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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 | |
|---|---|---|---|---|---|---|---|
951
PUT
Axsome Therapeutics
AXSM
$7.85B
| $7.08M | ﹤0.01% |
38,400
-3,100
| -7% | -$674K |
2021 Q1
22 quarters
|
|
952
PUT
Simon Property Group
SPG
$75.7B
| $7.07M | ﹤0.01% |
35,200
-16,300
| -32% | -$3.55M |
2021 Q2
21 quarters
|
|
953
PUT
Edison International
EIX
$23.1B
| $7.06M | ﹤0.01% |
131,400
+104,200
| +383% | +$7.06M |
2015 Q4
43 quarters
|
|
954
PUT
Rocket Companies
RKT
$41B
| $7.02M | ﹤0.01% |
610,300
+273,900
| +81% | +$3.75M |
2020 Q3
24 quarters
|
|
955
PUT
Royal Bank of Canada
RY
$282B
| $7M | ﹤0.01% |
35,600
+21,800
| +158% | +$4.54M |
2017 Q4
35 quarters
|
|
956
PUT
Caesars Entertainment
CZR
$5.97B
| $6.99M | ﹤0.01% |
235,900
+14,200
| +6% | +$423K |
2026 Q1
2 quarters
|
|
957
PUT
Entegris
ENTG
$23.6B
| $6.98M | ﹤0.01% |
45,300
+32,800
| +262% | +$4.62M |
2018 Q2
33 quarters
|
|
958
PUT
Chubb
CB
$141B
| $6.96M | ﹤0.01% |
21,400
+4,600
| +27% | +$1.59M |
2021 Q2
21 quarters
|
|
959
CALL
Elevance Health
ELV
$92.8B
| $6.96M | ﹤0.01% |
17,900
+6,600
| +58% | +$2.63M |
2026 Q1
2 quarters
|
|
960
CALL
Invesco DB US Dollar Index Bullish Fund
UUP
$487M
| $6.95M | ﹤0.01% |
273,300
-12,900
| -5% | -$365K |
2018 Q2
33 quarters
|
|
961
PUT
CSX Corp
CSX
$95.7B
| $6.94M | ﹤0.01% |
149,300
+60,300
| +68% | +$2.99M |
2021 Q2
21 quarters
|
|
962
PUT
Live Nation Entertainment
LYV
$42.5B
| $6.94M | ﹤0.01% |
41,000
-34,000
| -45% | -$6.07M |
2026 Q1
2 quarters
|
|
963
CALL
Planet Labs
PL
$5.22B
| $6.94M | ﹤0.01% |
423,300
+149,500
| +55% | +$3.2M |
2021 Q4
19 quarters
|
|
964
CALL
Bunge Global
BG
$19.3B
| $6.93M | ﹤0.01% |
64,800
+4,500
| +7% | +$515K |
2014 Q4
47 quarters
|
|
965
CALL
Keel Infrastructure Corp
KEEL
$1.28B
| $6.92M | ﹤0.01% |
1,959,400
+523,000
| +36% | +$2.01M |
2021 Q4
19 quarters
|
|
966
PUT
Automatic Data Processing
ADP
$121B
| $6.92M | ﹤0.01% |
26,800
+4,400
| +20% | +$1.17M |
2026 Q1
2 quarters
|
|
967
Hewlett Packard
HPE
$66.7B
| $6.91M | ﹤0.01% |
108,209
+76,539
| +242% | +$4.05M |
2026 Q2
1 quarter
|
|
968
PUT
Prologis
PLD
$124B
| $6.91M | ﹤0.01% |
53,200
+12,400
| +30% | +$1.74M |
2021 Q1
22 quarters
|
|
969
PUT
American Eagle Outfitters
AEO
$3.61B
| $6.89M | ﹤0.01% |
387,600
+188,600
| +95% | +$3.16M |
2026 Q1
2 quarters
|
|
970
PUT
VF Corp
VFC
$8.12B
| $6.89M | ﹤0.01% |
489,800
-15,300
| -3% | -$227K |
2014 Q4
47 quarters
|
|
971
CALL
AeroVironment
AVAV
$6.32B
| $6.88M | ﹤0.01% |
48,400
-26,700
| -36% | -$4.21M |
2016 Q4
39 quarters
|
|
972
CALL
Parker-Hannifin
PH
$123B
| $6.88M | ﹤0.01% |
7,200
-1,300
| -15% | -$1.28M |
2016 Q1
42 quarters
|
|
973
CALL
Equinix
EQIX
$106B
| $6.88M | ﹤0.01% |
6,800
+5,700
| +518% | +$5.92M |
2016 Q1
42 quarters
|
|
974
PUT
HCA Healthcare
HCA
$106B
| $6.87M | ﹤0.01% |
16,100
+6,400
| +66% | +$2.62M |
2014 Q4
47 quarters
|
|
975
CALL
Flagstar Bank National Association
FLG
$4.16B
| $6.87M | ﹤0.01% |
588,500
+178,400
| +44% | +$2.46M |
2026 Q1
2 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.