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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 | |
|---|---|---|---|---|---|---|---|
3876
PUT
Eastman Chemical
EMN
$7.38B
| $383K | ﹤0.01% |
5,900
+1,600
| +37% | +$112K |
2014 Q4
47 quarters
|
|
3877
PubMatic
PUBM
$918M
| $382K | ﹤0.01% |
20,420
-38,631
| -65% | -$601K |
2025 Q4
3 quarters
|
|
3878
Future Fuel
FF
$130M
| $382K | ﹤0.01% |
74,755
+35,504
| +90% | +$183K |
2025 Q4
3 quarters
|
|
3879
PUT
Edgewise Therapeutics
EWTX
$4.89B
| $382K | ﹤0.01% |
9,400
+8,800
| +1,467% | +$374K |
2024 Q2
9 quarters
|
|
3880
Aaon
AAON
$6.56B
| $382K | ﹤0.01% |
4,611
+2,276
| +97% | +$205K |
2026 Q1
2 quarters
|
|
3881
AdvisorShares Psychedelics ETF
PSIL
$40.9M
| $381K | ﹤0.01% |
16,955
+4,246
| +33% | +$104K |
2026 Q2
1 quarter
|
|
3882
PUT
Dakota Gold
DC
$706M
| $381K | ﹤0.01% |
62,600
-7,300
| -10% | -$40.2K |
2025 Q1
6 quarters
|
|
3883
NewMarket
NEU
$6.49B
| $381K | ﹤0.01% |
424
+109
| +35% | +$94K |
2026 Q2
1 quarter
|
|
3884
Oxford Industries
OXM
$423M
| $380K | ﹤0.01% |
15,547
+14,245
| +1,094% | +$499K |
2026 Q1
2 quarters
|
|
3885
Bitwise XRP ETF
XRP
$230M
| $380K | ﹤0.01% |
22,833
+17,818
| +355% | +$245K |
2026 Q1
2 quarters
|
|
3886
CALL
Concentrix
CNXC
$1.97B
| $379K | ﹤0.01% |
15,200
+5,700
| +60% | +$149K |
2020 Q4
23 quarters
|
|
3887
United States Gasoline Fund
UGA
$141M
| $379K | ﹤0.01% |
2,585
-51
| -2% | -$6.37K |
2024 Q4
7 quarters
|
|
3888
Disc Medicine
IRON
$3.64B
| $379K | ﹤0.01% |
+5,789
| New | +$437K |
2026 Q3
0 quarters
|
|
3889
CALL
Arbe Robotics
ARBE
$56.4M
| $379K | ﹤0.01% |
610,800
+5,700
| +0.9% | +$4.06K |
2024 Q1
10 quarters
|
|
3890
PUT
SM Energy
SM
$7.66B
| $378K | ﹤0.01% |
11,200
-4,400
| -28% | -$147K |
2021 Q2
21 quarters
|
|
3891
PUT
Ascent Industries
ACNT
$121M
| $378K | ﹤0.01% |
26,800
| – | – |
2026 Q1
2 quarters
|
|
3892
Churchill Downs
CHDN
$6.86B
| $378K | ﹤0.01% |
4,990
-4,395
| -47% | -$376K |
2025 Q1
6 quarters
|
|
3893
CALL
ProPetro Holding
PUMP
$896M
| $377K | ﹤0.01% |
42,700
-13,500
| -24% | -$154K |
2024 Q1
10 quarters
|
|
3894
PUT
Black Stone Minerals
BSM
$3.03B
| $377K | ﹤0.01% |
26,300
+14,200
| +117% | +$207K |
2018 Q3
32 quarters
|
|
3895
PUT
DeFi Development Corp
DFDV
$93M
| $376K | ﹤0.01% |
208,300
+14,300
| +7% | +$57.2K |
2025 Q2
5 quarters
|
|
3896
CALL
Rayonier
RYN
$6.24B
| $376K | ﹤0.01% |
20,500
+800
| +4% | +$16.7K |
2015 Q4
43 quarters
|
|
3897
PUT
Hyliion Holdings
HYLN
$440M
| $376K | ﹤0.01% |
90,200
+59,700
| +196% | +$231K |
2023 Q4
11 quarters
|
|
3898
CALL
W&T Offshore
WTI
$510M
| $376K | ﹤0.01% |
105,300
-81,500
| -44% | -$297K |
2021 Q2
21 quarters
|
|
3899
CALL
NIQ Global Intelligence PLC
NIQ
$5.54B
| $376K | ﹤0.01% |
22,100
+21,900
| +10,950% | +$329K |
2025 Q4
3 quarters
|
|
3900
Sportradar
SRAD
$3.85B
| $376K | ﹤0.01% |
32,512
-63,011
| -66% | -$857K |
2025 Q4
3 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.