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 | |
|---|---|---|---|---|---|---|
976
CALL
Prologis
PLD
$135B
| $9.95M | 0.01% |
86,900
-12,500
| -13% | -$1.37M |
|
977
CALL
Symbotic
SYM
$5.16B
| $9.93M | 0.01% |
184,300
+64,000
| +53% | +$3.23M |
|
978
CALL
Keurig Dr Pepper
KDP
$40.4B
| $9.91M | 0.01% |
388,400
+210,900
| +119% | +$6.61M |
|
979
PUT
AB InBev
BUD
$155B
| $9.89M | 0.01% |
165,900
-4,600
| -3% | -$289K |
|
980
PUT
CF Industries
CF
$19.5B
| $9.88M | 0.01% |
110,200
-129,300
| -54% | -$11.5M |
|
981
PUT
CAVA Group
CAVA
$7.36B
| $9.88M | 0.01% |
163,600
+21,100
| +15% | +$1.6M |
|
982
TeraWulf
WULF
$9.94B
| $9.85M | 0.01% |
862,222
-872
| -0.1% | -$6.66K |
|
983
CALL
SolarEdge
SEDG
$2.75B
| $9.8M | 0.01% |
265,000
-161,700
| -38% | -$4.83M |
|
|
USAR
984
PUT
USA Rare Earth Inc
USAR
$3.7B
| $9.8M | 0.01% |
570,200
+438,400
| +333% | +$6.27M |
|
985
PUT
Colgate-Palmolive
CL
$72.1B
| $9.78M | 0.01% |
122,300
+32,800
| +37% | +$2.8M |
|
986
PUT
Danaher
DHR
$135B
| $9.77M | 0.01% |
49,400
-7,300
| -13% | -$1.45M |
|
987
CALL
Pultegroup
PHM
$23.7B
| $9.76M | 0.01% |
73,900
+27,600
| +60% | +$3.43M |
|
988
CALL
Autodesk
ADSK
$43.3B
| $9.75M | 0.01% |
30,700
-1,900
| -6% | -$579K |
|
989
CALL
Lumentum
LITE
$64.9B
| $9.75M | 0.01% |
59,900
+26,900
| +82% | +$3.35M |
|
990
PUT
TKO Group
TKO
$13.5B
| $9.73M | 0.01% |
48,200
-19,200
| -28% | -$3.51M |
|
991
CALL
Clorox
CLX
$11.3B
| $9.73M | 0.01% |
78,900
-4,300
| -5% | -$534K |
|
992
PUT
Generac Holdings
GNRC
$12.4B
| $9.72M | 0.01% |
58,100
-24,800
| -30% | -$4.34M |
|
993
CALL
Stride
LRN
$3.66B
| $9.72M | 0.01% |
65,300
+49,900
| +324% | +$7.32M |
|
|
JBS
994
CALL
JBS N.V.
JBS
$39.9B
| $9.72M | 0.01% |
651,300
+646,900
| +14,702% | +$9.43M |
|
|
995
PUT
SolarEdge
SEDG
$2.75B
| $9.72M | 0.01% |
262,600
-77,400
| -23% | -$2.31M |
|
996
CALL
HSBC
HSBC
$349B
| $9.71M | 0.01% |
136,800
+62,800
| +85% | +$4.08M |
|
997
PUT
Toll Brothers
TOL
$13.7B
| $9.68M | 0.01% |
70,100
-28,400
| -29% | -$3.71M |
|
998
CALL
Alaska Air
ALK
$4.99B
| $9.67M | 0.01% |
194,200
+118,000
| +155% | +$6.56M |
|
999
PUT
BJs Wholesale Club
BJ
$11.7B
| $9.6M | ﹤0.01% |
103,000
-5,300
| -5% | -$542K |
|
1000
CALL
AMC Entertainment Holdings
AMC
$2.04B
| $9.56M | ﹤0.01% |
3,298,300
+1,075,500
| +48% | +$3.19M |
|
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.