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 | |
|---|---|---|---|---|---|---|
1701
CALL
Canadian Pacific Kansas City
CP
$82B
| $2.87M | ﹤0.01% |
40,900
-23,000
| -36% | -$1.75M |
|
1702
PUT
Plains All American Pipeline
PAA
$17.4B
| $2.87M | ﹤0.01% |
143,500
+19,800
| +16% | +$391K |
|
|
1703
Uber
UBER
$134B
| $2.87M | ﹤0.01% |
39,322
-573,536
| -94% | -$41.3M |
|
1704
PUT
Entegris
ENTG
$19.7B
| $2.86M | ﹤0.01% |
32,700
-5,800
| -15% | -$585K |
|
1705
PUT
Parsons
PSN
$6.28B
| $2.86M | ﹤0.01% |
48,300
+22,300
| +86% | +$1.61M |
|
1706
CALL
Parker-Hannifin
PH
$125B
| $2.86M | ﹤0.01% |
4,700
+2,500
| +114% | +$1.63M |
|
1707
CALL
Weibo
WB
$1.9B
| $2.86M | ﹤0.01% |
301,600
-210,800
| -41% | -$2.14M |
|
1708
CALL
Clover Health Investments
CLOV
$2.28B
| $2.85M | ﹤0.01% |
794,600
-76,600
| -9% | -$308K |
|
1709
Las Vegas Sands
LVS
$30.5B
| $2.85M | ﹤0.01% |
73,740
-136,696
| -65% | -$6.04M |
|
1710
Cenovus Energy
CVE
$54.6B
| $2.85M | ﹤0.01% |
204,709
-17,344
| -8% | -$250K |
|
1711
CALL
Magnite
MGNI
$2.65B
| $2.84M | ﹤0.01% |
249,100
-149,600
| -38% | -$2.39M |
|
1712
PUT
Main Street Capital
MAIN
$4.97B
| $2.84M | ﹤0.01% |
50,200
+46,600
| +1,294% | +$2.77M |
|
1713
PUT
Corebridge Financial
CRBG
$14.1B
| $2.84M | ﹤0.01% |
89,900
-55,900
| -38% | -$1.81M |
|
1714
PUT
Bitdeer Technologies
BTDR
$2.81B
| $2.84M | ﹤0.01% |
321,400
+182,500
| +131% | +$2.73M |
|
1715
PUT
Symbotic
SYM
$5.11B
| $2.83M | ﹤0.01% |
140,000
-100,800
| -42% | -$2.57M |
|
1716
PUT
Fabrinet
FN
$17.1B
| $2.82M | ﹤0.01% |
14,300
+6,800
| +91% | +$1.48M |
|
1717
CALL
Baxter International
BAX
$11.6B
| $2.82M | ﹤0.01% |
82,500
+5,100
| +7% | +$167K |
|
1718
CALL
Sterling Infrastructure
STRL
$20.3B
| $2.82M | ﹤0.01% |
24,900
+20,800
| +507% | +$2.93M |
|
1719
PUT
Host Hotels & Resorts
HST
$16.8B
| $2.81M | ﹤0.01% |
197,700
+154,100
| +353% | +$2.5M |
|
1720
PUT
SiriusXM
SIRI
$10B
| $2.81M | ﹤0.01% |
124,600
-1,249,300
| -91% | -$29.4M |
|
|
ABK
1721
CALL
DELISTED
Ambac Financial Group
ABK
| $2.81M | ﹤0.01% |
320,800
-62,600
| -16% | -$548K |
|
1722
CALL
Perrigo
PRGO
$1.4B
| $2.8M | ﹤0.01% |
99,800
+19,100
| +24% | +$495K |
|
1723
PUT
Bruker
BRKR
$9.2B
| $2.79M | ﹤0.01% |
66,900
+65,900
| +6,590% | +$3.43M |
|
1724
Wendy's
WEN
$1.33B
| $2.79M | ﹤0.01% |
190,786
+172,119
| +922% | +$2.59M |
|
1725
Caesars Entertainment
CZR
$6.1B
| $2.79M | ﹤0.01% |
111,524
+43,980
| +65% | +$1.43M |
|
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.