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Simplex Trading Portfolio holdings
AUM
$184B
Turnover
28.44%
1-Year Est. Return
51.71%
Simplex Trading is a market maker that trades for its own account, mainly in US stock options and options on futures, using software it builds itself. Its work pairs software developers with data-driven traders. It was founded in Chicago in 2004, and Erik Swanson, who joined straight out of college as a trader, has been its chief executive since 2014. It also invests in early-stage financial and technology start-ups.
This Fund
S&P 500
This Quarter Est. Return
-0.22%
1 Year Est. Return
+51.71%
3 Year Est. Return
+194.66%
5 Year Est. Return
+164.83%
10 Year Est. Return
+968.67%
AUM
$184B
AUM Growth
+$13.3B
(+7.8%)
Cap. Flow
-$519M
Cap. Flow % of AUM
Cap. Flow %
-0.28%
Top 10 Holdings %
Top 10 Hldgs %
50.68%
Holding
10,644
New
1,493
Increased
3,697
Reduced
3,633
Closed
1,534
Avg Time Held
Equity + Options
3
years
Top 10 Avg Time Held
Equity + Options
3.9
years
Top 20 Avg Time Held
Equity + Options
4.3
years
Avg Time Held Equity only
0.5
years
Top 10 Avg Time Held Equity only
0.5
years
Top 20 Avg Time Held Equity only
0.4
years
Top Buys
| Rank | Stock | Value |
|---|---|---|
| 1 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$92.6M |
| 2 |
iShares iBoxx $ High Yield Corporate Bond ETF
HYG
|
+$80.6M |
| 3 |
Amazon
AMZN
|
+$26.3M |
| 4 |
State Street Industrial Select Sector SPDR ETF
XLI
|
+$25.7M |
| 5 |
SPDR Gold Trust
GLD
|
+$20.7M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Alphabet (Google) Class A
GOOGL
|
+$128M |
| 2 |
NVIDIA
NVDA
|
+$97.8M |
| 3 |
Tesla
TSLA
|
+$53.9M |
| 4 |
Micron Technology
MU
|
+$50M |
| 5 |
United States Oil Fund
USO
|
+$49.2M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Miscellaneous | 98.84% |
| 2 | Technology | 0.45% |
| 3 | Consumer Discretionary | 0.14% |
| 4 | Healthcare | 0.14% |
| 5 | Financials | 0.1% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | Held Since | |
|---|---|---|---|---|---|---|---|
1126
PUT
Elevance Health
ELV
$92.8B
| $5.44M | ﹤0.01% |
14,000
-3,200
| -19% | -$1.28M |
2026 Q1
2 quarters
|
|
1127
CALL
Chewy
CHWY
$9.3B
| $5.43M | ﹤0.01% |
298,300
+13,400
| +5% | +$292K |
2019 Q2
29 quarters
|
|
1128
PUT
Sharplink Inc
SBET
$1.31B
| $5.42M | ﹤0.01% |
583,800
-122,000
| -17% | -$890K |
2025 Q2
5 quarters
|
|
1129
PUT
Upstart Holdings
UPST
$2.03B
| $5.41M | ﹤0.01% |
235,400
+68,200
| +41% | +$1.95M |
2021 Q1
22 quarters
|
|
1130
CALL
Copart
CPRT
$29.8B
| $5.41M | ﹤0.01% |
198,200
-51,000
| -20% | -$1.53M |
2019 Q1
30 quarters
|
|
1131
Intel
INTC
$332B
| $5.4M | ﹤0.01% |
+44,933
| New | +$4.58M |
2026 Q3
0 quarters
|
|
1132
PUT
Fair Isaac
FICO
$15.6B
| $5.39M | ﹤0.01% |
9,100
-1,600
| -15% | -$1.75M |
2017 Q4
35 quarters
|
|
1133
Cipher Digital
CIFR
$3.24B
| $5.39M | ﹤0.01% |
340,692
+197,998
| +139% | +$3.68M |
2022 Q3
16 quarters
|
|
1134
PUT
MKS Inc
MKSI
$15.3B
| $5.39M | ﹤0.01% |
20,300
+18,000
| +783% | +$5.32M |
2017 Q1
38 quarters
|
|
1135
CALL
Steel Dynamics
STLD
$34B
| $5.39M | ﹤0.01% |
24,300
-25,700
| -51% | -$6.18M |
2014 Q4
47 quarters
|
|
1136
PUT
Coeur Mining
