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 | |
|---|---|---|---|---|---|---|
3901
PUT
Digital Turbine
APPS
$1.02B
| $305K | ﹤0.01% |
112,400
+92,900
| +476% | +$302K |
|
3902
PUT
PagSeguro Digital
PAGS
$2.69B
| $305K | ﹤0.01% |
40,000
-16,400
| -29% | -$122K |
|
3903
PUT
PBF Energy
PBF
$7.22B
| $305K | ﹤0.01% |
16,000
-41,100
| -72% | -$1.02M |
|
3904
CALL
Flowers Foods
FLO
$1.6B
| $304K | ﹤0.01% |
16,000
+2,200
| +16% | +$42.1K |
|
3905
Freshworks
FRSH
$3.09B
| $304K | ﹤0.01% |
21,571
-49,170
| -70% | -$824K |
|
3906
TETRA Technologies
TTI
$1.07B
| $304K | ﹤0.01% |
+90,660
| New | +$361K |
|
|
TTAN
3907
PUT
ServiceTitan Inc
TTAN
$7.48B
| $304K | ﹤0.01% |
+3,200
| New | +$310K |
|
3908
CALL
National CineMedia
NCMI
$371M
| $303K | ﹤0.01% |
51,900
-22,100
| -30% | -$142K |
|
3909
Geron
GERN
$930M
| $302K | ﹤0.01% |
190,021
+47,439
| +33% | +$116K |
|
|
KLC
3910
KinderCare Learning Companies
KLC
$625M
| $302K | ﹤0.01% |
26,065
+24,483
| +1,548% | +$454K |
|
3911
CALL
Concrete Pumping Holdings
BBCP
$513M
| $301K | ﹤0.01% |
55,300
+54,400
| +6,044% | +$379K |
|
3912
PUT
Lufax Holding
LU
$1.33B
| $301K | ﹤0.01% |
101,500
-240,500
| -70% | -$667K |
|
3913
CALL
TransAlta
TAC
$4.03B
| $301K | ﹤0.01% |
32,200
-82,200
| -72% | -$910K |
|
3914
CALL
Veeco
VECO
$2.79B
| $301K | ﹤0.01% |
15,000
-5,000
| -25% | -$120K |
|
|
ITOS
3915
CALL
DELISTED
iTeos Therapeutics
ITOS
| $300K | ﹤0.01% |
50,400
-187,600
| -79% | -$1.38M |
|
|
LGF.B
3916
CALL
DELISTED
Lions Gate Entertainment Corp. Class B Non-Voting Shares
LGF.B
| $300K | ﹤0.01% |
33,900
-87,500
| -72% | -$701K |
|
3917
CALL
Liquidia Corp
LQDA
$7.72B
| $299K | ﹤0.01% |
20,300
-44,300
| -69% | -$646K |
|
3918
CALL
Atomera
ATOM
$187M
| $298K | ﹤0.01% |
74,700
+23,500
| +46% | +$183K |
|
3919
CALL
Gogo Inc
GOGO
$550M
| $298K | ﹤0.01% |
34,600
+3,500
| +11% | +$27.4K |
|
3920
PUT
Pegasystems
PEGA
$4.85B
| $298K | ﹤0.01% |
8,600
+8,000
| +1,333% | +$354K |
|
|
PPTA
3921
CALL
Perpetua Resources
PPTA
$2.18B
| $298K | ﹤0.01% |
27,900
+4,700
| +20% | +$50.5K |
|
3922
CALL
Teledyne Technologies
TDY
$30.1B
| $298K | ﹤0.01% |
600
| – | – |
|
3923
UWM Holdings
UWMC
$631M
| $298K | ﹤0.01% |
54,595
-74,888
| -58% | -$455K |
|
|
GRFS
3924
PUT
Grifois
GRFS
$5.44B
| $297K | ﹤0.01% |
41,900
+16,300
| +64% | +$123K |
|
3925
CALL
Philips
PHG
$25B
| $297K | ﹤0.01% |
12,648
-9,080
| -42% | -$222K |
|
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.