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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 | |
|---|---|---|---|---|---|---|---|
1726
PUT
Permian Resources
PR
$18.7B
| $2.6M | ﹤0.01% |
123,200
+51,900
| +73% | +$1.12M |
2020 Q2
25 quarters
|
|
1727
PUT
Hershey
HSY
$35.5B
| $2.6M | ﹤0.01% |
16,500
-3,700
| -18% | -$652K |
2014 Q4
47 quarters
|
|
1728
PUT
OR Royalties Inc
OR
$6.67B
| $2.6M | ﹤0.01% |
75,700
+59,600
| +370% | +$1.99M |
2025 Q3
4 quarters
|
|
1729
PUT
TransDigm Group
TDG
$68.8B
| $2.6M | ﹤0.01% |
2,400
+1,200
| +100% | +$1.44M |
2021 Q1
22 quarters
|
|
1730
Vanguard Information Technology ETF
VGT
$141B
| $2.6M | ﹤0.01% |
20,657
-7,630
| -27% | -$907K |
2026 Q2
1 quarter
|
|
1731
Medpace
MEDP
$18.6B
| $2.6M | ﹤0.01% |
+4,158
| New | +$2.44M |
2026 Q3
0 quarters
|
|
1732
Innodata
INOD
$1.31B
| $2.59M | ﹤0.01% |
39,408
+30,353
| +335% | +$1.88M |
2026 Q1
2 quarters
|
|
1733
PUT
Archer Aviation
ACHR
$3.74B
| $2.59M | ﹤0.01% |
521,200
+82,500
| +19% | +$449K |
2021 Q4
19 quarters
|
|
1734
PUT
Realty Income
O
$56.7B
| $2.59M | ﹤0.01% |
47,700
+2,700
| +6% | +$167K |
2016 Q1
42 quarters
|
|
1735
PUT
Amrize Ltd
AMRZ
$22.2B
| $2.59M | ﹤0.01% |
69,200
+59,500
| +613% | +$2.71M |
2025 Q3
4 quarters
|
|
1736
PUT
ResMed
RMD
$33.6B
| $2.59M | ﹤0.01% |
11,700
-25,600
| -69% | -$5.58M |
2018 Q1
34 quarters
|
|
1737
PUT
HF Sinclair
DINO
$17.2B
| $2.59M | ﹤0.01% |
24,100
+13,800
| +134% | +$1.31M |
2014 Q4
47 quarters
|
|
1738
CALL
Watts Water Technologies
WTS
$12B
| $2.59M | ﹤0.01% |
7,300
+3,900
| +115% | +$1.4M |
2026 Q1
2 quarters
|
|
1739
CALL
Embraer S.A. ADS
EMBJ
$14.7B
| $2.58M | ﹤0.01% |
34,300
+16,400
| +92% | +$1.17M |
2021 Q2
21 quarters
|
|
1740
iShares US Technology ETF
IYW
$23.4B
| $2.58M | ﹤0.01% |
9,743
+8,943
| +1,118% | +$2.23M |
2026 Q1
2 quarters
|
|
1741
CALL
Genuine Parts
GPC
$17.1B
| $2.58M | ﹤0.01% |
20,500
+10,000
| +95% | +$1.3M |
2021 Q1
22 quarters
|
|
1742
CALL
Camtek
CAMT
$5B
| $2.58M | ﹤0.01% |
16,600
+11,700
| +239% | +$1.72M |
2018 Q3
32 quarters
|
|
1743
CALL
Banco Macro
BMA
$3.66B
| $2.58M | ﹤0.01% |
38,500
-1,200
| -3% | -$99K |
2018 Q2
33 quarters
|
|
1744
CALL
Booz Allen Hamilton
BAH
$10.3B
| $2.58M | ﹤0.01% |
37,100
+23,300
| +169% | +$1.68M |
2026 Q1
2 quarters
|
|
1745
CALL
Denison Mines
DNN
$1.98B
| $2.57M | ﹤0.01% |
991,900
+207,200
| +26% | +$639K |
2020 Q4
23 quarters
|
|
1746
Credo Technology Group
CRDO
$26.6B
| $2.57M | ﹤0.01% |
+13,184
| New | +$2.84M |
2026 Q3
0 quarters
|
|
1747
ProShares Ultra VIX Short-Term Futures ETF
UVXY
$160M
| $2.56M | ﹤0.01% |
+148,245
| New | +$3.09M |
2026 Q3
0 quarters
|
|
|
UCD
1748
PUT
DELISTED
PROSHARES ULTRA BLOOMBERG COMMODITY
UCD
| $2.56M | ﹤0.01% |
48,400
+5,500
| +13% | +$291K |
2014 Q4
47 quarters
|
|
1749
Charles Schwab
SCHW
$160B
| $2.55M | ﹤0.01% |
26,127
+8,672
| +50% | +$913K |
2026 Q2
1 quarter
|
|
1750
PUT
Molson Coors Class B
TAP
$7.36B
| $2.55M | ﹤0.01% |
70,000
+36,100
| +106% | +$1.45M |
2014 Q4
47 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.