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 | |
|---|---|---|---|---|---|---|
1901
CALL
PPG Industries
PPG
$25.9B
| $3.09M | ﹤0.01% |
29,400
-6,100
| -17% | -$678K |
|
1902
CALL
FMC
FMC
$1.42B
| $3.08M | ﹤0.01% |
91,700
+3,800
| +4% | +$148K |
|
1903
PUT
HF Sinclair
DINO
$15.9B
| $3.08M | ﹤0.01% |
58,900
-47,300
| -45% | -$2.24M |
|
1904
GSK
GSK
$103B
| $3.08M | ﹤0.01% |
71,404
-64,191
| -47% | -$2.51M |
|
|
1905
PUT
PPG Industries
PPG
$25.9B
| $3.08M | ﹤0.01% |
29,300
-1,200
| -4% | -$133K |
|
|
CWAN
1906
CALL
DELISTED
Clearwater Analytics
CWAN
| $3.08M | ﹤0.01% |
170,700
+80,900
| +90% | +$1.64M |
|
|
JBGS
1907
PUT
JBG SMITH
JBGS
$846M
| $3.07M | ﹤0.01% |
138,200
+2,500
| +2% | +$51.5K |
|
1908
Robinhood
HOOD
$85.2B
| $3.07M | ﹤0.01% |
21,447
-279,662
| -93% | -$30.5M |
|
1909
PUT
W.W. Grainger
GWW
$65.3B
| $3.05M | ﹤0.01% |
3,200
-2,200
| -41% | -$2.21M |
|
1910
McCormick & Company Non-Voting
MKC
$13.4B
| $3.05M | ﹤0.01% |
45,527
+30,800
| +209% | +$2.16M |
|
|
JMIA
1911
Jumia Technologies
JMIA
$726M
| $3.04M | ﹤0.01% |
261,948
+219,760
| +521% | +$1.61M |
|
|
BRR
1912
PUT
ProCap Financial Inc
BRR
$161M
| $3.04M | ﹤0.01% |
+300,500
| New | +$3.09M |
|
1913
S&P Global
SPGI
$126B
| $3.04M | ﹤0.01% |
+6,245
| New | +$3.34M |
|
1914
PUT
Yum China
YUMC
$14.9B
| $3.04M | ﹤0.01% |
70,800
-27,100
| -28% | -$1.23M |
|
1915
PUT
AMC Entertainment Holdings
AMC
$2.03B
| $3.03M | ﹤0.01% |
1,043,900
+555,000
| +114% | +$1.65M |
|
1916
CALL
Matador Resources
MTDR
$6.31B
| $3.02M | ﹤0.01% |
67,200
-48,500
| -42% | -$2.37M |
|
1917
CALL
indie Semiconductor
INDI
$733M
| $3.01M | ﹤0.01% |
740,200
+64,400
| +10% | +$265K |
|
1918
PUT
STMicroelectronics
STM
$46B
| $3.01M | ﹤0.01% |
106,600
-73,800
| -41% | -$2.06M |
|
1919
PUT
Bread Financial
BFH
$4.21B
| $3.01M | ﹤0.01% |
54,000
+49,000
| +980% | +$3.02M |
|
|
ARR
1920
Armour Residential REIT
ARR
$2.02B
| $3.01M | ﹤0.01% |
201,402
+153,631
| +322% | +$2.41M |
|
|
WAY
1921
CALL
Waystar Holding Corp
WAY
$4.32B
| $3.01M | ﹤0.01% |
79,300
+38,700
| +95% | +$1.43M |
|
1922
CALL
Hudbay
HBM
$9.92B
| $3.01M | ﹤0.01% |
198,300
+900
| +0.5% | +$10.3K |
|
1923
Cedar Fair
FUN
$1.78B
| $3M | ﹤0.01% |
132,216
+128,185
| +3,180% | +$3.4M |
|
1924
CALL
Avery Dennison
AVY
$12.3B
| $3M | ﹤0.01% |
+18,500
| New | +$3.19M |
|
1925
PUT
Maplebear
CART
$9.92B
| $3M | ﹤0.01% |
81,500
+36,000
| +79% | +$1.66M |
|
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.