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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 | |
|---|---|---|---|---|---|---|---|
876
EchoStar
ECHO
$29.7B
| $8.08M | ﹤0.01% |
+90,396
| New | +$8.22M |
2026 Q3
0 quarters
|
|
877
Dow Inc
DOW
$23.6B
| $8.03M | ﹤0.01% |
291,602
-51,782
| -15% | -$1.54M |
2025 Q2
5 quarters
|
|
878
CALL
Flex
FLEX
$29.2B
| $8.03M | ﹤0.01% |
73,000
+13,200
| +22% | +$1.56M |
2016 Q3
40 quarters
|
|
879
CALL
Kodiak Sciences
KOD
$6.87B
| $8.01M | ﹤0.01% |
84,500
+74,200
| +720% | +$3.06M |
2019 Q4
27 quarters
|
|
880
CALL
Fidelity Ethereum Fund
FETH
$1.12B
| $7.99M | ﹤0.01% |
300,700
-115,500
| -28% | -$2.49M |
2025 Q2
5 quarters
|
|
881
CALL
GRAIL Inc
GRAL
$5.65B
| $7.99M | ﹤0.01% |
57,000
+29,100
| +104% | +$2.31M |
2024 Q3
8 quarters
|
|
882
CALL
ProShares Ultra S&P500
SSO
$7.42B
| $7.98M | ﹤0.01% |
93,300
-109,900
| -54% | -$7.6M |
2014 Q4
47 quarters
|
|
883
PUT
Teva Pharmaceutical Industries Limited
TEVA
$50.5B
| $7.98M | ﹤0.01% |
201,400
+19,800
| +11% | +$708K |
2026 Q1
2 quarters
|
|
884
CALL
Frontline
FRO
$10.1B
| $7.97M | ﹤0.01% |
161,700
+10,800
| +7% | +$460K |
2018 Q2
33 quarters
|
|
885
PUT
AB InBev
BUD
$166B
| $7.96M | ﹤0.01% |
108,400
+8,500
| +9% | +$680K |
2020 Q3
24 quarters
|
|
886
CALL
Las Vegas Sands
LVS
$26.1B
| $7.94M | ﹤0.01% |
210,000
+71,700
| +52% | +$3.2M |
2021 Q2
21 quarters
|
|
887
Akamai
AKAM
$12.5B
| $7.9M | ﹤0.01% |
74,328
+9,053
| +14% | +$1.03M |
2025 Q2
5 quarters
|
|
888
PUT
Canadian Natural Resources
CNQ
$99.5B
| $7.9M | ﹤0.01% |
167,900
+2,400
| +1% | +$113K |
2021 Q2
21 quarters
|
|
889
PUT
AGNC Investment
AGNC
$10.8B
| $7.9M | ﹤0.01% |
870,500
+353,800
| +68% | +$3.76M |
2014 Q4
47 quarters
|
|
890
CALL
KE Holdings
BEKE
$19.7B
| $7.89M | ﹤0.01% |
468,400
+328,600
| +235% | +$5.51M |
2020 Q3
24 quarters
|
|
891
CALL
Kimberly-Clark
KMB
$66.8B
| $7.88M | ﹤0.01% |
80,900
+3,100
| +4% | +$331K |
2014 Q4
47 quarters
|
|
892
PUT
e.l.f. Beauty
ELF
$7.01B
| $7.86M | ﹤0.01% |
77,800
+36,900
| +90% | +$3.37M |
2017 Q3
36 quarters
|
|
893
CALL
W.W. Grainger
GWW
$69.6B
| $7.85M | ﹤0.01% |
6,300
-5,000
| -44% | -$6.6M |
2014 Q4
47 quarters
|
|
894
CALL
Matador Resources
MTDR
$6.44B
| $7.85M | ﹤0.01% |
152,100
+89,700
| +144% | +$4.84M |
2015 Q4
43 quarters
|
|
895
CALL
UBS Group
UBS
$150B
| $7.77M | ﹤0.01% |
161,500
+92,900
| +135% | +$4.88M |
2017 Q4
35 quarters
|
|
896
PUT
Wheaton Precious Metals
WPM
$61.6B
| $7.76M | ﹤0.01% |
58,000
-10,500
| -15% | -$1.39M |
2026 Q1
2 quarters
|
|
897
CALL
Waste Management
WM
$95.5B
| $7.75M | ﹤0.01% |
38,000
+10,500
| +38% | +$2.35M |
2014 Q4
47 quarters
|
|
898
PUT
SAP
SAP
$270B
| $7.73M | ﹤0.01% |
37,100
-14,000
| -27% | -$2.72M |
2016 Q2
41 quarters
|
|
899
CALL
Truist Financial
TFC
$60.2B
| $7.73M | ﹤0.01% |
166,900
-37,000
| -18% | -$1.88M |
2015 Q1
46 quarters
|
|
900
PUT
Invesco S&P SmallCap Low Volatility ETF
XSLV
$240M
| $7.72M | ﹤0.01% |
198,200
-386,800
| -66% | -$20.3M |
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.