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 |
Microsoft
MSFT
|
+$234M |
| 2 |
iShares Russell 2000 ETF
IWM
|
+$97.5M |
| 3 |
Amazon
AMZN
|
+$96.8M |
| 4 |
iShares Bitcoin Trust
IBIT
|
+$80.6M |
| 5 |
Pinduoduo
PDD
|
+$54.9M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$129M |
| 2 |
Alphabet (Google) Class A
GOOGL
|
+$92.9M |
| 3 |
Broadcom
AVGO
|
+$82.9M |
| 4 |
Alphabet (Google) Class C
GOOG
|
+$68.4M |
| 5 |
Meta Platforms (Facebook)
META
|
+$59.2M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.79% |
| 2 | Consumer Discretionary | 0.3% |
| 3 | Healthcare | 0.25% |
| 4 | Financials | 0.17% |
| 5 | Industrials | 0.09% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
|
PENG
2576
CALL
Penguin Solutions Inc
PENG
$2.76B
| $1.56M | ﹤0.01% |
59,300
-52,400
| -47% | -$1.28M |
|
|
FIGR
2577
Figure Technology Solutions
FIGR
$6.1B
| $1.56M | ﹤0.01% |
+42,820
| New | +$1.66M |
|
2578
PUT
dLocal
DLO
$4.26B
| $1.56M | ﹤0.01% |
109,000
+56,700
| +108% | +$721K |
|
2579
Comstock Resources
CRK
$3.97B
| $1.55M | ﹤0.01% |
+78,406
| New | +$1.45M |
|
2580
PUT
Huntington Ingalls Industries
HII
$11.3B
| $1.55M | ﹤0.01% |
5,400
+3,500
| +184% | +$933K |
|
2581
CALL
Workiva
WK
$2.94B
| $1.55M | ﹤0.01% |
18,000
+17,600
| +4,400% | +$1.32M |
|
2582
CALL
Corebridge Financial
CRBG
$14.1B
| $1.55M | ﹤0.01% |
48,300
-9,600
| -17% | -$328K |
|
2583
CALL
Huntsman Corp
HUN
$2.24B
| $1.54M | ﹤0.01% |
172,100
+54,700
| +47% | +$575K |
|
2584
CALL
American Financial Group
AFG
$11.9B
| $1.54M | ﹤0.01% |
10,600
+8,800
| +489% | +$1.17M |
|
|
APPX
2585
PUT
Tradr 2X Long APP Daily ETF
APPX
$57M
| $1.54M | ﹤0.01% |
21,900
+14,300
| +188% | +$956K |
|
2586
PUT
Aflac
AFL
$63.9B
| $1.54M | ﹤0.01% |
13,800
-400
| -3% | -$42K |
|
2587
Upexi
UPXI
$58.8M
| $1.54M | ﹤0.01% |
267,135
+210,603
| +373% | +$1.28M |
|
2588
Xcel Energy
XEL
$51B
| $1.54M | ﹤0.01% |
+19,059
| New | +$1.38M |
|
2589
PUT
Interparfums
IPAR
$3.92B
| $1.53M | ﹤0.01% |
15,600
-3,000
| -16% | -$353K |
|
2590
PUT
Amplify Energy
AMPY
$163M
| $1.53M | ﹤0.01% |
292,000
+166,900
| +133% | +$657K |
|
2591
SBA Communications
SBAC
$18.4B
| $1.53M | ﹤0.01% |
+7,930
| New | +$1.72M |
|
2592
PUT
Public Storage
PSA
$60.2B
| $1.53M | ﹤0.01% |
5,300
+2,600
| +96% | +$746K |
|
2593
Netflix
NFLX
$292B
| $1.53M | ﹤0.01% |
12,750
+20
| +0.2% | +$2.44K |
|
2594
Axsome Therapeutics
AXSM
$12.4B
| $1.53M | ﹤0.01% |
12,576
-743
| -6% | -$83.7K |
|
2595
PUT
Cooper-Standard Automotive
CPS
$504M
| $1.52M | ﹤0.01% |
41,300
+32,500
| +369% | +$991K |
|
2596
CALL
ImmunityBio
IBRX
$7.44B
| $1.52M | ﹤0.01% |
620,300
+110,100
| +22% | +$284K |
|
2597
PUT
UWM Holdings
UWMC
$621M
| $1.52M | ﹤0.01% |
250,500
+189,800
| +313% | +$995K |
|
|
2598
dLocal
DLO
$4.26B
| $1.52M | ﹤0.01% |
106,726
+48,701
| +84% | +$619K |
|
2599
PUT
Sinclair Inc
SBGI
$974M
| $1.52M | ﹤0.01% |
100,900
+12,000
| +13% | +$172K |
|
2600
PUT
Patterson-UTI
PTEN
$3.87B
| $1.52M | ﹤0.01% |
293,600
+104,600
| +55% | +$601K |
|
Similar funds
Simplex Trading's Q3 2025 Portfolio in Review
As of Q3 2025, Simplex Trading held 10,358 positions worth $195B, up 12% from $175B the previous quarter. Its ten largest holdings account for 46% of the portfolio.
Simplex Trading's Q3 2025 filing shows 1,743 new, 3,828 increased, 3,250 reduced and 1,308 closed positions. Its largest new stake was Microsoft: 458,309 shares worth $237M. The largest sale was iShares 20+ Year Treasury Bond ETF, an estimated $129M.
By sector, the portfolio is most concentrated in Technology at 0.79% of assets, up from 0.74% a quarter earlier, followed by Consumer Discretionary and Healthcare.
- Simplex Trading's largest Q3 2025 buy was Microsoft: 458,309 shares worth $237M.
- Simplex Trading added most to iShares Russell 2000 ETF in Q3 2025, an estimated $97.5M increase.
- Simplex Trading's biggest Q3 2025 reduction was Alphabet (Google) Class A, cutting an estimated $92.9M.
- Simplex Trading fully exited iShares 20+ Year Treasury Bond ETF in Q3 2025, selling an estimated $129M.
- Simplex Trading's ten largest holdings make up 46% of its $195B portfolio in Q3 2025.
- Simplex Trading opened 1,743 new positions and closed 1,308 in Q3 2025.
- Simplex Trading's portfolio value rose 12% quarter-over-quarter to $195B.
Based on Simplex Trading's 13F filing for Q3 2025, filed 12 Nov 2025.