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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 | |
|---|---|---|---|---|---|---|---|
1426
United Airlines
UAL
$38.5B
| $3.6M | ﹤0.01% |
32,475
-11,372
| -26% | -$1.34M |
2026 Q2
1 quarter
|
|
1427
Adobe
ADBE
$92.5B
| $3.6M | ﹤0.01% |
+14,999
| New | +$3.76M |
2026 Q3
0 quarters
|
|
1428
CALL
Summit Therapeutics
SMMT
$13.3B
| $3.6M | ﹤0.01% |
212,800
+135,500
| +175% | +$2.03M |
2022 Q3
16 quarters
|
|
1429
PUT
Fermi Inc
FRMI
$1.16B
| $3.6M | ﹤0.01% |
854,500
+281,800
| +49% | +$1.67M |
2025 Q4
3 quarters
|
|
1430
PUT
Aehr Test Systems
AEHR
$2.16B
| $3.6M | ﹤0.01% |
36,100
-1,400
| -4% | -$128K |
2021 Q4
19 quarters
|
|
1431
PUT
MaxLinear
MXL
$5.44B
| $3.59M | ﹤0.01% |
39,800
-30,300
| -43% | -$2.3M |
2020 Q2
25 quarters
|
|
1432
CALL
Ovintiv
OVV
$17.1B
| $3.59M | ﹤0.01% |
62,100
+56,100
| +935% | +$3.44M |
2020 Q1
26 quarters
|
|
1433
CALL
MKS Inc
MKSI
$15.3B
| $3.58M | ﹤0.01% |
13,500
+12,200
| +938% | +$3.6M |
2016 Q4
39 quarters
|
|
1434
Entegris
ENTG
$23.6B
| $3.58M | ﹤0.01% |
23,225
+9,952
| +75% | +$1.4M |
2025 Q1
6 quarters
|
|
1435
CALL
American International
AIG
$43B
| $3.57M | ﹤0.01% |
48,000
-14,700
| -23% | -$1.14M |
2021 Q2
21 quarters
|
|
1436
PUT
PubMatic
PUBM
$834M
| $3.57M | ﹤0.01% |
190,700
+49,200
| +35% | +$765K |
2021 Q2
21 quarters
|
|
1437
PUT
Fabrinet
FN
$13.2B
| $3.56M | ﹤0.01% |
8,400
-4,000
| -32% | -$1.84M |
2023 Q1
14 quarters
|
|
1438
CME Group
CME
$113B
| $3.56M | ﹤0.01% |
+13,600
| New | +$3.59M |
2026 Q3
0 quarters
|
|
1439
CALL
Novavax
NVAX
$1.65B
| $3.55M | ﹤0.01% |
328,200
+132,900
| +68% | +$1.19M |
2014 Q4
47 quarters
|
|
1440
CALL
Lumen Technologies, Inc. Common Stock
LUMN
$4.59B
| $3.55M | ﹤0.01% |
633,500
-294,100
| -32% | -$1.88M |
2021 Q2
21 quarters
|
|
1441
CALL
Sempra
SRE
$51.2B
| $3.55M | ﹤0.01% |
45,500
+27,600
| +154% | +$2.39M |
2017 Q4
35 quarters
|
|
1442
CALL
TMC The Metals Company
TMC
$1.09B
| $3.55M | ﹤0.01% |
923,600
+240,700
| +35% | +$991K |
2021 Q4
19 quarters
|
|
1443
CALL
C.H. Robinson
CHRW
$15.5B
| $3.52M | ﹤0.01% |
23,800
-3,900
| -14% | -$636K |
2014 Q4
47 quarters
|
|
1444
CALL
Hartford Financial Services
HIG
$36.7B
| $3.51M | ﹤0.01% |
28,700
+20,200
| +238% | +$2.77M |
2026 Q1
2 quarters
|
|
1445
PUT
Nektar Therapeutics
NKTR
$1.31B
| $3.51M | ﹤0.01% |
58,000
-4,100
| -7% | -$288K |
2025 Q1
6 quarters
|
|
1446
Pitney Bowes
PBI
$2.16B
| $3.51M | ﹤0.01% |
215,078
+15,068
| +8% | +$260K |
2025 Q1
6 quarters
|
|
1447
Netflix
NFLX
$265B
| $3.51M | ﹤0.01% |
+50,429
| New | +$3.79M |
2026 Q3
0 quarters
|
|
1448
CALL
FTAI Aviation
FTAI
$19.5B
| $3.51M | ﹤0.01% |
21,000
+6,900
| +49% | +$1.41M |
2021 Q2
21 quarters
|
|
1449
CALL
Macy's
M
$6.49B
| $3.5M | ﹤0.01% |
153,900
-79,800
| -34% | -$1.86M |
2014 Q4
47 quarters
|
|
1450
Take-Two Interactive
TTWO
$43.3B
| $3.5M | ﹤0.01% |
16,877
-23,259
| -58% | -$5.38M |
2026 Q2
1 quarter
|
|
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.