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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 | |
|---|---|---|---|---|---|---|---|
1251
CALL
Powell Industries
POWL
$5.32B
| $4.65M | ﹤0.01% |
25,200
+3,000
| +14% | +$616K |
2022 Q2
17 quarters
|
|
1252
CALL
Danaos Corp
DAC
$2.75B
| $4.63M | ﹤0.01% |
30,000
+14,900
| +99% | +$2.15M |
2020 Q4
23 quarters
|
|
1253
PUT
HubSpot
HUBS
$9.9B
| $4.61M | ﹤0.01% |
22,500
+2,900
| +15% | +$654K |
2021 Q2
21 quarters
|
|
1254
PUT
Alamos Gold
AGI
$12.6B
| $4.61M | ﹤0.01% |
142,300
+123,400
| +653% | +$4.07M |
2019 Q1
30 quarters
|
|
1255
CALL
ArcelorMittal
MT
$49.8B
| $4.57M | ﹤0.01% |
68,500
-12,000
| -15% | -$850K |
2015 Q4
43 quarters
|
|
1256
PUT
Flagstar Bank National Association
FLG
$4.16B
| $4.57M | ﹤0.01% |
391,700
-30,600
| -7% | -$421K |
2026 Q1
2 quarters
|
|
1257
PUT
Dave Inc
DAVE
$3.61B
| $4.57M | ﹤0.01% |
14,200
+9,700
| +216% | +$3.6M |
2024 Q4
7 quarters
|
|
1258
PUT
Talen Energy Corp
TLN
$16.5B
| $4.57M | ﹤0.01% |
14,600
| – | – |
2024 Q3
8 quarters
|
|
1259
PUT
Avis
CAR
$4.5B
| $4.54M | ﹤0.01% |
42,600
-81,900
| -66% | -$11.5M |
2021 Q2
21 quarters
|
|
1260
CALL
D.R. Horton
DHI
$40B
| $4.54M | ﹤0.01% |
33,200
+1,400
| +4% | +$204K |
2014 Q4
47 quarters
|
|
1261
CALL
Sweetgreen
SG
$1.54B
| $4.53M | ﹤0.01% |
511,100
-104,800
| -17% | -$724K |
2021 Q4
19 quarters
|
|
1262
PUT
AMC Entertainment Holdings
AMC
$3.05B
| $4.53M | ﹤0.01% |
1,509,600
+1,023,300
| +210% | +$2.55M |
2021 Q2
21 quarters
|
|
1263
PUT
Sibanye-Stillwater
SBSW
$6.51B
| $4.52M | ﹤0.01% |
442,500
+103,900
| +31% | +$1.08M |
2019 Q1
30 quarters
|
|
1264
CALL
Plug Power
PLUG
$1.89B
| $4.51M | ﹤0.01% |
2,326,100
-709,900
| -23% | -$1.54M |
2018 Q2
33 quarters
|
|
|
HONA
1265
PUT
Honeywell Aerospace
HONA
$53.7B
| $4.51M | ﹤0.01% |
+29,100
| New | +$5.29M |
2026 Q3
0 quarters
|
|
1266
CALL
Ares Management
ARES
$31.4B
| $4.51M | ﹤0.01% |
38,800
-35,300
| -48% | -$4.61M |
2017 Q4
35 quarters
|
|
1267
PUT
Flutter Entertainment
FLUT
$14.8B
| $4.49M | ﹤0.01% |
60,300
+25,000
| +71% | +$2.48M |
2024 Q2
9 quarters
|
|
1268
Mercado Libre
MELI
$76.7B
| $4.49M | ﹤0.01% |
2,595
-652
| -20% | -$1.21M |
2024 Q4
7 quarters
|
|
1269
PUT
Campbell Soup
CPB
$6.65B
| $4.47M | ﹤0.01% |
225,600
+36,200
| +19% | +$803K |
2014 Q4
47 quarters
|
|
1270
CALL
Wendy's
WEN
$1.59B
| $4.46M | ﹤0.01% |
699,700
-223,800
| -24% | -$1.73M |
2015 Q4
43 quarters
|
|
1271
Iovance Biotherapeutics
IOVA
$3.74B
| $4.46M | ﹤0.01% |
300,685
+174,578
| +138% | +$1.25M |
2023 Q1
14 quarters
|
|
1272
CALL
Solaris Energy Infrastructure
SEI
$4.5B
| $4.46M | ﹤0.01% |
62,600
+12,000
| +24% | +$731K |
2023 Q2
13 quarters
|
|
1273
PUT
Progressive
PGR
$135B
| $4.44M | ﹤0.01% |
21,400
+11,100
| +108% | +$2.4M |
2021 Q2
21 quarters
|
|
1274
CALL
Franco-Nevada
FNV
$48B
| $4.43M | ﹤0.01% |
18,600
+5,700
| +44% | +$1.36M |
2021 Q2
21 quarters
|
|
1275
CALL
Star Bulk Carriers
SBLK
$3.25B
| $4.43M | ﹤0.01% |
150,800
+102,600
| +213% | +$2.97M |
2018 Q1
34 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.