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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 | |
|---|---|---|---|---|---|---|---|
901
CALL
BioNTech
BNTX
$21.7B
| $7.71M | ﹤0.01% |
78,400
+41,700
| +114% | +$4.05M |
2020 Q2
25 quarters
|
|
902
PUT
Kroger
KR
$41B
| $7.7M | ﹤0.01% |
131,400
+78,300
| +147% | +$4.55M |
2014 Q4
47 quarters
|
|
903
PUT
The Mosaic Company
MOS
$7.25B
| $7.7M | ﹤0.01% |
355,600
-138,600
| -28% | -$3.22M |
2021 Q2
21 quarters
|
|
904
Energy Transfer Partners
ET
$67B
| $7.69M | ﹤0.01% |
389,158
+111,973
| +40% | +$2.31M |
2022 Q4
15 quarters
|
|
905
PayPal
PYPL
$49.4B
| $7.69M | ﹤0.01% |
146,436
+9,520
| +7% | +$524K |
2025 Q3
4 quarters
|
|
906
PUT
Core Scientific
CORZ
$4.69B
| $7.69M | ﹤0.01% |
481,300
-378,400
| -44% | -$7.45M |
2024 Q1
10 quarters
|
|
907
PUT
Centrus Energy
LEU
$2.31B
| $7.67M | ﹤0.01% |
55,000
+15,400
| +39% | +$2.6M |
2020 Q4
23 quarters
|
|
908
CALL
Alcoa
AA
$10.8B
| $7.66M | ﹤0.01% |
182,500
+46,200
| +34% | +$2.2M |
2015 Q1
46 quarters
|
|
909
PUT
Stryker
SYK
$121B
| $7.66M | ﹤0.01% |
27,800
+7,100
| +34% | +$2.24M |
2017 Q3
36 quarters
|
|
910
CALL
Fluor
FLR
$6.49B
| $7.64M | ﹤0.01% |
159,600
+6,000
| +4% | +$313K |
2014 Q4
47 quarters
|
|
911
CALL
Revolution Medicines
RVMD
$39.1B
| $7.62M | ﹤0.01% |
37,100
-18,700
| -34% | -$3.71M |
2023 Q1
14 quarters
|
|
912
CALL
Varonis Systems
VRNS
$5.65B
| $7.59M | ﹤0.01% |
159,900
+143,200
| +857% | +$6.42M |
2017 Q4
35 quarters
|
|
913
CALL
Redwire
RDW
$2.1B
| $7.57M | ﹤0.01% |
724,800
+324,400
| +81% | +$3.5M |
2021 Q4
19 quarters
|
|
914
CALL
Interactive Brokers
IBKR
$37.4B
| $7.54M | ﹤0.01% |
88,300
+10,500
| +13% | +$961K |
2026 Q1
2 quarters
|
|
915
PUT
Toronto Dominion Bank
TD
$203B
| $7.53M | ﹤0.01% |
64,100
+200
| +0.3% | +$24.1K |
2018 Q1
34 quarters
|
|
916
CALL
Cigna
CI
$79.4B
| $7.53M | ﹤0.01% |
27,700
-72,500
| -72% | -$20.4M |
2020 Q1
26 quarters
|
|
917
CALL
FuelCell Energy
FCEL
$875M
| $7.52M | ﹤0.01% |
457,700
+84,300
| +23% | +$1.66M |
2018 Q2
33 quarters
|
|
918
CALL
abrdn Physical Platinum Shares ETF
PPLT
$1.8B
| $7.51M | ﹤0.01% |
487,200
-33,500
| -6% | -$523K |
2025 Q1
6 quarters
|
|
919
PUT
Bitdeer Technologies
BTDR
$1.91B
| $7.5M | ﹤0.01% |
715,000
+343,000
| +92% | +$3.91M |
2024 Q1
10 quarters
|
|
920
CALL
NetApp
NTAP
$36B
| $7.48M | ﹤0.01% |
35,600
-12,900
| -27% | -$2.38M |
2021 Q2
21 quarters
|
|
921
IBM
IBM
$235B
| $7.43M | ﹤0.01% |
33,784
-23,643
| -41% | -$5.61M |
2026 Q2
1 quarter
|
|
922
PUT
Sea Limited
SE
$45.3B
| $7.41M | ﹤0.01% |
76,100
-61,700
| -45% | -$6.77M |
2021 Q1
22 quarters
|
|
923
CALL
Keurig Dr Pepper
KDP
$52.1B
| $7.4M | ﹤0.01% |
243,900
+96,600
| +66% | +$3.02M |
2016 Q1
42 quarters
|
|
924
PUT
Emcor
EME
$29.2B
| $7.39M | ﹤0.01% |
9,800
+9,500
| +3,167% | +$7.32M |
2023 Q3
12 quarters
|
|
925
PUT
NXP Semiconductors
NXPI
$67.9B
| $7.39M | ﹤0.01% |
31,100
+6,500
| +26% | +$1.58M |
2021 Q2
21 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.