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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 | |
|---|---|---|---|---|---|---|---|
3176
ADMA Biologics
ADMA
$2.94B
| $684K | ﹤0.01% |
68,227
+40,351
| +145% | +$373K |
2026 Q1
2 quarters
|
|
3177
Eldorado Gold
EGO
$8.31B
| $684K | ﹤0.01% |
+17,772
| New | +$673K |
2026 Q3
0 quarters
|
|
3178
CALL
Zimmer Biomet
ZBH
$19.8B
| $684K | ﹤0.01% |
7,700
+6,000
| +353% | +$568K |
2021 Q2
21 quarters
|
|
3179
CALL
MACOM Technology Solutions
MTSI
$18.8B
| $684K | ﹤0.01% |
2,400
-8,200
| -77% | -$2.3M |
2026 Q1
2 quarters
|
|
3180
CALL
Autoliv
ALV
$8.56B
| $683K | ﹤0.01% |
6,100
-15,000
| -71% | -$1.8M |
2019 Q1
30 quarters
|
|
3181
CALL
Richtech Robotics
RR
$184M
| $681K | ﹤0.01% |
431,000
+12,400
| +3% | +$20.9K |
2025 Q3
4 quarters
|
|
3182
Itaú Unibanco
ITUB
$81.2B
| $680K | ﹤0.01% |
+79,695
| New | +$643K |
2026 Q3
0 quarters
|
|
3183
PUT
Allegro MicroSystems
ALGM
$5.91B
| $680K | ﹤0.01% |
18,700
+10,000
| +115% | +$419K |
2021 Q1
22 quarters
|
|
3184
CALL
Rezolute
RZLT
$374M
| $679K | ﹤0.01% |
164,100
-68,100
| -29% | -$313K |
2024 Q2
9 quarters
|
|
3185
Ferrari
RACE
$71.1B
| $679K | ﹤0.01% |
1,729
-1,364
| -44% | -$546K |
2025 Q4
3 quarters
|
|
3186
Main Street Capital
MAIN
$5.28B
| $679K | ﹤0.01% |
+12,333
| New | +$690K |
2026 Q3
0 quarters
|
|
3187
Lifestance Health
LFST
$5.38B
| $678K | ﹤0.01% |
56,386
+2,631
| +5% | +$31K |
2026 Q1
2 quarters
|
|
3188
PUT
Glacier Bancorp
GBCI
$6.27B
| $678K | ﹤0.01% |
15,700
+500
| +3% | +$24.2K |
2026 Q2
1 quarter
|
|
3189
PUT
Imperial Petroleum
IMPP
$202M
| $678K | ﹤0.01% |
132,700
+1,600
| +1% | +$8.05K |
2022 Q1
18 quarters
|
|
3190
CALL
Starwood Property Trust
STWD
$4.16B
| $678K | ﹤0.01% |
50,200
-13,100
| -21% | -$209K |
2018 Q2
33 quarters
|
|
3191
PUT
Rackspace Technology
RXT
$792M
| $678K | ﹤0.01% |
181,900
-367,300
| -67% | -$1.51M |
2024 Q1
10 quarters
|
|
3192
Flywire
FLYW
$2.67B
| $676K | ﹤0.01% |
38,653
+36,429
| +1,638% | +$650K |
2025 Q1
6 quarters
|
|
3193
CALL
Hesai Group
HSAI
$2.23B
| $676K | ﹤0.01% |
42,400
-19,700
| -32% | -$335K |
2023 Q4
11 quarters
|
|
3194
Celsius Holdings
CELH
$7.99B
| $675K | ﹤0.01% |
24,695
-3,221
| -12% | -$95.6K |
2026 Q2
1 quarter
|
|
3195
CALL
Douglas Emmett
DEI
$1.65B
| $675K | ﹤0.01% |
70,500
+34,300
| +95% | +$394K |
2022 Q4
15 quarters
|
|
3196
PUT
Public Service Enterprise Group
PEG
$37.3B
| $673K | ﹤0.01% |
10,000
+600
| +6% | +$45K |
2026 Q1
2 quarters
|
|
3197
CALL
Coty
COTY
$3.55B
| $673K | ﹤0.01% |
258,000
+187,600
| +266% | +$497K |
2016 Q3
40 quarters
|
|
3198
Invesco DB US Dollar Index Bearish Fund
UDN
$92.4M
| $673K | ﹤0.01% |
37,633
+25,033
| +199% | +$453K |
2026 Q1
2 quarters
|
|
3199
CALL
Zebra Technologies
ZBRA
$15B
| $672K | ﹤0.01% |
1,800
+500
| +38% | +$164K |
2026 Q1
2 quarters
|
|
3200
CALL
Trulieve Cannabis Corp
TRLV
$1.9B
| $671K | ﹤0.01% |
+61,600
| New | +$626K |
2026 Q3
0 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.