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 | |
|---|---|---|---|---|---|---|
1501
InMode
INMD
$872M
| $4.77M | ﹤0.01% |
320,318
+300,331
| +1,503% | +$4.39M |
|
1502
PUT
MSCI
MSCI
$40B
| $4.77M | ﹤0.01% |
8,400
+6,800
| +425% | +$3.84M |
|
1503
CALL
Yum China
YUMC
$14.9B
| $4.76M | ﹤0.01% |
111,000
-18,700
| -14% | -$850K |
|
1504
CALL
Conagra Brands
CAG
$7.07B
| $4.76M | ﹤0.01% |
260,100
+50,500
| +24% | +$968K |
|
1505
PUT
Automatic Data Processing
ADP
$100B
| $4.75M | ﹤0.01% |
16,200
-8,200
| -34% | -$2.47M |
|
1506
Teva Pharmaceuticals
TEVA
$35.9B
| $4.75M | ﹤0.01% |
235,083
+42,093
| +22% | +$739K |
|
1507
PUT
Alpha Metallurgical Resources
AMR
$1.82B
| $4.74M | ﹤0.01% |
28,900
-10,500
| -27% | -$1.46M |
|
|
KOCG
1508
CALL
DELISTED
FIS Knights of Columbus Global Belief ETF
KOCG
| $4.74M | ﹤0.01% |
88,700
+23,600
| +36% | +$738K |
|
1509
CALL
Burlington
BURL
$22B
| $4.73M | ﹤0.01% |
18,600
+15,000
| +417% | +$4.07M |
|
1510
CALL
VanEck Durable High Dividend ETF
DURA
$38.7M
| $4.73M | ﹤0.01% |
39,600
-67,100
| -63% | -$2.25M |
|
1511
CALL
State Street SPDR Portfolio Europe ETF
SPEU
$712M
| $4.72M | ﹤0.01% |
76,700
-1,300
| -2% | -$63.6K |
|
1512
CALL
Canadian National Railway
CNI
$78.3B
| $4.71M | ﹤0.01% |
50,000
-20,500
| -29% | -$1.98M |
|
1513
Chewy
CHWY
$8.54B
| $4.71M | ﹤0.01% |
+116,536
| New | +$4.49M |
|
1514
Mirion Technologies
MIR
$4.05B
| $4.71M | ﹤0.01% |
202,331
+83,382
| +70% | +$1.8M |
|
1515
PUT
Boston Properties
BXP
$11B
| $4.71M | ﹤0.01% |
63,300
-42,900
| -40% | -$3.03M |
|
1516
CALL
Macy's
M
$6.15B
| $4.7M | ﹤0.01% |
262,000
+104,400
| +66% | +$1.48M |
|
1517
CALL
2x Long VIX Futures ETF
UVIX
$286M
| $4.68M | ﹤0.01% |
16,575
+3,235
| +24% | +$969K |
|
|
FLG
1518
Flagstar Bank National Association
FLG
$5.77B
| $4.68M | ﹤0.01% |
405,234
+151,109
| +59% | +$1.8M |
|
1519
PUT
Listed Funds Trust Roundhill Magnificent Seven ETF
MAGS
$3.91B
| $4.67M | ﹤0.01% |
75,400
-93,700
| -55% | -$5.6M |
|
1520
CALL
Applied Optoelectronics
AAOI
$8.04B
| $4.67M | ﹤0.01% |
180,200
+20,800
| +13% | +$532K |
|
1521
PUT
Enbridge
ENB
$124B
| $4.67M | ﹤0.01% |
92,600
+30,700
| +50% | +$1.44M |
|
1522
Archer Aviation
ACHR
$3.64B
| $4.66M | ﹤0.01% |
486,861
+291,947
| +150% | +$2.89M |
|
1523
CALL
Antero Resources
AR
$10.9B
| $4.66M | ﹤0.01% |
138,800
-28,400
| -17% | -$947K |
|
1524
PUT
Tradeweb Markets
TW
$21.3B
| $4.65M | ﹤0.01% |
41,900
+28,700
| +217% | +$3.69M |
|
|
BBBY
1525
PUT
Bed Bath & Beyond
BBBY
$473M
| $4.65M | ﹤0.01% |
522,060
+133,430
| +34% | +$1.1M |
|
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.