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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 | |
|---|---|---|---|---|---|---|---|
3651
PUT
Bio-Techne
TECH
$11.4B
| $464K | ﹤0.01% |
6,400
-35,700
| -85% | -$2.57M |
2021 Q1
22 quarters
|
|
3652
CALL
Amdocs
DOX
$4.65B
| $463K | ﹤0.01% |
8,100
-6,100
| -43% | -$350K |
2023 Q4
11 quarters
|
|
3653
CALL
Jazz Pharmaceuticals
JAZZ
$15.3B
| $463K | ﹤0.01% |
2,000
+800
| +67% | +$198K |
2015 Q1
46 quarters
|
|
3654
TransDigm Group
TDG
$66.8B
| $462K | ﹤0.01% |
427
+235
| +122% | +$282K |
2026 Q2
1 quarter
|
|
3655
CALL
Pebblebrook Hotel Trust
PEB
$2.42B
| $461K | ﹤0.01% |
24,600
| – | – |
2025 Q4
3 quarters
|
|
3656
PUT
Saratoga Investment
SAR
$181M
| $461K | ﹤0.01% |
+27,700
| New | +$517K |
2026 Q3
0 quarters
|
|
3657
PUT
NovaGold Resources
NG
$2.45B
| $461K | ﹤0.01% |
70,900
+59,900
| +545% | +$425K |
2024 Q2
9 quarters
|
|
3658
CALL
Fortrea Holdings
FTRE
$1.89B
| $461K | ﹤0.01% |
23,100
+22,600
| +4,520% | +$419K |
2023 Q3
12 quarters
|
|
3659
Carpenter Technology
CRS
$14.1B
| $461K | ﹤0.01% |
+1,185
| New | +$602K |
2026 Q3
0 quarters
|
|
3660
PUT
Helen of Troy
HELE
$873M
| $460K | ﹤0.01% |
16,800
-16,500
| -50% | -$466K |
2022 Q3
16 quarters
|
|
3661
CALL
EPR Properties
EPR
$4.54B
| $460K | ﹤0.01% |
8,200
+3,500
| +74% | +$210K |
2018 Q1
34 quarters
|
|
3662
PUT
Uranium Royalty Corp
UROY
$1.06B
| $460K | ﹤0.01% |
113,900
+26,400
| +30% | +$99K |
2021 Q4
19 quarters
|
|
3663
PUT
Avnet
AVT
$6.76B
| $460K | ﹤0.01% |
+4,600
| New | +$420K |
2026 Q3
0 quarters
|
|
3664
GraniteShares 2x Long INTC Daily ETF
INTW
$106M
| $460K | ﹤0.01% |
14,698
-5,295
| -26% | -$131K |
2026 Q1
2 quarters
|
|
3665
CALL
Evolus
EOLS
$455M
| $459K | ﹤0.01% |
57,400
+53,300
| +1,300% | +$399K |
2025 Q3
4 quarters
|
|
3666
PUT
Viant Technology
DSP
$233M
| $459K | ﹤0.01% |
+37,300
| New | +$465K |
2026 Q3
0 quarters
|
|
3667
PUT
PPG Industries
PPG
$27.1B
| $459K | ﹤0.01% |
4,400
-100
| -2% | -$11.3K |
2016 Q2
41 quarters
|
|
3668
CALL
iShares S&P GSCI Commodity-Indexed Trust
GSG
$990M
| $459K | ﹤0.01% |
12,900
-700
| -5% | -$23.2K |
2020 Q2
25 quarters
|
|
3669
CALL
Nuvectis Pharma
NVCT
$688M
| $458K | ﹤0.01% |
21,700
+20,100
| +1,256% | +$424K |
2025 Q1
6 quarters
|
|
3670
AbCellera Biologics
ABCL
$3.62B
| $458K | ﹤0.01% |
31,395
+11,895
| +61% | +$113K |
2026 Q1
2 quarters
|
|
3671
B2Gold
BTG
$6.53B
| $458K | ﹤0.01% |
87,740
-18,623
| -18% | -$88.6K |
2023 Q3
12 quarters
|
|
3672
PUT
NB Bancorp
NBBK
$958M
| $458K | ﹤0.01% |
20,700
+18,900
| +1,050% | +$421K |
2026 Q2
1 quarter
|
|
3673
Unicycive Therapeutics
UNCY
$98.6M
| $457K | ﹤0.01% |
97,386
+56,964
| +141% | +$295K |
2026 Q1
2 quarters
|
|
3674
PUT
IAMGOLD
IAG
$9.8B
| $457K | ﹤0.01% |
24,800
-46,900
| -65% | -$838K |
2018 Q2
33 quarters
|
|
3675
PUT
Mercury Systems
MRCY
$4.92B
| $456K | ﹤0.01% |
5,500
+3,200
| +139% | +$309K |
2025 Q3
4 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.