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 | |
|---|---|---|---|---|---|---|
|
DOCU
1126
CALL
DocuSign
DOCU
$8.98B
| $7.82M | ﹤0.01% |
108,500
-1,500
| -1% | -$116K |
|
1127
CALL
Bit Digital
BTBT
$530M
| $7.81M | ﹤0.01% |
2,603,500
+1,613,500
| +163% | +$4.89M |
|
1128
CALL
Northrop Grumman
NOC
$75.8B
| $7.8M | ﹤0.01% |
12,800
-7,800
| -38% | -$4.42M |
|
1129
CALL
Alnylam Pharmaceuticals
ALNY
$35.9B
| $7.8M | ﹤0.01% |
17,100
+3,400
| +25% | +$1.38M |
|
1130
PUT
Cadence Design Systems
CDNS
$91.1B
| $7.8M | ﹤0.01% |
22,200
-5,400
| -20% | -$1.86M |
|
|
CFLT
1131
PUT
DELISTED
Confluent
CFLT
| $7.8M | ﹤0.01% |
393,800
+227,400
| +137% | +$4.76M |
|
1132
PUT
Stellantis
STLA
$16.7B
| $7.78M | ﹤0.01% |
833,400
+223,600
| +37% | +$2.14M |
|
|
NBIS
1133
Nebius Group N.V.
NBIS
$56.1B
| $7.78M | ﹤0.01% |
69,267
+14,384
| +26% | +$999K |
|
1134
CALL
LyondellBasell Industries
LYB
$19.9B
| $7.76M | ﹤0.01% |
158,300
-30,000
| -16% | -$1.69M |
|
1135
CALL
Diamondback Energy
FANG
$57.8B
| $7.76M | ﹤0.01% |
54,200
-6,700
| -11% | -$954K |
|
|
JBS
1136
PUT
JBS N.V.
JBS
$39.9B
| $7.75M | ﹤0.01% |
519,000
+490,000
| +1,690% | +$7.15M |
|
1137
CALL
Banc of California
BANC
$3.3B
| $7.75M | ﹤0.01% |
468,100
+458,400
| +4,726% | +$7.18M |
|
1138
PUT
Mobileye
MBLY
$6.29B
| $7.73M | ﹤0.01% |
547,600
+216,500
| +65% | +$3.22M |
|
1139
CALL
Crown Castle
CCI
$32.6B
| $7.73M | ﹤0.01% |
80,100
-178,300
| -69% | -$18M |
|
1140
PUT
Simon Property Group
SPG
$73B
| $7.71M | ﹤0.01% |
41,100
-44,900
| -52% | -$7.75M |
|
1141
CALL
United Therapeutics
UTHR
$26.4B
| $7.71M | ﹤0.01% |
18,400
+4,200
| +30% | +$1.41M |
|
1142
PUT
UiPath
PATH
$5.28B
| $7.71M | ﹤0.01% |
576,200
+90,600
| +19% | +$1.07M |
|
1143
PUT
FirstEnergy
FE
$28.6B
| $7.71M | ﹤0.01% |
168,200
+75,800
| +82% | +$3.24M |
|
1144
PUT
Conagra Brands
CAG
$6.88B
| $7.7M | ﹤0.01% |
420,700
+133,300
| +46% | +$2.56M |
|
1145
CALL
Carrier Global
CARR
$57.4B
| $7.65M | ﹤0.01% |
128,100
+51,100
| +66% | +$3.47M |
|
1146
CALL
Barclays
BCS
$93.3B
| $7.63M | ﹤0.01% |
369,400
-223,000
| -38% | -$4.41M |
|
1147
CALL
Marriott International
MAR
$96.1B
| $7.63M | ﹤0.01% |
29,300
-18,300
| -38% | -$4.91M |
|
1148
CALL
Novartis
NVS
$297B
| $7.63M | ﹤0.01% |
59,500
-11,400
| -16% | -$1.39M |
|
1149
CALL
Vanguard Emerging Markets Government Bond ETF
VWOB
$6.14B
| $7.63M | ﹤0.01% |
54,700
+21,500
| +65% | +$1.42M |
|
1150
Futu Holdings
FUTU
$13.9B
| $7.63M | ﹤0.01% |
43,852
+13,179
| +43% | +$2.19M |
|
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.