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 | |
|---|---|---|---|---|---|---|
1101
CALL
Match Group
MTCH
$8.72B
| $8.19M | ﹤0.01% |
231,900
-49,700
| -18% | -$1.77M |
|
1102
GraniteShares 2x Long AMD Daily ETF
AMDL
$1.2B
| $8.18M | ﹤0.01% |
791,465
+369,742
| +88% | +$3.94M |
|
1103
CALL
Prudential Financial
PRU
$40.9B
| $8.16M | ﹤0.01% |
78,700
-5,400
| -6% | -$569K |
|
1104
CALL
Chubb
CB
$137B
| $8.13M | ﹤0.01% |
28,800
-200
| -0.7% | -$55K |
|
1105
CALL
Brighthouse Financial
BHF
$3.6B
| $8.11M | ﹤0.01% |
152,800
+104,100
| +214% | +$5.08M |
|
1106
CALL
Aehr Test Systems
AEHR
$2.87B
| $8.11M | ﹤0.01% |
269,200
+6,800
| +3% | +$147K |
|
|
USAR
1107
CALL
USA Rare Earth Inc
USAR
$3.7B
| $8.09M | ﹤0.01% |
470,600
+290,100
| +161% | +$4.15M |
|
1108
PUT
Bath & Body Works
BBWI
$3.9B
| $8.09M | ﹤0.01% |
314,000
+113,500
| +57% | +$3.36M |
|
1109
CALL
Carbon Collective Climate Solutions US Equity ETF
CCSO
$45.8M
| $8.08M | ﹤0.01% |
592,600
+252,200
| +74% | +$6.01M |
|
1110
Pan American Silver
PAAS
$18.6B
| $8.04M | ﹤0.01% |
+207,566
| New | +$6.67M |
|
1111
CALL
Amprius Technologies
AMPX
$1.4B
| $8.04M | ﹤0.01% |
764,100
+561,200
| +277% | +$4.41M |
|
1112
CALL
O'Reilly Automotive
ORLY
$71.4B
| $8.02M | ﹤0.01% |
74,400
+30,600
| +70% | +$3.08M |
|
1113
PUT
Applied Optoelectronics
AAOI
$8.99B
| $8M | ﹤0.01% |
308,400
+253,000
| +457% | +$6.47M |
|
|
LAC
1114
CALL
Lithium Americas
LAC
$1.02B
| $7.98M | ﹤0.01% |
1,397,400
+715,400
| +105% | +$2.26M |
|
1115
CALL
Magnite
MGNI
$2.57B
| $7.97M | ﹤0.01% |
366,100
+94,200
| +35% | +$2.22M |
|
1116
Oscar Health
OSCR
$8.72B
| $7.97M | ﹤0.01% |
420,833
+210,057
| +100% | +$3.46M |
|
|
PONY
1117
PUT
Pony AI Inc
PONY
$3.18B
| $7.92M | ﹤0.01% |
352,300
+65,800
| +23% | +$1M |
|
1118
PUT
Edison International
EIX
$30.6B
| $7.92M | ﹤0.01% |
143,300
+6,300
| +5% | +$340K |
|
1119
CALL
AES
AES
$10.6B
| $7.91M | ﹤0.01% |
601,200
+32,800
| +6% | +$426K |
|
1120
PUT
Campbell Soup
CPB
$6.38B
| $7.91M | ﹤0.01% |
250,500
-16,400
| -6% | -$530K |
|
|
1121
Alphabet (Google) Class C
GOOG
$3.89T
| $7.89M | ﹤0.01% |
32,412
-325,458
| -91% | -$68.4M |
|
1122
PUT
Harley-Davidson
HOG
$2.79B
| $7.88M | ﹤0.01% |
282,300
+97,300
| +53% | +$2.61M |
|
1123
PUT
FTAI Aviation
FTAI
$22.2B
| $7.88M | ﹤0.01% |
47,200
-17,400
| -27% | -$2.47M |
|
1124
CALL
Return Stacked Bonds & Managed Futures ETF
RSBT
$137M
| $7.87M | ﹤0.01% |
685,800
+172,500
| +34% | +$2.85M |
|
1125
PUT
The Mosaic Company
MOS
$7.08B
| $7.86M | ﹤0.01% |
226,600
-423,100
| -65% | -$14.6M |
|
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.