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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 | |
|---|---|---|---|---|---|---|---|
976
PUT
TTM Technologies
TTMI
$8.29B
| $6.87M | ﹤0.01% |
55,900
+50,800
| +996% | +$6.52M |
2025 Q2
5 quarters
|
|
977
PUT
NuScale Power
SMR
$2.15B
| $6.86M | ﹤0.01% |
868,100
+284,300
| +49% | +$2.55M |
2022 Q2
17 quarters
|
|
978
CALL
Agilent Technologies
A
$49.9B
| $6.84M | ﹤0.01% |
39,700
-7,600
| -16% | -$1.12M |
2014 Q4
47 quarters
|
|
979
PUT
Ferrari
RACE
$72.9B
| $6.84M | ﹤0.01% |
17,400
-8,000
| -31% | -$3.2M |
2015 Q4
43 quarters
|
|
980
CALL
Nutrien
NTR
$34B
| $6.84M | ﹤0.01% |
97,300
-21,700
| -18% | -$1.55M |
2018 Q1
34 quarters
|
|
981
Nike
NKE
$56.9B
| $6.8M | ﹤0.01% |
191,951
-141,524
| -42% | -$5.68M |
2023 Q1
14 quarters
|
|
982
CALL
Ouster
OUST
$2.79B
| $6.78M | ﹤0.01% |
168,100
+69,000
| +70% | +$2.74M |
2021 Q1
22 quarters
|
|
983
TeraWulf
WULF
$6.7B
| $6.78M | ﹤0.01% |
457,926
+302,798
| +195% | +$5.3M |
2023 Q4
11 quarters
|
|
984
CALL
NextNav
NN
$1.43B
| $6.78M | ﹤0.01% |
471,300
+151,700
| +47% | +$2.33M |
2023 Q3
12 quarters
|
|
985
CALL
Iovance Biotherapeutics
IOVA
$3.74B
| $6.76M | ﹤0.01% |
456,000
+137,000
| +43% | +$980K |
2021 Q2
21 quarters
|
|
986
Nu Holdings
NU
$59.5B
| $6.75M | ﹤0.01% |
+532,962
| New | +$7.56M |
2026 Q3
0 quarters
|
|
987
PUT
VanEck Durable High Dividend ETF
DURA
$38.7M
| $6.75M | ﹤0.01% |
41,900
-8,900
| -18% | -$346K |
2018 Q4
31 quarters
|
|
988
CALL
FedEx
FDX
$75.6B
| $6.71M | ﹤0.01% |
28,100
-2,300
| -8% | -$723K |
2021 Q2
21 quarters
|
|
989
PUT
Kimberly-Clark
KMB
$66.8B
| $6.69M | ﹤0.01% |
68,700
-14,100
| -17% | -$1.51M |
2014 Q4
47 quarters
|
|
990
PUT
Factset
FDS
$11.8B
| $6.67M | ﹤0.01% |
24,700
+19,700
| +394% | +$5.42M |
2025 Q2
5 quarters
|
|
|
991
CALL
TTM Technologies
TTMI
$8.29B
| $6.65M | ﹤0.01% |
54,100
+33,800
| +167% | +$4.34M |
2020 Q1
26 quarters
|
|
992
CALL
GDS Holdings
GDS
$4.53B
| $6.64M | ﹤0.01% |
212,700
+89,100
| +72% | +$2.87M |
2018 Q2
33 quarters
|
|
993
CALL
Figure Technology Solutions
FIGR
$5.43B
| $6.64M | ﹤0.01% |
230,100
-10,800
| -4% | -$351K |
2025 Q3
4 quarters
|
|
994
CALL
State Street SPDR S&P MIDCAP 400 ETF Trust
MDY
$26.7B
| $6.63M | ﹤0.01% |
10,100
-6,100
| -38% | -$4.2M |
2015 Q1
46 quarters
|
|
995
PUT
Zeta Global
ZETA
$9.47B
| $6.63M | ﹤0.01% |
209,900
-140,100
| -40% | -$3.72M |
2024 Q1
10 quarters
|
|
996
PUT
TripAdvisor
TRIP
$880M
| $6.63M | ﹤0.01% |
791,600
+519,400
| +191% | +$5.88M |
2014 Q4
47 quarters
|
|
997
Vale
VALE
$49.3B
| $6.62M | ﹤0.01% |
493,473
+276,439
| +127% | +$4.02M |
2025 Q4
3 quarters
|
|
998
PUT
Marriott International
MAR
$111B
| $6.62M | ﹤0.01% |
18,600
+100
| +0.5% | +$35.6K |
2014 Q4
47 quarters
|
|
999
CALL
Logitech
LOGI
$14.2B
| $6.61M | ﹤0.01% |
65,500
-35,500
| -35% | -$3.6M |
2021 Q2
21 quarters
|
|
1000
Fortinet
FTNT
$94.1B
| $6.59M | ﹤0.01% |
36,879
-22,155
| -38% | -$3.59M |
2025 Q4
3 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.