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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 | |
|---|---|---|---|---|---|---|---|
1051
CALL
HF Sinclair
DINO
$17.2B
| $6.11M | ﹤0.01% |
56,900
+17,000
| +43% | +$1.61M |
2014 Q4
47 quarters
|
|
1052
CALL
Elastic
ESTC
$9.17B
| $6.1M | ﹤0.01% |
66,500
+16,400
| +33% | +$1.26M |
2018 Q4
31 quarters
|
|
1053
PUT
DELISTED
FIS Knights of Columbus Global Belief ETF
KOCG
| $6.09M | ﹤0.01% |
123,700
+58,000
| +88% | +$2.85M |
2024 Q2
9 quarters
|
|
1054
Duolingo
DUOL
$7.74B
| $6.06M | ﹤0.01% |
42,575
-10,545
| -20% | -$1.46M |
2026 Q1
2 quarters
|
|
1055
PUT
Macy's
M
$6.49B
| $6.06M | ﹤0.01% |
266,200
+128,900
| +94% | +$3M |
2014 Q4
47 quarters
|
|
1056
CALL
Southern Copper
SCCO
$147B
| $6.06M | ﹤0.01% |
30,217
-15,806
| -34% | -$2.99M |
2015 Q4
43 quarters
|
|
1057
CALL
Sony
SONY
$154B
| $6.04M | ﹤0.01% |
267,800
-25,900
| -9% | -$594K |
2014 Q4
47 quarters
|
|
1058
CALL
Vicor
VICR
$7.76B
| $6.04M | ﹤0.01% |
20,900
+10,800
| +107% | +$2.45M |
2018 Q1
34 quarters
|
|
1059
CALL
Caesars Entertainment
CZR
$5.97B
| $6.04M | ﹤0.01% |
203,600
-83,800
| -29% | -$2.5M |
2026 Q1
2 quarters
|
|
1060
PUT
GlobalFoundries
GFS
$23.9B
| $6.03M | ﹤0.01% |
125,900
-12,900
| -9% | -$672K |
2021 Q4
19 quarters
|
|
1061
CALL
Cboe Global Markets
CBOE
$38.5B
| $6.03M | ﹤0.01% |
21,900
+6,400
| +41% | +$1.81M |
2021 Q2
21 quarters
|
|
1062
CALL
Peloton Interactive
PTON
$2.55B
| $6.02M | ﹤0.01% |
1,207,000
+459,400
| +61% | +$2.57M |
2019 Q4
27 quarters
|
|
1063
CALL
Joby Aviation
JOBY
$5.98B
| $6.02M | ﹤0.01% |
995,100
+241,400
| +32% | +$1.75M |
2021 Q4
19 quarters
|
|
1064
PUT
LyondellBasell Industries
LYB
$20.2B
| $5.98M | ﹤0.01% |
104,100
+36,600
| +54% | +$2.24M |
2015 Q1
46 quarters
|
|
1065
PUT
MSCI
MSCI
$48.1B
| $5.98M | ﹤0.01% |
11,100
+2,900
| +35% | +$1.66M |
2018 Q2
33 quarters
|
|
1066
CALL
YPF Sociedad Anonima ADS
YPF
$14.6B
| $5.97M | ﹤0.01% |
119,100
-29,400
| -20% | -$1.5M |
2014 Q4
47 quarters
|
|
1067
CALL
Sherwin-Williams
SHW
$85.9B
| $5.95M | ﹤0.01% |
18,400
+7,700
| +72% | +$2.6M |
2014 Q4
47 quarters
|
|
1068
PUT
Welltower
WELL
$181B
| $5.94M | ﹤0.01% |
25,800
+500
| +2% | +$118K |
2014 Q4
47 quarters
|
|
1069
PUT
Trump Media & Technology Group
DJT
$1.45B
| $5.92M | ﹤0.01% |
653,600
-93,200
| -12% | -$849K |
2026 Q1
2 quarters
|
|
1070
CALL
Qiagen
QGEN
$10.4B
| $5.92M | ﹤0.01% |
135,300
+129,200
| +2,118% | +$5.48M |
2025 Q1
6 quarters
|
|
1071
CALL
Nano Nuclear Energy
NNE
$622M
| $5.91M | ﹤0.01% |
373,100
+267,500
| +253% | +$4.74M |
2024 Q4
7 quarters
|
|
1072
PUT
Eos Energy Enterprises
EOSE
$729M
| $5.88M | ﹤0.01% |
1,918,700
+201,600
| +12% | +$784K |
2020 Q4
23 quarters
|
|
1073
PUT
C3.ai
AI
$1.96B
| $5.88M | ﹤0.01% |
535,000
+272,800
| +104% | +$2.69M |
2020 Q4
23 quarters
|
|
1074
CALL
Amer Sports
AS
$18.1B
| $5.87M | ﹤0.01% |
215,000
+171,900
| +399% | +$5.51M |
2024 Q3
8 quarters
|
|
1075
CALL
Liquidia Corp
LQDA
$4.94B
| $5.85M | ﹤0.01% |
193,300
+92,200
| +91% | +$6.94M |
2020 Q4
23 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.