696
PUT
Western Alliance Bancorporation
WAL
$8.78B
| $2.89M | ﹤0.01% |
37,600
-49,700
| -57% | -$4.17M |
|
1697
CALL
Clear Secure
YOU
$4.47B
| $2.89M | ﹤0.01% |
111,500
-40,300
| -27% | -$1M |
|
1698
CALL
Viper Energy
VNOM
$16B
| $2.88M | ﹤0.01% |
63,900
+56,000
| +709% | +$2.64M |
|
|
UCD
1699
PUT
DELISTED
PROSHARES ULTRA BLOOMBERG COMMODITY
UCD
| $2.87M | ﹤0.01% |
63,900
-91,000
| -59% | -$4.09M |
|
1700
CALL
Sweetgreen
SG
$820M
| $2.87M | ﹤0.01% |
114,800
-122,700
| -52% | -$3.39M |
|
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.