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 | |
|---|---|---|---|---|---|---|
1151
CALL
FuboTV Inc
FUBO
$254M
| $7.62M | ﹤0.01% |
152,925
+56,542
| +59% | +$2.56M |
|
|
FLG
1152
PUT
Flagstar Bank National Association
FLG
$6.13B
| $7.6M | ﹤0.01% |
657,800
+800
| +0.1% | +$9.52K |
|
1153
CALL
CRH
CRH
$65.5B
| $7.57M | ﹤0.01% |
63,100
+37,100
| +143% | +$3.92M |
|
|
PPLT
1154
CALL
abrdn Physical Platinum Shares ETF
PPLT
$1.82B
| $7.51M | ﹤0.01% |
526,000
+222,000
| +73% | +$2.81M |
|
1155
CALL
L3Harris
LHX
$55.8B
| $7.51M | ﹤0.01% |
24,600
-5,600
| -19% | -$1.53M |
|
1156
PUT
Noble Corp
NE
$6.88B
| $7.51M | ﹤0.01% |
266,100
-1,800
| -0.7% | -$51K |
|
|
BLSH
1157
CALL
Bullish
BLSH
$3.68B
| $7.51M | ﹤0.01% |
+118,100
| New | +$7.24M |
|
1158
CALL
ACM Research
ACMR
$6.11B
| $7.5M | ﹤0.01% |
191,800
+162,200
| +548% | +$4.82M |
|
|
XIFR
1159
CALL
XPLR Infrastructure LP
XIFR
$1.18B
| $7.5M | ﹤0.01% |
737,100
+191,900
| +35% | +$1.86M |
|
1160
PUT
Travelers Companies
TRV
$78.5B
| $7.48M | ﹤0.01% |
26,800
+2,000
| +8% | +$536K |
|
1161
CALL
PureCycle Technologies
PCT
$1.21B
| $7.47M | ﹤0.01% |
568,400
-29,500
| -5% | -$410K |
|
1162
PUT
Ralph Lauren
RL
$22.1B
| $7.46M | ﹤0.01% |
23,800
-5,600
| -19% | -$1.67M |
|
1163
Direxion Daily 20+ Year Treasury Bull 3X ETF
TMF
$2.22B
| $7.45M | ﹤0.01% |
185,514
+18,698
| +11% | +$716K |
|
|
1164
PUT
PureCycle Technologies
PCT
$1.21B
| $7.45M | ﹤0.01% |
566,600
-107,800
| -16% | -$1.5M |
|
|
ETH
1165
PUT
Grayscale Ethereum Staking Mini ETF Shares
ETH
$1.71B
| $7.4M | ﹤0.01% |
188,800
+163,300
| +640% | +$6.03M |
|
|
DENT
1166
CALL
DELISTED
AdvisorShares Dent Tactical ETF
DENT
| $7.39M | ﹤0.01% |
1,425,700
+1,037,100
| +267% | +$5.38M |
|
|
QLTB
1167
PUT
DELISTED
ISHARES BAA BA RATED CORP BOND FUND
QLTB
| $7.38M | ﹤0.01% |
28,800
+19,600
| +213% | +$5.03M |
|
1168
PUT
Globalstar
GSAT
$10.2B
| $7.35M | ﹤0.01% |
202,100
+91,900
| +83% | +$2.63M |
|
1169
PUT
Clorox
CLX
$11.3B
| $7.35M | ﹤0.01% |
59,600
+4,700
| +9% | +$583K |
|
1170
PUT
Truist Financial
TFC
$62.5B
| $7.32M | ﹤0.01% |
160,000
-55,100
| -26% | -$2.48M |
|
1171
CALL
B2Gold
BTG
$5.12B
| $7.29M | ﹤0.01% |
1,473,900
+1,035,400
| +236% | +$4.07M |
|
|
PPLC
1172
CALL
DELISTED
PortfolioPlus S&P 500 ETF
PPLC
| $7.29M | ﹤0.01% |
264,400
+144,200
| +120% | +$3.97M |
|
1173
CALL
Alexandria Real Estate Equities
ARE
$8.73B
| $7.28M | ﹤0.01% |
87,300
-11,300
| -11% | -$905K |
|
|
EH
1174
PUT
EHang Holdings
EH
$386M
| $7.27M | ﹤0.01% |
391,400
+138,300
| +55% | +$2.42M |
|
1175
PUT
Teradyne
TER
$58.5B
| $7.27M | ﹤0.01% |
52,800
-82,700
| -61% | -$9.03M |
|
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.