CDE
$15.4B
| $5.38M | ﹤0.01% |
305,900
+61,300
| +25% | +$1.11M |
2021 Q2
21 quarters
|
|
1137
PUT
Dollar Tree
DLTR
$26.8B
| $5.38M | ﹤0.01% |
47,200
-10,800
| -19% | -$1.34M |
2021 Q1
22 quarters
|
|
1138
Snap
SNAP
$9.22B
| $5.35M | ﹤0.01% |
990,013
+135,444
| +16% | +$700K |
2025 Q1
6 quarters
|
|
1139
CALL
LyondellBasell Industries
LYB
$20.2B
| $5.34M | ﹤0.01% |
93,000
+23,500
| +34% | +$1.44M |
2015 Q1
46 quarters
|
|
1140
CALL
Liberty Media Corporation Series A Common Stock
FWONA
$27B
| $5.34M | ﹤0.01% |
57,800
+35,000
| +154% | +$3.17M |
2025 Q4
3 quarters
|
|
1141
CALL
dLocal
DLO
$4B
| $5.33M | ﹤0.01% |
387,700
-136,500
| -26% | -$2M |
2021 Q2
21 quarters
|
|
1142
State Street SPDR S&P Regional Banking ETF
KRE
$4.73B
| $5.33M | ﹤0.01% |
76,792
-62,496
| -45% | -$4.67M |
2026 Q2
1 quarter
|
|
1143
PUT
Energy Fuels
UUUU
$1.84B
| $5.33M | ﹤0.01% |
483,400
+89,700
| +23% | +$1.18M |
2019 Q2
29 quarters
|
|
1144
CALL
2x Long VIX Futures ETF
UVIX
$131M
| $5.31M | ﹤0.01% |
167,700
+140,265
| +511% | +$6.78M |
2022 Q2
17 quarters
|
|
1145
PUT
Generac Holdings
GNRC
$11.4B
| $5.3M | ﹤0.01% |
25,600
+12,800
| +100% | +$2.66M |
2018 Q2
33 quarters
|
|
1146
CALL
monday.com
MNDY
$3.28B
| $5.3M | ﹤0.01% |
67,500
+11,900
| +21% | +$1.03M |
2021 Q2
21 quarters
|
|
1147
PUT
X-Energy Inc
XE
$3.14B
| $5.29M | ﹤0.01% |
373,000
+319,100
| +592% | +$5.49M |
2026 Q2
1 quarter
|
|
1148
CALL
BWX Technologies
BWXT
$11.5B
| $5.29M | ﹤0.01% |
38,600
+22,900
| +146% | +$3.74M |
2019 Q1
30 quarters
|
|
1149
CALL
Replimune Group
REPL
$2.06B
| $5.29M | ﹤0.01% |
399,400
+91,800
| +30% | +$1.16M |
2022 Q2
17 quarters
|
|
1150
CALL
Southwest Airlines
LUV
$22.8B
| $5.28M | ﹤0.01% |
126,900
-64,100
| -34% | -$2.81M |
2014 Q4
47 quarters
|
|
Similar funds
Simplex Trading's Q3 2026 Portfolio in Review
As of Q3 2026, Simplex Trading held 10,644 positions worth $184B, up 7.8% from $171B the previous quarter. Its ten largest holdings account for 51% of the portfolio.
Simplex Trading's Q3 2026 filing shows 1,493 new, 3,697 increased, 3,633 reduced and 1,534 closed positions. Its largest new stake was iShares iBoxx $ High Yield Corporate Bond ETF: 1,017,542 shares worth $78.6M. The largest sale was Alphabet (Google) Class A, an estimated $128M.
By sector, the portfolio is most concentrated in Miscellaneous at 99% of assets, up from 98% a quarter earlier, followed by Technology and Consumer Discretionary.
- Simplex Trading's largest Q3 2026 buy was iShares iBoxx $ High Yield Corporate Bond ETF: 1,017,542 shares worth $78.6M.
- Simplex Trading added most to iShares 20+ Year Treasury Bond ETF in Q3 2026, an estimated $92.6M increase.
- Simplex Trading's biggest Q3 2026 reduction was NVIDIA, cutting an estimated $97.8M.
- Simplex Trading fully exited Alphabet (Google) Class A in Q3 2026, selling an estimated $128M.
- Simplex Trading's ten largest holdings make up 51% of its $184B portfolio in Q3 2026.
- Simplex Trading opened 1,493 new positions and closed 1,534 in Q3 2026.
- Simplex Trading's portfolio value rose 7.8% quarter-over-quarter to $184B.
Based on Simplex Trading's 13F filing for Q3 2026, filed 4 Nov 2026.